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丁羟包覆层力学特性及本构模型研究 总被引:1,自引:0,他引:1
包履层是固体火箭发动机装药的重要组成部分,其力学行为影响着装药结构的完整性。为研究丁羟橡胶包覆层的拉伸力学性能,采用单轴拉伸实验方法拟合获取了Neo-Hookean、Yeoh、Mooney-Rivlin及Ogden超弹性本构模型的本构参数,对比分析了各模型对丁羟橡胶包覆层的适用性和精度。结果表明:丁羟橡胶包覆层具有显著的超弹特性,Neo-Hookean模型难以预示有限变形下丁羟包覆层的非线性特性,Yeoh模型可反映较大应变时的力学行为,而Mooney-Rivlin和Ogden模型可准确描述丁羟包覆层的力学特性,可应用于药柱/包覆层结构完整性的分析。 相似文献
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Interface debonding between particle and matrix in composite propellant influences its macroscopic mechanical properties greatly. For this, the laws of interface cohesive damage and failure were analyzed. Then, its microscopic computational model was established. The interface mechanical response was modeled by the bilinear cohesive zone model. The effects of interface properties and particle sizes on the macroscopic mechanical behavior were investigated. Numerical simulation of debonding damage evolution of composite propellant under finite deformation was carried out. The debonding damage nucleation, propagation mechanism and non-uniform distribution of microscopic stress-strain fields were discussed. The results show that the finite element simulation method based on microstructure model can effectively predict the trend of macroscopic mechanical behavior and particle/matrix debonding evolution process. It can be used for damage simulation and failure assessment of composite propellants. 相似文献
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