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    题名: Influence of Process Conditions on Tensile Properties Polyoxymethylene Composite
    作者: Hsu,CI;Hwang,JR;Ting,PH
    贡献者: 機械工程學系
    关键词: FIBER-REINFORCED POLYPROPYLENE;FRACTURE-TOUGHNESS;ORIENTATION;BLENDS;WEAR;FRICTION;PLATES;POM
    日期: 2010
    上传时间: 2012-03-27 17:03:28 (UTC+8)
    出版者: 國立中央大學
    摘要: This study investigates the influence of process conditions on the tensile properties of polyoxymethylene (POM) composites that contain three amounts of glass fiber-reinforcement (0 wt%, 15wt% and 25 wt%). Four processing parameters - orientation of fiber, thickness of fiber layer, amount of fiber, and injection molding parameter were considered. The morphology of the fiber layer is observed by scanning electron microscopy (SEM), to elucidate the correlation between the orientation of the fibers and the mechanism of fracture of the bucking surface. The experimental results show that the maximum ultimate stress is obtained at a filling time of 1.5 s, a melt temperature of 215 degrees C, a mold temperature of 75 degrees C, and a packing pressure 75 MPa. SEM revealed that the composite contained two distinct layers. The fibers in the frozen layer were parallel to the melt flow, while the fiber was perpendicular to the melt flow in the core layer. The thickness of the frozen layer increased with the amount of fiber, increasing tensile strength. Additionally, fiber pullout and across-matrix cracking are the main fracture mechanisms of the frozen layer, whereas failure of the fiber-matrix interface is the major fracture mechanism in the core layer.
    關聯: JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
    显示于类别:[機械工程學系] 期刊論文

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