轿车用铝合金焊接接头局部力学性能分析

Investigation on the local mechanical properties of the automobile aluminium alloy welded joint

铝合金焊接接头是一个组织和力学性能不均匀体,准确测定不同区域的局部力学性能,对评定接头整体性能和改善焊接工艺是十分必要的.通过对轿车用5052铝合金焊接接头显微组织及硬度分析,提出了微冲压试验方法,结合ABAQUS有限元商业软件对接头局部力学性能进行了研究.在有限元反向模拟计算间接得出局部材料的本构关系,同时利用拉伸试验验证该方法的准确性.结果表明,焊接接头局部力学性能分布特征与硬度值分布特征基本相似,熔合线附近是焊接接头力学性能最薄弱的区域.

Because the micro structures and mechanical properties were nonuniform in the aluminium alloy welded joint, it was necessary that the local mechanical properties was measured accurately for the assessment of the mechanical properties of whole welded joint and the improvement of the welded technique. In this paper, the micro structures and hardness of the automobile 5052 aluminium alloy were analyzed, at the same time, the small ball punch test was put forward to investigate the local mechanical properties o...