锻压技术

附加几何形貌特征对Steel/CFRP无铆连接接头性能的影响

英文标题：Influence of additional geometrical features on performance of Steel/CFRP joints fabricated by mechanical clinching

作者：郭玉琴翟长盼李富柱倪俊杨艳

单位：江苏大学

关键词：Steel/CFRP 接头附加几何形貌无铆连接热冲压局部成形

分类号：TG386.44

出版年,卷(期):页码：2017,42(10):155-161

摘要：

基于无铆连接技术，提出对钢板和碳纤维预浸料进行热冲压局部成形的Steel/CFRP连接工艺，设计了平板型及具有矩形凹槽、弧形凹槽、分布式圆柱形凹坑、分布式球形凹坑等几种不同附加几何形貌特征的Steel/CFRP连接接头。采用Hashin损伤准则及内聚力模型，通过系列有限元仿真实验，研究了有效粘结长度、不同附加几何形貌特征、尺寸及分布对接头性能的影响。仿真与拉伸剪切实验结果对比分析发现：仿真建模时所采用的理想结合界面假设，以及对胶黏剂性能、局部成形界面内应力重新分布的忽略，是造成仿真结果与实验结果出现较大出入的主要原因，可以通过对附加几何形貌特征参数和连接工艺条件优选，促使接头处形成理想的结合界面和机械镶嵌作用，以提高Steel/CFRP接头性能。

Based on the mechanical clinching technology, a Steel/CFRP joining process of local hot stamping forming was proposed for Steel/CFRP hybrid materials, and the Steel/CFRP joint of plain type and Steel/CFRP joints with additional geometrical features such as rectangular grooves, arc grooves, distributed cylindrical dents and distributed hemispherical dents etc. were designed. Then, the influences of effective bond length, various additional geometrical features, dimensions and distributions on Steel/CFRP joint performance were studied by the Hashin damage criteria, cohesive model and a series of CAE simulation tests. Comparing the simulation results with the tension shearing tests, the large error was mainly caused by the ideal interface hypothesis used in CAE models, the ignored adhesive properties and the stress redistribution of interfaces locally formed. Thus, the Steel/CFRP joint performance could be improved by optimizing the parameters of additional geometrical features and the conditions of joining process to promote the production of an ideal bonding interface and mechanical interlocking on Steel/CFRP joints.

基金项目：

国家自然科学基金资助项目(51575245)；江苏省“六大人才高峰”资助项目(XNYQC-002)；江苏大学青年科技扶持基金项目（FCJJ2015010）；江苏大学高级人才启动基金项目（16JDG038）

作者简介：郭玉琴（1974-），女，博士，教授，E-mail：367047306@qq.com

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