学术讲座通知
发布时间：2010-04-15字体：【大 中 小】 【打印】 【关闭】
2010年4月26日起，通过外办引智项目特邀请日本名城大学教授、疲劳专家田中启介（Keisuke Tanaka）先生来北京进行一周左右的学术访问，其间将在中航工业北京航空材料研究院安排四次学术讲座，日期和内容安排如下：
1、4月26日上午 疲劳过程和裂纹起始
通过疲劳失效事故，介绍疲劳研究的意义，特别是裂纹起始的观察研究方法和目前获得的结果，包括EBSD，AFM等方法，介绍微观力学模型，超高周疲劳等。
2、4月27日上午 疲劳裂纹扩展
断裂力学方法对裂纹扩展寿命预测的研究，载荷和材料参数对扩展速率的影响，裂纹闭合的影响等；
3、4月28日上午 带有缺口或缺陷材料的疲劳强度
尺寸小于1毫米的小裂纹扩展行为，力学研究方法，缺陷尺寸与疲劳强度，小裂纹与缺口疲劳，带缺口构件多轴疲劳门槛值。
4、4月29日上午 残余应力对疲劳强度的影响
残余应力对疲劳强度的影响，以及利用残余应力的疲劳改善方法；X射线、同步辐射、中子衍射等残余应力测量方法的最新进展介绍，特别是在热障涂层、表面残余应力上的应用。
另外，5月5日在北京航空航天大学举行一次学术讲座。
以上讲座的具体时间和地点在晚些时候会另行通知。欢迎大家届时光临！
联系方式：
序 号 姓 名 电 话
1 黄新跃 62496728
2 于慧臣 62496718
田中启介教授简介
1971年在日本京都大学获博士学位。1971-1991年在京都大学担任助手、副教授，1991-2007年担任日本名古屋大学教授，1972-1973年在英国剑桥大学和谢菲尔德大学研修，1980年美国西北大学访问学者，1981-1983年美国里海大学副教授，现任日本名古屋大学名誉教授和名城大学教授。田中教授是国际上疲劳断裂方面的著名专家，在该领域已经进行了几十年的研究，特别是在金属的疲劳裂纹起始和扩展以及残余应力测量技术方面，进行了大量卓有成效的工作，一直处于该领域的研究前沿。田中教授是多个著名国际期刊的编委会委员，是多个国际系列学术会议的国际委员，对当前国际上的疲劳、断裂研究有深入的了解，他的研究成果得到学术界的高度评价，在国际刊物上发表了大量有影响的文章（450余篇），主编和参编了12部英、日文专著，具有很高的学术地位。
讲座内容介绍：
1. Fatigue process and crack initiation ( Seminar 1 at BIAM on April 26th)
After the introduction of the history of the structural failure accidents, the importance of understanding of the basic fatigue processes is emphasized, and especially the crack initiation process is focused. Seminar 1 cover the following topics: microscopic and nanoscopic observations of fatigue crack initiation process by electron backscattering diffraction (EBSD) and atomic force microscopy (AFM), micromechanical modeling of fatigue crack initiation, and very high cycle fatigue.
2. Fatigue crack propagation (Seminar 2 at BIAM on April 27th)
Fracture mechanics provide us a tool of the prediction of the fatigue life by integrating the fatigue crack propagation law from the initial crack length to the final crack length. The influences of the loading and materials parameters on the relation between the crack propagation rate and the stress intensity range will be explained and the significance of fatigue crack closure will be emphasized. Seminar 2 will cover the following topics: near threshold crack propagation, nonlinear fracture mechanics of crack propagation, and mixed-mode crack propagation.
3. Fatigue strength of materials with notches and defects (Seminar 3 at BIAM on April 28th)
Small fatigue cracks with dimensions less than about 1 mm can propagate faster than the long cracks and also they can propagate even below the threshold of the stress intensity range. This is a serious problem for damage tolerance design. The characteristic behavior of small fatigue cracks will be presented and mechanics approach to deal with those small cracks will be introduced. Seminar 3 will cover the following topics: small crack propagation, defect-size effect on fatigue strength, small crack in notch fatigue, and fatigue thresholds of notched components under multiaxial loading.
4. Residual stress effect on fatigue strength (Seminar 4 at BIAM on April 29th)
Residual stresses have a big effect on the fatigue strength of materials and structures, and they have been used to improve the strength by various methods of surface treatment. X-ray diffraction method has been used to measure the residual stress in crystalline materials such as metals and ceramics. Recent advancement of synchrotron and neutron diffraction method has enabled us to measure the residual stress deep inside the materials. Seminar 4 will cover the recent advancement of the residual stress measurement by X-ray, synchrotron and neutron diffraction methods. Special attention will be focused on the applications to thermal barrier coating (TBC) and other surface treatments.
5. Current topics on fatigue mechanisms and mechanics (Seminar at Beijing Aeronautical and Astronautical University on May 5th)
The prevention of fatigue failure has been one of the most important subjects to design engineers. The understanding of the basic fatigue processes plays a vital role to improve the fatigue design methodology. In this seminar, the state-of-art of the understanding of fatigue mechanisms and mechanics will be introduced, and current topics on fatigue mechanisms and mechanics will be covered. Examples of topics covered are fatigue of nanocrystalline metals, fatigue life of notched bars under multiaxial loading, and crack propagation in lead-free solder joint materials. Some future directions of fatigue studies will be suggested.