Author(s): YANG Yong, ZHU Wei-wei, LI Ming
Pages: 1259-1267
Year: 2014 Issue:  5
Journal: The Chinese Journal of Nonferrous Metals
Keyword:  titanium alloy; cutting process; orthogonal cutting theory; constitutive model;
Abstract: To make up the shortcoming of the current researches in material constitutive model during cutting process, a construction method of material constitutive model based on orthogonal cutting theory was presented. According to the orthonal cutting theory, the mathematic model of stress, strain, strain rate and temperature in shear zone, as well as the two-dimensional cutting force, was established. The constrution technology of material constitutive model by taking the ratio of length to depth in shear zone as an iterative variable was developed. With the split Hopkinson pressure bar (SHPB) compression experiment and orthogonal cutting experiment, the material deformation physical quantities were solved and the material constitutive model was established. The prediction values of material constitutive model were compared with the cutting experiment ones, and they are found to be in good agreement. The results show that titanium alloy material has obvious strain hardening characteristic, temperature sensitivity characteristic and strain rate sensitivity characteristic during cutting process. And with the increase of strain rate, the flow stress increment decreases, and the strain rate sensitivity characteristic decreases.