Ultrasonic Evaluation of Stiffness Tensor Changes and Associated Anisotropic Damage in a Ceramic Matrix Composite

[+] Author and Article Information
B. Audoin, S. Baste

Laboratoire de Mecanique Physique, URA CNRS No. 867, Universite Bordeaux I, 351, Cours de la Liberation, 33405-Talence Cedex, France

J. Appl. Mech 61(2), 309-316 (Jun 01, 1994) (8 pages) doi:10.1115/1.2901446 History: Received February 28, 1992; Revised May 27, 1993; Online March 31, 2008


After describing the crucial role of microcracking in the behavior of ceramic matrix composites, we introduce a phenomenological model in the framework of continuum damage mechanics, where damage is defined as the change of the tensor of elasticity. For damage identification, we have developed a specific ultrasonic device. This immersion set-up was connected to a suitable data processing system for an optimum recovery of the stiffness matrix coefficients from convenient sets of velocity measurements. Linked to a tensile machine, it enabled us to measure the stiffness changes and the anisotropic damage induced by a uniaxial tensile test.

Copyright © 1994 by The American Society of Mechanical Engineers
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