ポリカーボネート材の塑性挙動における体積変化を考慮した数値シミュレーション

抄録

It is known that the dynamic behavior of polymers depends greatly on not only the strain rates but also the hydrostatic pressure, and the volume change is caused during plastic deformation. It is desirable to apply material constitutive model considering these mechanical properties in numerical simulation for polymers. It is however still not enough to prepare an easy-to-use material constitutive model considering these mechanical properties in general-purpose numerical simulation code. Therefore, we developed a new constitutive model for polymers and implemented using the user subroutine function of the impact analysis code LS-DYNA. And Mimura et al. measured the plastic Poisson’s ratio of Polycarbonate by Digital Image Correlation method.

In this study, we focused on the volume change during plastic deformation of Polycarbonate, applied this measured plastic Poisson’s ratio to this constitutive model and performed numerical simulation using LS-DYNA to verify the validity of this constitutive model and material parameters.