单元尺寸对复合材料层压板蒙皮鸟撞模拟的影响分析

通过仿真与试验的对比分析,分析结构单元尺寸对飞机尾翼复合材料蒙皮鸟撞模拟精度的影响。基于PAM-CRASH软件,用光滑粒子流体动力学方法建立适航条例所规定鸟体结构模型,用二维壳单元模拟层压板结构,通过试算计算出多种单元尺寸下结构破损的临界速度。结果表明,在层压板不发生破损的情况下,单元尺寸对位移计算结果影响很小;临界破损速度的计算值随着单元尺寸的增大而增大;当层压板单元尺寸为5 mm时,临界破损速度和应变响应与实测结果吻合最好。

Influence of Element Size on the Simulation of Bird Strike of Composite Laminate Skin

The influence of element size on the numerical simulation of bird strike of the composite skin of the tail wing is studied based on the test data. The bird body is modeled using the smoothed particle hydrodynamics (SPH) based on finite element code PAM-CRASH. The composite laminate plate is modeled with 2-D shell element. The results show that, the element size barely influence the displacement response if no damage is inflicted; the critical impact velocity increases with the element size; the critical impact velocity predicted with model with element length of 5mm is best, and the strain responses also agree with the measurement ones well.