March 7, 2008 (2:30-4:00 p.m.)
Interschool Lab, Room 750 CEPSR
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2:30-2:40
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Welcome Speech by Prof. Christian Meyer, Chairman
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2:40-3:00
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Introductory Remarks
Prof. Bruno Boley
Professor of Civil Engineering and Engineering Mechanics, Columbia University
Dean Emeritus, School of Engineering and Applied Science, Northwestern University
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3:00-4:00
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Mindlin Lecture
Prof. Jan D.Achenbach
Walter P. Murphy and Distinguished McCormick School Professor
Center for Quality Engineering and Failure Prevention
Northwestern University
From Rayleigh to Lamb to Mindlin: The Story of Waves in an Elastic layer-with a recent addition
| Abstract: The story of guided waves goes back to the last part of the nineteenth
century. Rayleigh discovered surface waves and Lamb showed that an
infinite number of wave modes propagates in an elastic layer. Some
fifty years later Mindlin unraveled the deceptively simple looking
frequency equation for Lamb waves,and used the insight to develop
simple plate theories that account for the lowest modes.The recent
addition mentioned in the title refers to my work on applying the
elastodynamic reciprocity theorem to obtain the elastodynamic
"far-field" due to local high rate excitation of an elastic
layer.The particular example to be discussed, deals with the ultrasound
generated in a layer by line-beam laser irradiation of one side of the
layer. This problem is of interest for non-contact generation of
ultrasound for non-destructive testing purposes. |
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Announcement (by Prof. Alex Cheng, Vice President of the ASCE Engineering Mechanics Institute)
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Prof. Jan Achenbach was
born in the Netherlands,and studied aeronautical engineering at the
Technical University of Delft.He came to the United States in 1959, and
was awarded the Ph.D.Degree by Stanford University in 1962.After a
post-doctoral year at Columbia University, he joined the faculty of
Northwestern in 1963. He is now Walter P.Murphy and Distinguished McCormick School Professor in the departments of Civil and Mechanical engineering.
Achenbach's recent research has been concerned with quantitative non-destructive evaluation and structural health monitoring. He has made contributions in the field of propagation of mechanical disturbances in solids, particularly ultrasonics. He has developed methods for flaw detection and characterization by ultrasonic scattering methods.
Achenbach is founder
of Northwestern's Center for Quality Engineering and Failure
Prevention, a state-of-art laboratory for quality control in structural
mechanics.
Achenbach was awarded the 2003 National Medal of Technology, and the 2005 National Medal of Science.
He was elected a member of the National Academy of Engineering in 1982,
a member of the National Academy of Sciences in 1992 and a fellow of
the American Academy of Arts and Sciences in 1994. In 1999 he was
elected a Corresponding Member of the Royal Dutch Academy of Sciences.
He is also an honorary member of the American Society of Mechanical
Engineers and a fellow of ASME, ASA, SES, AAM and AAAS. His awards include the Timoshenko Medal and the William Prager Medal.
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Previous Mindlin Lectures
