A New Scale of Microtension Test for Polymers

    Volume 10, Issue 3 (May 1982)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 5


    Groves, DJ
    Senior research physicist, senior research chemist, and physicist, Imperial Chemial Industries PLC., Welwyn Garden City, Hertfordshire

    Sang, RD
    Postdoctoral fellow and reader, University of Southampton, Southampton, Hampshire

    Scott, JT
    Senior research physicist, senior research chemist, and physicist, Imperial Chemial Industries PLC., Welwyn Garden City, Hertfordshire

    Scrutton, IN
    Senior research physicist, senior research chemist, and physicist, Imperial Chemial Industries PLC., Welwyn Garden City, Hertfordshire

    Millie, RP
    Undergraduate student and senior lecturer, University of Southampton, Southampton, Hampshire

    Wigley, DA
    Undergraduate student and senior lecturer, University of Southampton, Southampton, Hampshire

    Hendra, PJ
    Postdoctoral fellow and reader, University of Southampton, Southampton, Hampshire

    Abstract

    Microtension tests on polyethylene, polypropylene, and polyethylene terephthalate are reported for grip separations typically around 10 mm and as little as 4 mm. A waist geometry of uniform radius is used and particular attention to grips and jaw facings is necessary. The results show these microtension specimens to behave in accordance with predictable sources of stress concentration, giving yield and draw processes free from grip influence. There is a small though significant decrease of around 2% when the mean values of yield or draw stress from the microtest are compared with conventional test data, although the testing errors are similar. The mean value of break strength is unaffected whether the microtest or conventional test is used, but the scatter about it is larger with the microtest. For many purposes the differences are small, and the material sample needed is considerably reduced.


    Paper ID: JTE10241J

    DOI: 10.1520/JTE10241J

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    Author
    Title A New Scale of Microtension Test for Polymers
    Symposium , 0000-00-00
    Committee D30