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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50100

    Title: Influence of Process Conditions on Tensile Properties Polyoxymethylene Composite
    Authors: Hsu,CI;Hwang,JR;Ting,PH
    Contributors: 機械工程學系
    Date: 2010
    Issue Date: 2012-03-27 17:03:28 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 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.
    Appears in Collections:[機械工程學系] 期刊論文

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