Abstract
It is very important to estimate the neck formation and neck propagation behavior of plastic molded materials in the field of polymer processing. In a previous paper, to evaluate the results on the neck formation and neck propagation behavior for polybutylene terephthalate (PBT) molding in uniaxial tensile test, a numerical model based on the Finite Element Method (FEM) was developed. However, there are some difficulties in determining material properties. In order to overcome them, the authors developed the determination technique for the material properties from not only load-displacement behavior but also the strain distribution around the necked region analyzed by Digital Image Correlation (DIC). Then, it was confirmed that the numerical results under the calculated elasto-plastic constitutive law show good agreement with both experimental load-displacement behavior and strain distribution around the necked region.
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