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    Analysis of the Real Area of Contact Between a Polymeric Magnetic Medium and a Rigid Surface

    Source: Journal of Tribology:;1984:;volume( 106 ):;issue: 001::page 26
    Author:
    Bharat Bhushan
    DOI: 10.1115/1.3260862
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The statistical analysis of the real area of contact proposed by Greenwood and Williamson is revisited. General and simplified equations for the mean asperity real area of contact, number of contacts, total real area of contact, and mean real pressure as a function of apparent pressure for the case of elastic junctions are presented. The critical value of the mean asperity pressure at which plastic flow starts when a polymer contacts a hard material is derived. Based on this, conditions of elastic and plastic junctions for polymers are defined by a “polymer” plasticity index, Ψp which depends on the complex modulus, Poisson’s ratio, yield strength, and surface topography. Calculations show that most dynamic contacts that occur in a computer-magnetic tape are elastic, and the predictions are supported by experimental evidence. Tape wear in computer applications is small and decreases Ψp by less than 10 percent. The theory presented here can also be applied to rigid and floppy disks.
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      Analysis of the Real Area of Contact Between a Polymeric Magnetic Medium and a Rigid Surface

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    http://yetl.yabesh.ir/yetl1/handle/yetl/99106
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    contributor authorBharat Bhushan
    date accessioned2017-05-08T23:19:00Z
    date available2017-05-08T23:19:00Z
    date copyrightJanuary, 1984
    date issued1984
    identifier issn0742-4787
    identifier otherJOTRE9-28432#26_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/99106
    description abstractThe statistical analysis of the real area of contact proposed by Greenwood and Williamson is revisited. General and simplified equations for the mean asperity real area of contact, number of contacts, total real area of contact, and mean real pressure as a function of apparent pressure for the case of elastic junctions are presented. The critical value of the mean asperity pressure at which plastic flow starts when a polymer contacts a hard material is derived. Based on this, conditions of elastic and plastic junctions for polymers are defined by a “polymer” plasticity index, Ψp which depends on the complex modulus, Poisson’s ratio, yield strength, and surface topography. Calculations show that most dynamic contacts that occur in a computer-magnetic tape are elastic, and the predictions are supported by experimental evidence. Tape wear in computer applications is small and decreases Ψp by less than 10 percent. The theory presented here can also be applied to rigid and floppy disks.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAnalysis of the Real Area of Contact Between a Polymeric Magnetic Medium and a Rigid Surface
    typeJournal Paper
    journal volume106
    journal issue1
    journal titleJournal of Tribology
    identifier doi10.1115/1.3260862
    journal fristpage26
    journal lastpage34
    identifier eissn1528-8897
    treeJournal of Tribology:;1984:;volume( 106 ):;issue: 001
    contenttypeFulltext
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