GRTP射出成形品の離型時における変形解析(<小特集>強化プラスチックス小特集)

概要

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Weld lines, incomplete filling and warp are some of the serious problems in injection moulding of FRTP (Fiber Reinforced Thermoplastics). In this study,it was tried to establish a method of deformation analysis useful to predict the out-of-plane deflections. By considering a state of fiber orientation, the material constants for the analysis were determined from experiments, and the analytical results were compared with the experimental ones for the specimens of simple disk shape. The following conclusions were obtained. (1) The material constants of FRTP greatly depend on the state of fiber orientation, being nearly isotropic in the case of low values of orientation factor, but becoming strongly anisotropic with increasing orientation factor. (2) Warp in a specimen is determined by two factors, the anisotropy of thermal contraction and the stiffness of materials. The mode of warp depends upon the state of fiber orientation. (3) From the comparison of the analytical result with the experimental one, it is found that this deformation analysis satisfactorily predicts the deformation mode and the deflection in the specimen. (4) The above results are expected to bring a considerable improvement in injection moulding technology.
社団法人日本材料学会の論文
1986-05-15