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Thermal, Viscoplastic Analysis of Composite Laminates

Published online by Cambridge University Press:  22 February 2011

E. Krempl  and
K. D. Lee
E. Krempl
Affiliation:
Rensselaer Polytechnic Institute, Mechanics of Materials Laboratory, Troy, NY 12180-3590
K. D. Lee
Affiliation:
Rensselaer Polytechnic Institute, Mechanics of Materials Laboratory, Troy, NY 12180-3590
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Abstract

For the modeling of ply deformation behavior the orthotropic, thermal viscoplasticity theory based on overstress is used. It can represent creep, relaxation and rate sensitivity as well as monotonic and cyclic loadings. The theory is “unified” since creep and plasticity are not separately modeled. No yield surfaces and loading/unloading conditions are employed. The laminate theory for in-plane loading maintains the geometric assumptions of classical laminate theory. The elasticity law, however, is replaced by the thermal, orthotropic viscoplasticity law. Numerical experiments illustrate the predictions of the theory for an angle-ply and a cross-ply laminate subjected to a temperature increase, temperature hold and subsequent return to the original temperature. The ply and laminate stresses are calculated as a function of time for unconstrained and constrained conditions using postulated properties close to a real metal matrix composite. Redistribution of ply stresses and relaxation are found. In some cases, nearly permanent residual ply stresses are present after completion of the temperature cycle.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 129
Copyright
Copyright © Materials Research Society 1988

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