2025Year

First Semester

Advanced Course of Impact Engineering

Lecture

Advanced Course of Impact Engineering

Z1900020 Advanced Course of Impact Engineering

TANAKA Katsumasa

2.0Credits

Wed.5Period

Shinjuku Campus

A) A high degree of specialized expertise　100%
B) The skills to use science and technology　0%
C) The ability to conduct research independently, knowledge pertaining to society and occupations, and sense of ethics required of engineers and researchers　0%
D) Creative skills in specific areas of specialization　0%

It is increasingly important to properly address impact problems, such as a collision of cars and trains, shocks of falling objects, a collision of scattered debris with typhoons and tornadoes, and an earthquake, for ensuring a safe living in society. A behavior of a structure when receive an impact load is different from that of a static load. It is, therefore, necessary to accurately understand the difference between the two for conducting the safety design of structure.
　The objective of this lecture is to understand the impact phenomenon as the propagation of stress wave. In particular, the course focuses on the stress analysis based on the one-dimensional stress wave propagation with elasticity.

It is desirable to be interested in a safety evaluation and design of products and to understand the basics of strength of materials, linear algebra and analysis.

Not used

1. Introduction to impact engineering
2. Impact problem based on particle dynamics
3. Impact problem based on strength of material
4. Dynamic elastic theory
5. One-dimensional theory of wave propagation
6. Propagation, reflection and transmission of stress wave
7. Propagation analysis of wave stress using graphical method (1)
8. Propagation analysis of wave stress using graphical method (2)
9. Propagation analysis of wave stress using mathematical method (1)
10. Propagation analysis of wave stress using mathematical method (2)
11. Results of propagation analysis between graphical and mathematical methods
12. Analysis of inverse problem on longitudinal impact against one-dimensional structure
13. Approximation analysis of wave stress using mass-spring system
14. Stress analysis of elasto-plastic bar at impact (1)
15. Stress analysis of elasto-plastic bar at impact (2)

Evaluation will be conducted based on the practice in the lecture (40%) and the end-of-the-semester report (60%). The degree of understanding is evaluated on a 6-point scale (A+, A, B, C, D and F). The course credit will be accepted with grade D or higher.

When returning the exercise of every class, a comment will be given in the lecture about the points of the exercise.

No textbook is required for this course.

石川信隆ほか3名，基礎からの衝撃工学，森北出版（2008），ISBN：978-4-627-94711-5
横山隆 編著，衝撃工学の基礎と応用，共立出版（2014），ISBN：978-4-320-08195-6

Shinjuku, Friday, 1:40-12:30, A-1776
ktanaka@cc.kogakuin.ac.jp

有限要素解析など，数値解析ツールの大幅な進歩によって，現在では複雑な衝撃問題を，誰もが簡単に扱うことができるようになっている．しかし，そこで得られた解を正しく解釈するためには，衝撃現象を理解し，その問題解決のための知識を習得することが要求される．衝撃問題の場合，荷重は応力波となって固体の中を伝播する，すなわち波動の問題として考えることができることを，この講義を通じて理解し，数値解析の結果を正しく判断するための基礎知識を身につけてほしい．

Not applicable

Mechanical Engineering Program