Abstract
This chapter describes a phenomenological approach to constitutive modeling of the viscoplastic behavior of unidirectional polymer matrix composites under off-axis quasi-static loading conditions. The chapter addresses a combined isotropic and kinematic hardening model for the viscoplastic behavior of unidirectional composites under proportional loading conditions. The chapter then deals with a modified viscoplasticity model that allows prediction of different flow stress levels in off-axis tension and compression in addition to description of the rate dependence, nonlinearity and fiber orientation dependence of the inelastic behavior of unidirectional composites under off-axis monotonic loading conditions. The chapter further attempts to elaborate the combined isotropic and kinematic hardening model so that it can adequately predict the transient creep softening due to stress variation. In the respective phases of sophistication, the accuracies of predictions using the associated viscoplasticity models are evaluated by comparing with the experimental results on unidirectional carbon/epoxy laminates at high temperature.
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