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通过有限元数值模拟方法和力学性能试验研究5052铝合金自冲铆接头接触界面处的微动滑移特性和演变过程。搭建显微测量平台,设计双半剖自冲铆接头试样,并进行单向拉伸剪切试验和数值模拟。结果表明:自冲铆接头接触界面处存在微动滑移现象;拉伸剪切状态下的试验结果和数值模拟结果吻合较好,且最大应力分布在铆钉腿底部与下板接触位置及铆钉与下板自锁处。双半剖模型可定性地描述自冲铆接头的微动滑移特性,并可作为接头机械内锁区域滑移错动量的检测模型。
The micro-slip characteristics and evolution of the 5052 aluminum alloy self-piercing riveted joint at the contact interface were studied by means of finite element numerical simulation and mechanical tests. A microscopic measuring platform was set up to design double half-section self-piercing riveted joint specimens. Uniaxial tensile shear tests and numerical simulation were carried out. The results show that there is a fretting slip phenomenon at the contact interface of the self-piercing riveted joint. The experimental results in the tensile shear state agree well with the numerical simulation results, and the maximum stress distribution in the contact position between the bottom of the rivet leg and the lower plate and the rivets Under the plate from the lock. The dual half-section model can qualitatively describe the fretting slip characteristics of self-piercing riveted joints and can be used as the detection model for the slip mis-quantity of the interlocking mechanical interlocking area.