Compressive Failure of Fiber Composites: The Roles of Multiaxial Loading and Creep

[+] Author and Article Information
W. S. Slaughter, N. A. Fleck

Cambridge University Engineering Department, Cambridge CB2 1PZ England

B. Budiansky

Division of Applied Sciences, Harvard University, Cambridge, Massachusetts 02138

J. Eng. Mater. Technol 115(3), 308-313 (Jul 01, 1993) (6 pages) doi:10.1115/1.2904223 History: Received June 20, 1992; Revised November 30, 1992; Online April 29, 2008


The roles of multiaxial loading and creep in compressive failure of aligned fiber composites are considered. Analytical models are developed based on the model given by Budiansky and Fleck (1992). The critical microbuckling stress in multiaxial loading is calculated for a rigid-perfectly plastic solid and an elastic-plastic strain hardening solid. The rigid-perfectly plastic results predict a plane compressive failure surface in stress space. The rigid-perfectly plastic results are sufficiently accurate, when compared to the strain hardening results, so long as the remote shear stress and stress normal to the fiber direction are not too large relative to the remote stress in the fiber direction. The model given for creep microbuckling is suitable for power law viscous composite behavior. Deformation within a localized kink band is computed as a function of time. A creep life is predicted, based on a critical strain failure criterion.

Copyright © 1993 by The American Society of Mechanical Engineers
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