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Course details
Student Mobility > Programmes and Courses > Courses in English > Course detailsMechanical integrity of structures
- Teaching: Completely taught in English
- ECTS: 4
- Level: Graduate
- Semester: Summer
- Prerequisites:
- Competitions for the enrollment of this course are: fundamentals of strength of materials
- Load:
Lectures Exercises Laboratory exercises Project laboratory Physical education excercises Field exercises Seminar Design exercises Practicum 30 0 0 0 0 0 0 0 - Course objectives:
- The course identifies the modes of mechanical failure emphasizing the most important ones. The topic of fatigue is considered including both high - cycle and low - cycle range. Brittle fracture, ductile rupture, creep, fretting fatigue, and several other failure modes are discussed. The students will be given the opportunity to learn about mechanical failures and about application of failure theories and failure prediction and prevention. Practical examples of mechanical failure from industry are given as well.
- Student responsibilities:
- Grading and evaluation of student work over the course of instruction and at a final exam:
- seminar paper: 50% oral exam: 50%
- Methods of monitoring quality that ensure acquisition of exit competences:
- Consultations with the lecturer and the assistant and student demonstrator allow the students additional explanations of the subject and help with the seminar assignment. After the lecture the students are invited to access available anonymous online evaluation of the course and the lecturer. Upon completion of the exam through voluntary conversations students are interviewed about the level of fulfillment of their expectations regarding the course and are invited to suggest possible improvement of lectures and lecture materials.
- Upon successful completion of the course, students will be able to (learning outcomes):
- The students will be given the opportunity to learn about mechanical failures and about application of failure theories and failure prediction and prevention. Upon successful completion of the course, students will be able to: calculate stress concentration factors analytically and numerically using finite element methods; model and calculate stress concentration factors for complex geometry specimens by using Finite Element Method compare high- and low-cycle fatigue and explain Coffin-Manson model determine accumulated damage at a stress concentration site predict fatigue life until crack initiation for structural members for high cycle or low cycle fatigue; model and calculate creep strain
- Lectures
- 1. Introduction. The role of failure prevention analysis in mechanical design
- 2. Modes of mechanical failure. Definition of failure mode.
- 3. Strength and deformation of engineering metals. An introduction to dislocation theory.
- 4. State of stress and relationship between stress and strain. Elastic and plastic stress - strain relationship.
- 5. High cycle fatigue. Fatigue loading. The S-N curves. Damage accumulation.
- 6. Concepts of cumulative damage.
- 7. Life prediction based on local stress - strain concepts.
- 8. Fracture mechanics approach to crack propagation.
- 9. Fracture criteria - linear elastic and elastic plastic fracture mechanics. Plastic collapse.
- 10. Low cycle fatigue. The strain cycling concepts.
- 11. Thermal fatigue and low cycle fatigue.
- 12. Stress concentration. Stress concentration factors for the elastic range. Stress concentration factors and strain concentration factors for the plastic range.
- 13. Creep. Theories for predicting creep behavior.
- 14. Fretting. Fretting fatigue. Fretting wear.
- 15. Wear. Corrosion. Corrosion fatigue.
- Exercises
- 1. Examples of failure of structures.
- 2. Failure modes observed in practice. A glossary of mechanical failure modes.
- 3. Elastic and plastic deformation. Strain rates effects.
- 4. Stress - strain relationship examples. Ramberg - Osgood relationship. Cyclic stress - strain curve.
- 5. Geometrical discontinuities. Stress concentration factors.
- 6. Linear damage theory. Cumulative damage theories.
- 7. Example of analysis of fatigue life to crack initiation.
- 8. Example of analysis of fatigue crack propagation life.
- 9. Fracture versus plastic collapse - numerical example
- 10. The strain - life curve. Low cycle fatigue relationships. Coffin Manson Relationship.
- 11. Thermal fatigue analysis examples.
- 12. Stress concentration effects. Stress concentration factors calculation.
- 13. Example of creep behavior.
- 14. Damage due to fretting fatigue. Fretting fatigue analysis.
- 15. Fatigue crack propagation life analysis including corrosion effects.
- Compulsory literature:
- Suresh, S., Fatigue of Materials, Cambridge University Press, 2001.
Anderson, T.L., Fracture Mechanics Fundamentals and Applications, 3rd Edition, Taylor & Francis (2005).
Bozic,Z., Dinamička čvrstoća tankostjenih konstrukcija, FSB, Zagreb (in Croatian), 2011. - Recommended literature:
- Collins, J.A., Failure of materials in mechanical design, John Wiley&Sons, 1993.
Bozic,Z. Selected papers