纯铁材料动态力学性能测试及本构模型

doi:10.7527/S1000-6893.2013.0460

材料工程与机械制造

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纯铁材料动态力学性能测试及本构模型

孔金星^1,2, 陈辉², 何宁¹, 李亮¹, 姜峰³

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

收稿日期:2013-09-03 修回日期:2013-11-05 出版日期:2014-07-25 发布日期:2013-11-20
通讯作者: 孔金星，Tel.：0816-2487654E-mail：kjxmc106@163.com E-mail:kjxmc106@163.com
作者简介:孔金星男，博士研究生，高级工程师。主要研究方向：难加工材料高效、精密切削。Tel：0816-2487654E-mail：kjxmc106@163.com；陈辉男，高级工程师。主要研究方向：专用装备工艺技术研究、复杂构件制造。Tel：0816-2485660E-mail：chui884206@163.com；何宁男，博士生导师，教授。主要研究方向：高速、高性能切削与可持续加工技术和微细加工。Tel：025-84892256E-mail：drnhe@nuaa.edu.cn；李亮男，博士生导师，教授。主要研究方向：难加工材料的高性能切削与薄壁件的精密切削。Tel：025-84896040E-mail：liliang@nuaa.edu.cn；姜峰男，博士，讲师。主要研究方向：数值模拟在制造工艺优化中的应用。Tel：0592-6162616E-mail：jiangfeng@hqu.edu.cn

Dynamic Mechanical Property Tests and Constitutive Model of Pure Iron Material

KONG Jinxing^1,2, CHEN Hui², HE Ning¹, LI Liang¹, JIANG Feng³

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

Received:2013-09-03 Revised:2013-11-05 Online:2014-07-25 Published:2013-11-20

摘要/Abstract

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。

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

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.

Key words: pure iron material, Power-Law constitutive model, stress-strain curves, flow stress, high strain rate, SHPB

中图分类号:

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.

KONG Jinxing, CHEN Hui, HE Ning, LI Liang, JIANG Feng. Dynamic Mechanical Property Tests and Constitutive Model of Pure Iron Material[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(7): 2063-2071.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

纯铁材料动态力学性能测试及本构模型

Dynamic Mechanical Property Tests and Constitutive Model of Pure Iron Material

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