基于J-C模型的Q235钢的失效准则

郭子涛; 舒开鸥; 高斌; 张伟

doi:10.11883/bzycj-2017-0163

基于J-C模型的Q235钢的失效准则

doi: 10.11883/bzycj-2017-0163

郭子涛¹,
舒开鸥¹,
高斌¹,
张伟^2, ,

1.
九江学院土木工程与城市建设学院, 江西九江 332005
2.
哈尔滨工业大学高速撞击研究中心, 黑龙江哈尔滨 150080

基金项目:

国家自然科学基金项目 11072072

江西省自然科学基金项目 20161BAB211001

详细信息

作者简介:
郭子涛(1979-), 男, 博士, 副教授

通讯作者:
张伟, zhdawei@hit.edu.cn

中图分类号: O347.3
计量
- 文章访问数: 5880
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- 被引次数: 0
出版历程
- 收稿日期: 2017-05-10
- 修回日期: 2017-08-17
- 刊出日期: 2018-11-25

J-C model based failure criterion and verification of Q235 steel

GUO Zitao¹,
SHU Kaiou¹,
GAO Bin¹,
ZHANG Wei^{2
, ,}

1.
School of Civil Engineering & Urban Construction, Jiujiang University, Jiujiang 332005, Jiangxi, China
2.
Hypervelocity Impact Research Center, Harbin Institute of Technology, Harbin 150080, Helongjiang, China

摘要

摘要: 使用Instron材料试验机、霍普金森拉杆（SHTB）对Q235钢试件进行了不同温度下的准静态和动态拉伸实验，研究了温度、应变率及应力三轴度对Q235钢失效应变的影响，结果表明：Q235钢失效应变随温度的升高而增加，随应变率的增加而减小，随应力三轴度的增加先减小后增加再减小。基于实验结果对Q235钢J-C失效模型中的温度项进行了修正，并结合数值模拟提出了基于J-C失效模型的应力三轴度三分段式失效准则，通过Taylor撞击实验和数值模拟对给出的模型相关参量进行了验证，实验与模拟结果吻合较好。
- Q235钢 /
- 失效准则 /
- 应力三轴度 /
- Taylor撞击
Abstract: In this paper, we conducted quasi-static and dynamic tensile tests on Q235 steel at different temperatures using the Instron tensile strength tester and the split Hopkinson bar and studied the effects of temperature, strain rates and stress triaxiality on the steel's failure strains of Q235. The results show that Q235 steel's failure strains increase with a rise in temperature but decrease with a rise the strain rates while, with a rise in the stress triaxiality, they decrease at first but then increase. Based on these results and combining them with numerical simulation, we modified the item of temperature effects and proposed a revised three-section failure criterion of stress triaxiality for J-C failure model, with relevant parameters determined and verified using Taylor impacting experiments and corresponding numerical simulations. The experimental results accord well with those from simulation.
- Q235 steel /
- failure criterion /
- stress triaxiality /
- Taylor impact

HTML全文

图 1 平板缺口试件示意图

Figure 1. Sketches of notched flat samples

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图 2 拉伸及剪切实验后的试样

Figure 2. Samples after tensile and shear tests

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图 3 有限元模型及计算Mises应力云图

Figure 3. Numerical model and Mises stress nephogram for a flat specimen at the time of necking

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图 4 试件的实验和模拟的载荷位移曲线对比

Figure 4. Comparison between tests and simulations of load-elongation curves

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图 5 平板试样的断口形式及示意图

Figure 5. Schematic plot of fracture in tested flat sample

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图 6 应力三轴度随等效应变的变化

Figure 6. Variation of the stress triaxiality with equivalent strain

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图 7 断裂应变随应力三轴度的变化

Figure 7. Variation of fracture strain with the average stress triaxiality

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图 8 常温下拉伸试件尺寸(单位：)

Figure 8. Dimensions of quasi-static tensile samples tested at room temperature (unit: mm)

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图 9 动态拉伸试样及卡口连接

Figure 9. Specimen in dynamic tensile tests and the fastener connection

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图 10 断裂应变随无量纲应变率的变化

Figure 10. Variation of fracture strain with dimensionless strain rates

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图 11 平板试件在不同温度下的断口形式

Figure 11. Fracture patterns of flat specimens at different temperatures

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图 12 断裂应变随无量纲温度的变化

Figure 12. Variation of fracture strain with dimensionless temperature

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图 13 Taylor撞击数值模拟有限元模型

Figure 13. Geometrical model of FEM modelling for Taylor impact tests

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图 14 Taylor撞击实验弹体临界开裂实验和数值模拟对比

Figure 14. Critical fractures obtained in Taylor experiments and predicted by simulation

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图 15 Q235弹在高速下的Taylor撞击实验结果与数值模拟结果对比

Figure 15. Rod fracture patterns obtained in Taylor experiments and predicted by simulation for Q235 projectiles at high velocities

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表 1 Q235钢的失效模型相关参数

Table 1. Material parameters for Q235 steel

E/GPa	ν	ρ/(kg·m^-3)	T_r/K	T_m/K	c_p/(J·kg^-1·K^-1)		χ	$ {\dot \varepsilon _0} $/s^-1
200	0.33	7 800	293	1 795	469		0.9	2.1×10^-3

D₀₁	D₀₂	D₀₃	D₁	D₂	D₃	D₄	D₅	D₆
0.511	-6.80	4.047	0.472	18.728	-7.805	-0.019 3	13.017	2.338

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