Strength of Materials

Course title

C0037000

Course description

Although material mechanics is fundamental to the design of structures, a different approach from that based on fracture mechanics is indispensable for large structures fabricated by welding, because internal defects are always existing in such structures. In addition, since material properties in high-temperature environments are different from those at room temperature, strength calculations in high-temperature environments will also be discussed in this lecture. Finally, the course will provide students with the knowledge to perform safety design considering fracture by using abundant case studies.

Purpose of class

Understand what fracture mechanics is and why it is necessary by reviewing actual accident examples of large structures, and understand the importance of fracture mechanics in structural design. In addition, this course provides students with the fundamentals of strength calculation using fracture mechanics through exercises on actual structure design using fracture mechanics. Furthermore, the course aims to learn the concept of material strength in high temperature environment, learn the concept of safety design of high temperature equipment, and master the concept and specific methods of designing structures safely as the final objective.

Goals and objectives

Understand what fracture mechanics is and the necessity of fracture mechanics, and be able to calculate strength using it.
Understand high-temperature deformation of materials from the viewpoint of materials science, and be able to calculate the strength (life time) of materials using constitutive equations.
Understand fatigue of materials and be able to calculate the life of structures based on crack propagation prediction equations and fatigue life prediction equations.

Relationship between 'Goals and Objectives' and 'Course Outcomes'

	Final report	Total.
1.	30%	30%
2.	30%	30%
3.	40%	40%
Total.	100%	-

Evaluation method and criteria

A score of 60 or higher is required to pass the course, with 100 points allocated for the final report.　The standard for 60 points is to be able to calculate fracture strength using stress intensity factor, calculate fatigue life using fatigue crack propagation law, and perform case studies on creep problems.

Language

English

Class schedule

	Class schedule	HW assignments (Including preparation and review of the class.)	Amount of Time Required
1.	Guidance for this lecture	Review syllabus	190minutes
2.	Ideal Strength of Materials and Strength of Materials Containing Defects Ideal Strength of Materials Energetic conditions for rapid fracture Stress Intensity Factor, Critical Stress Intensity Factor Demonstration of fracture toughness as a measure of adhesion strength	Preparation of handouts (Ideal Strength of Materials and Strength of Materials Containing Defects)	90minutes
2.		Review of lecture content including practice problems	100minutes
3.	Microscopic Fracture Mechanisms Microscopic mechanism of rapid fracture (cleavage fracture) Example of Crack Fracture (Fracture of Steel at Low Temperature, Polymer) Microscopic mechanism of rapid fracture (ductile tearing) Example of ductile rupture (fracture of metal at room temperature)	Preparation of handouts (Microscopic Fracture Mechanisms)	90minutes
3.		Review of lecture content including practice problems	100minutes
4.	Fracture mechanics parameters and their measurement Small-scale yielding *Fracture toughness testing (e.g., standard compact tension specimens)	Preparation of handouts (Fracture mechanics parameters and their measurement Small-scale yielding)	90minutes
4.		Review of lecture content including practice problems	100minutes
5.	Case Studies of Catastrophic Failures Catastrophic Failure of Pressure Tanks Safety design method of pressure equipment using pre-failure leakage method	Preparation of handouts (Case Studies of Catastrophic Failures)	90minutes
5.		Review of lecture content including practice problems	100minutes
6.	Fatigue Fracture Classification of Fatigue Failure Fatigue behavior of crack-free members High cycle fatigue Low cycle fatigue *Life calculation using high-cycle fatigue life rule	Preparation of handouts (Fatigue Fracture )	90minutes
6.		Review of lecture content including practice problems	100minutes
7.	Fatigue behavior of cracked members Crack propagation and the Paris law Crack Growth Experimental Methods	Preparation of handouts (Fatigue behavior of cracked members)	90minutes
7.		Review of lecture content including practice problems	100minutes
8.	Fracture behavior of pre-cracked materials and remaining life prediction using the crack propagation rule *Examples of accidents in aircraft	Preparation of handouts (Fracture behavior of pre-cracked materials and remaining life prediction using the crack propagation rule)	90minutes
8.		Review of lecture content including practice problems	100minutes
9.	Creep and Creep Failure Definition of High and Low Temperature Creep test and creep curve *Stress dependence of creep strength	Preparation of handouts (Creep and Creep Failure)	90minutes
9.		Review of lecture content including practice problems	100minutes
10.	Temperature dependence of high temperature strength and stress relaxation Temperature dependence of strain rate Arrhenius law Stress relaxation and creep Example of calculation for tightening bolt of turbine generator casing	Preparation of handouts (Temperature dependence of high temperature strength and stress relaxation)	90minutes
10.		Review of lecture content including practice problems	100minutes
11.	Kinetics of Diffusion Fick's law Diffusion in solids (atomic energy and diffusion, frequency) *Mechanism of diffusion (lattice diffusion, grain boundary diffusion, dislocation core diffusion)	Preparation of handouts (Kinetics of Diffusion)	90minutes
11.		Review of lecture content including practice problems	100minutes
12.	Creep Mechanism Mechanism and Constitutive Equations of Creep Dislocation creep Diffusion creep (viscous creep) Deformation mechanism diagram	Preparation of handouts (Creep Mechanism )	90minutes
12.		Review of lecture content including practice problems	100minutes
13.	Creep Damage and Creep Failure Constitutive equations for rupture life Creep Life Prediction by Parametric Method (Larson-Miller parameter, Orr-Sherby-Dorn parameter, Manson-Harferd parameter, Manson -Brown parameter)	Preparation of handouts (Creep Damage and Creep Failure)	90minutes
13.		Review of lecture content including practice problems	100minutes
14.	Final report	Review all handouts	180minutes
Total.	-	-	2650minutes

Feedback on exams, assignments, etc.

ways of feedback	specific contents about "Other"
Feedback in the class

Textbooks and reference materials

Download lecture materials from designated website．

Prerequisites

Requires prior study of mechanics of materials.

Office hours and How to contact professors for questions

Wednesday, 10：00 to 12：00

Regionally-oriented

Non-regionally-oriented course

Development of social and professional independence

Course that cultivates a basic self-management skills
Course that cultivates a basic problem-solving skills

Active-learning course

More than one class is interactive

Course by professor with work experience

Work experience	Work experience and relevance to the course content if applicable
Applicable	The course will provide a practical approach to reliability design based on experience in ship design and fabrication.

Education related SDGs:the Sustainable Development Goals

9.INDUSTRY, INNOVATION AND INFRASTRUCTURE
12.RESPONSIBLE CONSUMPTION & PRODUCTION

Last modified : Sat Mar 08 04:27:41 JST 2025