Characterization of polymers by bubble inflation

Jens Horslund Christensen, Henrik K. Rasmussen, Erik Michael Kjær, Carsten Linding Lauridsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    In order to characterise materials using a simple and relative inexpensive method, the bubble inflation technique was modified.

    A polymer plate is clamped between a Teflon coated heating plate and a heated cylinder. By applying air through the heating plate the polymer membrane deforms into the cylinder. The top position of the membrane is monitored by fibreoptic sensors positioned in the cylinder. The pressure difference across the membrane is measured as well.

    The deformation in this inflation device is nonuniform and is only equal biaxial in the top of the deformed membrane. Due to this, the response is modelled using a finite element method in 3D Cartesian coordinates. The K-BKZ constitutive equation is used to model the nonlinear properties of the material. Using linear viscoelastic properties from oscillatory shear measurements and measurements of the bubble inflation, estimation of the strain dependence in the constitutive equation is possible.
    Original languageEnglish
    Title of host publicationANTEC '99: Plastics Bridging the Millennia, Conferance Proceedings : Materials
    Place of PublicationBrookfield, Connecticut, USA
    PublisherThe Society of Plactic Engineers
    Publication date1999
    ISBN (Print)1-56676-804-7
    Publication statusPublished - 1999
    EventAnnual Technical Conference of the SPE on Plastics Bridging the Millennia - New York (NY), United States
    Duration: 2 May 19996 May 1999
    Conference number: 57


    ConferenceAnnual Technical Conference of the SPE on Plastics Bridging the Millennia
    Country/TerritoryUnited States
    CityNew York (NY)


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