一方向AS4/PEEKの高温における非主軸非弾性挙動とそのマイクロメカニックス解析

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Nonlinear stress-strain behavior of a unidirectional carbon fiber-reinforced composite AS4/PEEK under various off-axis loading conditions at high temperature was examined with particular emphases on the rate and loading-mode dependence of the response. Monotonic tensile stress-strain curves at high temperature accompanied marked nonlinearity for all off-axis angles except θ=0^○.Permanent strains were clearly observed for all kinds of off-axis specimens after unloading. The off-axis permanent strain remaining after unloading became larger as the applied maximum stress increased. The strain and stress rates have appreciable influences on the flow stress of the off-axis nonlinear stress-strain relationships. These observations indicate that the off-axis nonlinear deformation of this composite involved an irrecoverable inelastic part and it was characterized by a viscoplastic deformation mechanism. In view of these experimental results, a simple micromechanics model for predicting the off-axis rate-dependent nonlinear stress-strain behavior of unidirectional AS4/PEEK was developed using the Aboudi's cell method for homogenizing composite behavior and the Chaboche's viscoplastic constitutive model for describing the rate-dependent inelastic behavior of the matrix material. The primitive calculations using the micromechanics model developed favorably reproduced the off-axis rate-dependent nonlinear behavior for the unidirectional AS4/PEEK at high temperature.
2000-12-25

一方向AS4/PEEKの高温における非主軸非弾性挙動とそのマイクロメカニックス解析

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