论文部分内容阅读
分析了在非预应力磨削及预拉应力磨削条件下工件表层残余应力的分布情况 .首先应用非线性瞬态有限元法计算了工件在移动热源作用下的温度场 ;然后应用热弹塑性有限单元法计算了工件在热作用和磨削力耦合作用下的残余应力分布 .计算结果表明预拉应力磨削能有效降低工件表层残余拉应力甚至可将残余拉应力转换为残余压应力 ,并分析了预应力磨削的作用机理 .计算结果与实验结果基本一致 .
The distribution of residual stress on the workpiece surface under non-prestressed grinding and pre-stressing grinding was analyzed.First, the temperature field of the workpiece under the action of moving heat source was calculated by using the nonlinear transient finite element method, and then the thermal elastoplasticity Finite element method is used to calculate the residual stress distribution of the workpiece under the coupling of thermal action and grinding force.The results show that the prestressing stress grinding can effectively reduce the residual tensile stress on the workpiece surface and even convert the residual tensile stress into residual compressive stress The mechanism of prestressing grinding is analyzed. The calculated results are in good agreement with the experimental results.