沙粒对飞机发动机叶片的冲击碰撞

研究沙粒与飞机发动机叶片的冲击碰撞,并将飞机发动机叶片模拟为横观各向同性材料,建立了横观各向同性叶片受沙粒垂直冲击碰撞时产生的永久性凹坑深度和反弹系数的解析表达式.数值分析结果表明材料沿冲击方向的泊松比及剪切模量越大,则凹坑深度越深.凹坑深度随着沿冲击方向的杨氏模量的增大会减小,达到一临界值后又逐渐增大,这为设计飞机发动机的抗冲击横观各向同性叶片提供了理论基础.

The Impact of Sand on the Blades of Airplane Engines

In order to study the impacts of sand on the airplane engine blades, a theoretic model of permanent notch and rebound coefficient is established by simulating engine blades with transversely isotropic material. The numerical result shows that the permanent notch becomes deeper and the rebound coefficient becomes less when the values of Poisson ratio and shear modulus along the impact direction increase. But the permanent notch will become shallower and then become deeper when the values of the Young modulus along the impact direction increase. A theoretic fundamental analysis is given for the design of engine blades of transversely isotropic material to sustain the impacts.