Constitutive Structure and Milling Surface Quality Prediction of TA11 Titanium Alloy
The work aims to find out the influence of different milling parameters on the surface quality of TA1 1 titanium alloy,and establish a surface roughness prediction model based on milling parameters,so as to predict the milling surface quali-ty of TA11 titanium alloy.A rate-dependent JC constitutive model of TA11 titanium alloy was established by tensile tests of TA11 titanium alloy at room temperature under different strain rates,and a finite element model of milling process was estab-lished based on this model.The accuracy of finite element simulation was verified by comparing with the experiment.Through orthogonal experimental design and single factor analysis,the evolution law of surface roughness of TA 11 titanium alloy under different milling parameter combinations was expounded.Finally,based on multiple linear regression method,a surface roughness prediction model based on milling parameters was established.A JC constitutive model and a damage model were established respectively,which could reflect the stress-strain behavior and damage behavior of TA 11 titanium alloy under different strain rates.The predicted results were in good agreement with the experimental results.When the milling speed was 5 300 r/min,the feed per tooth was 0.04 mm/z,the milling depth was 1 mm,and the milling width was 0.2 mm,the error rate between the finite element simulation results and the experimental results was 11.83％;R2=0.963,P＜0.001,the fitting de-gree of the model was high and had statistical significance.In conclusion,the established JC constitutive model and damage model can well describe the deformation behavior and damage evolution process of TA1 1 titanium alloy under different strain rates,and the finite element simulation of milling process based on this model can reflect the influence of milling parameters on the surface roughness of TA11 titanium alloy.The established surface roughness prediction model can provide some engineering guidance for the formulation of TA11 titanium alloy milling process scheme.
TA11 titanium alloysurface roughnessJC constitutive modelfinite element simulationorthogonal testfore-casting model
万方数据
维普
