车轮残余应力测试方法研究

摘要

With the help of simulation analysis method, the change laws of saw kerf width and stress/strain near the kerf were studied when radial saw cutting. The analyses show that when the saw cutting depth reaches the joint of rim and plate, the release of residual stress is sufficient enough to calculate the residual stress on the tread based on release information of residual stress. On the basis of the radial saw cutting method, strain gauges were pasted near the kerf and record the strain change when saw cutting. The residual stress was calculated according to the strain change information.%采用仿真分析的方法研究了火车轮径向锯切过程中锯缝宽度的变化以及锯缝附近踏面上应力/应变的变化规律。分析表明,当锯切深度达到轮辋与辐板连接处时,锯缝附近残余应力的释放已经十分充分,可根据残余应力的释放情况计算踏面上残余应力的大小。按照径向锯切方法,在锯缝附近粘贴应变片,径向锯切到轮辋与辐板连接圆弧处时停止锯切,依据应变片记录的应变值可计算踏面上的残余应力。