ベジエ曲線を利用した非線形材料データ作成方法の検討

抄録

Stress-strain curve (SS curve) for some polymer materials are characterized by softening behavior accompanied with necking deformation and re-hardening behavior before rupture. Since non-uniform deformation of specimen is observed with the behaviors mentioned above, it is challenging to identify material input parameters for non-linear finite element method solver from experimental results. Although employing an optimization tool is effective for the identification of material parameters, it is necessary to approximate SS curve into an appropriate certain function with design variables. It is found that approximating SS curve of some polymer materials into several Bezier curves and choosing of design variables proposed here are good in identifying non-linear material properties.