Proceedings of the National Academy of Sciences of the United States of America

About the PNAS Member Editor
Name Achenbach, Jan D.
Location Northwestern University
Primary Field Engineering Sciences
 Election Citation
Achenbach is a world leader in the mathematical study of wave propagation in solids and in the theory of ultrasonic methods of quantitative non-destructive evaluation of materials. He has also made significant contributions of permanent value in the mechanics of non-linear and dynamic fracture.
 Research Interests
Current research activities are in two fields: ultrasonic methods in quantitative non destructive evaluation and fracture mechanics. Has developed methods for materials evaluation and crack detection and characterization. For materials evaluation a line-focus acoustic microscope operating at 225 MHz is used to determine the elastic constants of thin-film/substrate configurations, for homogeneous but anisotropic thin films as well as for superlattice films. Ultrasonic scattering techniques are used to determine the location, size, shape and orientation of cracks in solids by the use of conventional ultrasonic techniques and non-contact methods such as laser-based ultrasonics. Experimental work is supplemented by the development of analytical and numerical measurement models. Work in fracture mechanics has been primarily on dynamic fracture. Has also carried out research on structural acoustics, earthquake mechanisms and on the mechanical behavior of composite materials under dynamic loading conditions.

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