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对短切芳纶纤维EPDM材料试件进行了拉伸试验,利用数字图像分析法处理得到了准确的材料应力应变数据。根据火箭发动机柔性隔层的结构特点,用ABAQUS有限元分析软件建立了柔性隔层的有限元模型,利用轴对称结构大大简化了计算量。通过ABAQUS对拉伸试验数据进行拟合,得到了较为准确的超弹性本构模型,并通过此模型对隔层工作情况进行模拟,得到了隔层的实际应变情况。结果表明,当前工况下柔性隔层受载未超出材料强度极限,且尚具有较高的安全裕度,现有的安全判据是不可用的。改变壳体刚度、隔层与药住间隙计算其应变结果,并综合对比之前的结果,提出了有效的降低隔层应变方法,为隔层的优化提供了依据。
Tensile tests were conducted on the EPDM specimens of chopped aramid fibers. Accurate material stress-strain data were obtained by digital image analysis. According to the structural characteristics of rocket motor flexible barrier, a finite element model of flexible barrier was established by using ABAQUS finite element analysis software. The axial symmetry structure greatly simplified the calculation. Fitting the tensile test data by ABAQUS, a more accurate hyperelastic constitutive model was obtained, and the working condition of the compartment was simulated by this model, and the actual strain of the compartment was obtained. The results show that the current safety criterion is not available under the current conditions that the flexible barrier is under load without exceeding the material strength limit and still has a high safety margin. Changing the stiffness of the shell, calculating the strain of the shell and the gap between the shell and the drug, and comparing the previous results, we put forward an effective method to reduce the strain of the shell and provide the basis for the optimization of the shell.