プラスチックフィルムのネック伝ぱ解析（１）―ネック伝ぱ現象の構成則―
Numerical Analysis for Neck Propagation of Plastic Films (1) -Constitutive Law of Neck Propagation Phenomenon-
野々村千里・鈴木利武・石原英昭
Nonomura, Chisato / Suzuki, Toshitake / Ishihara, Hideaki
The analysis of large deformation behavior of polymers is regarded as one of the most important subjects in the fields of film and fiber processing.
Neck formation and neck propagation as unique characteristics in large deformation of polymers was investigated by use of the finite element method (FEM). In the course of this study, a detailed analysis of the relationship between the criteria of the occurrence of neck propagation and an unique constitutive law for polymers was carried out.
From the analysis, the following results were obtained ;
(1) Neck propagation occurs by a steep rise of the tangent modulus in the plastic deformation region.
(2) The occurrence of neck propagation was determined by the ratio of yield stress and tangent modulus just after the yield point.
Key words: Neck formation / Neck propagation / Large deformation / Constitutive law / Finite element method