An Inelastic Constitutive Equation of Fiber Reinforced Plastic Laminates

[+] Author and Article Information
Y. Kanagawa, S. Murakami, T. Mizobe

Department of Mechanical Engineering, University of Nagoya, 464-01 Furou, Chikusa-ku Nagoya Aichi, Japan

J. Eng. Mater. Technol 120(1), 13-18 (Jan 01, 1998) (6 pages) doi:10.1115/1.2806831 History: Revised July 31, 1996; Received December 25, 1996; Online November 27, 2007


A Constitutive model for describing the time dependent inelastic deformation of unidirectional and symmetric angle-ply CFRP (Carbon Fiber Reinforced Plastics) laminates is developed. The kinematic hardening creep law of Malinin and Khadjinsky and the evolution equation of Armstrong and Frederick are extended to describe the creep deformation of initially anisotropic materials. In particular, the evolution equations of the back stresses of the anisotropic material were formulated by introducing a transformed strain tensor, by which the expression of the equivalent strain rate of the an isotropic material has the identical form as that of the isotropic materials. The resulting model is applied to analyze the time dependent inelastic deformation of symmetric angle ply laminates. Comparison between the predictions and the experimental observations shows that the present model can describe well the time dependent inelastic behavior under different loadings.

Copyright © 1998 by The American Society of Mechanical Engineers
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