熱可塑性樹脂のクリープ変形挙動に対する一般化Maxwellモデルの適用性検討

抄録

Vacuum molding process is suitable for large thermoplastic parts production. The molding time of this process is relatively long, so the creep deformation and stress relaxation are occurred simultaneously. Since forming conditions affect dimensional accuracy, trial and error are generally necessary for setting the molding conditions.

The purpose of this study is to develop the forming simulation technology considering creep deformation and stress relaxation phenomena in vacuum forming, and the applicability of the “Generalized Maxwell Model” to thermoplastics, which are viscoelastic materials, was verified. Concretely, on dimensional change of element test loaded and unloaded with constant stress, structural analysis results incorporating “Generalized Maxwell Model” was compared with creep test results to evaluate validity of analysis.