Department News
[기계전공대학원세미나] Prof. Achenbach(Northwestern Univ.)
Seminar Date
2010-09-17
Author
박심령
Date
2010-08-31
Views
1932
1. 제 목 : The Thermoelasticity of Laser-Based Ultrasonics and Related Reciprocity
Considerations
2. 연 사 : JAN DREWES Achenbach
Department of Mechanical Engineering,
McCormick School of Engineering and Applied Science,
Northwestern University, Evanston, IL 60208, USA
3. 일 시 : 2010년 9월 17일 (금) 16:30-17:30
4. 장 소 : 301동 105호
5. 연사약력 :
<Education>
1953-1959 Technische Hogeschool, Delft, aeronautical engineering
1959-1962 Ph. D., Stanford University Major : aeronautics and astronautics
Minor : mathematics
<ACADEMIC CAREER>
1962-1963 Preceptor, Columbia University
1963-1966 Assistant Professor of Civil Engineering, Northwestern University
1966-1969 Associate Professor of Civil Engineering, Northwestern University
April 1969-June 1969 Visiting Associate Professor, University of California, La Jolla
September 1969- March 1981 Professor of Civil Engineering, Northwestern University
September 1970- April 1971 Visiting Professor, Technische Hogeschool, Delft
March 1981 - Walter P. Murphy Professor, Departments of Civil and
Environmental Engineering, Mechanical Engineering, and
Engineering Science and Applied Mathematics
September 1985 - 2006 Director, Center for Quality Engineering and Failure Prevention,
Northwestern University
September 1992 - Distinguished McCormick School Professor, Northwestern Univ.
6. 내용요약 :
The heating of a small area of the surface of a solid body by a focused beam of laser light gives rise to thermal expansion of the irradiated surface domain, which in turn generates ultrasound, often in the form of surface waves. The effect of thermoelastic expansion can be represented by a system of equivalent forces, usually double forces parallel to the free surface. In this lecture a general approach is discussed to determine the equivalent forces for elastic bodies that may be anisotropic and/or inhomogeneous. Once the equivalent forces have been determined, ultrasonic guided-wave signals can be determined by numerical or analytical techniques, the latter provided that the material is homogenous. To circumvent complicated analytical or numerical methods, the reciprocity theorem for elastic solids, be they anisotropic or inhomogeneous, is shown to provide a powerful method to determine laser-generated surface waves or waves in layers. Some examples are presented.
7. 문 의 : 기계항공공학부 송한호 교수 (☏ 880-1651)
Considerations
2. 연 사 : JAN DREWES Achenbach
Department of Mechanical Engineering,
McCormick School of Engineering and Applied Science,
Northwestern University, Evanston, IL 60208, USA
3. 일 시 : 2010년 9월 17일 (금) 16:30-17:30
4. 장 소 : 301동 105호
5. 연사약력 :
<Education>
1953-1959 Technische Hogeschool, Delft, aeronautical engineering
1959-1962 Ph. D., Stanford University Major : aeronautics and astronautics
Minor : mathematics
<ACADEMIC CAREER>
1962-1963 Preceptor, Columbia University
1963-1966 Assistant Professor of Civil Engineering, Northwestern University
1966-1969 Associate Professor of Civil Engineering, Northwestern University
April 1969-June 1969 Visiting Associate Professor, University of California, La Jolla
September 1969- March 1981 Professor of Civil Engineering, Northwestern University
September 1970- April 1971 Visiting Professor, Technische Hogeschool, Delft
March 1981 - Walter P. Murphy Professor, Departments of Civil and
Environmental Engineering, Mechanical Engineering, and
Engineering Science and Applied Mathematics
September 1985 - 2006 Director, Center for Quality Engineering and Failure Prevention,
Northwestern University
September 1992 - Distinguished McCormick School Professor, Northwestern Univ.
6. 내용요약 :
The heating of a small area of the surface of a solid body by a focused beam of laser light gives rise to thermal expansion of the irradiated surface domain, which in turn generates ultrasound, often in the form of surface waves. The effect of thermoelastic expansion can be represented by a system of equivalent forces, usually double forces parallel to the free surface. In this lecture a general approach is discussed to determine the equivalent forces for elastic bodies that may be anisotropic and/or inhomogeneous. Once the equivalent forces have been determined, ultrasonic guided-wave signals can be determined by numerical or analytical techniques, the latter provided that the material is homogenous. To circumvent complicated analytical or numerical methods, the reciprocity theorem for elastic solids, be they anisotropic or inhomogeneous, is shown to provide a powerful method to determine laser-generated surface waves or waves in layers. Some examples are presented.
7. 문 의 : 기계항공공학부 송한호 교수 (☏ 880-1651)
