锻压技术

6014铝合金热冲压流变行为的本构模型修正

英文标题：Modification on constitutive model for rheological behavior of 6014 aluminum alloy in hot stamping

单位：1. 南昌工程学院机械工程学院 2.北京机电研究所有限公司 3. 北京机科国创轻量化科学研究院有限公司

分类号：TG302

出版年,卷(期):页码：2021,46(12):67-73

摘要：

利用热模拟实验机对6014铝合金进行了不同变形温度（400~500 ℃）和不同应变速率（0.01~1 s-1）下的热拉伸实验，分析了变形温度与应变速率对6014铝合金高温下力学行为的影响，利用实验数据并基于采用Zener-Hollmon参数的双曲正弦函数模型建立并修正了6014铝合金热冲压流变行为的本构模型，最终通过十字件拉深数值模拟与实验进行了对比验证。研究结果表明：6014铝合金的流变应力随着应变的增加迅速增加后趋于平稳，同时，随着应变速率的增加而增加，随着变形温度的增加而降低；使用扫描电子显微镜观察到试样的断口形貌为韧性断裂，说明高温下6014铝合金的塑性大幅提升；修正得到的本构模型具有较高的精度，平均误差为5.4%。

The hot tensile experiments of 6014 aluminum alloy at different deformation temperatures (400-500 ℃) and different strain rates (0.01-1 s-1) were conducted by the thermal simulation experiment machine, and the influences of deformation temperature and strain rate on the mechanical behavior of 6014 aluminum alloy were analyzed. Then, using experimental data, the constitutive model of rheological behavior for 6014 aluminum alloy in hot stamping was established and modified based on the hyperbolic sine function model using Zener-Hollmon parameters, and the numerical simulation and experiment of cross-part drawing were compared and verified. The results show that the rheological stress of 6014 aluminum alloy increases rapidly first and then becomes steadily with the increasing of strain, which increases with the increasing of strain rate and decreases with the increasing of deformation temperature. In addition, the fracture morphology of specimen observed by SEM is ductile fracture, indicating that the plasticity of 6014 aluminum alloy is greatly improved at high temperature, and the modified constitutive model has high accuracy with an average error of 5.4%.

基金项目：

江西省教育厅科技项目（GJJ201903）；国家科技重大专项(2014ZX04002-071)

作者简介：沈智（1980-），男，博士，讲师，工程师 E-mail：nickshen009@163.com

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