Off-Diagonal Elastic Constants and Anisotropic Damage

[+] Author and Article Information
S. Baste, A. Gerard

Laboratoire de Mecanique Physique, U.R.A. C.N.R.S. no. 867, Universite de Bordeaux I, Talence, France

J. Energy Resour. Technol 114(3), 244-249 (Sep 01, 1992) (6 pages) doi:10.1115/1.2905948 History: Received November 01, 1989; Revised January 30, 1992; Online April 16, 2008


Various anisotropic damage models are investigated to take into account the nonlinear behavior of a ceramic matrix composite. A critical analysis of classical strain metrology results proves that it is unfeasible to evaluate the damage in a direction orthogonal to the stress one, because the nine elasticity constants of an orthotropic material are independent and Poisson’s ratios are strain’s second order, whereas Young’s modulus are first-order ones. An ultrasonic method provides the necessary stiffness variations, inaccessible by classical strain measurements, required to identify the anisotropic damage.

Copyright © 1992 by The American Society of Mechanical Engineers
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