国际工程科学大师Jan D. Achenbach教授学术报告
时间：2010年9月20号下午4:00pm-5:30pm
地点：浙江大学玉泉校区永谦活动中心二楼报告厅
题目：Ultrasonics for Quantitative Non-Destructive Evaluation and Structural Health Monitoring
报告人：美国西北大学Jan D Achenbach教授
主持人：浙江大学校长、中国科学院院士杨卫
报告人简介
Jan D. Achenbach，美国西北大学土木与机械工程系Walter P. Murphy和McCormick杰出学院教授，他在固体力学和无损检测领域作出了杰出的贡献，特别是力学扰动的传播、定量无损检测、复合材料损伤机理、复杂结构振动等问题，并获得了代表美国技术和科学领域创新最高荣誉的国家技术奖（2003）和国家科学奖（2005）。他分别于1982、1992和1994年入选美国工程院、科学院和艺术与科学院院士，并在1999年入选荷兰皇家科学院。他是美国机械工程师学会的荣誉会员，是ASME、ASA、SES、AMA和AAAS的Fellow。Achenbach教授多次获得科技领域的著名奖项，包括Timoshenko奖、William Prager奖和Theodore von Karman奖。他培养了一批杰出的力学家和工程师。
报告摘要：
Ultrasonics for Quantitative Non-Destructive Evaluation and Structural Health Monitoring
Jan D. Achenbach
Department of Mechanical Engineering
McCormick School of Engineering and Applied Science
Northwestern University
Evanston, IL 60208
USA
The field of theoretical and applied mechanics has played a vital role in the development of several areas of science and technology that are of current interest. An example is the area of ultrasonics.
The speaker is a member of the Sputnik Generation whose interest in T&AM, which started with the dawn of the space age, has passed through various areas of elastodynamics, to a current interest in the use of ultrasound for quantitative non-destructive evaluation (QNDE) and structural health monitoring (SHM) of safety-critical structures, such as aircraft, bridges and nuclear reactors.
The aim of QNDE and/or SHM is to determine whether damage that may have developed in a structure is sufficiently small that failure can be precluded with a high degree of certainty within a subsequent preset interval of time. If that is the case, the structural system can be allowed to function for that interval; otherwise, the structure must be taken off-line for further inspection, repair or replacement. Ultrasonics plays a very significant role in QNDE and SHM. Of particular interest for the use of ultrasound is the development of measurement models which approximate as closely as possible the generation and quantitative detection of ultrasonic signals. The theoretical work in this area is generally based on the classical results of Rayleigh and Lamb. It is, however, shown that another classical result, the reciprocity theorem, can be used with great advantage to obtain the ultrasonic fields generated by focused laser illumination, scattering by cracks and other defects, and acoustic emission.