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在热固性树脂基复合材料结构的固化成型经历了先升温后降温的变化过程中,由于纤维相和基体相热胀系数不同产生的热失配,以及树脂材料基体在降温过程中的固化收缩,结构内部产生了残余应力,导致热固性树脂基复合材料结构在出模后发生翘曲变形。本文建立了热固树脂复合材料结构固化变形分析的细观力学理论模型和数值模型,通过试验确定了树脂基体的固化收缩参数,分析玻纤/环氧树脂体系的单向复合材料和正交铺层复合材料热胀系数、固化变形和残余应力,理论预测和试验结果吻合。
In the process of thermosetting resin-based composite structure, the temperature of the thermosetting resin-based composite structure undergoes a temperature rise and then decreases in temperature. Due to the thermal mismatch between the thermal expansion coefficients of the fiber phase and the matrix, and the curing shrinkage of the resin material during cooling, Internal residual stress, resulting in thermosetting resin-based composite structure warping deformation occurred after the mold. In this paper, a theoretical model and a numerical model of meso-mechanics for the structural deformation analysis of thermosetting resin composites were established. The curing shrinkage parameters of the resin matrix were determined through experiments. The unidirectional composites of glass fiber / epoxy resin system and orthogonal Layer composite thermal expansion coefficient, solidification deformation and residual stress, the theoretical prediction and experimental results match.