Abstract

In this study, electromagnetic riveting (EMR) was proposed to connect CFRP/Al structures due to its little damage on composite. The joining process and failure behaviors of CFRP/Al joints were studied. Specifically, the finite element model was established to analyze the joining process. The riveted joints were tested under various loading velocities to obtain the failure behaviors. The simulation results showed that hole wall of the CFRP and Al sheets had uniform residual stresses, and no damage of the CFRP sheet was observed around the hole after EMR, indicating that the joint had superior performance. The tensile test results showed that the loading speed had a great influence on the performance of the joint. The maximum shear force at lower loading speeds was less than that at higher loading speeds, while the trend of energy absorption was opposite. The main failure position was in CFRP with a mix mode of bearing and shear out. Based on the failure analysis, a simplified analytical model for the maximum shear load was presented.

摘要

在这项研究中，电磁铆接 (EMR) 被提议用于连接 CFRP/Al 结构，因为它对复合材料的损伤很小。研究了CFRP/Al接头的连接过程和失效行为。具体而言，建立了有限元模型来分析接合过程。铆接接头在不同的加载速度下进行测试以获得失效行为。仿真结果表明，CFRP和Al板孔壁残余应力均匀，EMR后孔周围CFRP板无损伤，表明接头性能优越。拉伸试验结果表明，加载速度对接头性能有很大影响。较低加载速度下的最大剪切力小于较高加载速度下的最大剪切力，而能量吸收的趋势则相反。主要失效位置在 CFRP 中，具有承载和剪切的混合模式。在失效分析的基础上，提出了最大剪切载荷的简化分析模型。