锻压技术

Ti-6Al-4V钛合金型材电热拉弯成形极限仿真方法

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

作者：刘天骄王永军杨凯田鹤飞孔文超

分类号：V262.3; TG386.4

出版年,卷(期):页码：2017,42(4):117-122

摘要：

针对电加热拉弯成形工艺，建立了电热拉弯过程顺序耦合的数值模拟方法，实现了电热转台式拉弯成形过程的多工序、多场耦合数值模拟。并选用动力显式热-力耦合分析算法，基于J-C断裂准则，建立了电热拉弯成形极限与断裂预测的三维实体模型。通过Ti-6Al-4V钛合金挤压T型材电热拉弯成形试验与仿真预测结果比较发现：电热拉弯成形过程中，材料的失效主要发生在预拉伸和补拉伸阶段，失效原因为拉伸力过大；电热拉弯成形极限的主要影响因素包括加热温度或电流密度、预拉力、补拉伸过程温度或冷却时间和补拉力；预拉伸和补拉伸极限应力的预测相对误差分别为19.7%和19.1%，验证了模型的有效性。

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.

基金项目：

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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