Abstract
The polymeric material is used in fields such as electricity and electronic parts. However, the polymeric material is inferior in rigidity, strength, and temperature property to metallic material, and it is difficult to analyze the deformation of polymer. So, it is not used in fields such as structure. If the deformation characteristic of various environments and the load conditions are clarified, the usage of polymer in structural material is expected to expand because of processability, cheapness, recyclable. In general, the research under the simple stress is done, but the resarch under a biaxial stress is not done in polymeric material. In this study, polypropylene is chosen as test piece, to examine transforming behavior under the biaxial stress. The aim of this study is to construct the constitutive model.
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