高温高应变率下G550冷弯钢的动态力学行为

严吉涛; 陈文飞; 张浩; 尤建; 史超铭; 蒋昊成; 朱珏

doi:10.11858/gywlxb.20220705

高温高应变率下G550冷弯钢的动态力学行为

doi: 10.11858/gywlxb.20220705

严吉涛^{1, 2,},
陈文飞³,
张浩^{1, 2},
尤建^{1, 2},
史超铭^{1, 2},
蒋昊成^{1, 2},
朱珏^{1, 2,*, ,}

1.
宁波大学压力容器与管道安全浙江省工程研究中心, 浙江宁波　315211
2.
宁波大学冲击与安全工程教育部重点实验室, 浙江宁波　315211
3.
宁波市特种设备检验研究院, 浙江宁波　315211

基金项目: 国家自然科学基金（11972203，11572162）

详细信息

作者简介:
严吉涛（1997-），男，硕士研究生，主要从事冷弯钢结构研究. E-mail：1127503562@qq.com

通讯作者:
朱　珏（1979-），女，博士，教授，主要从事冷弯钢结构研究. E-mail：zhujue@nbu.edu.cn

中图分类号: O347; TG142
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出版历程
- 收稿日期: 2022-12-08
- 修回日期: 2022-12-28
- 网络出版日期: 2023-04-04
- 刊出日期: 2023-04-05

Dynamic Mechanical Behavior of G550 Cold-Formed Steel under High Temperature and High Strain Rate

YAN Jitao^{1, 2
,},
CHEN Wenfei³,
ZHANG Hao^{1, 2},
YOU Jian^{1, 2},
SHI Chaoming^{1, 2},
JIANG Haocheng^{1, 2},
ZHU Jue^{1, 2,*
, ,}

1.
Zhejiang Provincial Engineering Research Center for the Safety of Pressure Vessel and Pipeline, Ningbo University, Ningbo 315211, Zhejiang, China
2.
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China
3.
Ningbo Special Equipment Inspection and Research Institute, Ningbo 315211, Zhejiang, China

摘要

摘要: 为研究G550冷弯钢在高温和高应变率下的动态力学性能，采用高温同步控制霍普金森拉杆装置，开展了不同温度下的高应变率拉伸试验，并在高速液压拉伸试验机上进行了室温下的中应变率拉伸试验。通过获得的应力-应变曲线，得到了材料的本构模型，结合微观形貌分析，探究了温度和应变率对流变应力的影响。结果表明：G550冷弯钢具有明显的应变率强化和温度软化效应。在特定的高应变率范围内（1000～1500 s⁻¹），温度对流变应力的影响大于应变率。基于温度软化系数随温度变化的特征，提出了G550冷弯钢的修正Johnson-Cook本构模型。该模型可以较好地描述G550冷弯钢在高温和高应变率下的动态力学行为，从而为G550冷弯钢在高温、爆炸冲击相关的有限元仿真提供参考。
- G550冷弯钢 /
- 高温 /
- 高应变率 /
- 本构模型
Abstract: To study the dynamic mechanical properties of G550 cold-formed steel under high temperature and high strain rate, high-temperature synchronous controlled dynamic loading device (split Hopkinson tensile bar) was implemented. The medium strain rate tensile tests were also conducted with the high-speed hydraulic tensile testing machine. The constitutive model and the influence of temperature and strain rate on the flow stress were built and explored through the stress-strain curve and the microscopic analysis. The results show that G550 cold-formed steel has significant strain rate strengthening and temperature softening effects. In the specific high strain rate range (1000−1500 s⁻¹), the influence of temperature on the flow stress is more significant than that of strain rate. Then, a modified Johnson-Cook constitutive model of G550 cold-formed steel was proposed according to the temperature softening coefficient. This model can better describe the dynamic mechanical behavior of G550 cold-formed steel under high temperature and high strain rate, and can contribute to the finite element simulation of G550 cold-formed steel under high temperature and explosion impact.
- G550 cold-formed steel /
- high temperature /
- high strain rate /
- constitutive model

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图 1 试样尺寸及实物（单位：mm）

Figure 1. Dimension of specimen and physical drawing (Unit: mm)

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图 2 SHTB装置示意图

Figure 2. Schematic diagram of the SHTB device

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图 3 高温SHTB试验试样（单位：mm）

Figure 3. Specimen used in high-temperature SHTB test (Unit: mm)

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图 4 具有凹凸连接件形式的分离式夹具

Figure 4. Separate clamp of the concave-convex connector

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图 5 高温同步控制SHTB试验装置示意图

Figure 5. Schematic diagram of the high-temperature synchronous control SHTB

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图 6 室温中应变率下G550冷弯钢的真应力-应变曲线

Figure 6. True stress-strain curves of G550 cold-formed steel at room temperature and medium strain rate

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图 7 室温高应变率下G550冷弯钢的真应力-应变曲线

Figure 7. True stress-strain curves of G550 cold-formed steel at room temperature and high strain rate

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图 8 高温高应变率下G550冷弯钢的真应力-应变曲线

Figure 8. True stress-strain curves of G550 cold-formed steel at high temperature and high strain rate

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图 9 25～500 ℃下G550冷弯钢的应变率敏感性因子

Figure 9. Strain rate sensitivity factor of G550 cold-formed steel at 25−500 ℃

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图 10 25～500 ℃下1000和1500 s⁻¹对应的流变应力

Figure 10. Flow stress corresponding to 1000 and 1500 s⁻¹ at 25−500 ℃

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图 11 200～500 ℃、1000和1500 s⁻¹下温度敏感性因子与真应变的关系

Figure 11. Relationships between temperature sensitivity factor and true strain under 1000 and 1500 s⁻¹ at 200−500 ℃

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图 12 1000和1500 s⁻¹下平均温度敏感性因子与温度的关系

Figure 12. Relationships between the average temperature sensitivity factor and temperature under 1000 and 1500 s⁻¹

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图 13 1500 s⁻¹、不同温度下G550冷弯钢断口的微观形貌

Figure 13. Micromorphology of fracture of G550 cold-formed steel under 1500 s⁻¹ at different temperatures

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图 14 25 ℃、不同应变率下G550冷弯钢断口的微观形貌

Figure 14. Micromorphology of fracture of G550 cold-formed steel under different strain rates at 25 ℃

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图 15 25 ℃、100 s⁻¹下G550冷弯钢应力-应变曲线中的0.2%塑性应变

Figure 15. 0.2% plastic strain of stress-strain curve for G550 cold-formed steel under 100 s⁻¹ at 25 ℃

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图 16 25 ℃、100 s⁻¹下G550冷弯钢应力-应变曲线强化段的拟合

Figure 16. Fitting of strengthening section of stress-strain curve for G550 cold-formed steel under 100 s⁻¹ at 25 ℃

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图 17 25 ℃、不同应变率下G550冷弯钢应力-应变曲线强化段的拟合

Figure 17. Fitting of strengthening section of stress-strain curve for G550 cold-formed steel under different strain rates at 25 ℃

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图 18 m与温度的关系

Figure 18. Relationship between m and temperature

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图 19 1000～1500 s⁻¹、200～500 ℃下修正本构模型与高温SHTB试验结果比较

Figure 19. Comparison of modified constitutive model and high-temperature SHTB test data under 1000−1500 s⁻¹ and 200−500 ℃

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表 1 G550冷弯钢的化学组成

Table 1. Chemical element of G550 cold-formed steel %

C	Si	Mn	P	S	Fe
0.080	0.011	0.390	0.020	0.011	Balance

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表 2 1000～1500 s⁻¹、200～500 ℃下修正本构模型的平均相对误差和相关系数

Table 2. Mean relative error and correlation coefficient of modified constitutive under 1000−1500 s⁻¹ and 200−500 ℃

$\dot{ { \varepsilon } }$/s⁻¹	${\eta {_{ {\text{MRE} } } }}$/%				${\eta {_{\text{R} } }}$
$\dot{ { \varepsilon } }$/s⁻¹	200 ℃	300 ℃	400 ℃	500 ℃	200 ℃	300 ℃	400 ℃	500 ℃
1000	3.8	3.1	2.8	5.9	0.9778	0.9827	0.9840	0.9639
1500	2.9	6.1	8.9	2.5	0.9836	0.9627	0.9428	0.9861

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