• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (4): 44-52.doi: 10.3901/JME.2021.04.044

• 材料科学与工程 • 上一篇    下一篇

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热冲压条件下2219铝合金的本构行为测试与建模

安剑1, 李永丰2,3, 张云光2,3, 李淑慧2,3   

  1. 1. 中车青岛四方机车车辆股份有限公司技术工程部 青岛 266111;
    2. 上海交通大学机械系统与振动国家重点实验室 上海 200240;
    3. 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:2020-04-20 修回日期:2020-10-27 出版日期:2021-02-20 发布日期:2021-04-28
  • 通讯作者: 李永丰(通信作者),男,1987年出生,博士后。主要研究方向为轻质高强材料热冲压成形理论与数值模拟技术。E-mail:liyf14@sjtu.edu.cn
  • 作者简介:安剑,男,1981年出生,高级工程师。主要研究方向为轨道车辆车体制造工艺。E-mail:010500019339@crrcgc.cc
  • 基金资助:
    国家自然科学基金资助项目(51975366)。

Constitutive Behavior of 2219 Aluminum Alloy under Hot Stamping Condition

AN Jian1, LI Yongfeng2,3, ZHANG Yunguang2,3, LI Shuhui2,3   

  1. 1. Engineering Department, CRRC Qingdao Sifang Rolling Stock Co., Ltd, Qingdao 266111;
    2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240;
    3. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240
  • Received:2020-04-20 Revised:2020-10-27 Online:2021-02-20 Published:2021-04-28

摘要: 铝合金热冲压过程中板料在非等温连续冷却过程中发生塑性变形。为了表征2219铝合金在热冲压条件下的变形行为,基于Gleeble热模拟试验机开发了新型夹具和高温高速DIC全场应变测试方法,在350~475℃,0.01~1 s-1应变速率下进行热拉伸试验。综合Swift模型的强硬化和Hockett-Sherby(H-S)模型的弱硬化特性对Johnson-Cook(J-C)模型进行了修正,并提出新的混合硬化模型,通过建立混合硬化因子与温度和应变率的关系实现了各种变形条件下2219铝合金高温变形行为准确描述,利用试验所获流变曲线对本构模型参数进行了识别,识别结果显示修正J-C模型能够准确描述2219铝合金的高温流变行为。建立航空发动机唇口特征件热冲压成形仿真模型,仿真结果显示预测零件壁厚减薄率与试验测试结果较为吻合,验证了提出变形测试方法和修正J-C模型的可靠性。

关键词: 2219铝合金, 热冲压, 高温拉伸测试, 流动行为, 本构模型

Abstract: In hot stamping,the plastic deformation of aluminum alloy sheet occurs in nonisothermal conditions. To characterize the 2219 alloy hot deformation behavior under hot stamping condition,high precision tensile test method is developed based on the Gleeble system. The tensile tests employing the heating path representative of the hot stamping process are performed over a temperature range of 350-475 ℃ and a strain rate range of 0.01-1 s-1. The Johnson-Cook (J-C) model is modified by combining the hardening of the Swift and Hockett-Sherby (H-S) model,and a new mixed hardening model is proposed. In this model,the relationship between the mixed hardening factor and the strain rate is established to describe the high-temperature deformation behavior of the 2219 alloy under various deformation conditions. The modified Johnson-Cook constitutive model is calibrated using the hot tensile test data,the results indicate that the modified Johnson-Cook model can provide the most accurate prediction for the 2219 hot flow behavior. Finally,a hot stamping simulation model of U-shaped cross-section part is established,and the reliability of the modified Johnson-Cook model is further verified by the simulation results.

Key words: 2219 aluminum alloy, hot stamping, hot tensile, flow behavior, constitutive model

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