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RESEARCH PAPERS: Gas Turbines: Vehicular

Modeling the Effective Elastic Behavior of a Transversely Cracked Laminated Composite

[+] Author and Article Information
D. J. Thomas

Department of Civil Engineering, Cleveland State University, Cleveland, OH 44115

R. C. Wetherhold

Department of Mechanical and Aerospace Engineering, State University of New York, Buffalo, NY 14260-4400

J. Eng. Gas Turbines Power 120(1), 191-198 (Jan 01, 1998) (8 pages) doi:10.1115/1.2818075 History: Received February 01, 1996; Online November 19, 2007

Abstract

The solution for the stress state present in the vicinity of transverse matrix cracks within a composite laminate is typically obtained by assuming a regular crack spacing geometry for the problem and applying a shear-lag analysis. In order to explore the validity of this underlying assumption, the probability density function for the location of the next transverse matrix crack within a crack bounded region is examined. The regular crack spacing assumption is shown to be reasonable from an engineering point of view. Continuing with this assumption, a generalized shear-lag model for multilayer, off-axis laminates subjected to full in-plane loads is developed. This model is used to quantitatively evaluate the effective elastic properties of the damaged material. The results are applicable to materials such as ceramic matrix or polymer matrix unidirectional fiber systems where damage in the form of transverse matrix cracks arises.

Copyright © 1998 by The American Society of Mechanical Engineers
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