中文摘要：

为解决水下复合材料仿真精度低的问题,采用非线性数值分析方法对复合材料圆柱壳体的水下屈曲行为进行研究。通过算例表明了非线性屈曲数值分析与试验结果的吻合性较好,验证了数学模型和计算方法的有效性。对比了铝合金、Carbon/Epoxy、Boron/Epoxy和Glass/Epoxy4种材料圆柱壳体的水下非线性屈曲行为,结果表明纤维的拉伸模量对于圆柱壳体的耐压能力有较大影响,Carbon/Epoxy是水下圆柱壳体比较理想的一种材料,最后分析了矩形、T形和L形肋骨复合材料圆柱壳体的水下非线性屈曲行为,通过分析可知,T形肋骨对于提高圆柱壳体的屈曲压力是最明显的。研究结果对于复合材料在水下的应用及研究有较大的参考价值和指导作用。

英文摘要：

In order to solve low accuracy in underwater composite simulation,the nonlinear numerical analysis method was used to study underwater buckling behaviors of a composite cylindrical shell. The results show that the simulation and an experiment are consistent with each other,which validates the effectiveness of the model and the method. The underwater nonlinear buckling behaviors of an underwater shell made of four kinds of materials,including aluminum,carbon / epoxy,boron / epoxy and glass / epoxy,were contrasted. The results show that the tensile modulus of fibers have great impact on the pressure capacity of the cylindrical shell. Carbon / epoxy is an ideal material for cylindrical shells subjected to hydrostatic pressure. Finally,the underwater nonlinear buckling behaviors of stiffened composite cylindrical underwater shells with different shaped ribs,such as rectanglar,T-shaped,and Lshaped ribs,were studied. The results show that the T-shaped ribs are best for improving the buckling pressure of cylindrical shells. The results of this paper have an important reference value and guidance function for underwater application and study of composite materials.