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为了研究高径比大于1的复合材料圆柱壳的轴压屈曲性能及其失效模式,对2组单向纤维圆柱壳和3组外侧环裹环向纤维圆柱壳进行了轴压试验,观察了试件的受力过程和破坏形态,获得了荷载-位移曲线和荷载-应变曲线,利用有限元模型分析了单向纤维圆柱壳两种屈曲形式的破坏机制,对比分析了两种铺层试件的轴压性能。结果表明:单向纤维复合材料圆柱壳出现先纵向劈裂后板壳屈曲和先柱壳屈曲后纵向劈裂的两种破坏模式;外侧环向纤维可改善圆柱壳的轴压性能,屈曲发展有一定的阶段性并表现出延性特征,破坏形式和承载力均较为稳定。
In order to study the buckling behavior and failure mode of composite cylindrical shells with aspect ratio greater than 1, axial compression tests were carried out on two groups of unidirectional fiber cylindrical shells and three groups of outer rings wrapped around the circular cylindrical shell. The stress-strain curves and load-strain curves of the uniaxial cylindrical shells were obtained by finite element method. The failure mechanism of two kinds of buckling forms of unidirectional fiber cylindrical shell was analyzed. Axial pressure performance. The results show that two kinds of failure modes of the uniaxial fiber composite cylindrical shell after the first longitudinal splitting buckling and the longitudinal splitting of the first cylindrical shell buckling after bending; the outer circumferential fiber can improve the axial compression performance of the cylindrical shell, buckling development A certain stage and showing ductile characteristics, forms of destruction and bearing capacity are more stable.