In critical design of mechanical structures, not only cost reduction but also weight reduction are demanded. In order to realize
the critical design, we should use many kinds of materials such as composite materials for mechanical structures and have
to secure safety and reliabilities.
The most important factor is safety in the mechanical design and we have to learn fracture mechanics and strength of materials. In the first half of this class, you learn basic theories of fracture mechanics and metal fatigue. The second half covers fracture phenomena of many kinds of materials and material strengths such as brittle / ductile materials including new materials, etc. In addition, the damage detection and evaluation technology used for safety maintenance is described.
The most important factor is safety in the mechanical design and we have to learn fracture mechanics and strength of materials. In the first half of this class, you learn basic theories of fracture mechanics and metal fatigue. The second half covers fracture phenomena of many kinds of materials and material strengths such as brittle / ductile materials including new materials, etc. In addition, the damage detection and evaluation technology used for safety maintenance is described.
Students learn fracture mechanics and metal fatigue in this class in order to be able to design the critical mechanical parts
and structures.
And students also learn basic knowledge on damage mechanisms, strength evaluation methods considering damage detection / evaluation techniques used for safety maintenance of materials / structures.
And students also learn basic knowledge on damage mechanisms, strength evaluation methods considering damage detection / evaluation techniques used for safety maintenance of materials / structures.
- To understand and explain phenomenon of material fracture
- To understand and explain stress intensity factor
- To understand phenomenon of Metal fatigue
- To understand and explain the strength evaluation methods for advanced materials and structures.
- To understandand explain the damage mechanisms for advanced materials and structures.
- To understand the damage detection technologies and apply those to the reliability evaluation of advanced materials and structures.
| Class schedule | HW assignments (Including preparation and review of the class.) | Amount of Time Required | |
|---|---|---|---|
| 1． | Guidance and Outline | Review of stress, strain, stress conversion and strength calculation. | 100minutes |
| Preparation of stress concentration and stress intensity factor. | 100minutes | ||
| 2． | Fracture mechanics and Stress Intensity Factors | Review of stress intensity factor and small scale yielding. | 100minutes |
| Investigation of metal fatigue and accident examples due to fatigue. | 100minutes | ||
| 3． | Metal fatigue: Fatigue strength | Review of metal fatigue. | 100minutes |
| Preparation of Size Effect in metal fatigue . | 100minutes | ||
| 4． | Metal fatigue: Size effect | Review of Size Effect in metal fatigue . | 100minutes |
| Preparation of Notch Effect in metal fatigue . | 100minutes | ||
| 5． | Metal fatigue: Notch effect | Review of Notch Effect in metal fatigue . | 100minutes |
| Preparation of Manson-Coffin low. | 100minutes | ||
| 6． | Metal fatigue: Low cycle fatigue | Review of low cycle fatigue. | 100minutes |
| Preparation of modified Miner's rule | 100minutes | ||
| 7． | Metal fatigue: Fatigue under various loading | Review of modified Miner's rule | 100minutes |
| Investigation of causes of fatigue failure accidents. | 100minutes | ||
| 8． | Guidance, Characteristics of aerospace structures, Fracture control for materials and structures | Preparation of handout and review from class 1 to class 7. | 120minutes |
| Preparation of report. | 80minutes | ||
| 9． | Brittle materials and ductile materials, Loading type and fracture mode | Preparation of handoutand and review of this class. | 90minutes |
| Preparation of report. | 110minutes | ||
| 10． | Structure of composite materials, Strength tests of composite materials | Preparation of handout and review of this class. | 90minutes |
| Preparation of report. | 110minutes | ||
| 11． | Special lecture "Fatigue characteristics of magnesium alloy" |
Study metal fatigue. | 90minutes |
| Report for the required theme. | 240minutes | ||
| 12． | 3-dimensional stress fields, Strain energy and equivalent stress | Preparation of handout and review of this class. | 90minutes |
| Preparation of report. | 110minutes | ||
| 13． | Visualization of defects and strength design methods of casting materials, Strength design methods considering small defects | Preparation of handout and review of this class. | 90minutes |
| Preparation of report. | 110minutes | ||
| 14． | Fatigue fracture parameters and fracture control design procedure | Preparation of handout and review of this class. | 100minutes |
| Preparation of report. | 110minutes | ||
| Total. | - | - | 2940minutes |
| quiz for the first term | Reports for the first term | Reports for the second term | Total. | |
|---|---|---|---|---|
| 1. | 10% | 0% | 10% | |
| 2. | 10% | 5% | 15% | |
| 3. | 15% | 10% | 25% | |
| 4. | 20% | 20% | ||
| 5. | 15% | 15% | ||
| 6. | 15% | 15% | ||
| Total. | 35% | 15% | 50% | - |
In the first part of the lecture, students are evaluated by three times quiz (50%).
In the second part of the lecture, students are evaluated based on reports during classes (50%).
Students can pass getting 60 points out of total 100 points. The details will be explained during the first class.
In the second part of the lecture, students are evaluated based on reports during classes (50%).
Students can pass getting 60 points out of total 100 points. The details will be explained during the first class.
Japanese textbook of "Strength of Materials", ISBN 978-4-901381-26-0
Handout.
References: H. Kobayashi, “Fracture mechanics”, Kyoritsu Shuppan Co., LTD. and Y. Murakami, “Metal fatigue: effects of small defects and nonmetallic inclusions”, Yokendo LTD.
Handout.
References: H. Kobayashi, “Fracture mechanics”, Kyoritsu Shuppan Co., LTD. and Y. Murakami, “Metal fatigue: effects of small defects and nonmetallic inclusions”, Yokendo LTD.
- 14:50～15:50 of Tuesday, anytime when I’m in my room, except for the special situation.
- Course that cultivates an ability for utilizing knowledge
- Course that cultivates a basic problem-solving skills
| Work experience | Work experience and relevance to the course content if applicable |
|---|---|
| Applicable | Until the 7th time in the first half, faculty members who were engaged in the design and development of machine tools will use their experience to teach basic ideas about material strength in machine elements and machine structures. In the second half, faculty member who was engaged in the estimate design and detailed design of machines will explain the practical problems in strength design based on the experiences when necessary. |
- 4.QUALITY EDUCATION
- 9.INDUSTRY, INNOVATION AND INFRASTRUCTURE
- 12.RESPONSIBLE CONSUMPTION & PRODUCTION
Last modified : Fri Mar 18 23:03:04 JST 2022