叶片受不同软体外物撞击的瞬态响应分析  

Dynamic responses of the blades due to different soft body impacts

作　　者：尹冬梅[1] 徐亚栋[2] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094 [2]南京理工大学机械工程学院,江苏南京210094

出　　处：《兵器材料科学与工程》2011年第3期33-37,共5页Ordnance Material Science and Engineering

摘　　要：发动机叶片常遭受外物的撞击损伤,不同材料的外物撞击损伤存在着差别。采用弹性应力波的传播和基本流体动力学的原理分析超弹性软体和塑性软体外物撞击叶片时的撞击载荷模型。通过在LS-DYNA中就超弹性软体(以橡胶为例)和塑性软体(以明胶为例)外物对叶片的撞击过程进行数值仿真分析。结果表明:在相同的初始撞击能量、相同的撞击速度及相同的撞击入射角度下,橡胶撞击叶片时的撞击接触力幅值较大,但持续时间较明胶撞击时的要短,叶片中的等效应力水平比明胶撞击时的高,故更容易使叶片产生损伤;随着初始撞击速度的增加,橡胶发生碎裂,某些撞击特性与明胶的趋于相近。Foreign object damage （FOD） often occurs while engine blades are working. The damage due to different foreign object impacting is different. The elastic stress wave propagation and the fundamental hydrodynamics are respectively used to analyse the impact load for hyperelastic soft body and plastic soft body impacting on the blades. Numerical simulations of hyperelastic soft body and plastic soft body impacting on the blades were done in the LS-DYNA. Rubber and gelatine were respectively used as hyperelastic soft body and plastic soft body in the simulations. The results suggest that the amplitude value of the impact contact force for rubber impacting is bigger than the one for gelatine impacting with the same initial impacting energy and the same impacting velocity and the same impacting angle. But its duration is shorter than the one for gelatine impacting. Effective stress in the blade due to rubber impacting is bigger than the one due to gelatine impacting. And it will cause damage for blade more easily. The rubber is fragmented with the initial impacting velocity increasing, and some impacting characteristics of the rubber begin to be similar to the ones of the gelatine.

关 键 词：叶片 数值分析 外物损伤 软体 接触-撞击 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]