6061-T6铝合金动态拉伸本构关系及失效行为

周伦; 苏兴亚; 敬霖; 邓贵德; 赵隆茂

doi:10.11883/bzycj-2022-0154

6061-T6铝合金动态拉伸本构关系及失效行为

doi: 10.11883/bzycj-2022-0154

周伦^{1, 2,},
苏兴亚¹,
敬霖^1, ,,
邓贵德³,
赵隆茂⁴

1.
西南交通大学牵引动力国家重点实验室，四川成都 610031
2.
四川航空工业川西机器有限责任公司，四川雅安 625000
3.
中国特种设备检测研究院，北京100029
4.
太原理工大学应用力学研究所，山西太原 030024

基金项目: 国家自然科学基金（12122211）；国家重点研发计划（2016YFF0203102）；四川省自然科学基金（2022NSFSC0035）

详细信息

作者简介:
周　伦（1995－　），男，硕士研究生，zhoulunabc@126.com

通讯作者:
敬　霖（1984－　），男，博士，研究员，博士生导师，jinglin@swjtu.edu.cn

中图分类号: O347.3
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- 被引次数: 0
出版历程
- 收稿日期: 2022-04-08
- 修回日期: 2022-08-23
- 网络出版日期: 2022-09-05
- 刊出日期: 2022-09-29

Dynamic tensile constitutive relationship and failure behavior of 6061-T6 aluminum alloy

ZHOU Lun^{1, 2
,},
SU Xingya¹,
JING Lin^{1
, ,},
DENG Guide³,
ZHAO Longmao⁴

1.
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
Sichuan Aviation Industry Chuanxi Machine Co. Ltd., Yaan 625000, Sichuan, China
3.
China Special Equipment Inspection and Research Institute, Beijing 100029, China
4.
Institute of Applied Mechanics, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

摘要

摘要: 采用HMH-206高速材料试验机开展了6061-T6铝合金在0.001～100 s⁻¹应变率范围内的静、动态拉伸力学性能实验，分析了其应力-应变响应特征和应变率敏感性，讨论了应变率对6061-T6铝合金流动应力和应变率敏感性指数的影响，并基于实验结果对Johnson-Cook本构模型进行了修正。结合缺口试件的实验结果和模拟数据，得到了材料的Johnson-Cook失效模型参数，并对模型的准确性和适用性进行了验证。结果表明，在拉伸载荷作用下，6061-T6铝合金表现出明显的应变硬化特征和应变率敏感性，其流动应力随应变率的升高而提高，修正的Johnson-Cook本构模型可以描述材料的动态塑性流动行为，建立的Johnson-Cook失效模型能够表征材料的断裂失效行为。
- 6061-T6铝合金 /
- 动态力学性质 /
- 应变率敏感性 /
- Johnson-Cook本构模型 /
- 失效参数
Abstract: The quasi-static and dynamic tensile mechanical properties of 6061-T6 aluminum alloy in a strain rate range from 0.001 s⁻¹ to 100 s⁻¹ were investigated by using a HMH-206 high-speed material testing machine. The stress-strain response characteristics and strain rate sensitivity of the 6061-T6 aluminum alloy were analyzed, and the effects of strain rate on the flow stress and strain rate sensitivity index were discussed. Based on the experimental results, the Johnson-Cook constitutive model was modified to describe the plastic flow characteristics of the 6061-T6 aluminum alloy under dynamic tensile loading. In addition, the relationship between the fracture strain and stress triaxiality of the notched specimens was established by experiments and simulations, and the values of the parameters in the Johnson-Cook failure model were obtained according to the experimental and simulation results. The results show that the 6061-T6 aluminum alloy exhibits obvious strain hardening characteristics and strain rate strengthening effects, and the flow stress increases with the increase of true strain and strain rate. The strain rate sensitivity index of the material is affected by the coupling effect of strain and strain rate. During the tensile process, the Mises stress of the notched specimens was symmetrically distributed about the minimum cross-section, and the stress triaxiality at the minimum cross-section was symmetrically distributed about the center line along the width and thickness directions. Furthermore, the fracture strain of the material decreases gradually with the increase of the stress triaxiality, and increases approximately linearly with the increasing dimensionless logarithmic strain rate. The plastic flow characteristics of the 6061-T6 aluminum alloy can be described by the modified Johnson-Cook constitutive model, and the parameters in the Johnson-Cook failure model of the material can be obtained by the experiments and simulations on the notched specimens. The verification results indicate that the established models can predict the tensile mechanical response and fracture failure behavior of the 6061-T6 aluminum alloy under a complex stress state.
- 6061-T6 aluminum alloy /
- dynamic mechanical property /
- strain rate sensitivity /
- Johnson-Cook constitutive model /
- failure parameter

HTML全文

图 1 拉伸试件及其几何尺寸（单位：mm）

Figure 1. Picture and dimension of the tensile specimens (unit: mm)

下载: 全尺寸图片幻灯片

图 2 不同应变率下6061-T6铝合金的拉伸实验结果

Figure 2. Tensile test results of 6061-T6 aluminum alloy at different strain rates

下载: 全尺寸图片幻灯片

图 3 不同应变下应变率敏感性指数与应变率之间的关系

Figure 3. Relationship between strain rate sensitivity index and strain rate at different strains

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图 4 模型预测与实验结果对比

Figure 4. Comparison of predictions by the models with experimental results

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图 5 6061-T6铝合金缺口试件和拉伸载荷-位移曲线

Figure 5. Notched 6061-T6 aluminum alloy specimens and their tensile load-displacement curves

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图 6 实验和数值模拟得到的缺口试件载荷-位移曲线

Figure 6. Load-displacement curves of the notched specimens obtained by experiments and simulations

下载: 全尺寸图片幻灯片

图 7 不同缺口半径试件的Mises应力云图和应力三轴度分布

Figure 7. Mises stress nephograms and stress triaxiality distributions for notched specimens with different radii

下载: 全尺寸图片幻灯片

图 8 缺口试件最小截面中心点应力三轴度与等效塑性应变的关系

Figure 8. Relationship between stress triaxiality at the center points of the minimum cross-sections of notched specimens and equivalent plastic strain

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图 9 断裂应变与应力三轴度和无量纲对数应变率的关系

Figure 9. Relationships of fracture strain with stress triaxiality and dimensionless strain rate

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图 10 6061-T6铝合金模型验证试件

Figure 10. The 6061-T6 aluminum alloy specimen used for model verification

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图 11 不同加载速度下实验和模拟得到的载荷-位移曲线对比

Figure 11. Comparison of the load-displacement curves obtained by experiments and simulations at different load velocities

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表 1 6061-T6铝合金的化学成分（质量分数）

Table 1. Chemical composition of 6061-T6 aluminum alloy (mass fraction)

%
元素 Si Fe Cu Mn Mg Cr Zn Ti Al

含量 0.4 0.7 0.15 0.15 0.5 0.04 0.25 0.15 余量

下载: 导出CSV

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