航空发动机用蜂窝材料应变率相关本构模型及应用研究

Application of Strain-Rate-Dependent Material Models to Aero-Engine Honeycomb Casing Analysis

针对典型航空发动机涡轮机匣防叶片刮磨的蜂窝材料,阐述了常用的蜂窝等效模型和J-C(Johnson-Cook)模型,将两种材料模型应用于蜂窝冲击试验的仿真分析,并与试验结果进行了对比.结果表明,通过合理的参数标定及简化假设,J-C模型可提供满意的仿真结果,其中蜂窝损伤预测与试验结果很好地吻合.鉴于其使用相对简单,同时能够提供足够的预测精度,在航空发动机叶片与蜂窝的刮磨仿真分析工程应用中值得推荐.

For typical honeycomb materials used in turbine casings of aero-engines to prevent blades from scraping the casing,2 commonly used material models,the Johnson-Cook model and the honeycomb equivalent model,and the relevant calibration methods were discussed. Then the 2 models were implemented in the simulation of a honeycomb impact test,and the simulation results were compared with the test results. It is shown that,through appropriate parameter calibrations and reasonable simplifications,the Johnson-Cook model provides satisfying results,in which the damage prediction is in good agreement with the test observation. Since the Johnson-Cook model is relatively easier to be implemented with enough prediction accuracy,it is recommended for blade-honeycomb scraping analysis of aero-engines.