本文对玻璃纤维增强复合材料层合板进行了拉、剪多向应力本构关系的实验研究,成功地用软x射线照相观察到材料内部微裂纹沿纤维方向近似均匀分布,并沿裂纹面扩展至破坏的损伤形貌,同时结合声发射技术等监测其扩展规律。在此基础上建立了基于微观机制的微裂纹损伤模型,预测材料的损伤非线性本构关系和破坏,以及实验观察到的一些复合材料特有的损伤现象,理论预测结果与实验值吻合。 In this paper, the glass fiber reinforced composite laminates subjected to tensile and shear multi-directional stress constitutive relationship of the experimental study of soft x-ray successfully observed the material within the microcracks along the fiber direction approximately uniform distribution, and along the crack surface extended to Damage the damage morphology, combined with acoustic emission techniques to monitor its expansion law. On this basis, a microcrack damage model based on microscopic mechanism was established to predict nonlinear damage constitutive relations and damage of materials, as well as experimental observations of some specific damage phenomena of composite materials. The theoretical predictions are consistent with experimental values.