An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method

IMR OpenIR

	An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method
	Y. F. Shao; S. Q. Wang
	2010
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	26 期号:1 页码:56-64
摘要	Nanoindentation simulations on single crystals Al and Cu via the quasicontinuum method have been performed. Two kinds of atomic-level local stress calculation methods, i.e. the coarse-grained local stress and the virial local stress, are employed to calculate the stress state of the contact area. Various comparisons between the coarse-grained local stress and the virial local stress have been made. Firstly, the averaged normal stress beneath the contact surface calculated by coarse-grained method agrees well with continuum mechanical pressure measurement, while the virial method gives unphysical results sometimes. Secondly, the coarse-grained results reflect the indenter size effect on the critical shear stress quite accurately, while the virial calculations fail. Thirdly, the distribution of maximum shear stress of the coarse-grained method predicts the defects nucleation locations reliably, while the distribution of virial local stress gives an incorrect prediction sometimes. Thus it is concluded that the coarse-grained method can offer a more reliable description of the local stress states of atoms in spatially inhomogeneous solids.
部门归属	[shao, yufei; wang, shaoqing] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;shao, yf (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;y.f.shao@hotmail.com sqwang@imr.ac.cn
关键词	Nanoindentation Atomistic Stress Quasicontinuum Molecular-dynamics Dislocation Nucleation Mechanical-properties Incipient Plasticity Indentation Size Elastic-modulus Solids Nanohardness Deformation Defects
URL	查看原文
WOS记录号	WOS:000274489800009
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31431
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. F. Shao,S. Q. Wang. An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method[J]. Journal of Materials Science & Technology,2010,26(1):56-64.
APA	Y. F. Shao,&S. Q. Wang.(2010).An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method.Journal of Materials Science & Technology,26(1),56-64.
MLA	Y. F. Shao,et al."An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method".Journal of Materials Science & Technology 26.1(2010):56-64.