Examination arrangement

Course content

This course discusses the basics of mechanics and materials science with the objective of rationalizing, predicting, modifying and describing the mechanical behavior of materials. The focus is on the correlation between structure-property-performance.

The course starts with the relationship between stress and strain in the elastic regime, followed by the theories of plasticity and failure. It concentrates on the physics of plastic deformation and its interaction with the microstructure. The course also considers different mechanisms of strengthening of metals through grain refining, alloying with interstitial and substitutional solutes, precipitates, second-phase, etc. Contemporary approaches towards modelling the strain hardening behaviour are highlighted too.

For polymers, the temperature dependence of mechanical properties, and failure mechanisms such as yielding, crazing, creep and stress rupture are presented. Time-dependent viscoelastic response of polymers is evaluated from Kelvin, Maxwell, Zener, and four parameter models. Curve fitting of relaxation stresses is carried out by using Prony series. Boltzmann superposition principle and the time-temperature superposition principle are reviewed. Rubbers with nonlinear elastic stress-extension characteristics are introduced.

A selection of ‘super-materials’ with extreme mechanical properties are introduced and reviewed at the end of the course.

Learning outcome

Knowledge:

• Advanced knowledge about micro-macro relationships and theory of plasticity in relation to plastic forming.
• Knowledge about time and temperature dependent response of polymers, failure mechanisms, and rubber elasticity.
• Knowledge and understanding of quantitative relationships used for mechanical properties of materials.

Skills:

• Apply the knowledge to the material groups aluminium, steel, stainless steel, and polymers.
• Basic modeling of viscoelasticity, applying the Boltzmann superposition principle, modelling of the behaviour of rubbers, and the estimation of homogenized properties for composites.

General competence:

• Carry out case studies with other students and plan, perform, and present the results.
• Can cooperate and have a good understanding of cooperative working procedures.
• Ability to communicate in technical language.

Learning methods and activities

The teaching is based on lectures, exercises, and a project work. For project work, a list of possible topics will be provided. However, proposals for interesting course related topics are also welcome. The students work in teams on a selected topic.

Further on evaluation

The outcome of teamwork in the form of two short reports and two presentations will be evaluated, and 30% + 30% = 60% of the final grade will be based on this evaluation. If significant differences in the contributions from group members have been documented, individual adjustment of final grading may be considered.Portfolio assessment is the basis for the grade in the course. The portfolio includes individual home assignments (max 40%) and compulsory project works in groups (max 60%). The results for the parts are given in %-scores, and the entire portfolio is assigned a Pass/Fail grade from the 65% total result level.For a re-take of the course, all assessments during the course must be re-taken.

Exercise hours are intended for working on home assignments and on the project work with guidance from TAs and the professors. Individually completed home assignments are handed in at specific deadlines throughout the semester. Projects works are presented, and handed in as groupwork at the end of the semester (usually before the examination-period).

Recommended previous knowledge

Background knowledge comparable with TMM4100 Materials Technology 1.

Course materials

Will be specified in the first lecture.

Credit reductions