The cryogenic machining technology can effectively improve the problems of high cutting temperature and poor machining quality in the titanium alloy machining process.However,the lack of cryogenic constitutive model of titani-um alloy restricts the further development of cryogenic machining technology of titanium alloy.This paper takes TA15 titani-um alloy as the research object,carries out cryogenic static tensile test,analyzes the cryogenic mechanical properties of TA15 alloy,constructs the cryogenic constitutive model of the alloy,and verifies the accuracy of the constitutive model based on the unequal shear zone theory.The results show that at low temperature,the strength of TA15 titanium alloy increases,the elongation and plasticity decrease,and the strengthening stage of the material is significantly shortened at-196℃.The comparison between the cutting force calculated by the constitutive model and the cutting force obtained by the test shows that the maximum error of the main cutting force is 22.34%,the minimum error is 0.48%,the maximum error of the feed force is26.32%,and the minimum error is1.43%.The modified Johnson-Cook constitutive model has high accuracy and can provide reference and guidance for the study of cryogenic machining mechanism of titanium alloys.
关键词
TA15/低温力学性能/本构模型/超低温加工/不等分剪切区
Key words
TA15/cryogenic mechanical properties/constitutive model/cryogenic machining/unequal devision shear zone
维普
万方数据