Examination arrangement

Course content

The topic covers the basic topics and applications of fracture and notch mechanics. The fundamental concepts include linear and elastic-plastic fracture and notch mechanics. Local criteria for brittle fracture in metals are presented.

Emphasis is placed on the fundamental theoretical solutions and methods for stress and displacement analysis. Significant attention is given to crack and contact problems, singular asymptotic stress fields and three-dimensional problems. Emphasis is placed on engineering applications of elasticity and examples are generally worked through to final expressions for the stress and displacement fields in order to explore the engineering consequences of the results. Among the topics treated in the course advanced solutions are presented for the study of sharp and blunt V-notches in bidimensional and three-dimensional problems. The main local stress and energy parameters are also presented and discussed. The applications include fracture toughness testing of metals and failure assessment strategies in order to assess the failure of structures both under static and fatigue loading. High priority is given to computational fracture and notch mechanics (Williams and Fadle solution) and a course in computational mechanics on the FE codes ANSYS and ABAQUS are included as an important part of the topic.

Learning outcome

Kunnskap: Kandidaten skal ha:

• Kunnskap om grunnleggende brudd- og hakkmekanikk teorier.
• Forståelse for anvendelse av bruddmekanikk på konkrete brudd- og kjervmekaniske problemstillinger.
• Detaljert kunnskap om FE baserte beregningsverktøy for modellering av brudd- og kjervmekaniske problemer

Ferdigheter: Kandidaten skal kunne:

• Utlede bruddmekaniske teorier og vurdere resultatene.
• Gjennomføre bruddmekaniske analyser og løse ingeniørfaglige problemer.
• Gjennomføre bruddmekanisk beregninger basert på FE-koder.

Generell kompetanse: Kandidaten skal ha:

• Generell kompetanse innen grunnleggende og anvendt bruddmekanikk.
• God bakgrunn til å kunne gjennomføre selvstendige beregninger.

Learning methods and activities

Lectures, exercises and finite element course on ANSYS and ABAQUS for fracture mechanics calculations. The lectures and exercises are in English when students who do not speak Norwegian take the course. If the teaching is given in English the examination papers will be given in English only. In this case the students also have to reply in English.

Further on evaluation

Portfolio assessment is the basis for the grade in the course. The portfolio includes weekly exercises (50%), Abaqus project (25%) and a written report (25%). The results for the parts are given in %-scores, while the entire portfolio is assigned a letter grade. For a re-take of an examination, all assessments during the course must be re-taken.

1) Weekly exercises have to be delivered every week, one week after the assignment.

2) Abaqus project has to be delivered at the end of the course (usually within 30th November)

3) The report has also to be delivered at the end of the course (usually within 30th November)

Recommended previous knowledge

None.

Course materials

T. L. Anderson: Fracture Mechanics. Fundamentals and Applications, CRC Press, 2004. Other suggested Material Radaj, Dieter, Vormwald, Michael Advanced Methods of Fatigue Assessment, Springer 2013 Chin-Teh Sun, Zhihe Jin, Fracture Mechanics, Elsevier 2012 E.E.Gdoutos, Fracture Mechanics An Introduction 2005, Springer E.E. Gdoutos, Fracture Mechanics Criteria and Applications, 2005, Springer J. R Barber, Elasticity 2010, Springer Lectures provided by the responsible of the course Notes on numerical applications by using Abaqus and Ansys

Credit reductions