機械材料強度学

科目名
Course Title
授業コード 単位数 配当年次 開講期間
Term
科目分類 ナンバリング
コード
曜日
コマ
教室 担当教員氏名
Instructor
機械材料強度学
Strength of Mechanical Engineering Materials
P120080001 2 1 後期授業 専門科目 TMMEE6212-J1 水5 B4-東K-103 楳田 努
陸 偉

オフィスアワー

Fridays, 16:30-17:30, Bldg. B4, 3rd Floor, Room E334.
You can ask questions face-to-face or via Zoom.

授業目標

In this class, attending students are expected to understand the following terms and to become to be able to
apply them to practical problems:

1) The fundamentals of the microscopic structure of materials (for example, lattice structure and lattice
defects of metallic materials) and the mechanism of plastic deformation (dislocation and slip systems)

2) The fundamentals of the fracture mechanics including topics such as ductile – brittle transition, stress
intensity factor and so on

3) The fundamentals of the fractography, S–N curve and mathematical model for evaluating fatigue fracture

4) The fundamentals of the mechanism of high-speed deformation of materials (thermal activation mechanism) and
the constitutive equation (the stress–strain relationship) under high strain-rate condition

This class also aims to develop reading comprehension and presentation skills in English.

教科書

Printed or PDF reference materials will be distributed.

William F. Hosford, "Solid Mechanics", Cambridge University Press (2010), pp.130-(179).
Marc A. Meyers, "Dynamic Behavior of Materials", John Wiley & Sons, Inc. (1994), pp.296-343.

関連科目

Advanced Mechanics and Strength of Materials, Advanced Theory of Elasticity,
Advanced Numerical Methods of Applied Mechanics.

授業時間外の学習(準備学習等について)

This class will be held in the form of taking-turns explaining. Attending students are assumed to have the
basic knowledge of the mechanics of material strength. All the attending students have to prepare Japanese
translation of sequel part of designated English textbook that will be worked at next lesson.

The person in charge of the lesson will be expected to explain not only the meanings of words including
technical terms but also the context with sufficient understanding.

As a matter of principle, the equations and citations described in that part of the textbook should be shown
with the process of derivation and the supplementary explanation by referring to corresponding literature
respectively.

授業の概要

In order to develop the insight into the mechanisms of the deformation and fracture of materials or structures,
it is important to study them from micro-, meso- and macro-scopic viewpoints. In the recent development of the
transport, furthermore, it has been necessary to know the dynamic behavior of materials with accuracy.

In this class, the metal materials are primarily treated within the fundamentals of the strength and
fracture of materials (dislocation, fractography, fracture mechanics, fatigue fracture, and so on) and
the dynamic behavior of materials (stress wave propagation, strain rate dependence, and so on), and the
theory and practical measuring methods of the dynamic characteristics of materials are focused on.

Developing reading comprehension and speaking in English is also aimed at.

授業計画

1) Crystal structure and lattice imperfection
(PowerPoint material and "Dynamic Behavior of Materials", pp.337-(340))

2) Dislocation and slip system
("Dynamic Behavior of Materials", pp.(340)-342)

3) Thermally activated dislocation motion
("Dynamic Behavior of Materials", pp.342-343(, 330-331))

4-5) Ductile fracture and brittle fracture (1-2)
("Solid Mechanics", pp.130-137)

6) Ductile-brittle transition
("Solid Mechanics", pp.137-142)

7-8) Fundamentals of fracture mechanics and stress intensity factor (1-2)
("Solid Mechanics", pp.143-(149))

9-10) Fundamentals of fracture mechanics and stress intensity factor (3-4)
("Solid Mechanics", pp.(150)-155)

11) Fatigue fracture and fractography
("Solid Mechanics", pp.161-(167))

12) High-strain-rate material testing methods and Details of the Hopkinson bar method (1)
("Dynamic Behavior of Materials", pp.296-302)

13) High-strain-rate material testing methods and Details of the Hopkinson bar method (2)
("Dynamic Behavior of Materials", pp.303-307)

14-15) Constitutive equations at high strain rates (1-2)
("Dynamic Behavior of Materials", pp.323-(330))

成績評価

Evaluated by the attendance and discussion at each class (50%) and some papers (50%).
The ratios of achievement objectives 1)–4) in the total record of papers are 1) 30 %, 2) 20 %, 3) 20 %,
and 4) 30 %.