Transient Networkモデルを用いた有限要素解析によるポリアミドの機械的性質に及ぼす分子鎖構造と結晶化度の影響の評価

抄録

Polyamide (PA) is a semi-crystalline polymer in which main chain is configured by repeating units of amide bonds (-NHCO-). The strength of PA is achieved by intermolecular hydrogen bond between hydrogen and oxygen atoms of amide bonds. In this study, the effects of the crystallinity and crystallite size were investigated by uniaxial tensile tests of commercial PA6 and PA-MXD10. Furthermore, the time-dependent nonlinear mechanical model based on the transient network model was proposed to predict the mechanical behavior of PAs with different crystallinities. From experimental results, the stress-strain curves of the PAs with small crystallinity showed the sharp drop after the maximum stress and the necking occurred due to local deformation. In contrast, near the maximum stress of PA with large crystallinity, a gradual change in stress was observed, and the local deformation was suppressed. Simulation results indicated that the modified transient network model can predict the mechanical behavior of PAs with different crystallinities.