Strength and Fracture of Materials
TeachersHASHIMOTO, KeizoStaffInfo
Grade, SemesterYear 3 1st semest [Department of Aerospace Engineering, Faculty of Science and Engineering]
CategoryBasic Major Subjects
Elective, CreditsElective Requisites 2credit
 Syllabus Number2D302

Course Description

Since the invention of the airplane, research into the strength and fracture of materials has made indispensable contributions to establishing safety and reliability. The subjects of this course includes the fundamental knowledge of the strengthening and fracture mechanisms of materials, which engineers must have. Lattice defects and dislocations, the stress strain relation, the strengthening mechanism of metals, creep at high temperature, fracture mechanics and fatigue phenomenon will be presented systematically, based on the elasticity theory.

Course Objectives

This course presents the strength and fracture of materials in conjunction with the lattice defects. Properties of materials applying to airplanes and space vehicles will be discussed from the viewpoint of strengthening metallic materials. Student can discuss with experts in the field of strength and fracture of materials. The course includes the following topics,
1. Fundamental elasticity theory
2. Lattice defects and dislocation
3. Stress- strain relation
4. Strengthening mechanism of materials
5. Creep
6. Fracture mechanics
7. Fatigue

Grading Policy

Final examination (80%),report (20%)

Textbook and Reference

TextbookZairyokyoudogaku (Strength of materials)
M.Kato, S.Kumai and S.Onaka Asakura Pub.Co. ISBN-13 978-425436934


Student must pre-study scientific terms. Lecture note and related papers will be shown up in LMS. Since understanding of lattice defects is not easy, related topics will be presented by DVD animation. Homework will be shown in LMS.


Solid mechanics 1 was taken. DVD ‘Introduction to Engineering Materials’ by C.J.McMahon will be utilized to understand dislocation.


1Elasticity theory 1: Definition of stress, strain and shear stress, shear strain

2Elasticity theory 2: Hooke’s law for isotropic elastic body

3Lattice defects and dislocation 1: Categorize lattice defects and dislocation

4Lattice defects and dislocation 2: Edge and screw dislocations in crystal

5Lattice defects and dislocation 3: Stress field of screw dislocation

6Stress-strain relationship 1: Stress-strain curve

7Stress-strain relationship 2: Criterion of necking

8Strengthening mechanism 1: Solid solution strengthening and precipitation strengthening

9Strengthening mechanism 2: Dispersion strengthening and grain refining
10Creep and deformation at high temperature 1: What is creep deformation?

11Creep and deformation at high temperature 2: Macroscopic deformation, effects of temperatures and strain rates

12Fracture mechanics 1: Griffith’s criterion of brittle fracture

13Fracture mechanics 2: Plane strain condition and fracture toughness

14Fatigue and cyclic deformation 1: Fatigue crack propagation and Paris rule

15Final examination and summaries