不同应变率下叶片的瞬态响应分析

Numerical Analysis of the Transient Responses of Bladesunder Different Strain Rates Due to Bird Impact

鸟与航空发动机叶片相撞时，叶片的是在高应变率下变形的。由于材料的性能随应变率的变化发生变化，因此在计算叶片的瞬态响应时，应当考虑这一材料性能的变化的影响。本文分析了不同应变率下鸟正撞击时模型叶片的瞬态响应。结果表明，在高应变率下，叶片的弯曲变形与局部变形都偏小；叶片受撞结束后的振动周期增大。

When the birds strike on the aeroengine, the deformations of the blades are usually occoured under the high strain rates. Because the performance of material is changed with the alternation of the strain rates, it is necessery to consider this change in the calculation of the transient responses of the baldes. In this paper, the transient response of blades is calculated under two different strain rates by using a model blade. The results show that the twist deformation and the local deformation are small and time period of blade vibration becames large in high strain rates condition.