Course - Mechanical Properties of Metals - TMT4222
TMT4222 - Mechanical Properties of Metals
Examination arrangement: Oral examination
|Evaluation form||Weighting||Duration||Examination aids||Grade deviation|
The subject is introduced by a review of experimental techniques for characterising mechanical properties with emphasize on simple tensile testing. It is given an introduction to dislocation theory necessary for the understanding of the mechanical properties of metals based on their crystalline nature. In particular the structures of aluminium, and steel are considered as these are of great importance for our national industry. Accordingly the basic mechanisms of yield phenomena and deformation hardening are treated. Relations between the microstructure and the mechanical properties are handled based on simple dislocation models. Furthermore, basic physical metallurgical theories for fracture is examined and an introduction to fatigue is made.
Having completed this course the student should know how to:
- Make simple assumptions and derive based on these the theoretical strength of an ideal crystal.
- Explain how and why plastic deformation of metals occurs by dislocation glide.
- Estimate cutting reactions and explain interactions between dislocations.
- Calculate the distance between partial dislocations.
- Explain how a Frank-Reead dislocation source act and calculate the critical stress to activate it.
- Account for strengthening mechanisms due to work hardening, grain boundaries, alloying elements in solid solution or asparticles.
- Derive the strength contribution from shearable and non-shearable particles.
- Make simple assumptions and derive the theoretical fracture strength of an ideal crystal.
- Account for and apply Griffiths theory about brittle fractures, simple fracture mechanics and a dislocation based model for ductile fractures.
- Explain the difference between low and high cycle fatigue, Paris-Erdogans low for crack growth and give a physical metallurgical description of fatigue in single crystals.
- Make simplifying assumptions and derive Orowans low for dislocation speed.
- Determine the critical slp system and relate the critical resolved shear stress to the tensile stress in a tensile test of a single crystal.
- Describe the various stages of the stress-strain curve resulting from a single crystal tensile test.
- Carry out simple fracture mechanical calculations, discuss the transition from ductile to brittle fracture based on temperature, chemical composition, grain size etc.
- Perform simple mathematical fatigue calculations, apply the Goodman diagram and calculate the lifetime from Miners rule.
- Account for microstructure and slip activity during single crystal fatigue.
Learning methods and activities
Lectures and exercises. Lectures are given in English if there are students from the International master programme.
Expected time spent: Lectures: 56 hours. Exercises: 2 hours. Self study: 120 hours
Further on evaluation
It is allowed to bring an approved simple calculator and an fcc cube with inscribed tetrahedron at the exam. If there is a re-sit examination, the examination form may be changed from written to oral.
Exam registration requires that class registration is approved in the same semester. Compulsory activities from previous semester may be approved by the department.
Recommended previous knowledge
TMT4176 Materials Technology 2 (see course description for 2015/16) or similar.
Dieter "Mechanical Metallurgy", lecture notes.
Credits: 7.5 SP
Study level: Second degree level
Term no.: 1
Teaching semester: AUTUMN 2020
No.of lecture hours: 4
Lab hours: 2
No.of specialization hours: 6
Language of instruction: English
- Materials Science and Engineering
- Physical Metallurgy
- Technological subjects
Examination arrangement: Oral examination
- Term Status code Evaluation form Weighting Examination aids Date Time Digital exam Room *
- Autumn ORD Oral examination 100/100 2020-12-14
Room Building Number of candidates
- * The location (room) for a written examination is published 3 days before examination date. If more than one room is listed, you will find your room at Studentweb.
For more information regarding registration for examination and examination procedures, see "Innsida - Exams"