| 纯铁材料动态力学性能测试及本构模型 |
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| 引用本文： | 孔金星,陈辉,何宁,李亮,姜峰. 纯铁材料动态力学性能测试及本构模型[J]. 航空学报, 2014, 35(7): 2063-2071. DOI: 10.7527/S1000-6893.2013.0460 |
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| 作者姓名： | 孔金星 陈辉 何宁 李亮 姜峰 |
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| 作者单位： | 1. 南京航空航天大学 机电学院, 江苏 南京 210016;2. 中国工程物理研究院 机械制造工艺研究所, 四川 绵阳 621900;3. 华侨大学 机电及自动化学院, 福建 厦门 361021 |
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| 摘 要： | 研究纯铁材料的动态力学性能并建立其本构模型是开展纯铁材料工程应用和数值模拟研究的基础，利用Instron材料试验机和分离式Hopkinson压杆试验装置，对纯铁材料进行了常温下不同应变率（10-3~5×104s-1）和应变率为104s-1时不同温度下（200~800℃）的动态力学性能测试，获得了各种载荷下的应力-应变曲线。试验结果表明，纯铁材料的塑性流动应力对应变率和温度非常敏感，具有明显的应变强化效应、应变率强化和增塑效应以及热软化效应。基于Power-Law本构方程，通过试验数据拟合得到了纯铁材料的动态本构模型参数，拟合曲线与试验数据吻合较好，表明该模型能较好描述纯铁材料在动态载荷下的力学行为。
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| 关 键 词： | 纯铁材料 Power-Law本构模型 应力-应变曲线 流动应力 高应变率 SHPB |
| 收稿时间： | 2013-09-03 |
| 修稿时间： | 2013-11-05 |
Dynamic Mechanical Property Tests and Constitutive Model of Pure Iron Material |
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| KONG Jinxing,CHEN Hui,HE Ning,LI Liang,JIANG Feng. Dynamic Mechanical Property Tests and Constitutive Model of Pure Iron Material[J]. Acta Aeronautica et Astronautica Sinica, 2014, 35(7): 2063-2071. DOI: 10.7527/S1000-6893.2013.0460 |
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| Authors: | KONG Jinxing CHEN Hui HE Ning LI Liang JIANG Feng |
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| Affiliation: | 1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. Institute of Mechanical Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, China;3. College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China |
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| Abstract: | To study the dynamic mechanical property and built constitutive model of pure iron material are the basis of engineering application and numerical simulation. The dynamic mechanical property test of pure iron material are carried out using Instron material testing system and split Hopkinson pressure bar apparatus under different strain rates (10-3-5×104s-1) at room temperature and different temperature (200-800℃) at high strain rate 104s-1.The stress-strain curves of pure iron are measured at high temperatures and high strain rates. The test results show that the plastic flow stress of pure iron material is sensitive to strain rate and temperature and has the effect of strain hardening, strain rate hardening plasticizing effect and thermal softening. Based on the Power-Law constitutive model, the dynamic constitutive model parameter with high strain rates and high temperatures of pure iron material is obtained by fitting the test results. The model predictions have a good agreement with test data and the dynamic constitutive model can make a satisfied prediction to the mechanial behavior of pure iron materials under dynamic loads. |
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| Keywords: | pure iron material Power-Law constitutive model stress-strain curves flow stress high strain rate SHPB |
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