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将复合材料弹性参数偏轴转换理论引入Hedgepeth细化模型,使模型应用范围拓展到倾斜切缝。进而应用Griffith能量理论,并结合试验现象,针对倾斜切缝模型推导了蒙皮材料抗撕裂强度公式。由理论结果可知,蒙皮材料的抗撕裂强度与材料的内因(弹性参数、纱线编织密度等)及外因(切缝倾角、切缝长度等)有关,是由膜材材料性质及损伤参数共同决定的。通过与其他撕裂强度理论及试验结果进行对比分析,验证了所推导理论及所得结论的正确性。所得结论可为蒙皮材料的强度设计及飞艇结构的安全性评估提供理论参考。
The theory of off-axis transformation of composite elastic parameters was introduced into the Hedgepeth refinement model to extend the application of the model to oblique slits. Based on Griffith energy theory, combined with the experimental phenomena, the formula of tear strength of skin material was deduced for the oblique kerf model. The theoretical results show that the tear strength of the skin material is related to the material’s internal factors (elastic parameters, yarn weaving density, etc.) and external factors (cutting angle, kerf length, etc.) and is determined by the material properties and damage parameters Common decision. By comparing with other tearing strength theory and test results, the correctness of the deduced theory and the conclusions obtained are verified. The conclusion can provide a theoretical reference for the strength design of the skin material and the safety evaluation of the airship structure.