Transactions of Materials and Heat Treatment

Title：FEM of forming limit in electric-thermal stretch bending for Ti-6Al-4V titanium alloy profile

Authors： Liu Tianjiao Wang Yongjun Yang Kai Tian Hefei Kong Wenchao

Unit： Kunming Shipbuilding Equipment Research Test Center Northwestern Polytechnical University

KeyWords： Ti-6Al-4V titanium alloy electric-thermal stretch bending forming limit fracture prediction pre-stretching post-stretching numerical simulation

ClassificationCode：V262.3; TG386.4

year,vol(issue):pagenumber：2017,42(4):117-122

Abstract：

For the electric-thermal stretch bending of titanium alloy, a numerical simulation method of sequential coupling of electro-thermal stretch bending process was established, and a multi-process and multi-field coupling numerical simulation process of electro-thermal stretch bending with turntable was realized. Then, the dynamic explicit thermal-mechanical coupling analysis algorithm was selected based on J-C fracture criteria, and a 3D model predicting the forming limit and fracture of electro-thermal stretch bending was built. Comparing the experimental result with simulation result of extrusion T-type profile for Ti-6Al-4V titanium alloy, it is found that the failure of material in the electric-thermal stretch bending process is mainly because of the excessive tensile force on the pre-stretching and post-stretching stages. Therefore, the main factors influencing on the forming limit of electric-thermal stretch bending are the heating temperature or current density, the pre-stretching force, the temperature or cooling time of the post-stretching process and the post-stretching force. Furthermore, the predicted relative errors of limit stress for the pre-stretching and post-tensioning are 19.7% and 19.1% respectively, and the effectiveness of model is verified.

Funds：

国家自然科学基金资助项目（51275420）；航空科学基金资助项目（2008ZE53037）

刘天骄（1988-），男，博士，工程师 E-mail：nwpuliutianjiao@163.com

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