基于黏弹性本构模型的热固性树脂基复合材料固化变形数值仿真模型

针对热固性树脂基复合材料热压罐成型工艺过程,采用广义Maxwell(麦克斯韦)黏弹性本构模型建立了残余应力和固化变形的三维模型。模型考虑了复合材料固化过程中的热-化学效应、材料的热胀冷缩效应、基体树脂黏弹性效应以及材料的各向异性。通过与文献中实验结果的比较,证明了所建立的模型具有较高的可靠性。对复合材料C型制件的固化过程进行了数值模拟和实验对比,比对结果表明该数值模型具有较高的准确性。

Numerical simulation for curing deformation of resin matrix thermosetting composite using viscoelastic constitutive model

According to the autoclave forming process of thermoset resin composites, a three-dimensional model which uses the generalized Maxwell viscoelastic constitutive model was established to calculate the residual stress and curing deformation. Thermo-chemical behavior, thermal expansion and contraction behavior, viscoelastic behavior and anisotropy were fully considered in the model. According to the comparison with experiment data in reference, the model established is proved to have relative superior reliability. The curing process of C-shaped composite structure was numerical simulated and compared with experimental data, and the results show high precision of the numerical model in predicting the curing deformation.