考虑注射成型特性影响的汽车前端模块结构性能仿真

Structural performance simulation of automotive front end module considering influence of injection molding characteristics

利用Autodesk Helius PFA软件,将注射成型纤维取向张量和残余应力及应变分布等历史映射至前端模块的结构性能评价仿真。结果表明,注射成型纤维取向张量和残余应力及应变分布等成形历史影响前端模块的服役性能评价。与试验测试结果相比,映射和未映射注射成形历史的仿真最大位移均偏小。相比之下,映射注射成型纤维取向张量和残余应力及应变分布等成形历史的最大位移较大,且这种趋势随变形位移的增大而增大。当试验测试位移很小时,两种仿真方法的结果都与试验有较大的误差。当试验测试位移大于0.65 mm时,映射注射成型历史的百分误差Er、极差R和方差s2均较小,有利于指导玻璃纤维增强塑料车身结构的精准设计。

The history of fiber orientation tensor and residual stress and strain distribution in infection molding was mapped to the structural performance evaluation simulation of the front end module by using Autodesk Helius PFA software.The results show that the forming history,such as fiber orientation tensor and residual stress and strain distribution in injection molding,affects the service performance evaluation of the front end module.Compared with the test results,the simulated maximum displacement of the mapped and unmapped injection molding history is smaller.In contrast,the maximum displacement of forming history with mapped injection molding fiber orientation tensor and residual stress and strain distribution is larger,and this trend increases with the increase of the deformation displacement.When the tested displacement is very small,the results of the two kinds of simulation methods have large error from the test.When the tested displacement is greater than 0.65 mm,the percent error Er,range R and variance s2 of mapped injection molding history are small,which is conducive to guiding the precise design of the glass fiber reinforced plastic vehicle body structure.