Fe-C合金动态拉伸力学性能温度和应变率效应分子动力学
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摘要
爆炸冲击荷载作用下温度和应变率对钢材动态力学性能的影响一直备受关注。Fe-C合金体系是钢材的基本组成部分;以Fe-C合金为基本研究对象,采用分子动力学方法模拟九种温度和四种应变率条件下Fe-C合金的单轴动态拉伸过程。结果表明:在所研究的温度和应变率范围内,Fe-C合金弹性模量对于应变率变化不敏感,对于温度变化非常敏感;随着温度的升高,弹性模量明显减小;相同温度条件下,屈服强度和峰值应变随应变率的增大而增大;相同应变率条件下,屈服强度和峰值应变随温度的升高而减小;温度和应变率对屈服强度的影响不具有相关性。基于分子动力学模拟,建立的纳米尺度下Fe-C合金动态拉伸力学性能计算公式能反映温度和应变率效应的共同影响,为钢材在爆炸冲击作用下动态拉伸力学性能描述提供依据。
Dynamic mechanical properties of steel under the loading of blast and impact is always a concerned issue. Regarding Fe-C alloy,the basic composition of steel,as the research object,the uniaxial tensile deformation of Fe-C alloy at nine temperatures and four strain rates was analyzed using molecular dynamics( MD) simulations.In the research range,it was shown that the elastic modulus of Fe-C alloy is independent on strain rate,but sensitive to temperature,the elastic modulus decreases obviously with the increase of temperature; the yield strength and peak strain increase with the increase of the strain rate at the same temperature; the yield strength and peak strain decrease with the increase of temperature at the same strain rate; there is no interrelation between the temperature and strain rate effects of the yield strength. To provide evidence for the description of dynamic tensile mechanical properties of steel under the loading of blast and impact,the forecasting formula on dynamic tensile mechanical properties of Fe-C alloy affected by temperature and strain rate at nanometer scale was put forward based on the results of the simulation.
Dynamic mechanical properties of steel under the loading of blast and impact is always a concerned issue. Regarding Fe-C alloy,the basic composition of steel,as the research object,the uniaxial tensile deformation of Fe-C alloy at nine temperatures and four strain rates was analyzed using molecular dynamics( MD) simulations.In the research range,it was shown that the elastic modulus of Fe-C alloy is independent on strain rate,but sensitive to temperature,the elastic modulus decreases obviously with the increase of temperature; the yield strength and peak strain increase with the increase of the strain rate at the same temperature; the yield strength and peak strain decrease with the increase of temperature at the same strain rate; there is no interrelation between the temperature and strain rate effects of the yield strength. To provide evidence for the description of dynamic tensile mechanical properties of steel under the loading of blast and impact,the forecasting formula on dynamic tensile mechanical properties of Fe-C alloy affected by temperature and strain rate at nanometer scale was put forward based on the results of the simulation.
引文
1 Lee W S,Yeh G W.The plastic deformation behaviour of AISI 4340alloy steel subjected to high temperature and high strain rate loading conditions[J].Journal of Materials Processing Technology,1997,71(2):224-234
2 Johnson G R,Cook W H.A constitutive model and data for metals subjected to large strains,high strain rates and high temperatures[C]//The Proceedings of the 7th Inter national Symposium on Ballistics.Hague:International Ballistics Committee,1983:541-547
3于文静.导管架海洋平台钢结构在爆炸和火灾作用下的力学性能研究[D].上海:上海交通大学,2012Yu Wenjing.Study on mechanical properties of steel jacket offshore platform in blast and fire[D].Shanghai:Shanghai Jiaotong University,2012
4黄丹,章青,郭乙木.α-Fe和Ni纳米丝单向拉伸过程的分子动力学模拟[J].兵器材料科学与工程,2006,29(5):12-15Huang Dan,Zhang Qing,Guo Yimu.Molecular dynamics simulation for axial tension process ofα-Fe and Ni nano wires[J].Ordnance Material Science and Engineering,2006,29(5):12-15
5 Tomar V,Zhou M.Analyses of tensile deformation of nanocrystallineα-Fe2O3+fcc-Al composites using molecular dynamics simulations[J].Journal of the Mechanics&Physics of Solids,2007,55(5):1053-1085
6 Sainath G,Choudhary B K.Molecular dynamics simulations on size dependent tensile deformation behaviour of[110]oriented body centered cubic iron nanowires[J].Materials Science&Engineering A,2015,640(2778):98-105
7 Veiga R G A,Perez M,Becquart C S.Atomistic modeling of carbon Cottrell atmospheres in bcc iron[J].Journal of Physics Condensed Matter,2013,25(2):025401
8 Zhu L S,Zhao S J.Influence of Ni on Cu precipitation in Fe-Cu-Ni ternary alloy by an atomic study[J].Chinese Physics B,2014,23(6):193-198
9 Molnar D,Binkele P,Hocker S,et al.Atomistic multiscale simulations on the anisotropic tensile behaviour of copper-alloyed alpha-iron at different states of thermal ageing[J].Philosophical Magazine,2012,92(5):586-607
10 Horstemeyer M F,Baskes M I,Plimpton S J.Length scale and time scale effects on the plastic flow of fcc metals[J].Acta Materialia,2001,49(20):4363-4374
11 Hoover W G.Generalization of Nose's isothermal molecular dynamics:Non-Hamiltonian dynamics for the canonical ensemble[J].Physical Review A,1989,40(5):2814-2815
12 Hepburn D J,Ackland G J.Metallic-covalent interatomic potential for carbon in iron[J].Physical Review B Condensed Matter,2008,78(16):165115
13韩悌信,曾祥国,黄了,等.管道钢微观变形失效机理的分子动力学研究[J].四川大学学报(自然科学版),2016,53(4):865-874Han Tixin,Zeng Xiangguo,Huang Liao,et al.The molecular dynamics simulation of pipe steel micro-deform failure[J].Journal of Sichuan University(Nature Science Edition),2016,53(4):865-874
14代东亮,布欣,王新武.钢材高温下应力-应变曲线研究[J].洛阳理工学院学报(自然科学版),2011,21(1):14-18Dai Dongliang,Bu Xin,Wang Xinwu.Study on the stress-strain curves of steel under high temperature[J].Journal of Luoyang Institute of Science and Technology(Nature Science Edition),2011,21(1):14-18
15陈俊岭,舒文雅,李金威.Q235钢材在不同应变率下力学性能的试验研究[J].同济大学学报(自然科学版),2016,44(7):1071-1075Chen Junling,Shu Wenya,Li Jinwei.Experimental study on dynamic mechanical property of Q235 steel at different strain rates[J].Journal of Tongji University(Nature Science),2016,44(7):1071-1075
2 Johnson G R,Cook W H.A constitutive model and data for metals subjected to large strains,high strain rates and high temperatures[C]//The Proceedings of the 7th Inter national Symposium on Ballistics.Hague:International Ballistics Committee,1983:541-547
3于文静.导管架海洋平台钢结构在爆炸和火灾作用下的力学性能研究[D].上海:上海交通大学,2012Yu Wenjing.Study on mechanical properties of steel jacket offshore platform in blast and fire[D].Shanghai:Shanghai Jiaotong University,2012
4黄丹,章青,郭乙木.α-Fe和Ni纳米丝单向拉伸过程的分子动力学模拟[J].兵器材料科学与工程,2006,29(5):12-15Huang Dan,Zhang Qing,Guo Yimu.Molecular dynamics simulation for axial tension process ofα-Fe and Ni nano wires[J].Ordnance Material Science and Engineering,2006,29(5):12-15
5 Tomar V,Zhou M.Analyses of tensile deformation of nanocrystallineα-Fe2O3+fcc-Al composites using molecular dynamics simulations[J].Journal of the Mechanics&Physics of Solids,2007,55(5):1053-1085
6 Sainath G,Choudhary B K.Molecular dynamics simulations on size dependent tensile deformation behaviour of[110]oriented body centered cubic iron nanowires[J].Materials Science&Engineering A,2015,640(2778):98-105
7 Veiga R G A,Perez M,Becquart C S.Atomistic modeling of carbon Cottrell atmospheres in bcc iron[J].Journal of Physics Condensed Matter,2013,25(2):025401
8 Zhu L S,Zhao S J.Influence of Ni on Cu precipitation in Fe-Cu-Ni ternary alloy by an atomic study[J].Chinese Physics B,2014,23(6):193-198
9 Molnar D,Binkele P,Hocker S,et al.Atomistic multiscale simulations on the anisotropic tensile behaviour of copper-alloyed alpha-iron at different states of thermal ageing[J].Philosophical Magazine,2012,92(5):586-607
10 Horstemeyer M F,Baskes M I,Plimpton S J.Length scale and time scale effects on the plastic flow of fcc metals[J].Acta Materialia,2001,49(20):4363-4374
11 Hoover W G.Generalization of Nose's isothermal molecular dynamics:Non-Hamiltonian dynamics for the canonical ensemble[J].Physical Review A,1989,40(5):2814-2815
12 Hepburn D J,Ackland G J.Metallic-covalent interatomic potential for carbon in iron[J].Physical Review B Condensed Matter,2008,78(16):165115
13韩悌信,曾祥国,黄了,等.管道钢微观变形失效机理的分子动力学研究[J].四川大学学报(自然科学版),2016,53(4):865-874Han Tixin,Zeng Xiangguo,Huang Liao,et al.The molecular dynamics simulation of pipe steel micro-deform failure[J].Journal of Sichuan University(Nature Science Edition),2016,53(4):865-874
14代东亮,布欣,王新武.钢材高温下应力-应变曲线研究[J].洛阳理工学院学报(自然科学版),2011,21(1):14-18Dai Dongliang,Bu Xin,Wang Xinwu.Study on the stress-strain curves of steel under high temperature[J].Journal of Luoyang Institute of Science and Technology(Nature Science Edition),2011,21(1):14-18
15陈俊岭,舒文雅,李金威.Q235钢材在不同应变率下力学性能的试验研究[J].同济大学学报(自然科学版),2016,44(7):1071-1075Chen Junling,Shu Wenya,Li Jinwei.Experimental study on dynamic mechanical property of Q235 steel at different strain rates[J].Journal of Tongji University(Nature Science),2016,44(7):1071-1075