Failure simulation and test verification of cone under impact load
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摘要: 根据航空发动机支承锥壁结构受力特点,对风扇叶片飞失冲击载荷作用下的锥壁失效破坏机理进行了研究。利用显式动力学有限元仿真方法,对冲击载荷作用下的锥壁结构动态失效过程进行了瞬态分析。开展了对锥壁的落锤冲击试验,并与分析结果进行了对比验证。试验和分析结果表明:冲击载荷作用下锥壁减薄处破坏为剪切失效破坏。采用的显式动力学有限元仿真方法为准确模拟冲击载荷作用下的锥壁结构失效提供了一种可行的仿真手段,分析获得的峰值加速度与试验结果误差小于5%;利用GISSMO(generalized incremental stress state dependent damage model)可以准确预测锥壁减薄处断裂时间、断裂位置。经过试验验证的分析方法及失效模型可运用到风扇叶片飞失冲击载荷下的锥壁失效设计参数的确定,提高锥壁降载结构设计的精度。Abstract: According to the load characteristics of aeroengine supporting cone structure, the failure mechanism of cone under the impact load of fan blade out was studied.By using the explicit dynamic finite element simulation method, transient analysis on the dynamic failure process of the cone structure under the impact load was carried out. The drop impact test of the cone was carried out, and the test results were compared with the analysis results. It was discovered that the failure of the cone thinning position under impact load was shear failure. The explicit dynamic finite element simulation method provided a feasible method for accurately simulating the failure of the cone failure under impact load, the error between the peak acceleration obtained by analysis and the test result was less than 5%. The GISSMO (generalized incremental stress state dependent damage model) can be used to accurately predict the fracture time and position at the cone thinning position.The analysis method and failure model verified by the test can be used to determine the failure design parameters of the cone under the impact load of fan blade out, so as to improve the accuracy of the load reducion design of the cone structure.
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Key words:
- impact load /
- fan blade out /
- cone /
- dynamic failure /
- explicit dynamics
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