A polyethylene cylindrical rod with lamellar structure is loaded with tension-torsion combined stress. The orientation behaviour of the crystallites is evaluated by an improved orientation distribution function. The function assumes affine deformation and that the orthogonal relation of the three crystallographic axes is maintained during deformation. The improved function is achieved by assuming that slippage deformation occurs in a crystallite block. For cases in which twist is strong and samples are highly deformed, the orientation behaviour is interpreted by taking into account the slippage deformation of the (1 1 0) plane. This, with the assumption of spiral orientation of the chain axis and rotation of the a- and b-axes around the c-axis, results in good agreement between calculation and experimental results.
Посилання на статтю:
Analysis of orientation mechanism of crystallites in polyethylene cylindrical rod under tension-torsion combined stress / Takeshi Katagiri, Masanobu Sugimoto, Eiji Nakanishi* and Sadao Hibi // Polymer. – 1993. – Vol 34. – P. 2467-2474.