| MULTIAXIAL BEHAVIOR OF NANOPOROUS SINGLE CRYSTAL COPPER： A MOLECULAR DYNAMICS STUDY |
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| 作者单位： | Kejie Zhao(The MOE Key Laboratory,School of Aerospace,Xi'an Jiaotong University,Xi'an 710049,China;School of Engineering and Applied Science,Harvard University,Cambridge,Massachusetts 02138,USA);Liangliang Fan(The MOE Key Laboratory,School of Aerospace,Xi'an Jiaotong University,Xi'an 710049,China);Changqing Chen(Department of Engineering Mechanics,AML,Tsinghua University,Beijing 100084,China) |
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| 基金项目： | the National Natural Science Foundation of China，the National Basic Research Program of China，the National High Technology Research and Development Program of China |
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| 摘 要： | The stress-strain behavior and copper are studied by the molecular dynamics incipient yield surface of nanoporous single crystal （MD） method. The problem is modeled by a periodic unit cell subject to multi-axial loading. The loading induced defect evolution is explored. The incipient yield surfaces are found to be tension-compression asymmetric. For a given void volume fraction, apparent size effects in the yield surface are predicted： the smaller behaves stronger. The evolution pattern of defects （i.e., dislocation and stacking faults） is insensitive to the model size and void volume fraction. However, it is loading path dependent. Squared prismatic dislocation loops dominate the incipient yielding under hydrostatic tension while stacking-faults are the primary defects for hydrostatic compression and uniaxial tension/compression.
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| 关 键 词： | 应力应变行为 分子动力学 纳米多孔 单晶铜 多轴 缺陷演化 屈服面 轴向载荷 |
MULTIAXIAL BEHAVIOR OF NANOPOROUS SINGLE CRYSTAL COPPER:A MOLECULAR DYNAMICS STUDY |
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| Kejie Zhao , Liangliang Fan Changqing Chen. MULTIAXIAL BEHAVIOR OF NANOPOROUS SINGLE CRYSTAL COPPER:A MOLECULAR DYNAMICS STUDY[J]. Acta Mechanica Solida Sinica, 2009, 22(6): 650-656. DOI: 10.1016/S0894-9166(09)60395-5 |
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| Authors: | Kejie Zhao Liangliang Fan Changqing Chen |
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| Affiliation: | Kejie Zhao 1,2 Liangliang Fan 1 1(The MOE Key Laboratory,School of Aerospace,Xi'an Jiaotong University,Xi'an 710049,China) 2(School of Engineering and Applied Science,Harvard University,Cambridge,Massachusetts 02138,USA)Changqing Chen 3 3(Department of Engineering Mechanics,AML,Tsinghua University,Beijing 100084,China) |
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| Abstract: | The stress-strain behavior and incipient yield surface of nanoporous single crystal copper are studied by the molecular dynamics(MD) method.The problem is modeled by a periodic unit cell subject to multi-axial loading.The loading induced defect evolution is explored.The incipient yield surfaces are found to be tension-compression asymmetric.For a given void volume fraction,apparent size effects in the yield surface are predicted:the smaller behaves stronger.The evolution pattern of defects(i.e.,dislocation ... |
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| Keywords: | molecular dynamics incipient yield surface size effect dislocations nanoporous single crystal copper |
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