1. School of Materials and Engineering, Jiangsu University of Technology,Changzhou 213001, China
2. Chongqing Innovation Center, Northwestern Polytechnical University,Chongqing 401135, China
et al.
In this study，numerical simulations on the hydraulic forming process of TA2 pure titanium T-junction were conducted, using the commonly used Mises yield criterion and the CPB06 yield criterion respectively, and the simulated results were compared and analyzed. The microstructure results indicate that pure titanium tubes have obvious tilted basal texture. At the same time, due to the limited number of intrinsic slip systems, there are mechanical characteristics such as tension-compression asymmetry, strong anisotropy, and significant distortion strengthening effect. This makes the Mises yield criterion difficult to apply, and the simulation results deviate significantly from the actual forming process, especially with the occurrence of branch collapse that does not conform to engineering practice. The CPB06 yield criterion, however, can correctly describe the material flow behavior of pure titanium during the Tjunction forming process due to the consideration of tension-compression asymmetry and anisotropic hardening. The simulation results are in good agreement with experimental results. By employing the established finite element model based on CPB06 yield criterion, it is possible to analyze and predict the evolution of the physical fields and forming defects in the pure titanium T-junction forming process, providing theoretical support for process optimization and failure analysis.