旋翼复合材料桨叶弹击损伤的有限元仿真分析

FINITE ELEMENT SIMULATION ANALYSIS OF ROTOR COMPOSITE BLADE DAMAGE UNDER BULLET IMPACT

为研究旋翼复合材料桨叶在高速弹击情况下的损伤情况,本文通过有限元方法,对直升机复合材料桨叶翼型段的弹击损伤进行了仿真分析。建立了复合材料桨叶翼型段的有限元分析模型,采用在三维Hashin失效准则的基础上修改的编织布失效准则对桨叶中的复合材料单元的弹击损伤进行判断,基于ABAQUS软件编写了VUMAT材料子程序,并按照损伤形式对损伤单元的刚度进行折减。计算结果和试验结果的对比分析表明:仿真分析结果和试验结果具有良好的一致性,可见通过数值仿真可以直观地分析桨叶的弹击损伤,预测损伤范围,为桨叶结构的抗弹击设计和评价提供依据。

In order to investigate the damage of helicopter rotor blade under high speed bullet hitting,the FEM was used to analyze the rotor blade impact damage.The finite element model of composite blade is built based on ABAQUS,applying the 3D composite failure criterion based Hashin criteria to judge the ballistic damage and stiffness reduction.Through the FEM simulation results,the ballistic damage of the blade can be observed visually.Compared with the experimental results,the accuracy and validity of the results are proved.The simulation analysis of the blade ballistic under different conditions is carried out,which can predict the blade ballistic damage and provide some reference for the against-ballistic design of blade structure.