叶片砂石撞击损伤的数值模拟与分析

Simulation and Analysis of Blades Damaged by Sandstone

航空发动机叶片常受到被吸入的砂石等外物的撞击而产生损伤。针对这一问题,该文采用非线性瞬态动力学软件LS-DYNA中的接触冲击算法,对航空发动机叶片的砂石撞击的瞬态响应进行了数值分析。研究了不同的撞击位置及撞击速度对叶片瞬态响应及损伤的影响。结果表明:外物撞击速度越大,接触撞击力就越大,对叶片的损伤也越大;撞击位置越接近叶片尖部,叶根处的塑性硬化越强。该文结果对于进行叶片抗外物撞击研究,尤其是硬体外物的损伤研究具有参考价值。

The ingestion of such foreign objects as sandstones into aircraft engines can often do damage to the aeroengine blades. The transient response of aeroengine blades under sandstone impact loads is analyzed with the contact-impact finite element method in LS-DYNA by numerical simulation. The impacting effects under different locations and speeds on the transient response and damage of blades are analyzed. The higher the impact velocity is, the bigger the impacting contact force is, and the greater the damage to the blades is. The plastic hardening of the heel of blades is enhanced with the impacting location closer to the top of blades. The result offers an important reference for the investigation of anti-impacting damage of aeroengine blades under foreign object damage, especially for the research of hard foreign object damage of blades.