基于热力耦合的磨削残余应力仿真与试验研究

摘要

Based on the grinding experiments of hardened bearing steel GCr15 ,the grinding surface residual stress was measured by X‐ray diffractometry . A finite element model of surface grinding was built according to the thermal elastic‐plastic theory and Johnson‐Cook plastic models .The influences of different moving heat source models on the simulation results of residual stress were studied .The results show that heat source models have no significant effect on the depth of the tensile residual stress ,and the computed residual stress using elliptical heat source model is found to agree best with experimental results .%基于淬硬轴承钢GC r15平面磨削试验，通过X射线衍射法对磨削表面残余应力进行测量。依据热弹塑性理论和Johnson‐Cook塑性模型，建立了平面磨削有限元模型，研究了不同移动热源模型对磨削残余应力仿真结果的影响。结果表明，不同的热源模型对残余拉应力层的深度无显著影响，椭圆热源模型计算的残余应力与实验测量值最为吻合。