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REVIEW ARTICLES: Mechanics of Compression Failure in Composites

Instability and Failure of Fiber Composites in Compression

[+] Author and Article Information
S. Kyriakides, E. J. Perry, K. M. Liechti

Engineering Mechanics Research Lab, Department of Aerospace Engineering and Engineering Mechanics, University of Texas, Austin TX 78712

Appl. Mech. Rev 47(6S), S262-S268 (Jun 01, 1994) doi:10.1115/1.3124420 History: Online April 29, 2009

Abstract

This paper addresses the uniaxial compressive failure of unidirectional, fiber-reinforced polymer matrix composites. The material that was used in this combined experimental/numerical effort was APC-2/AS4. Failure was found to result in kink bands of distinct widths oriented at an angle to the line of loading. Kink bands were preserved by conducting a series of experiments where failure was confined. Fiber misalignments in the prepreg and from the lamination process were identified as the imperfections that, in conjunction with the nonlinear shear response of the matrix material, essentially govern the formation of zones of localized bending. This, in turn, causes fibers to break and into distinct kink bands. The process was modeled by considering a micro-section of material with wavy fibers under compression. The formulation accounted for material and geometric nonlinearities and various distributions of waviness. It was illustrated that failure is associated with a limit load instability, followed by localized fiber bending which leads to kinking.

Copyright © 1994 by American Society of Mechanical Engineers
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