To accomplish material selection and to develop advanced materials, we must know methods to evaluate deformation and strength of materials quantitatively. The elasticity and the theory of dislocations are respectively academic frameworks to understand elastic and plastic deformation behaviors of crystalline materials.
The first half of this course teaches the elasticity and the theory of dislocations. In the second half of this course, explaining the plastic deformation of crystalline materials and the external force to cause the plastic deformation, we consider mechanical properties of practical materials under various conditions and methods to increase strength of materials. Exercise problems are assigned during both of the first and second halves of the course.
By completing this course, students will be able to:
1) Understand methods to evaluate deformation and strength of materials quantitatively, various modes of plastic deformation and fracture, characteristic values representing mechanical properties of materials and necessary conditions of desirable structural materials.
2) Understand the elasticity as fundamental techniques to evaluate deformation and strength of solid materials and the theory of dislocations to discuss mechanisms of plastic deformation of materials.
elasticity, theory of dislocations, crystal defects, mechanics of dislocations, mechanical properties, strengthening mechanisms, creep, high-temperature deformation, fracture, cyclic deformation, fatigue.
|✔ Specialist skills||Intercultural skills||Communication skills||Critical thinking skills||Practical and/or problem-solving skills|
Exercise problems are assigned during the course. To prepare for class, students should read the course schedule section and check what topics will be covered. Required learning should be completed outside of the classroom for preparation and review purposes.
|Course schedule||Required learning|
|Class 1||Fundamentals of the theory of elasticity||The concept of stress and strain as tensors|
|Class 2||Definition of stress and strain||Distortion and strain, and traction and stress|
|Class 3||Exercise problems to understand the theory of elasticity||Coordinate transformation of components of stresses, Hooke's law|
|Class 4||Dislocations and the Burgers vector||Edge, screw and mix dislocations, definition of the Burgers vector|
|Class 5||Geometry of dislocations||Plastic deformation due to dislocation movement|
|Class 6||Mechanics of dislocations||Stresses generated by dislocations, forces on dislocations|
|Class 7||Exercise problems to understand the theory of dislocations||Summary of the theory of dislocations|
|Class 8||Ideal strength of perfect crystals and stress-strain relations of solids||Evaluation of ideal strength and understanding of stress-strain relations|
|Class 9||Plastic deformation of single crystals and work hardening||Motion of dislocations and plastic deformation of crystals|
|Class 10||Plastic deformation of polycrystals and effects of grain boundaries on strength||Relationship between motion of dislocations and grain boundaries|
|Class 11||Strengthening mechanisms of materials||Solid-solution strengthening, precipitate strengthening, dispersion strengthening, work hardening, strengthening by grain refinement|
|Class 12||Creep and high-temperature deformation||Characteristics of plastic deformation at high temperatures|
|Class 13||Fracture and the classification of modes of fracture||Ductile fracture, brittle fracture, relationship between strength ductility|
|Class 14||Cyclic deformation and fatigue||Changes of microstructures caused by cyclic deformation, origin of fatigue|
To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.
M. Kato, S. Kumai and S. Onaka: Zairyo Kyoudo Gaku, Asakura
Students' knowledge on the elasticity, slip deformation and the theory of dislocations, various mechanical properties of metallic materials, and their ability to apply them to problems will be assessed. Exams 70%, exercise problems 30%.