TA15钛合金应力松弛行为宏微耦合本构建模

doi:10.3901/JME.2022.12.064

机械工程学报 ›› 2022, Vol. 58 ›› Issue (12): 64-74.doi: 10.3901/JME.2022.12.064

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TA15钛合金应力松弛行为宏微耦合本构建模

陈源^1,2, 李淑慧^1,2, 李永丰^1,2, 林忠钦^1,2

1. 上海交通大学机械系统与振动国家重点实验室上海 200240;
2. 上海交通大学上海市复杂薄板结构数字化制造重点实验室上海 200240

收稿日期:2021-08-22 修回日期:2022-03-11 出版日期:2022-06-20 发布日期:2022-09-14
通讯作者: 林忠钦(通信作者),男,1957年出生,博士,教授,博士研究生导师。主要研究方向为薄板成形和装配工艺。E-mail:zqlin@sjtu.edu.cn
作者简介:陈源,男,1990年出生,博士研究生。主要研究方向为金属板件的热冲压工艺。E-mail:invisible29@sjtu.edu.cn;李淑慧,女,1973年出生,博士,教授,博士研究生导师。主要研究方向为金属薄板的塑性成形理论、工艺与装备技术。E-mail:lishuhui@sjtu.edu.cn
基金资助:
国家自然科学基金资助项目（51975366，52005329）

Macro-micro Coupled Constitutive Modeling for Stress Relaxation Behavior of TA15 Alloy Sheet

CHEN Yuan^1,2, LI Shuhui^1,2, LI Yongfeng^1,2, LIN Zhongqin^1,2

1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240;
2. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240

Received:2021-08-22 Revised:2022-03-11 Online:2022-06-20 Published:2022-09-14

摘要/Abstract

摘要： 钛合金热冲压是高温板料在室温模具中成形的非等温热成形工艺，其应力演化十分复杂，不仅和成形阶段高温塑性变形相关，还受保压阶段应力松弛的影响，进而影响最终的回弹。为精确预测钛合金热冲压过程中的应力松弛行为，亟需建立不同工艺条件下应力松弛的统一描述。针对钛合金TA15薄板，基于GLEEBLE热模拟试验机开展在温度550~850℃及不同初始应力条件下的应力松弛测试实验，发现钛合金TA15在高温条件下的应力松弛行为呈现短时快速的特征，初始应力主要影响应力松弛率，而温度影响应力释放的百分比。基于钛合金应力松弛发生的微观物理机制主要为位错攀移和亚晶界迁移，建立了以位错密度为内变量的宏微耦合本构模型。结合试验数据识别了模型参数，试验值与模型预测值的拟合结果表明，所提出的模型能够综合描述钛合金TA15在复杂工况下的应力松弛行为。

关键词: 钛合金, 热冲压, 应力松弛, 本构模型

Abstract: The hot stamping of titanium alloy sheets is a non-isothermal forming process while hot blank is formed and cooled in cold forming tools. The stress evolution is complex that involves not only the thermal-mechanical coupled deformation during forming but also the time-dependent stress relaxation during die quenching, which affects the final springback. To predict the stress relaxation accurately, it is critical to establish a universal stress relaxation model of titanium alloy under hot stamping conditions. Based on the GLEEBLE system, stress relaxation tests at temperature of 550-850℃ and different initial stress levels are conducted. The short-term stress relaxation of TA15 alloy is rapid at elevated temperature. The initial stress levels mainly affect the stress relaxation rate while the temperature affects the amount of stress release. Based on the stress relaxation mechanism of titanium alloy, which mainly include the dislocation climbing and sub-grain boundary migration, a macro-micro coupled model taken the dislocation density as internal variable is established. The model parameters are identified based on experimental results. Good agreement is achieved between the experimental values and the predicted ones, which indicates the proposed model is capable of describing stress relaxation behaviors of TA15 alloy comprehensively under complex conditions.

Key words: titanium alloy, hot stamping, stress relaxation, constitutive model

中图分类号:

V261

陈源, 李淑慧, 李永丰, 林忠钦. TA15钛合金应力松弛行为宏微耦合本构建模[J]. 机械工程学报, 2022, 58(12): 64-74.

CHEN Yuan, LI Shuhui, LI Yongfeng, LIN Zhongqin. Macro-micro Coupled Constitutive Modeling for Stress Relaxation Behavior of TA15 Alloy Sheet[J]. Journal of Mechanical Engineering, 2022, 58(12): 64-74.

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TA15钛合金应力松弛行为宏微耦合本构建模

Macro-micro Coupled Constitutive Modeling for Stress Relaxation Behavior of TA15 Alloy Sheet

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