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Polymers in biaxial states of stress at various loading rates
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2011 (English)In: Conference Proceedings of the Society for Experimental Mechanics, 2011, 431-438 p.Conference paper (Refereed)
Abstract [en]

Previous uniaxial tests have shown that the viscoplastic behaviour of several polymers can be accurately described by means of the Rabotnov-Suvorova integral equation for materials with memory, for a wide range of loading rates in tension. Prediction of deformation can also be made in creep and relaxation. Present investigation concerns biaxial states of stress, achieved by simultaneously applying tensile force and torsional moment to thin-walled tubes. Results show that this constitutive equation, whose parameters were determined from uniaxial tensile tests at three different loading rates, also predicts the biaxial behaviour quite well until the torque comes close to the buckling load of the specimen. As a second verification, creep tests of a polyoximethylene membrane, subjected to hydrostatic pressure, were carried out. The validity of the equation is again confirmed.

Place, publisher, year, edition, pages
2011. 431-438 p.
, Conference Proceedings of the Society for Experimental Mechanics Series, ISSN 2191-5644 ; 6
Keyword [en]
Biaxial behaviour, Buckling loads, Creep and relaxation, Creep tests, Loading rate, Materials with memory, Tensile forces, Thin walled tubes, Torsional moment, Uniaxial tensile test, Uniaxial tests, Viscoplastic, Buckling, Creep, Hydrostatic pressure, Mechanics, Polymers, Stress analysis, Tensile testing, Loading
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-149906ScopusID: 2-s2.0-84857876339ISBN: 9781461402213OAI: diva2:744474
2011 SEM Annual Conference on Experimental and Applied Mechanics, 13 June 2011 through 16 June 2011, Uncasville, CT

QC 20140908

Available from: 2014-09-08 Created: 2014-08-28 Last updated: 2014-09-08Bibliographically approved

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Ohlson, Nils-Gunnar
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