基于CPB06准则的TA2三通液压成形数值模拟研究-中国材料进展

文章信息/Info

Title:: Numerical Simulation of Hydraulic Forming Process for TA2 Titanium T-Junction Based on CPB06 Criterion

作者:: 孙凌燕; 程亮; 郭海晶; 李若琳; 张志远; 杨超; 孙峰; 1. 江苏理工学院材料工程学院，江苏常州 213001 2. 西北工业大学重庆科创中心，重庆 401135 等。

Author(s):: SUN Lingyan; CHENG Liang; GUO Haijing; LI Ruolin; ZHANG Zhiyuan; YANG Chao; SUN Feng; 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.

Keywords:: pure titanium; T-junction; hydraulic forming; yield criterion; anisotropy; numerical simulation

摘要:: 针对TA2纯钛三通液压成形过程进行有限元数值模拟，分别采用米塞斯各向同性屈服准则和CPB06屈服准则，对结果进行了对比分析。组织分析结果表明，纯钛管材存在明显的倾转基面织构，同时由于本征滑移系数量过少，因此出现拉压不对称、各向异性强烈、扭曲强化效应显著等力学行为特征，导致常规的米塞斯屈服准则难以适用，模拟结果与实际成形过程相差过大，尤其是出现了不符合工程实际的支管崩溃现象。而CPB06屈服准则由于考虑了拉压不对称和各向异性硬化，因此能够准确描述纯钛在三通成形过程中的材料流动行为，模拟结果与实验结果吻合良好。采用所建立的基于CPB06屈服准则的有限元数值模型，能够对纯钛三通成形过程的物理场演变行为及成形缺陷进行分析预测，为工艺优化和失效分析提供理论支撑。

Abstract:: 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 Tjunction 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.