| 纳米金属丝拉伸破坏及其应变率效应 |
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| 引用本文： | 黄丹,章青,卓家寿.纳米金属丝拉伸破坏及其应变率效应[J].固体力学学报,2006(Z1). |
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| 作者姓名： | 黄丹 章青 卓家寿 |
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| 作者单位： | [1]河海大学土木工程学院工程力学系 [2]南京 |
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| 基金项目： | 国家自然科学基金(10572125)，国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(50539090)，河海大学引进人才科研启动基金资助 |
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| 摘 要： | 建立了适于研究纳米金属快速变形破坏过程的分子动力学模型,并对不同应变率工况下不同截面尺寸单晶镍纳米丝的零温单向拉伸破坏过程进行了分子动力学模拟.模拟得到各种纳米镍丝的应力-应变曲线、屈服应变、屈服强度、断裂强度和初始弹性模量,提出了纳米金属丝快速变形力学性能的应变率效应预测公式并加以验证.计算表明金属纳米丝的屈服应变与尺寸和应变率无关,屈服强度、断裂强度和弹性模量与应变率呈对数关系.
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| 关 键 词： | 纳米金属 力学性能 分子动力学 应变率效应 |
FAILURE PROCESS AND EFFECT OF STRAIN RATE ON MECHANICAL PROPERTIES OF NANOCRYSTALLINE METAL WIRES UNDER UNI-AXIAL TENSION |
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| Huang Dan Zhang Qing Zhuo Jiashou.FAILURE PROCESS AND EFFECT OF STRAIN RATE ON MECHANICAL PROPERTIES OF NANOCRYSTALLINE METAL WIRES UNDER UNI-AXIAL TENSION[J].Acta Mechnica Solida Sinica,2006(Z1). |
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| Authors: | Huang Dan Zhang Qing Zhuo Jiashou |
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| Abstract: | The failure process of nanocrystalline nickel wires under uni-axial tension without heat activation was analyzed by molecular dynamics method.Simulation obtains the stress-strain curve,yield strain and strength,fracture strength and initial elastic modulus of each nano-wire with different cross-section size and different strain rate.A forecasting formula on mechanical properties of nano metal affected by strain rate was put forward and verified.Analysis shows that the yield strain of nanocrystalline metal wire is independent of cross-section size and strain rate,and yield strength,fracture strength and elastic modulus are logarithmic versus strain rate. |
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| Keywords: | nanocrystallilne metal mechanical properties molecular dynamics strain rate effect |
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