結晶性ポリマに対する結晶成長則の検討および寸法依存性に関する分子鎖塑性FEM解析

抄録

Crystalline polymers may have some size effects that show different deformation responses depending on size of crystalline phase with respect to that of specimen. In the previous report, the effect of difference in crystal size on deformation response is investigated conducting some tensile tests on a polypropylene specimen. However, there are some problems that the shape of crystalline phase in the unit cell is different from the shape of crystalline phase of PP observed in the experiment and the reason why the size of crystalline phase becomes larger as the cooling temperature is lower cannot be clarified. In the present report, the authors change the shape of crystalline phase in the unit cell and attempt to conduct the molecular chain plasticity FE by analysis applying the new unit cell. Furthermore, the reason for the size increase of crystalline phase at low cooling temperature is quantitatively explained on the basis of classic nucleation theory. In addition, it is indicated that experimental stress-strain curves are numerically reproduced.