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    Transition from elastic to plastic deformation as asperity contact size is increased

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    Authors
    Yong, C. W.
    Smith, W.
    Dhir, A.
    Kendall, K.
    Issue Date
    2007-01
    
    Metadata
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    Abstract
    Contacts between a clean sodium chloride pyramidal shaped asperity and a plane NaCl surface have been investigated by molecular dynamics simulations. For small contacts, a few atoms across, the asperity jumped to contact and behaved elastically as normal load was applied. Then, when the force was reversed to detach the asperity, brittle failure occurred without any damage to the crystalline materials. However, as the contact size of the asperity was increased to 6×6 atoms in area, the mechanism of detachment was seen to alter. The jump to contact was elastic and damage free, but the separation could not be achieved elastically, but required plastic deformation, giving extensive energy dissipation and severe damage as edge defects propagated through the asperity. Above this contact size, plastic flow was dominant. However, there is clearly a further transition back to elastic fracture once the asperity becomes large enough for Griffith-type cracking to propagate above 1μm in size, since large sodium chloride contacts are known to be brittle above the micrometre scale, depending on the presence of crack initiating defects. Transition from elastic to plastic deformation as asperity contact size is increased | Request PDF. Available from: https://www.researchgate.net/publication/225130915_Transition_from_elastic_to_plastic_deformation_as_asperity_contact_size_is_increased [accessed Jul 05 2018].
    Citation
    Transition from elastic to plastic deformation as asperity contact size is increased 2007, 26 (3):235 Tribology Letters
    Publisher
    Tribology Letters
    Journal
    Tribology Letters
    URI
    http://hdl.handle.net/2436/621459
    DOI
    10.1007/s11249-007-9199-8
    Additional Links
    http://link.springer.com/10.1007/s11249-007-9199-8
    Type
    Journal article
    Language
    en
    ISSN
    1023-8883
    1573-2711
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11249-007-9199-8
    Scopus Count
    Collections
    Faculty of Science and Engineering

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