Thermo-viscoelastic homogenization of 3D woven composites with time-dependent expansion coefficients

Stress relaxation in the viscoelastic matrix influences evolution of thermal expansion and chemical shrinkage polymer composites. Its effects are included into a model generalized Maxwell type by means time-dependent coefficients. A homogenization strategy is proposed to obtain these coefficients composite from constituent behaviors, taking account effects. The homogenized behavior validated full-scale finite element simulations. It reproduces features such as sign changes strain rate close glass transition temperature creep effects, which can have an important impact on residual stress formation composites, but not taken classical thermo-elastic methods.