Simulation and Experimental Study on Chip Morphology and Residual Stress in Cutting of Titanium Alloy
As a common material in the aviation industry,the residual stresses of titanium alloy after machining can seriously affect the service life of the components.In this study,a finite element model based on the Coupled Eulerian-Lagrangian(CEL)method in the machining of titanium alloy was established,and the orthogonal experimental platform was used to obtain the chip morphology and residual stresses to verify the validity of the model.The present model was compared with the traditional Lagrangian and Arbitrary Lagrange-Eulerian(ALE)methods,the results show that although the CEL method takes a long time,the prediction results are more accurate without mesh distortion and have the best comprehensive performance.Finally,the present method was used to investigate the chip morphology and residual stresses on the machined surface under the different feeds and edge radius.The results show that the degree of chip serration and equivalent chip thickness increase with the increasing of feed and edge radius,and the residual stresses of surface become more compressive.