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对某浮空器蒙皮用柔性复合材料的撕裂性能和顶破性能进行了实验研究和数值分析。通过不同切口宽度和总宽度试样的撕裂实验,发现撕裂过程为典型的脆性断裂特征,根据线弹性断裂模型对撕裂过程进行数值模拟得到与实验结果一致的断裂过程,通过数值计算得到扩展过程中裂纹尖端的应力强度因子,计算得到的撕裂承载能力随相对切口宽度增加而降低,与实验结果一致。对不同直径试样进行顶破实验,并以断裂应变为裂纹临界扩展的断裂模型进行数值分析,得到顶破模拟结果与实验结果一致:使顶破位置达到相同的断裂应变值,大直径试样需要较大的位移值,失效时圆心位置的应力水平保持不变使得最大顶破承载水平保持不变。
The experimental research and numerical analysis of the tearing performance and the bursting performance of a composite aerocraft using a flexible composite were carried out. According to the tearing experiments of different widths and widths of specimens, it is found that the tearing process is a typical brittle fracture. According to the linear elastic fracture model, the tearing process is numerically simulated and the fracture process consistent with the experimental results is obtained. The stress intensity factor at the crack tip during the expansion process and the calculated tear bearing capacity decrease with the increase of the relative kerf width, which is consistent with the experimental results. The test of different diameter specimens is carried out, and the fracture model with fracture strain as the critical crack propagation is numerically analyzed. The results of the test are consistent with those of the experimental results. The same fracture strain value is obtained at the bursting position. The large diameter specimen Need a larger displacement value, the failure of the center of the stress level remains unchanged so that the maximum top load level remains unchanged.