7150-T6铝合金动态特性实验及本构方程研究

陈睿; 温仕成; 王旭; 彭锐涛; 胡聪芳

doi:10.13433/j.cnki.1003-8728.20200491

7150-T6铝合金动态特性实验及本构方程研究

doi: 10.13433/j.cnki.1003-8728.20200491

陈睿^{1, 2,},
温仕成^{1, 2},
王旭^{1, 2},
彭锐涛^{1, 2, ,},
胡聪芳^{1, 2}

1.
湘潭大学机械工程学院, 湖南湘潭 411105
2.
湘潭大学复杂轨迹加工工艺及装备教育部工程研究中心, 湖南湘潭 411105

基金项目:

国家自然科学基金项目 11602212

国家自然科学基金项目 51975504

国家自然科学基金项目 51705442

湖南省杰出青年项目 2022JJ10045

湖南省自然科学基金项目 2018JJ3509

湖南省教育厅一般项目 19C1785

详细信息

作者简介:
陈睿(1985-), 副教授，博士, 研究方向为材料动力学响应和材料结构设计与优化, chenrui85@xtu.edu.cn

通讯作者:
彭锐涛, 教授, 博士生导师, pengruitao@xtu.edu.cn

中图分类号: TH212;TH213.3
计量
- 文章访问数: 145
- HTML全文浏览量: 79
- PDF下载量: 26
- 被引次数: 0
出版历程
- 收稿日期: 2020-11-27
- 刊出日期: 2022-08-25

Experimental Study of Dynamic Characteristics and Constitutive Equation of 7150-T6 Aluminum Alloy

CHEN Rui^{1, 2
,},
WEN Shicheng^{1, 2},
WANG Xu^{1, 2},
PENG Ruitao^{1, 2
, ,},
HU Congfang^{1, 2}

1.
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, Hu′nan, China
2.
Engineering Research Center of Complex Track Processing Technology and Equipment, Ministry of Education, Xiangtan University, Xiangtan 411105, Hu′nan, China

摘要

摘要: 为研究高温与高应变率对7150-T6铝合金动态力学性能的影响，利用分离式霍普金森压杆装置进行动态冲击试验，并对冲击后试样进行了SEM显微组织分析。结果表明：7150-T6铝合金在常温、高应变率下呈现局部热软化现象和较弱的应变率敏感性。材料的流动应力随着温度的升高而不断减小，尤其当温度高于200 ℃时，流动应力显著降低。在高应变率冲击下，应变率增大使绝热剪切带的形成更加明显，而高温下未发生明显绝热剪切现象。通过最小二乘法拟合出的Johnson-Cook本构方程能够有效预测不同加载条件下的流动应力，其预测结果与试验结果基本吻合。本研究可为7150-T6铝合金在汽车等运载器结构的轻量化与安全性设计提供指导。
- 7150-T6铝合金 /
- SHPB实验 /
- 高温 /
- 高应变率 /
- Johnson-Cook本构模型 /
- 绝热剪切带
Abstract: In order to investigate the effect of high temperature and high strain rate on the dynamic mechanical properties of 7150-T6 aluminum alloy, the dynamic impact experiments are carried out by split Hopkinson pressure bar (SHPB), and the microstructure of samples are observed by scanning electron microscopy (SEM). The results show that 7150-T6 aluminum alloy has local thermal softening and weak strain rate sensitivity under high strain rate at room temperature. The flow stress of the material decreases with the increasing of temperature. Especially as the temperature above 200 ℃, the flow stress decreases significantly. Under high strain rate, the higher strain rate causes more obvious adiabatic shear band, while the phenomenon does not occur at high temperature. The Johnson-Cook constitutive equation fitted by the least square method can effectively predict the flow stress under different loading conditions, and the results are well consistent with the experiment data. The research can provide guidance for the lightweight and safety design of 7150-T6 aluminum alloy in vehicles.
- 7150-T6 aluminum alloy /
- SHPB experiment /
- high temperature /
- high strain rate /
- Johnson-Cook model /
- adiabatic shear band

HTML全文

图 1 SHPB实验装置

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图 2 SHPB空杆撞击时的典型电压波信号

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图 3 抛光后试样的SEM显微照片

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图 4 常温不同应变率下7150-T6铝合金的应力-应变

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图 5 常温下应变为0.1时的对数应力与对数应变率

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图 6 高温下应变率为2 000 s^-1的应力-应变曲线

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图 7 相同气压不同温度下的应力-应变曲线

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图 8 不同加载条件下的能量吸收时程曲线

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图 9 不同加载条件下的能量吸收率时程曲线

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图 10 常温不同应变率下试样的SEM显微图像

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图 11 2 000 s^-1不同温度下试样的SEM显微图像

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图 12 准静态拉伸试验结果与拟合结果的比较

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图 13 常温不同应变率下的试验结果与拟合结果的比较

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图 14 2 000 s^-1不同温度下的试验结果与拟合结果的比较

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表 1 AA7150-T6铝合金各元素的质量分数 %

Si	Fe	Cu	Mg	Mn	Cr	Zn	Ti	Zr
0.12	0.15	2.20	2.35	0.10	0.04	6.5	0.06	0.60

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表 2 7150-T6铝合金常温下(20 ℃) 不同应变率下的动态特性

子弹速度/(m·s^-1)	应变率/s^-1	屈服强度/MPa	最大流动应力/MPa
24.20	820	488.3	663.5
28.98	1 163	494.4	708.4
31.90	1 451	516.5	771.8
35.40	1 881	547.4	810.2
39.21	2 208	542.6	815.8
44.08	2 614	557.7	883.6

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表 3 7150-T6铝合金在不同温度下的动态特性

温度/℃	子弹速度/(m·s^-1)	应变率/s^-1	屈服强度/MPa	最大流动应力/MPa
20	36.97	1 980	563.4	819.1
100	37.00	1 945	557.1	829.4
200	37.53	1 976	533.7	785.2
300	22.95	1 980	309.3	539.3
400	20.37	1 942	217.2	406.9
300	37.76	2 584	382.2	638.1
400	36.88	3 473	237.5	575.6

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表 4 7150-T6铝合金Johnson-Cook本构模型参数

E/GPa	A/MPa	B/MPa	n	C	m
68.7	490.6	645.6	0.794	0.008 7	2.11

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