摘要
对低速冲击作用下直升机复合材料波纹梁的吸能能力进行数值模拟分析。在分析中摒弃了在已有分析中将层合板复合材料简化成理想弹塑性材料的假设,建立了考虑实际铺层结构的复合材料波纹梁的有限元分析模型。采用Hashin失效准则对层合板单元的损伤进行判断,并按照相应的损伤形式对单元刚度进行了相应的折减。基于ABAQUS软件编写了VUMAT材料子程序,实现层合板单元的损伤判定和失效单元的刚度折减。计算结果和试验结果的对比分析结果表明,有限元模拟与试验结果有着良好的一致性,验证了分析方法的有效性。
The energy absorption capability of helicopter composite waved beams were analyzed in action by low velocity impact. Abandon hypothesis which in the analysis of composite material laminated board was predigested to the ideal elastic- plastic material assumption,and set up to a finite element analysis model considered the actual corrugated layer structure of composite waved beams.Using Hashin failure criteria,judged laminated plate element damage,and in accordance with the corresponding damage form to correspond to element stiffness. Based on ABAQUS software written a VUMAT material subprogram to come true damage judgment of laminated plate element and stiffness reduction of failure unit. The results from calculation results and experiment results contrast indicated that finite element simulation be well in accord with experiment results,this validate the analyse measures in well work.
出处
《直升机技术》
2015年第1期25-28,38,共5页
Helicopter Technique
关键词
复合材料结构
耐撞性
损伤演化
数值模拟
composite structure
crashworthness
damage evolvement
numerical simulation
