基于J-C模型的镁合金MB2动静态拉伸破坏行为

贾东; 黄西成; 胡文军; 张方举

doi:10.11883/1001-1455(2017)06-1010-07

基于J-C模型的镁合金MB2动静态拉伸破坏行为

doi: 10.11883/1001-1455(2017)06-1010-07

中国工程物理研究院总体工程研究所, 四川绵阳 621999

基金项目:

国家自然科学基金项目 11472257

中国工程物理研究院总体工程研究所创新与发展基金项目 13CXJ09

详细信息

作者简介:
贾东(1986—)，男，硕士, 助理研究员, jiadong@mail.ustc.edu.cn

中图分类号: O346.1
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- 被引次数: 0
出版历程
- 收稿日期: 2016-04-12
- 修回日期: 2016-11-27
- 刊出日期: 2017-11-25

Fracture behavior of magnesium alloy MB2 under quasi-static and dynamic tension loading based on Johnson-Cook model

Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

摘要

摘要: 为了研究不同应力状态和应变率条件下镁合金MB2的拉伸破坏行为，利用材料试验机和分离式Hopkinson拉杆(SHTB)，对镁合金MB2的光滑及缺口圆柱试件进行了动静态拉伸加载；拟合得到了镁合金MB2的动静态拉伸本构关系，建立了其修正的Johnson-Cook失效破坏准则，并对不同试件的拉伸破坏行为进行了数值模拟；利用SEM对宏观破坏模式对应的微观损伤机理进行了分析。结果表明，随着应力三轴度的增加，镁合金MB2的等效破坏应变先增大后减小，宏观破坏模式由剪切转为正拉断，微观损伤机制由混合断裂转变为韧窝断裂；而随着应变率的增加，等效破坏应变不断减小，破坏模式不发生改变。Johnson-Cook本构关系和修正后的Johnson-Cook失效破坏准则能较好地拟合动态静态拉伸实验结果并预测不同试件的杯锥形破坏特征。
- 破坏行为 /
- SHTB实验 /
- 镁合金MB2 /
- 应力三轴度 /
- 应变率
Abstract: In the present study, we loaded smooth and notched cylindrical specimens of magnesium alloy MB2 under quasi-static and dynamic tension states using the material testing machine and split Hopkinson tension bar (SHTB), to characterize the alloy's tensile fracture behaviors under different stress states and strain rates. The constitution of the alloy for quasi-static and dynamic tension states was fitted and the modified fracture criterion based on the Johnson-Cook model was established and then used to simulate the fracture behavior of different tensile specimens. The microscopic damage mechanisms corresponding to the macroscopic fracture pattern was analyzed by SEM. The results show that with the increase of the stress triaxiality, the equivalent strain to fracture of the alloy increases at first and then decreases, and the fracture pattern changes from shear fracture to vertical tension fracture with micro damage mechanisms changing from the mixed failure to the dimple failure; with the increase of the strain rate, the equivalent strain to fracture decreases, and the fracture pattern remains the same. The Johnson-Cook constitution and the modified Johnson-Cook fracture criterion can be used to fit the experimental results under quasi-static and dynamic tension states and predict the cup-cone fracture characteristics of different specimens.
- fracture behavior /
- SHTB experiment /
- magnesium alloy MB2 /
- stress triaxiality /
- strain rate

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图 1 SHTB实验系统

Figure 1. SHTB testing system

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图 2 镁合金MB2真实应力应变曲线

Figure 2. True stress-strain curves of magnesium alloy MB2

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图 3 不同试件破坏模式

Figure 3. Macro fracture patterns of different specimens

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图 4 不同类型试件应力三轴度变化

Figure 4. Stress triaxiality curves of different specimens

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图 5 应变率项参数拟合曲线

Figure 5. Fitted curve for the item of strain rates

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图 6 镁合金MB2的破坏准则曲面

Figure 6. Fracture criterion surface of magnesium alloy MB2

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图 7 不同试件失效破坏模式的数值模拟结果

Figure 7. Fracture patterns of different specimens from numerical simulation

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图 8 试件微观断口形貌

Figure 8. Micro fracture morphology of specimens

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表 1 不同类型试件的等效破坏应变

Table 1. Equivalent fracture strain of different specimens

入射波幅值/MPa	等效破坏应变
入射波幅值/MPa	光滑	R=3.0 mm	R=2.0 mm	R=1.5 mm	R=1.0 mm
50	未断裂	0.333 8	0.250 2	0.254 1	0.205 3
120	0.311 7	0.307 1	0.225 7	0.239 7	0.197 7
350	0.289 3	0.249 2	0.180 0	0.175 8	0.177 6

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表 2 缺口试件的平均应变率

Table 2. Average strain rates of different specimens

入射波幅值/MPa	平均应变率/s^-1
入射波幅值/MPa	R=3 mm	R=2 mm	R=1.5 mm	R=1 mm
50	828	968	1 047	1 239
120	2 315	2 573	2 569	2 694
350	3 905	4 129	4 914	4 981

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