Numbering Code	G-ENE03 63340 LJ75 G-ENE03 63340 LJ28 G-ENE03 63340 LJ71	Year/Term	2022 ・ First semester
Number of Credits	2	Course Type	Lecture
Target Year	Master's students	Target Student
Language	Japanese	Day/Period	Tue.2
Instructor name	ABE MASATAKA (Graduate School of Energy Science Associate Professor)
Outline and Purpose of the Course	Failures of mechanical/functional components/elements are caused by the initiation and the subsequent growth of a crack. Quantitative evaluation of cracking behavior is required to prevent their failure. Fracture mechanics is a useful mechanical framework to describe the stress-strain field around a crack-tip. Cracking behavior can be estimated quantitatively by using fracture mechanics parameters. Therefore, it is important for students to learn fracture mechanics so that they can retrain or control failures of mechanical/functional components/elements. The goal of this lecture is to learn fracture mechanics including its background and its application to fracture behavior of mechanical/functional components/elements. Statistical approaches are also given to learn treatment of strength scatter.
Course Goals	This class aims to help students to acquire and to apply fundamentals of fracture mechanics so that they can retrain and control failures of mechanical/functional components/elements.
Schedule and Contents	This lecture will cover the following topics. The lecturer states the following topics and allocates the number of weeks in a bracket for each topic. The order of each topic is not fixed and the lecturer decides the lecture policy depending on the students’ background and understanding. (1) Examples of system failures [1 week] Typical failure examples in the past are explained, and the lecturer educates the necessity of strength study. (2) Fundamentals of linear elastic fracture mechanics [4 weeks] The lecturer describes the stress-strain field around a crack-tip in elastic cracked-body subjected to loading. Stress intensity factor is introduced as a fracture mechanics parameter governing the stress-strain field, and evaluations of stress intensity factors are mentioned for various boundary conditions. (3) Plastic deformation at crack-tip [1 week] Formation and shape of plastic zone at crack-tip is lectured in an elastic-plastic cracked-body subjected to loading. (4) Energy theory of fracture [3 weeks] Each process in material fracture is mentioned based on energy theory from atomic level to macroscopic viewpoints. J integral is introduced as a dominant parameter in elastic and non-elastic body. (5) Analyses of fracture phenomena based on fracture mechanics [4 weeks] Static and fatigue strength is especially evaluated by using fracture mechanics parameters, and some issues to be noted are also mentioned in applying fracture mechanics parameters. (6) Statistical analysis of strength [2 weeks] Statistical approaches to analyzing scatter in loading and strength properties are introduced.
Evaluation Methods and Policy	[Evaluation method] Evaluation will be based on one written examination. [Evaluation standard] The lecture marks a written examination out of 100. 60 and above: Passed 59 and below: Failed
Course Requirements	It is desired that students should acquaint themselves with fundamentals on mechanics and strength of solid.
Study outside of Class (preparation and review)	Students should prepare lessons by reading related parts of textbook according to class progress.
Textbooks	Textbooks/References	基礎強度学, 星出敏彦, (内田老鶴圃), ISBN:978-4-7536-5131-3, (第2版2刷)
References, etc.	Study-aid documents are uploaded on KULASIS. Students should download them, and bring printed documents or mobile equipment, in which they are downloaded, in class.