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2023　Deformation and Strength of Solids

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Academic unit or major
Graduate major in Materials Science and Engineering
Instructor(s)
Onaka Susumu  Terada Yoshihiro 
Class Format
Lecture    (Face-to-face)
Media-enhanced courses
Day/Period(Room No.)
Mon1-2(J2-303（J234）)  Thr1-2(J2-303（J234）)  
Group
-
Course number
MAT.M410
Credits
2
Academic year
2023
Offered quarter
2Q
Syllabus updated
2023/3/20
Lecture notes updated
-
Language used
English
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Course description and aims

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.

Student learning outcomes

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.

Keywords

elasticity, theory of dislocations, crystal defects, mechanics of dislocations, mechanical properties, strengthening mechanisms, creep, high-temperature deformation.

Competencies that will be developed

✔ Specialist skills Intercultural skills Communication skills Critical thinking skills Practical and/or problem-solving skills

Class flow

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

  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 Tensile test and creep test Definition of tensile test and creep test
Class 9 Evaluation of strength by tensile test Young's modulus, yield stress, ultimate tensile strength, ductility, toughness
Class 10 Evaluation of strength by creep test Creep curve, creep deformation mechanisms
Class 11 Glide and climb of dislocations Orowan's equation, diffusion and dislocation-climb
Class 12 Strengthening mechanisms of solids Solid-solution strengthening, precipitation strengthening, dislocation strengthening, grain boundary strengthening
Class 13 Conception of internal stress Internal stress, effective stress, strain-transient stress-dip test
Class 14 Exercise problems to understand the strengthening mechanisms of solids Summary of the strengthening mechanisms of solids

Out-of-Class Study Time (Preparation and Review)

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.

Textbook(s)

None required.

Reference books, course materials, etc.

M. Kato, S. Kumai and S. Onaka: Zairyo Kyoudo Gaku, Asakura

Assessment criteria and methods

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%.

Related courses

  • MAT.M205 ： Fundamentals of Stress and Strain, and Deformation of Metals
  • MAT.M303 ： Lattice Defects and Dislocation

Prerequisites (i.e., required knowledge, skills, courses, etc.)

None required.

Other

NA

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