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Modeling Nanowire Indentation Test With Adhesion Effect
Zhang Y(张吟); Zhao YP(赵亚溥); Zhang, Y (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China
Source PublicationJournal of Applied Mechanics-Transactions of the ASME
2011
Volume78Issue:1Pages:11007
ISSN0021-8936
AbstractBecause of the large aspect ratio of its length to radius and the large surface area to volume ratio, the nanowire is highly flexural and susceptible to the adhesion influence. The bending deflection of nanowire and its adhesion effect make the previous indentation models inappropriate for the nanowire indentation test. In this paper, a new model incorporating the nanowire bending deflection, loading symmetry/asymmetry, and adhesion effect is presented and compared with the previous models. Because of the bending deflection of the flexural nanowire, the nanowire may lift-off/separate from its contacting elastic medium and the localized contact effects may thus be induced. The localized contact effects as predicted by this new model can cause the relatively large deflection difference of the nanowire in test as compared with those obtained by the previous models, which impacts directly and significantly on the interpretation of the indentation experimental data. The nanowire is modeled as a cylinder/beam and the indentation force is modeled as a concentrated force. The elastic medium is modeled as an elastic foundation. The elastic foundation behaves as a linear spring in nonadhesive Hertz contact and as a nonlinear softening spring in adhesive contact. In the Hertz contact, due to lift-off, the contact length is independent of the load. However, in adhesive contact, larger load results in smaller contact length. Unlike the Hertz contact in which lift-off always occurs when adhesion force is too large for bending cylinder to overcome, there is no lift-off for cylinder and the full contact scenario is thus formed. [DOI: 10.1115/1.4002305]
KeywordElastic Half-space Tensionless Contact Unbonded Contact Carbon Nanotubes Finite Beam Film Foundation Mechanics Modulus Deformation
Subject AreaMechanics
DOI10.1115/1.4002305
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000283739400007
WOS KeywordELASTIC HALF-SPACE ; TENSIONLESS CONTACT ; UNBONDED CONTACT ; CARBON NANOTUBES ; FINITE BEAM ; FILM ; FOUNDATION ; MECHANICS ; MODULUS ; DEFORMATION
WOS Research AreaMechanics
WOS SubjectMechanics
Funding OrganizationThis work is supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 10721202 and 10772180), the LNM initial funding for young investigators, the Ministry of Science and Technology (MOST) (Grant No. 2010CB631004), and the National Basic Research Program of China (973 Program, Grant No. 2007CB310500).
DepartmentLNM纳/微系统力学与物理力学
Classification一类/力学重要期刊
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/44955
Collection非线性力学国家重点实验室
Corresponding AuthorZhang, Y (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhang Y,Zhao YP,Zhang, Y . Modeling Nanowire Indentation Test With Adhesion Effect[J]. Journal of Applied Mechanics-Transactions of the ASME,2011,78(1):11007.
APA Zhang Y,Zhao YP,&Zhang, Y .(2011).Modeling Nanowire Indentation Test With Adhesion Effect.Journal of Applied Mechanics-Transactions of the ASME,78(1),11007.
MLA Zhang Y,et al."Modeling Nanowire Indentation Test With Adhesion Effect".Journal of Applied Mechanics-Transactions of the ASME 78.1(2011):11007.
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