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本文对典型铺设的［０２／±４５２／９０２］ｓ碳／环氧复合材料层板中的典型损伤状态进行了实验观察，测定出损伤对层板刚度引起的下降率。建立了横向裂纹扩展、分层伴以横向裂纹扩展的三维有限元分析模型，计算出对层板刚度引起的下降率，并与实验值进行了比较。结果表明，横向裂纹和分层是层板的主要损伤型式，分层损伤扩展是一个主导性的稳定的损伤扩展过程，是导致刚度下降的主要因素。
In this paper, the typical damage state of [02 / ± 452/902] s carbon / epoxy composite laminates was observed experimentally and the descending rate of damage caused by laminates was measured. A three-dimensional finite element analysis model of lateral crack propagation and stratification accompanied by lateral crack propagation was established, and the rate of decline caused by the stiffness of the laminate was calculated and compared with the experimental data. The results show that transverse cracks and delamination are the main damage types of laminates. Delamination damage propagation is a dominant and stable process of damage propagation, which is the main factor leading to the decrease of stiffness.