Transactions of Materials and Heat Treatment

Title：Fillet filling law and multi-field coupling numerical simulation of Ti55 titanium alloy pipe in electric assisted heating bulging

Authors： Zhang Yuxiang Tang Zejun Xu Aijun Di Xudong Hui Pengcheng Wang Zihan

Unit： Nanjing University of Aeronautics and Astronautics Beijing Satellite Manufacturing Co. Ltd.

KeyWords： Ti55 titanium alloy electric assisted heating fillet filling multi-field coupling bulging

ClassificationCode：TG316

year,vol(issue):pagenumber：2021,46(4):112-120

Abstract：

The finite element model of electro-thermal-mechanical multi-field coupling for Ti55 titanium alloy pipe in the process of electric assisted heating bulging was established by simulation software ABAQUS and the indirect sequential coupling method, and the filling law of fillet for Ti55 titanium alloy pipe in the process of electric assisted heating bulging was studied by multi-field coupled finite element analysis and mechanical analysis. The results show that when the nodal current density of the model is 14 A·mm-2, the maximum thinning rate of wall thickness for pipe still appears in the transition zone. However, when the nodal current density increases to 15 A·mm-2 and the temperature at the fillet of pipe further increases to 750 ℃, the straight side part cools down because of sticking to die. According to the temperature distribution and mechanical analysis, the forming pressure in the transition zone is larger than the forming pressure at the fillet. Therefore, the maximum thinning rate of wall thickness for pipe is transferred from the transition zone to the fillet zone. Thus, the electric assisted heating bulging process greatly improves the degree of sticking to die at the right angle part of pipe, improves the forming accuracy of fillet filling for Ti55 titanium alloy pipe, solves the problem that the straight edge transition zone is the most easy to deform and crack before the fillet zone, and makes full use of material forming property.

Funds：

装备预研领域基金（61409230408）

张宇翔（1997-），男，硕士研究生 E-mail：2444280763@qq.com 通讯作者：汤泽军（1981-），男，博士，副教授 E-mail：zjtang@nuaa.edu.cn

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