Background and activities

Biography

Odd Sture Hopperstad is professor at Department of Structural EngineeringNorwegian University of Science and Engineering (NTNU) in Trondheim, Norway. He earned his doctoral degree at the Norwegian Institute of Technology (NTH) in 1993 and for this work he received the ESSO prize for best doctoral degree in fundamental research. He was appointed professor at NTNU in 1998. He is a member of the Norwegian Academy of Technological Sciences and the Royal Norwegian Society of Sciences and Letters. Professor Hopperstad’s research activities are mainly within materials mechanics, ductile fracture, formability, crashworthiness and structural impact. Within these fields, Hopperstad has authored/co-authored about 200 articles in international journals with peer review. He has supervised/co-supervised 36 PhD students in the past and is currently supervising/co-supervising 15 PhD students. From 2007-2014, he was member of the core team of the Centre of Research-based Innovation SIMLab at NTNU, where he was heading the research area Fracture and Crack Propagation. Currently he is Research Director of the Centre of Research-based Innovation CASA and principal investigator of the Toppforsk project FractAl at NTNU. From 2008-2011, Hopperstad was Associate Editor in International Journal of Impact Engineering, and he is currently member of the Editorial Advisory Board of the journal. From fall 2010, he is Associate Editor in European Journal of Mechanics – A/Solids.

  

Publications

2016

D. Vysochinskiy, T. Coudert, O.S. Hopperstad, O.G. Lademo, A. Reyes. Experimental detection of forming limit strains on samples with multiple local necks. Journal of Materials Processing Technology 227 (2016) 216–226.

M. Khadyko, S. Dumoulin, G. Cailletaud, O.S. Hopperstad. Latent hardening and plastic anisotropy evolution in AA6060 aluminium alloy.  International Journal of Plasticity 76 (2016) 51–74.

J.K. Holmen, J. Johnsen, O.S. Hopperstad, T. Børvik. Influence of fragmentation upon the capacity of aluminum alloy plates subjected to ballistic impact. European Journal of Mechanics A/Solids 55 (2016) 221–233.

G. Gruben, M. Langseth, E. Fagerholt, O.S. Hopperstad. Low-velocity impact on high-strength steel sheets: an experimental and numerical study. International Journal of Impact Engineering 88 (2016) 153–171.

T. Børvik, L.A. Marken, M. Langseth, O.S. Hopperstad, G. Rørvik. Influence of sigma-phase precipitation on the impact behaviour of duplex stainless steel pipe fittings. Ships and Offshore Structures 11 (2016) 25–37.

I. Westermann, K.O. Pedersen, T. Børvik, O.S. Hopperstad. Work-hardening and ductility of artificially aged AA6060 aluminium alloy. Mechanics of Materials 97 (2016) 100–117.

M. Kristoffersen, T. Børvik, M. Langseth, O.S. Hopperstad. Dynamic versus quasi-static loading of X65 offshore steel pipes. European Physics Journal: Special Topics 225 (2016) 325-334.

M. Khadyko, O.R. Myhr, S. Dumoulin, O.S. Hopperstad. A microstructure based yield and work-hardening model for textured 6xxx aluminium alloys. Philosophical Magazine Volume 96 (2016) 1047-1072.

L.E. Bryhni Dæhli, T. Børvik, O.S. Hopperstad. Influence of loading path on ductile fracture of tensile specimens made from aluminium alloys. International Journal of Solids and Structures 88-89 (2016) 17-34.

V. Vilamosa, A.H. Clausen, T. Børvik, B. Holmedal, O.S. Hopperstad. A physically-based constitutive model applied to AA6082 aluminium alloy at large strains, high strain rates and elevated temperatures. Materials and Design 103 (2016) 391–405.

H. Moe-Føre, P.F. Lader, E. Lien, O.S. Hopperstad. Structural response of high solidity net cage models in uniform flow. Journal of Fluids and Structures 65 (2016) 180–195.

M. Kristoffersen, T. Børvik, O.S. Hopperstad. Using unit cell simulations to investigate fracture due to compression–tension loading. Engineering Fracture Mechanics 162 (2016) 269–289.

J. Johnsen, F. Grytten, O.S. Hopperstad, A.H. Clausen. Experimental set-up for determination of the large-strain tensile behaviour of polymers at low temperatures. Polymer Testing 53 (2016) 305–313.

J.K. Holmen, L.E.B. Dæhli, O.S. Hopperstad, T. Børvik. Prediction of ductile failure using a phenomenological model calibrated from micromechanical simulations. Procedia Structural Integrity 2 (2016) 2543–2549.

M. Khadyko, S. Dumoulin, O.S. Hopperstad. Texture gradients and strain localisation in extruded aluminium profile. International Journal of Solids and Structures 97–98 (2016) 239–255.

M. Khadyko, C.D. Marioara, I.G. Ringdalen, S. Dumoulin, O.S. Hopperstad. Deformation and strain localization in polycrystals with plastically heterogeneous grains. International Journal of Plasticity 86 (2016) 128–150.

2015        

H. Fransplass, M. Langseth, O.S. Hopperstad. Experimental and numerical study of threaded steel fasteners under combined tension and shear at elevated loading rates. International Journal of Impact Engineering 76 (2015) 118–125.

K.O. Pedersen, I. Westermann, T. Furu, T. Børvik, O.S. Hopperstad. Influence of microstructure on work-hardening and ductile fracture of aluminium alloys. Materials and Design 70 (2015) 31–44.

J.K. Holmen, O.S. Hopperstad, T. Børvik. Low-velocity impact on multi-layered dual-phase steel plates. International Journal of Impact Engineering 78 (2015) 161–177.

K. Zhang, B. Holmedal, O.S. Hopperstad, S. Dumoulin, J. Gawad, A. Van Bael, P. Van Houtte. Multi-level modelling of mechanical anisotropy of commercial pure aluminium plate: Crystal plasticity models, advanced yield functions and parameter identification. International Journal of Plasticity 66 (2015) 3–30.

T. Mánik, B. Holmedal, O.S. Hopperstad. Strain-path change induced transients in flow stress, work hardening and r-values in aluminum. International Journal of Plasticity 69 (2015) 1–20.

N.-H. Hoang, O.S. Hopperstad, O.R. Myhr, M. Langseth, C. Marioara. Multi-scale simulation of square hollow section aluminium profiles under axial crushing. Thin-Walled Structures 92 (2015) 93–103.

 A. Saai, I. Westermann, S. Dumoulin, O.S. Hopperstad. Crystal plasticity finite element simulations of pure bending of aluminium alloy AA7108. International Journal of Material Forming, DOI 10.1007/s12289-015-1233-z, 2015.

M. Storheim, H.S. Alsos, O.S. Hopperstad, J. Amdahl. A damage-based failure model for coarsely meshed shell structures. International Journal of Impact Engineering 83 (2015) 59–75.

M. Fourmeau, C.D. Marioara, T. Børvik, A. Benallal, O.S. Hopperstad. A study of the influence of precipitate free zones on the strain localization and failure of the aluminium alloy AA7075-T651. Philosophical Magazine 95 (2015) 3278–3304.

M. Khadyko, S. Dumoulin, T. Børvik, O.S. Hopperstad. Simulation of large-strain behaviour of aluminium alloy under tensile loading using anisotropic plasticity models. Computers and Structures 157 (2015) 60–75.

J.K. Holmen, T. Børvik, O.R. Myhr, H.G. Fjær, O.S. Hopperstad. Perforation of welded aluminum components: microstructure-based modelling and experimental validation. International Journal of Impact Engineering 84 (2015) 96–107.

 V. Vilamosa, A.H. Clausen, T. Børvik, O.S. Hopperstad. Behaviour of Al-Mg-Si aluminium alloys under a wide range of temperatures and strain rates. International Journal of Impact Engineering 86 (2015) 223–239.

J.K. Holmen, T. Børvik, O.R. Myhr, O.S. Hopperstad. Perforation of welded aluminum extrusions: Numerical prediction and experimental validation.  EPJ Web of Conferences 94 (2015) 04015.

V. Vilamosa, T. Børvik, O.S. Hopperstad, A.H. Clausen. Behaviour and modelling of aluminium alloy AA6060 subjected to a wide range of strain rates and temperatures. EPJ Web of Conferences 94 (2015) 04018.

M. Storheim, H. Alsos, O.S. Hopperstad, J. Amdahl. An extension of the BWH instability criterion - Numerical study. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering – OMAE (2015) 41178.

M. Kristoffersen, T. Børvik, M. Langseth, O.S. Hopperstad. X65 steel pipes subjected to combined stretching and bending. MARINE 2015 - Computational Methods in Marine Engineering VI, pp. 1004-1014, 2015.

2014

K.G. Rakvåg, T. Børvik. O.S. Hopperstad. A numerical study on the deformation and fracture modes of steel projectiles during impact. International Journal of Solids and Structures, 51 (2014) 808–821.

A.S. Ognedal, A. Clausen, T. Berstad, T. Seelig, O.S. Hopperstad. Void nucleation and growth in a mineral filled PVC – an experimental and numerical study. International Journal of Solids and Structures 51 (2014) 1494–1506.

A.S. Ognedal, A.H. Clausen, A. Dahlen, O.S. Hopperstad. Behavior of PVC and HDPE under highly triaxial stress states: An experimental and numerical study. Mechanics of Materials 72 (2014) 94–108.

M. Kristoffersen, F. Casadei, T. Børvik, M. Langseth, O.S. Hopperstad. Impact against open and closed water-filled X65 steel pipes – Experiments and simulations. International Journal of Impact Engineering 71 (2014) 73–88.

M. Khadyko, S. Dumoulin, T. Børvik, O.S. Hopperstad. An experimental-numerical method to determine the work-hardening of anisotropic ductile materials at large strains. International Journal of Mechanical Sciences 88 (2014) 25–36.

V. Vilamosa, A.H. Clausen, E. Fagerholt, O.S. Hopperstad, T. Børvik. Extended measurement of stress-strain behaviour of ductile materials at elevated temperatures in a split-Hopkinson tension bar system. Strain 50 (2014) 223–235.

K. Zhang, O.S. Hopperstad, B. Holmedal, S. Dumoulin. A robust and efficient substepping scheme for the explicit numerical integration of a rate-dependent crystal plasticity model. International Journal for Numerical Methods in Engineering 99 (2014) 239–262.

M. Vautrot, P. Balland, O.S. Hopperstad, L. Tabourot, J. Raujol-Veillé, F. Toussaint. Experimental technique to characterize the plastic behaviour of metallic materials in a wide range of temperatures and strain rates: application to a high-carbon steel. Experimental Mechanics 54 (2014) 1163–1175

K. Zhang, B. Holmedal, S. Dumoulin, O.S. Hopperstad. An explicit integration scheme for hypo-elastic viscoplastic crystal plasticity. Transactions of Nonferrous Metals Society of China 24 (2014) 2401−2407.

I. Westermann, K.O. Pedersen, T. Børvik, O.S. Hopperstad. Effects of particles and solutes on the strength, work-hardening and ductile fracture of aluminium alloys. Mechanics of Materials 79 (2014) 58–72.

K. Zhang, B. Holmedal, O.S. Hopperstad, S. Dumoulin. Modelling the plastic anisotropy of aluminium alloy 3103 sheets by polycrystal plasticity models. Modelling and Simulation in Materials Science and Engineering 22 (2014) 075015 (20pp)

Ø. Fyllingen, M. Langseth, O.S. Hopperstad. Investigation of high-strength steel component subjected to stretch-bending: effect of forming history. Key Engineering Materials 611–612 (2014) 1702–1709.

O.S. Hopperstad, I. Westermann, K.O. Pedersen, T. Furu, T. Børvik. Influence of processing route on the work-hardening and ductile fracture of an AA6060 aluminium alloy. Materials Science Forum Vols. 794-796 (2014) pp 284-289.

V. Vilamosa, A.H. Clausen, O.S. Hopperstad, T. Børvik, S.R. Skjervold. Influence of temperature and strain rate on the mechanical behaviour of aluminium alloy AA6060. Materials Science Forum Vols. 794-796 (2014) pp 520-525.

I. Westermann, O.S. Hopperstad, M. Langseth. Mechanical behaviour of an AA6082 aluminium alloy at low temperatures. Materials Science Forum Vols. 794-796 (2014) pp 532-537.

D. Vysochinskiy, T. Coudert, O.S. Hopperstad, O.-G. Lademo, A. Reyes. Experimental detection of the onset of local necking in an aluminium sheet. Materials Science Forum Vols. 794-796 (2014) pp 590-595.

M. Khadyko, S. Dumoulin, O.S. Hopperstad. Slip system interaction matrix and its influence on the macroscopic response of Al alloys. Materials Science Forum Vols. 794-796 (2014) pp 566-571.

A. Saai, O.S. Hopperstad, S. Dumoulin, L. Tabourot. Numerical study on the influence of crystallographic texture and grain shape on the yield surface of textured aluminum sheet material. Materials Science Forum Vols. 794-796 (2014) pp 584-589.

K. Zhang, B. Holmedal, O.S. Hopperstad, S. Dumoulin.  Use of plane-strain tension and shear tests to evaluate yield surfaces for AA1050 aluminium sheet. Materials Science Forum Vols. 794-796 (2014) pp 596-601.

O.S. Hopperstad, T. Børvik, M. Fourmeau, K.O. Pedersen, A. Benallal. Quasi-static and dynamic fracture of high-strength aluminium alloy. Procedia Materials Science 3 (2014) 51–56.

G. Gruben, E. Fagerholt, O.S. Hopperstad, T. Børvik, M. Langseth. Numerical simulation of ductile fracture in modified Arcan test. Procedia Materials Science 3 (2014) 661–666.

A. Saai, O.S. Hopperstad, Y. Granbom, O.-G. Lademo. Influence of volume fraction and distribution of martensite phase on the strain localization in dual phase steels. Procedia Materials Science 3 (2014) 900–905.

2013

H.N.G. Wadley, T. Børvik, L. Olovsson, J.J. Wetzel, K.P. Dharmasena, O.S. Hopperstad, V.S. Deshpande and J. Hutchinson. Deformation and Fracture of Impulsively Loaded Sandwich Panels. Journal of the Physics and Mechanics of Solids 61 (2013) 674–699.

E. Fagerholt, T. Børvik and O.S. Hopperstad. Measuring discontinuous displacement fields in cracked specimens using Digital Image Correlation with mesh adaptation and crack-path optimization. Optics and Lasers in Engineering 51 (2013) 299–310.

A. Saai, S. Dumoulin, O.S. Hopperstad, O.G. Lademo. Simulation of yield surfaces for aluminium sheets with rolling and recrystallization textures. Computational Materials Science 67 (2013) 424–433.

H. Fransplass, M. Langseth and O.S. Hopperstad. Numerical study of the tensile behaviour of threaded steel fasteners at elevated rates of strain. International Journal of Impact Engineering 54 (2013) 19–30.

K.G. Rakvåg, N. Underwood, G.K. Schleyer, T. Børvik, O.S. Hopperstad. Transient pressure loading of plates with preformed holes. International Journal of Impact Engineering 53 (2013) 44–55.

S. Dumoulin, O.S. Hopperstad, N.A. Sène, P. Balland, R. Arrieux, J.-M. Moreau. Numerical modelling of plastic forming of aluminium single crystals. International Journal of Material Forming 6 (2013) 13–27.

G. Gruben, O.S. Hopperstad, T. Børvik. Simulation of ductile crack propagation in dual-phase steel. International Journal of Fracture 180 (2013) 1–22.

J. K. Holmen, J. Johnsen, S. Jupp, O.S. Hopperstad, T. Børvik. Effects of heat treatment on the ballistic properties of AA6070 aluminium alloy. International Journal of Impact Engineering 57 (2013) 119–133.

N-H. Hoang, O.S. Hopperstad, M. Langseth, I. Westermann. Failure of aluminium self–piercing rivets: An experimental and numerical study. Materials & Design 49 (2013) 323–335.

L. Tabourot, P. Balland, M. Vautrot, O.S. Hopperstad, J. Raujol-Veillé, F. Toussaint. Characterization and modeling of the elastic behavior of a XC68 grade steel used at high strain rates and high temperatures. Key Engineering Materials 554–557 (2013) 1116–1124.

K.G. Rakvåg, T. Børvik, I. Westermann, O.S. Hopperstad. An experimental study on the deformation and fracture modes of steel projectiles during impact. Materials and Design 51 (2013) 242–256

M. Fourmeau, T. Børvik, A. Benallal, O.S. Hopperstad. Anisotropic failure modes of high-strength aluminium alloy under various stress states. International Journal of Plasticity 48 (2013) 34–53.

M. Kristoffersen, T. Børvik, I. Westermann, M. Langseth, O.S. Hopperstad. Impact against an X65 steel pipe – an experimental investigation. International Journal of Solids and Structures 50 (2013) 3430–3445.

J. Johnsen, J. K. Holmen, O.R. Myhr, O.S. Hopperstad and T. Børvik. Finite element simulations of aluminium plates under impact loading using a nanostructure material model. Computational Materials Science 79 (2013) 724–735.

M. Kristoffersen, T. Børvik, M. Langseth, O.S. Hopperstad, H. Ilstad, E. Levold. Damage and failure in an X65 steel pipeline caused by trawl gear impact. Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering OMAE2013 June 9-14, 2013, Nantes, France. OMAE2013–11277.

M. Kristoffersen , F. Casadei, T. Bø­rvik, M. Langseth, G. Solomos, O.S. Hopperstad. Numerical simulations of submerged and pressurised X65 steel pipes. Proceedings of: XII International Conference on Computational Plasticity. Fundamentals and Applications COMPLAS XII. E. Onate, D.R.J. Owen, D. Peric, B. Suarez (Eds). Barcelona, Spain, 3 - 5 September 2013: pp. 1384–1395.

2012

I. Westermann, O. S. Hopperstad, K. Marthinsen, B. Holmedal. Effect of alloying elements on stage-III work-hardening behaviour of Al-Zn-Mg(-Cu) alloys. International Journal of Materials Research (formerly: Zeitschrift fuer Metallkunde) 103 (2012) 603-608.

O.G. Lademo, O. Engler, A. Benallal, O.S. Hopperstad. Effect of strain rate and dynamic strain ageing on work-hardening for aluminium alloy AA5182-O. International Journal of Materials Research (formerly: Zeitschrift fuer Metallkunde) doi: 10.3139/146.110741 (2012).

S. Dumoulin, O. Engler, O.S. Hopperstad, O.G. Lademo. Description of plastic anisotropy in AA6063-T6 using the crystal plasticity finite element method. Modelling and Simulation in Materials Science and Engineering 20 (2012) 055008 (20pp).

E. Fagerholt, E. Østby, T. Børvik and O.S. Hopperstad. Investigation of fracture in small-scale SENT tests of a welded X80 pipeline steel using digital image correlation with node splitting. Engineering Fracture Mechanics 96 (2012) 276–293.

A.S. Ognedal, A.H. Clausen, M. Polanco-Loria, A. Benallal, B. Raka, O.S. Hopperstad. Experimental and numerical study on the behaviour of PVC and HDPE in biaxial tension. Mechanics of Materials 54 (2012) 18–31.

G. Gruben, O.S. Hopperstad, T. Børvik. Evaluation of uncoupled ductile fracture criteria for the dual-phase steel Docol 600DL. International Journal of Mechanical Sciences 62 (2012) 133–146.

Ø. Fyllingen, E.C. Langmoen, M. Langseth, O.S. Hopperstad. Transition from progressive buckling to global bending of square aluminium tubes. International Journal of Impact Engineering 48 (2012) 24–32.

M. Vautrot, P. Balland, O.S. Hopperstad, L. Tabourot, J. Raujol-Veille, F. Toussaint. Characterization of High Carbon Steel C68 at Elevated Temperatures and Different Strain Rates. Technische Mechanik 32 (2012), 577–586.

J. Kang, R.K. Mishra, D.S. Wilkinson, O.S. Hopperstad. Effect of Mg content on Portevin-Le Chatelier band strain in Al-Mg sheet alloys. Philosophical Magazine Letters 92 (2012) 647–655.

K.G. Rakvåg, T. Børvik, O.S. Hopperstad, I. Westermann. Experimental and numerical study on fragmentation of steel projectiles. EPJ Web of Conferences, 2012 (26), p. 04020

2011

K.O. Pedersen, T. Børvik, O.S. Hopperstad. Fracture mechanisms of aluminium alloy AA7075-T651 under various loading conditions. Materials and Design 32 (2011) 97–107.

A. Benallal, T. Berstad, T. Børvik, R. Nogueira des Codes, O.S. Hopperstad. Computational aspects in presence of negative strain-rate sensitivity with application to aluminium alloys exhibiting the Portevin–Le Chatelier effect. Modelling and Simulation in Materials Science and Engineering 19 (2011) 015007 (15pp).

V. Delhaye, A.H. Clausen, F. Moussy, R. Othman, O.S. Hopperstad. Influence of stress state and strain rate on the behaviour of a rubber-particle reinforced polypropylene. International Journal of Impact Engineering 38 (2011) 208–218.

 A. Kane, T. Børvik, T. Berstad, A. Benallal, O.S. Hopperstad. Failure criteria with unilateral conditions for simulation of plate perforation. European Journal of Mechanics A/Solids 30 (2011) 468–476.

G. Gruben, E. Fagerholt, O.S. Hopperstad, T. Børvik. Fracture characteristics of a cold-rolled dual-phase steel. European Journal of Mechanics - A/Solids 30 (2011) 204–218.

Y. Chen, A.H. Clausen, O.S. Hopperstad, M. Langseth. Application of a split-Hopkinson tension bar in a mutual assessment of experimental tests and numerical predictions. International Journal of Impact Engineering 38 (2011) 824–836.

Westermann, I., Snilsberg, K.E., Sharifi, Z., Hopperstad, O.S., Marthinsen, K., Holmedal, B. Three-point bending of heat-treatable aluminum alloys: Influence of microstructure and texture on bendability and fracture behavior. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 42 (2011) 3386–3398.

D. Achani, O.G. Lademo, O. Engler, O.S. Hopperstad. Evaluation of constitutive models for textured aluminium alloys using plane-strain tension and shear tests. International Journal of Material Forming 4 (2011) 227–241.

R. Nogueira de Codes, O.S. Hopperstad, O. Engler, O.-G. Lademo, J.D. Embury, A. Benallal. Spatial and temporal characteristics of propagating deformation bands in AA5182 alloy at room temperature. Metallurgical and Materials Transactions A 42A (2011) 3358–3369.

S. Dey, T. Børvik, O.S. Hopperstad. Computer-aided design of protective structures: Numerical simulations and experimental validation. Applied Mechanics and Materials 82 (2011) 686-691.

H. Fransplass, M. Langseth, O.S. Hopperstad. Tensile behaviour of threaded steel fasteners at elevated rates of strain. International Journal of Mechanical Sciences 53 (2011) 946–957. 

M. Fourmeau, T. Børvik, A. Benallal, O.G. Lademo, O.S. Hopperstad. On the plastic anisotropy of an aluminium alloy and its influence on constrained multiaxial flow. International Journal of Plasticity 27 (2011) 2005–2025.

A. Saai, S. Dumoulin, O.S. Hopperstad. Influence of Texture and Grain Shape on the Yield Surface in Aluminium Sheet Material Subjected to Large Deformations. AIP Conf. Proc. 1353 (2011) 85–90.

2010

K. E. Snilsberg, I. Westermann, B. Holmedal, O. S. Hopperstad, Y. Langsrud, K. Marthinsen. Anisotropy of bending properties in industrial heat-treatable extruded aluminium alloys. Materials Science Forum 638–642 (2010) 487–492.

Ø. Fyllingen, O.S. Hopperstad, A.G. Hanssen, M. Langseth. Modelling of tubes subjected to axial crushing. Thin–Walled Structures 48 (2010) 134–142.

T. Børvik, O.S. Hopperstad, K.O. Pedersen. Quasi-brittle fracture during structural impact of AA7075-T651 aluminium plates. International Journal of Impact Engineering 37 (2010) 537–551.

S. Dumoulin, H. Louche, O.S. Hopperstad, T. Børvik. Heat sources, energy storage and dissipation in high strength steels: Experiments and modelling. European Journal of Mechanics - A/Solids 29 (2010) 461–474.

H. Moe, A. Fredheim, O.S. Hopperstad. Structural analysis of aquaculture net cages in current. Journal Journal of Fluids and Structures 26 (2010) 503–516.

C. Dørum, O.-G. Lademo, O.R. Myhr, T. Berstad, O.S. Hopperstad. Finite element analysis of plastic failure in heat-affected zone of welded aluminium connections. Computers and Structures 88 (2010) 519–528.

L. Rønning, O.S. Hopperstad, P. K. Larsen. Numerical study of the effects of constitutive models on plastic buckling of plate elements. European Journal of Mechanics A/Solids, 29 (2010) 508–522.

Ø. Fyllingen, O.S. Hopperstad, V. Tarigopula. On material batch variation of the dual-phase steel DP800. International Journal of Material Forming 3 (2010) Suppl. 1:199–202.

I. Westermann, O. S. Hopperstad, K. Marthinsen, B. Holmedal. Work-hardening behaviour of a heat-treatable AA7108 aluminium alloy deformed to intermediate strains by compression. Journal of Materials Science 45 (2010) 5323–5331.

V. Delhaye, A.H. Clausen, F. Moussy, O.S. Hopperstad, R. Othman. Mechanical response and microstructure investigation of a mineral and rubber modified polypropylene. Polymer Testing 29 (2010) 793–802

T. Børvik, H. Lange, L.A. Marken, M. Langseth, O.S. Hopperstad, M. Aursand, G. Rørvik. Pipe fittings in duplex stainless steel with deviation in quality caused by sigma phase precipitation. Materials Science and Engineering A 527 (2010) 6945–6955.

O.G. Lademo, O. Engler, J. Aegerter, T. Berstad, A. Benallal, O.S. Hopperstad. Strain-Rate Sensitivity of Aluminum Alloys AA1200 and AA3103. Journal of Engineering Materials and Technology 132 (2010) p. 041007 (8 pp.). 

E. Fagerholt, C. Dørum, T. Børvik, H.I. Laukli, O.S. Hopperstad. Experimental and numerical investigation of fracture in a cast aluminium alloy. International Journal of Solids and Structures 47 (2010) 3352-3365.  

M. Polanco-Loria, A.H. Clausen, T. Berstad, O.S. Hopperstad. Constitutive model for thermoplastics with structural applications. International Journal of Impact Engineering 37 (2010) 1207-1219.

A. Benallal, T. Berstad, T. Børvik, O.S. Hopperstad. Uniqueness, loss of ellipticity and localization for the time-discretized, rate-dependent boundary-value problem with softening. International Journal for Numerical Methods in Engineering 84 (2010) 864–882.

2009

Ø. Fyllingen, O.S. Hopperstad, M. Langseth. Robustness study on the behaviour of top-hat thin-walled high-strength steel sections subjected to axial crushing. International Journal of Impact Engineering 36 (2009) 12–24.

A. Reyes, M. Eriksson, O.-G. Lademo, O.S. Hopperstad, M. Langseth. Assessment of yield and fracture criteria using shear and bending tests. Materials & Design 30 (2009) 596–608.

C. Dørum, H.I. Laukli, O.S. Hopperstad, M. Langseth. Structural behaviour of Al-Si die-castings: Experiments and numerical simulations, European Journal of Mechanics – A/Solids 28 (2009) 1–13.

Ø. Fyllingen, O.S. Hopperstad, O.-G. Lademo, M. Langseth. Estimation of forming limit diagrams by the use of the finite element method and Monte Carlo simulation. Computers & Structures 87 (2009) 128–139.

T. Børvik, M.J. Forrestal, O.S. Hopperstad, T.L. Warren, M. Langseth. Perforation of AA5083-H116 aluminium plates with conical-nose steel projectiles – Calculations. International Journal of Impact Engineering 36 (2009) 426–437.

F. Grytten, T. Børvik, O.S. Hopperstad, M. Langseth. Quasi-static perforation of thin aluminium plates. International Journal of Impact Engineering 36 (2009) 486–497.

F. Grytten, T. Børvik, O.S. Hopperstad, M. Langseth. Low velocity perforation of AA5083-H116 aluminium plates. International Journal of Impact Engineering 36 (2009) 597–610.

H. Alsos, J. Amdahl, O.S. Hopperstad. On the resistance to penetration of stiffened plates. Part II: Numerical analysis. International Journal of Impact Engineering 36 (2009) 875–887.

H. Moe, R.H. Gaarder, A. Olsen, O.S. Hopperstad. Resistance of aquaculture net cage materials to biting by Atlantic Cod (Gadus morhua). Aquacultural Engineering 40 (2009) 126–134.

V. Tarigopula, O.S. Hopperstad, M. Langseth, A.H. Clausen. An evaluation of a combined isotropic-kinematic hardening model for representation of complex strain-path changes in dual-phase steel. European Journal of Mechanics – A/Solids 28 (2009) 792–805.

D. Achani, O.S. Hopperstad, O.-G. Lademo. Behaviour of extruded aluminium alloys under proportional and non-proportional strain paths. Journal of Materials Processing Technology 209 (2009) 4750–4764.

C. Dørum, D. Dispinar, O.S. Hopperstad, T. Berstad. A probabilistic approach for modelling of fracture in magnesium die-castings. Metallurgia Italiana 101 (2009) 1–4.

O.-G. Lademo, O. Engler, S. Keller, T. Berstad, K.O. Pedersen, O.S. Hopperstad. Identification and validation of constitutive model and fracture criterion for AlMgSi alloy with application to sheet forming. Materials & Design 30 (2009) 3005–3019.

A. Kane, T. Børvik, O.S. Hopperstad, M. Langseth. Finite element analysis of plugging failure in steel plates struck by blunt projectiles. Journal of Applied Mechanics 76 (2009) p 051302 (11 pp.).

H. Moe, O.S. Hopperstad, A. Olsen, Ø. Jensen, A. Fredheim. Temporary-creep and post-creep properties of aquaculture netting materials. Ocean Engineering 36 (2009) 992–1002.

Y. Chen, A.H. Clausen, O.S. Hopperstad, M. Langseth. Stress-strain behaviour of aluminium alloys at a wide range of strain rates. International Journal of Solids and Structures 46 (2009) 3825–3835.

Y. Chen, K.O. Pedersen, A.H. Clausen, O.S. Hopperstad. An experimental study on the dynamic fracture of extruded AA6xxx and AA7xxx aluminium alloys. Materials Science and Engineering A523 (2009) 253–262.

I. Westermann, O.S. Hopperstad, K. Marthinsen, B. Holmedal. Ageing and work-hardening behaviour of a commercial AA7108 aluminium alloy. Materials Science and Engineering A524 (2009) 151–157.

C. Dørum, H.I. Laukli, O.S. Hopperstad. Through-process numerical simulations of the structural behaviour of Al-Si die-castings. Computational Materials Science 46 (2009) 100–111.

C. Dørum, O.S. Hopperstad, T. Berstad, D. Dispinar. Numerical modelling of magnesium die-castings using stochastic fracture parameters. Engineering Fracture Mechanics 76 (2009) 2232–2248.

S. Dumoulin, O.S. Hopperstad, T. Berstad. Investigation of integration algorithms for rate-dependent crystal plasticity using explicit finite element codes. Computational Materials Science 46 (2009) 785–799.

D. Achani, O.S. Hopperstad, O-G. Lademo. Influence of advanced yield criteria on predictions of plastic anisotropy for aluminium alloy sheets. International Journal of Material Forming 2 (2009) Suppl. 1:487–490. (DOI 10.1007/s12289-009-0594-6)

I. Westermann, O.S. Hopperstad, K. Marthinsen, B. Holmedal. Work- and age-hardening behaviour of a commercial AA7108 aluminium alloy. Materials Science Forum 618–619 (2009) 555–558.

2008

K.O. Pedersen, H.J. Roven, O.-G. Lademo, O.S. Hopperstad. Strength and ductility of aluminium alloy 7030. Materials Science and Engineering A473 (2008) 81–89.

M. Polanco-Loria, O.S. Hopperstad, T. Børvik, T. Berstad. Finite element modelling of perforation in concrete slabs. International Journal of Impact Engineering 35 (2008) 290–303.

O.G. Lademo, T. Berstad, M. Eriksson, T. Tryland, T. Furu, O.S. Hopperstad, M. Langseth.  A model for process-based crash simulation. International Journal of Impact Engineering 35 (2008) 376–388.

O.-G. Lademo, K.O. Pedersen, T. Berstad, T. Furu, O.S. Hopperstad. An experimental and numerical study on the formability of textured AlZnMg alloys. European Journal of Mechanics – A/Solids 27 (2008) 116–140.

H.S. Alsos, O.S. Hopperstad, R. Törnqvist, J. Amdahl. Analytical and numerical analysis of sheet metal instability using a stress based criterion. International Journal of Solids and Structures 45 (2008) 2042–2055.

V. Tarigopula, O.S. Hopperstad, M. Langseth, A.H. Clausen, F. Hild, O.-G. Lademo, M. Eriksson. A study of large plastic deformations in dual phase steel using digital image correlation and FE analysis. Experimental Mechanics 48 (2008) 181–196.

K.O. Pedersen, O.-G. Lademo, T. Berstad, T. Furu, O.S. Hopperstad. Influence of texture and grain structure on strain localisation and formability for AlMgSi alloys. Journal of Materials Processing Technology 200 (2008) 77–93.

A. Benallal, T. Berstad, T. Børvik, O.S. Hopperstad, I. Koutiri, R. Nogueira de Codes. An experimental and numerical investigation of the behaviour of AA5083 aluminium alloy in presence of the Portevin–Le Chatelier effect. International Journal of Plasticity 24 (2008) 1916–1945.

F. Grytten, B. Holmedal, O.S. Hopperstad, T. Børvik. Evaluation of identification methods for YLD2004-18p. International Journal of Plasticity 24 (2008) 2248–2277.

Ø. Fyllingen, O.S. Hopperstad, M. Langseth. Simulations of a top-hat section subjected to axial crushing taking into account material and geometry variations. International Journal of Solids and Structures 45 (2008) 6205–6219.

V. Tarigopula, O.S. Hopperstad, M. Langseth, A.H. Clausen. Elastic-plastic behaviour of dual-phase, high-strength steel under strain-path changes. European Journal of Mechanics – A/Solids 27 (2008) 764–782.

A. Benallal, T. Berstad, T. Børvik, O. S. Hopperstad, R. Nogueira de Codes. Effects of strain rate on the characteristics of PLC deformation bands for AA5083-H116 aluminium alloy. Philosophical Magazine 88 (2008) 3311–3338.

A. Reyes, O. S. Hopperstad, T. Berstad, O.-G. Lademo. Prediction of necking for two aluminum alloys under non-proportional loading by using an FE-based approach. International Journal of Material Forming  1 (2008) 211–232.

2007

S. Dey, T. Børvik, O.S. Hopperstad, M. Langseth. On the influence of constitutive relation in projectile impact of steel plates. International Journal of Impact Engineering 34 (2007) 464–486.

H. Aretz, O.S. Hopperstad, O.-G. Lademo. Yield function calibration for orthotropic sheet metals based on uniaxial and plane strain tensile tests. Journal of Materials Processing Technology 186 (2007) 221–235.

J.K. Solberg, J.R. Leinum, J.D. Embury, S. Dey, T. Børvik, O.S. Hopperstad. Localised shear banding in Weldox steel plates impacted by projectiles. Mechanics of Materials 39 (2007) 865–880.

C. Dørum, O.S. Hopperstad, O.-G. Lademo, M. Langseth. Energy absorption capacity for thin-walled AM60 castings using a shear-bolt principle. Computers & Structures 85 (2007) 89–101.

Ø. Fyllingen, O.S. Hopperstad, M. Langseth. Stochastic simulations of square aluminium tubes subjected to axial loading. International Journal of Impact Engineering 34 (2007) 1619–1636.

S. Dey, T. Børvik, X. Teng. T. Wierzbicki, O.S. Hopperstad. On the ballistic resistance of doubled-layered steel plates: An experimental and numerical investigation. International Journal of Solids and Structures 44 (2007) 6701–6723.

C. Dørum, O.S. Hopperstad, O.-G. Lademo, M. Langseth. Numerical modelling of the structural behaviour of thin-walled cast magnesium components using a through-process approach. Materials & Design 28 (2007) 2619–2631.

T. Wang, O.S. Hopperstad, O.-G. Lademo, P.K. Larsen. Finite element modelling of welded aluminium members subjected to four-point bending. Thin-Walled Structures 45 (2007) 307–320. 

V. Tarigopula, O.S. Hopperstad, M. Langseth, A.H. Clausen, F. Hild. A study of localisation in dual- phase high-strength steels under dynamic loading using digital image correlation and FE analysis. International Journal of Solids and Structures 45 (2007) 601–619.

H. Moe, A. Olsen, O.S. Hopperstad, Ø. Jensen, A. Fredheim. Tensile properties for netting materials used in aquaculture net cages. Aquacultural Engineering 37 (2007) 252–265.

O.S. Hopperstad, T. Børvik, T. Berstad, O.-G. Lademo, A. Benallal. A numerical study on the influence of the Portevin-Le Chatelier effect on necking in an aluminium alloy. Modelling and Simulation in Materials Science and Engineering 15 (2007) 747–772.

T. Wang, O.S. Hopperstad, O.-G. Lademo, P.K. Larsen. Finite element analysis of welded beam-to-column joints in aluminium alloy EN AW 6082 T6. Finite Elements in Analysis and Design 44 (2007) 1–16.

2006

C. Dørum, O.S. Hopperstad, O.-G. Lademo, M. Langseth. An experimental study on the energy absorption capacity of thin-walled castings.  International Journal of Impact Engineering 32 (2006) 702–724.

V. Tarigopula, M. Langseth, O.S. Hopperstad, A.H. Clausen. Axial crushing of thin-walled high-strength steel sections. International Journal of Impact Engineering 32 (2006) 847–882.

S. Kokkula, M. Langseth, O.S. Hopperstad, O.-G. Lademo. Behaviour of an automotive bumper beam-longitudinal system at 40% offset impact: An experimental and numerical study. Latin American Journal of Solids and Structures 3 (2006) 59–73.

A. Reyes, O.S. Hopperstad, O.-G. Lademo, M. Langseth. Modelling of textured aluminum alloys used in a bumper system: Material tests and characterization. Computational Materials Science 37 (2006) 246–268.

A. Benallal, T. Berstad, T. Børvik, A.H. Clausen, O.S. Hopperstad. Dynamic strain aging and related instabilities: Experimental, theoretical and numerical aspects. European Journal of Mechanics – A/Solids  25 (2006) 397–424.

S. Kokkula, M. Langseth, O.S. Hopperstad, O.-G. Lademo. Offset impact behaviour of bumper beam-longitudinal systems: Experimental investigations. International Journal of Crashworthiness 11 (2006) 299–316.

S. Kokkula, O.S. Hopperstad, O.-G. Lademo, T. Berstad, M. Langseth. Offset impact behaviour of bumper beam-longitudinal systems: Numerical simulations. International Journal of Crashworthiness 11 (2006) 217–336.

T. Wang, O.S. Hopperstad, P.K. Larsen, O.-G. Lademo. Evaluation of a finite element modelling approach for welded aluminium structures. Computers & Structures 84 (2006) 2016–2032.

S. Dey, T. Børvik, O.S. Hopperstad, M. Langseth. On the influence of fracture criterion in projectile impact of steel plates. Computational Materials Science 38 (2006) 176–191.

O.S. Hopperstad, T. Børvik, T. Berstad, A. Benallal. Finite element simulations of the Portevin–Le Chatelier effect in aluminium alloy. Journal de Physique IV 134 (2006) 435–441.

2005

T. Børvik, O.S. Hopperstad, S. Dey, E.V. Pizzinato, M. Langseth, C. Albertini. Strength and ductility of Weldox 460 E steel at high strain rates, elevated temperatures and various stress triaxialities. Engineering Fracture Mechanics 72 (2005) 1071–1087.

C. Dørum, O.S. Hopperstad, O.-G. Lademo, M. Langseth. Numerical modelling of the structural behaviour of thin-walled cast magnesium components. International Journal of Solids and Structures 42 (2005) 2129–2144.

T. Børvik, A.H. Clausen, M. Eriksson, T. Berstad, O.S. Hopperstad, M. Langseth. Experimental and numerical study on the perforation of AA6005-T6 panels. International Journal of Impact Engineering 32 (2005) 35–64.

T. Berstad, T. Furu, B. Holmedal, O.S. Hopperstad, O-G. Lademo, E. Nes, K.O. Pedersen. FEM and a microstructure based work hardening model used to calculate forming limit curves. International Journal of Forming Processes 8 (2005) 71–85.

Ø. Jensen, O.S. Hopperstad, M. Langseth. Transition from progressive to global buckling of aluminium extrusions – A numerical study. International Journal of Crashworthiness 10 (2005) 609–620.

O.G. Lademo, O.S. Hopperstad, T. Berstad, M. Langseth. Prediction of plastic instability in extruded aluminium alloys using shell analysis and a coupled model of elasto-plasticity and damage. Journal of Materials Processing Technology 166 (2005) 247–255.

2004

A. Reyes, O.S. Hopperstad, M. Langseth. Aluminium foam-filled extrusions subjected to oblique loading: Experimental and numerical study. International Journal of Solids and Structure 41 (2004) 1645–1675.

A.H. Clausen, T. Børvik, O.S. Hopperstad, A. Benallal. Flow and fracture characteristics of aluminium alloy AA5083-H116 as function of strain rate, temperature and triaxiality. Materials Science and Engineering A364 (2004) 260–272.

T. Børvik, A.H. Clausen, O.S. Hopperstad, M. Langseth. Perforation of AA5083-H116 aluminium plates with conical-nose steel projectiles – Experimental study. International Journal of Impact Engineering 30 (2004) 367–384.

A. Reyes, O.S. Hopperstad, A.G. Hanssen, M. Langseth. Modeling of material failure in foam-based components. International Journal of Impact Engineering 30 (2004) 805–834.

Ø. Jensen, O.S. Hopperstad, M. Langseth. Experimental investigations on the transition from progressive to global buckling of square aluminium tubes loaded quasi-statically and dynamically. International Journal of Impact Engineering 30 (2004) 973–1003.

S. Dey, T. Børvik, O.S. Hopperstad, J.R. Leinum, M. Langseth. The effect of target strength on the perforation of steel plates using three different projectile nose shapes. International Journal of Impact Engineering 30 (2004) 1005–1038.

O.-G. Lademo, T. Berstad, O.S. Hopperstad, K.O. Pedersen. A numerical tool for formability analysis of aluminium alloys. Part I: Theory. Steel Grips 2 (2004) 427–431.

O.-G. Lademo, K.O. Pedersen, T. Berstad, O.S. Hopperstad. A numerical tool for formability analysis of aluminium alloys. Part II: Experimental validation. Steel Grips 2 (2004) 433–437.

A.G. Hanssen, A. Reyes, O.S. Hopperstad, M. Langseth. Design and finite element simulations of aluminium foam-filled thin-walled tubes. International Journal of Vehicle Design 37 (2004) 126–155.

T. Furu, A. Johansen, J.A. Sæter, A.L. Dons, K.O. Pedersen, T. Berstad, O.-G. Lademo, B. Holmedal, K. Marthinsen, E. Nes, O.S. Hopperstad, D. Mortensen. Through process modeling of extrusion: Evolution in microstructure and mechanical properties through the whole process chain from as cast and homogenized condition to forming of profiles. Aluminium 6 (2004).

2003

O.S. Hopperstad, T. Børvik, M. Langseth, K. Labibes, C. Albertini. On the influence of stress triaxiality and strain rate on the behaviour of a structural steel. Part I. Experiments. European Journal of Mechanics – A/Solids 22 (2003) 1–13.

T. Børvik, O.S. Hopperstad, T. Berstad. On the influence of stress triaxiality and strain rate on the behaviour of a structural steel. Part II. Numerical study. European Journal of Mechanics – A/Solids 22 (2003) 15–32.

T. Børvik, M. Langseth, K.A. Malo, O.S. Hopperstad. Effect of target thickness in blunt projectile penetration of Weldox 460 E steel plates. International Journal of Impact Engineering 28 (2003) 413–464.

T. Børvik, O.S. Hopperstad, A. Reyes, M. Langseth, G. Solomos, T. Dyngeland. Empty and foam-filled circular aluminium tubes subjected to axial and oblique quasi-static loading. International Journal of Crashworthiness 8 (2003) 481–494.

A.H. Clausen, T. Børvik, O.S. Hopperstad. Impact resistance of AA6005 panels. Journal de Physique IV 110 (2003) 693–698.

C. Dørum, O.S. Hopperstad, O.-G. Lademo, M. Langseth. Aluminium and magnesium castings – Experimental work and numerical analyses. International Journal of Crashworthiness 8 (2003) 1–16.

A. Reyes, M. Langseth, O.S. Hopperstad. Square aluminium tubes subjected to oblique loading. International Journal of Impact Engineering 28 (2003) 1077–1106.

A. Reyes, O.S. Hopperstad, M. Langseth. Constitutive modelling of aluminium foam including fracture and statistical variation of density. European Journal of Mechanics – A/Solids 22 (2003) 815–835.

A. Benallal, T. Børvik, A.H. Clausen, O.S. Hopperstad. Dynamic strain aging, negative strain-rate sensitivity and related instabilities. Technische Mechanik 16 (2003) 77–88.

2002

A.G. Hanssen, O.S. Hopperstad, M. Langseth. Validation of constitutive models applicable to aluminium foams. International Journal of Mechanical Sciences 44 (2002) 355–406.

A.H. Clausen, O.S. Hopperstad, M. Langseth. Stretch bending of aluminium extrusions. International Journal of Applied Mechanics and Engineering 7 (2002) 7–32.

T. Børvik, M. Langseth, O.S. Hopperstad, K.A. Malo. Perforation of 12 mm thick steel plates by 20 mm diameter projectiles with flat, hemispherical and conical noses. Part I: Experimental study. International Journal of Impact Engineering 27 (2002) 19–35.

T. Børvik, O.S. Hopperstad, T. Berstad, M. Langseth. Perforation of 12 mm thick steel plates by 20 mm diameter projectiles with flat, hemispherical and conical noses. Part II: Numerical simulations. International Journal of Impact Engineering 27 (2002) 37–64.

A.G. Hanssen, M. Langseth, O.S. Hopperstad. Crash behaviour of foam-based components: Validation and numerical simulations. Advanced Engineering Materials 4 (2002) 771–776.

A. Reyes, M. Langseth, O.S. Hopperstad. Crashworthiness of aluminium extrusions subjected to oblique loading: Experiments and numerical analyses. International Journal of Mechanical Sciences 44 (2002) 1965–1984.

O.G. Lademo, O.S. Hopperstad, K.A. Malo, K.O. Pedersen. Modelling of plastic anisotropy in heat-treated aluminium extrusions. Journal of Materials Processing Technology 125–126 (2002) 84–88.

2001

A.H. Clausen, O.S. Hopperstad, M. Langseth. Sensitivity of model parameters in stretch bending of aluminium extrusions. International Journal of Mechanical Sciences 43 (2001) 427–453.

A.G. Hanssen, M. Langseth, O.S. Hopperstad. Optimum design for energy absorption of square aluminium extrusions with aluminium foam filler. International Journal of Mechanical Sciences 43 (2001) 153–176.

T. Tryland, O.S. Hopperstad, M. Langseth. Finite-element modelling of beams under concentrated loading. ASCE Journal of Structural Engineering 127 (2001) 176–185.

T. Børvik, O.S. Hopperstad, T. Berstad, M. Langseth. Numerical simulation of plugging failure in ballistic penetration. International Journal of Solids and Structure 38 (2001) 6241–6264.

T. Børvik, J.R. Leinum, J.K. Solberg, O.S. Hopperstad, M. Langseth. Shear plug formation in Weldox 460 E steel plates impacted by blunt-nosed projectiles. International Journal Impact Engineering 25 (2001) 553–572.

T. Børvik, O.S. Hopperstad, T. Berstad, M. Langseth. A computational model of viscoplasticity and ductile damage for impact and penetration. European Journal of Mechanics – A/Solids 20 (2001) 685–712.

G. De Matteis, L.A. Moen, M. Langseth, R. Landolfo, O.S. Hopperstad, F.M. Mazzolani. Cross-sectional classification for aluminium beams – Parametric study. ASCE Journal of Structural Engineering 127 (2001) 271–279.

A.G. Hanssen, O.S. Hopperstad, M. Langseth. Design of aluminium foam-filled crash boxes of square and circular cross-sections. International Journal of Crashworthiness 6 (2001) 177–188.

2000

A.G. Hanssen, M. Langseth, O.S. Hopperstad. Static and dynamic crushing of square aluminium extrusions with aluminium foam filler. International Journal Impact Engineering 24 (2000) 347–383.

A.G. Hanssen, M. Langseth, O.S. Hopperstad. Static and dynamic crushing of circular aluminium extrusions with aluminium foam filler. International Journal Impact Engineering 24 (2000) 475–507.

A.G. Hanssen, O.S. Hopperstad, M. Langseth. Bending of square aluminium extrusions with aluminium foam filler. Acta Mechanica 142 (2000) 13–31.

A.G. Hanssen, L. Lorenzi, K.K. Berger, O.S. Hopperstad, M. Langseth. A demonstrator bumper system based on aluminium foam filled crash boxes. International Journal of Crashworthiness 5 (2000) 381–392.

T. Tryland, O.S. Hopperstad, M. Langseth. Design of experiments to identify material properties. Materials & Design 21 (2000) 477–492.

A.H. Clausen, O.S. Hopperstad, M. Langseth. Stretch bending of aluminium extrusions for car bumpers. Journal of Materials Processing Technology 102 (2000) 241–248.

1999

O.S. Hopperstad, B. Leira, S. Remseth, E. Trømborg. Reliability-based analysis of a stretch-bending process for aluminium extrusions. Computers & Structures 71 (1999) 63–75.

M. Langseth, O.S. Hopperstad, T. Berstad. Impact loading of plates. Validation of numerical simulations by testing. International Journal of Offshore and Polar Engineering 9 (1999) 10–15.

O.S. Hopperstad, M. Langseth, T. Tryland. Ultimate strength of aluminium alloy outstands in compression: Experiments and simplified analysis. Thin-Walled Structures 34 (1999) 279–294.

O.-G. Lademo, O.S. Hopperstad, M. Langseth. An evaluation of yield criteria and flow rules for extruded aluminium alloys. International Journal of Plasticity 15 (1999) 191–208.

T. Tryland, O.S. Hopperstad, M. Langseth. Steel girders subjected to concentrated loading – Validation of numerical simulations. Journal of Constructional Steel Research 50 (1999) 199–216.

A.H. Clausen, O.S. Hopperstad, M. Langseth. Stretch bending of aluminium extrusions. Effect of geometry and alloy. ASCE Journal of Mechanical Engineering 125 (1999) 392–400.

A.H. Clausen, O.S. Hopperstad, M. Langseth. Stretch bending of aluminium extrusions. Effect of tensile sequence. ASCE Journal of Mechanical Engineering 125 (1999) 521–529.

A.G. Hanssen, M. Langseth, O.S. Hopperstad. Static crushing of square aluminium extrusions with aluminium foam filler. International Journal of Mechanical Sciences 41 (1999) 967–993.

T. Børvik, M. Langseth, O.S. Hopperstad, K.A. Malo. Ballistic penetration of steel plates. International Journal of Impact Engineering 22 (1999) 855–866.

K.M. Mathisen, O.S. Hopperstad, T. Berstad, K.M. Okstad. Error estimation and adaptivity in explicit nonlinear finite element simulation of quasi-static problems. Computers & Structures 72 (1999) 627–644.

T. Tryland, M. Langseth, O.S. Hopperstad. Non-perfect aluminium beams subjected to concentrated loading. ASCE Journal of Structural Engineering 125 (1999) 900–910.

L.A. Moen, O.S. Hopperstad, M. Langseth. Rotational capacity of aluminium beams under moment gradient: Experiments. ASCE Journal of Structural Engineering 125 (1999) 910–920.

L.A. Moen, G. De Matteis, O.S. Hopperstad, M. Langseth, R. Landolfo, F.M. Mazzolani. Rotational capacity of aluminium beams under moment gradient: Numerical simulations. ASCE Journal of Structural Engineering 125 (1999) 921–929.

M. Langseth, O.S. Hopperstad, T. Berstad. Crashworthiness of aluminium extrusions: Validation of numerical simulations. Effect of mass ratio and impact velocity. International Journal of Impact Engineering 22 (1999) 829–854.

1998

O.S. Hopperstad, T. Berstad, H. Ilstad, O.-G. Lademo, M. Langseth. Effects of the yield criterion on local deformations in numerical simulation of profile forming. Journal of Materials Processing Technology 80–81 (1998) 551–555.

K.A. Malo, O.S. Hopperstad, O.-G. Lademo. Calibration of anisotropic yield criteria using uniaxial tension tests and bending tests. Journal of Materials Processing Technology 80–81 (1998) 538–544.

L. Moen, M. Langseth, O.S. Hopperstad. Elastoplastic buckling of anisotropic aluminium plate elements. ASCE Journal of Structural Engineering 124 (1998) 712–719.

M. Langseth, O.S. Hopperstad, A.G. Hanssen. Crash behaviour of thin-walled aluminium members. Thin-Walled Structures 32 (1998) 127–150.

1997

O.S. Hopperstad, M. Langseth, L. Hanssen. Ultimate compressive strength of plate elements in aluminium: Correlation of finite element analyses and tests. Thin-Walled Structures 29 (1997) 31–46.

1996

M. Langseth, O.S. Hopperstad. Local buckling of square thin-walled aluminium extrusions. Thin-Walled Structures 27 (1996) 117–126.

M. Langseth, O.S. Hopperstad. Static and dynamic axial crushing of square thin-walled aluminium extrusions. International Journal of Impact Engineering 18 (1996) 949–968.

1995

O.S. Hopperstad, S. Remseth. A return mapping algorithm for a class of cyclic plasticity models. International Journal for Numerical Methods in Engineering 38 (1995) 549–564.

O.S Hopperstad, M. Langseth, S. Remseth. Cyclic stress-strain behaviour of alloy AA 6060. Part I: Uniaxial experiments and modelling. International Journal of Plasticity 11 (1995) 725–739.

O.S. Hopperstad, M. Langseth, S. Remseth. Cyclic stress-strain behaviour of alloy AA 6060 T4. Part II: Biaxial experiments and modelling. International Journal of Plasticity 11 (1995) 741–762.

 

Scientific, academic and artistic work

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Journal publications