Strength and Fracture of Materials (Mechanical Engineering)

Academic unit or major

Undergraduate major in Mechanical Engineering

Instructor(s)

Akira Todoroki / Yoshihiro Mizutani

Class Format

Lecture (Face-to-face)

Media-enhanced courses

-

Day of week/Period
(Classrooms)

3-4 Tue

Class

-

Course Code

MEC.C331

Number of credits

100

Course offered

2025

Offered quarter

2Q

Syllabus updated

Mar 19, 2025

Language

Japanese

Syllabus

Course overview and goals

Based on the fundamentals of mechanics learned in Mechanics of Materials and Elastoplastic Mechanics, the instructor will teach the points listed below.
1.Introduction of material strength and failure rule
2. Energy release rate and stress intensity factor
3. Principle of superposition, relationship between stress intensity factor and energy release rate
4. Effect of plastic deformation, small scale yielding and Fracture toughness test
5. Fracture resistance curve, brittleness at low temperature and dynamic fracture
6. Fatigue failure, stress corrosion cracking and creep fracture

Course description and aims

By the end of this course, students will be able to:
1. Understanding of Introduction of material strength and failure rule
2. Understanding of Energy release rate and stress intensity factor
3. Understanding of Principle of superposition, relationship between stress intensity factor and energy release rate
4. Understanding of Effect of plastic deformation, small scale yielding and Fracture toughness test
5. Understanding of Fracture resistance curve, brittleness at low temperature, dynamic fracture and stress corrosion cracking
6. Understanding of Fatigue failure, stress corrosion cracking and creep fracture

This subject corresponds to acquisition of the learning objectives as follows
6. Advanced specialized academic ability in mechanical engineering
7. Ability to utilize specialized knowledge to solve new problems and make creative proposals.

Keywords

Failure accident, Crack, Energy release rate, Stress intensity factor, Fracture toughness, R-curve, Fatigue, Non-Destructive Inspection, Fracture control design

Competencies

• Specialist skills
• Intercultural skills
• Communication skills
• Critical thinking skills
• Practical and/or problem-solving skills
• 6. Advanced specialized academic ability in mechanical engineering 7. Ability to utilize specialized knowledge to solve new problems and make creative proposals.

Class flow

Students will understand of basic properties of material strength, as well as the fundamentals of fracture mechanics.Homework or mini-examinations will be assigned in some classes for students to deepen their understanding. Please carefully read the learning goals for each class, and prepare and review diligently.

Course schedule/Objectives

Study advice (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)

Distributing materials for each class

Reference books, course materials, etc.

Hideo Kobayashi, Fracture Mechanics (ISBN 978-4-320-08100-0), Kyoritsu Shuppan Co., Ltd.

Evaluation methods and criteria

Graded with the results of several exercises

Related courses

• Mechanics of materials
• Elastoplastic mechanics

Prerequisites

It is preferable that all the students have enough knowledge on mechanics of materials and elastoplastic mechanics.