• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (6): 129-137.doi: 10.3901/JME.2019.06.129

• 运载工程 • 上一篇    下一篇

基于参数映射的玻纤增强PMH结构数值方法

聂昕, 雷发桂, 朱国华, 汪冬冬, 熊东箭   

  1. 湖南大学汽车车身先进设计制造国家重点实验室 长沙 410082
  • 收稿日期:2018-03-26 修回日期:2018-09-14 出版日期:2019-03-20 发布日期:2019-03-20
  • 作者简介:聂昕,男,1982年出生,博士,助理研究员。主要研究方向为汽车车身工艺、汽车车身结构优化及质量控制。E-mail:niexinpiero@163.com;雷发桂,男,1989年出生,硕士研究生。主要研究方向为汽车新材料、新结构和新工艺。E-mail:18390877786@163.com
  • 基金资助:
    国家自然科学基金(61232014)、广西区科技计划(桂科攻1348005-1,桂科攻14122005-7)和中央高校基本科研业务费专项资金资助项目。

Numerical Methods of Glass Fiber Reinforced PMH Structure Based on Parameter Mapping

NIE Xin, LEI Fagui, ZHU Guohua, WANG Dongdong, XIONG Dongjian   

  1. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082
  • Received:2018-03-26 Revised:2018-09-14 Online:2019-03-20 Published:2019-03-20

摘要: 针对传统数值分析方法对于注塑成型的长纤维增强聚合物-金属混杂(Polymer metal hybrid,PMH)结构存在的缺陷,提出一种基于材料参数映射的全新数值仿真方法。采用多重连续介质理论(Multiple continuum theory,MCT),将微观代表性体积元(Representative elemental volume,RVE)中的复合平均参数转化到各组分(纤维增强体和基体)上,通过各组分平均参数变化来预测复合材料的损坏演变和失效,无须建立反映实际的微观机械应力场模型。基于此材料参数模型,将模流分析得到的纤维取向和残余应力信息与材料的拉伸试验数据进行拟合,得到结构分析模型所需的纤维、基体的弹塑性参数,最后将上述参数结果映射到结构分析模型中。该方法很好地将模流分析得到的大量分析数据映射到结构分析模型中,实现更准确、高效的结构数值分析。基于这种方法,对车身典型PMH大梁结构进行研究,探究金属-聚合物界面粘接层粘接强度对残余应力、翘曲收缩变形及在标准工况下对整车各力学性能的影响,研究表明:当界面粘接强度大于20 MPa后,PMH结构件的翘曲收缩变形量趋于一个较小的稳定值,各典型工况下力学性能不会发生折损。

关键词: MTC理论, PMH结构, 参数映射, 注塑成型

Abstract: A new numerical simulation method based on material parameter mapping is proposed for the defect of traditional numerical analysis of long fiber reinforced plastic metal hybrid(PMH) structures for injection molding. Based on the multiple continuum theory (MTC), the compound mean parameters in the microscopic representative volume element(RVE) is transformed into its internal components (fibers and matrix), through the relationship change between the mean parameters of components to predict the damage evolution and failure of the composite, to avoid the establishment of the complex actual micro-mechanical stress model. Based on the mentioned above model, the fiber orientation and residual stress information obtained by the flow analysis were fitted with the tensile experimental data of the material to obtain the elastic and plastic parameters of the fiber and matrix needed for the structural analysis model. Finally, the above information were mapped to the structural analysis model. This method can map a large number of analytical data from the flow analysis model to the structural analysis model, so as to realize more accurate and efficient structural numerical analysis. Based on this method, the effect of the bonding strength of metal-plastic interface adhesive layer on the residual stress, the warpage and contraction deformation and the mechanical properties under the typical working condition of the vehicle is studied. The results show that the warpage and contraction deformation of the plastic parts is negligible when the bonding strength of the interface is greater than 20 MPa, the mechanical properties of the PMH structure are not be damaged under typical operating conditions.

Key words: injection molding, MTC theory, parameter mapping, PMH structure

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