| 引用本文: | 李国和,王敏杰,康仁科.Fe-36Ni高温高应变率动态力学性能及其本构关系[J].材料科学与工艺,2010,18(6):824-828,834.DOI:10.11951/j.issn.1005-0299.20100618. |
| LI Guo-he,WANG Min-jie,KANG Ren-ke.Dynamic mechanical properties and constitutive model of Fe-36Ni invar alloy at high temperature and high strain rate[J].Materials Science and Technology,2010,18(6):824-828,834.DOI:10.11951/j.issn.1005-0299.20100618. |
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| 摘要: |
| 为研究Fe-36Ni因瓦合金的动态力学性能及其本构关系,在20～800℃和10-3～104 s-1的应变率内,采用电子万能试验机和高温分离式霍普金森压杆分别对Fe-36Ni因瓦合金进行准静态实验和动态压缩实验,得到其高温、高应变率下的应力-应变曲线.结果表明,Fe-36Ni因瓦合金的流动应力表现出较强的应变率和温度敏感性,随着应变率的增大而增大,随着温度的升高而减小.采用改进应变率项和温度项的Johnson-Cook本构方程拟合了Fe-36Ni因瓦合金在高温、高应变率下的动态塑性本构关系,拟合结果与试验数据吻合很好. |
| 关键词: 动态力学性能 本构关系 分离式霍普金森压杆 高温 高应变率 |
| DOI：10.11951/j.issn.1005-0299.20100618 |
| 分类号:O344.1 |
| 基金项目:国家自然科学基金资助项目(50775018) |
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| Dynamic mechanical properties and constitutive model of Fe-36Ni invar alloy at high temperature and high strain rate |
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LI Guo-he1,2, WANG Min-jie1, KANG Ren-ke1
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1.Key Laboratory of Ministry of Education for Precision and Non-Traditional Machining,Dalian University of Technology, Dalian 116024,China;2.Tianjin Key Laboratory of High Speed Cutting & Accurate Process Technology,Tianjin University of Technology and Education,TUTE,Tianjin 300222,China
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| Abstract: |
| To study the dynamic mechanical property and constitutive relation of Fe-36Ni invar alloy,quasi-static and dynamic compression experiments of Fe-36Ni invar alloy were performed at a range of temperature from 20 ℃ to 800 ℃ and strain rate form 10-3to 104/s by electronic universal testing machine and high temperature Split Hopkinson Pressure Bar,and the curves of stress-strain under high temperatures and high strain rates were gained.The results indicate that the flow stress of Fe-36Ni Invar alloy is sensitive to the strain rate and temperature.The flow stress increases with the increasing of strain rate and the decreasing of temperature.An improved Johnson-Cook model with new strain rate item and temperature item was presented to fit the stress-strain curves of Fe-36Ni invar alloy very well. |
| Key words: dynamic mechanical property constitutive model split hopkinson pressure bar high temperature high strain rate |
