OUT-OF-PLANE BIAXIAL TESTS OF THERMOPLASTICS

M. Leonhartsberger, M. Reiter, Z. Major

Abstract

To determine the biaxial deformation and failure behavior of elastomers and thermoplastics a novel testing device along with data acquisition and data reduction software tool was developed and the first results are described in this study. Thin disc shaped specimens are pressurized and in the bulge an out-of-plane biaxial displacement state is realized. Due to the compact form, full-field optical measurements are also possible and were used for determining the biaxial strain components in these experiments. In addition to the monotonic pressure control, cyclic tests with various loading shape can also be performed. The comparison between two polypropylene grades revealed differences both regarding the biaxial yield stress and the volume strain in the post-yield regime.

Keywords

bulge tests, thermoplastics, measurement of biaxial strain, calculation of true stress

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IMEKO-YSESM-2012-25.pdf

DOI

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IMEKO TC

TC15 - Experimental Mechanics

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