本研究利用原始未含纖PBT材料以及9vol.%與19vol.%短玻璃纖維強化PBT複合材料之射出成型試片，探討纖維強化機構及其對於拉伸性質以及破壞韌性之影響，實驗結果發現纖維體積分率對於平行試片拉伸方向的纖維組織層厚具有顯著的影響，但是射出成型參數的影響並不顯著。原始未含纖PBT基材在加入短玻璃纖維後，抗拉強度、楊氏係數、降伏強度以及破壞韌性會明顯提昇，但是隨著短玻璃纖維體積分率的增加，破壞韌性增加的趨勢會逐漸減緩。此外，本研究亦利用拉伸試驗與破壞韌性試驗之實驗數據建立抗拉強度、楊氏係數以及破壞韌性預測模式，並以田口實驗數據以及短玻璃纖維強化聚碳酸酯複合材料實驗數據進行驗證，驗證結果發現預測值與實驗值誤差在3%~8%以內，顯示本研究之預測模式應可應用於其他短纖維強化複合材料的抗拉強度、楊氏係數以及破壞韌性的預測，但未來仍需透過其他更多短纖維強化複合材料的實驗數據作進一步的驗證。

This study investigates the influence of various injection molding process parameters and fiber amount on the tensile properties and fracture toughness of short fiber reinforced Polybutylene Terephthalate (PBT). Three materials of various fiber amounts, neat PBT, 9vol.% and 19vol.% short fiber-reinforced PBT composites, were used in this study. It is found that the addition of short glass fibers can significantly strengthen neat PBT. The fracture toughness of neat PBT was significantly increased by the addition of short glass fibers. However, the variation of injection molding design parameter had little effect on the tensile properties and fracture toughness. The strength depends on the thickness of the layer where fibers oriented in the loading direction. The layer thickness is strongly affected by the fibre amount. The prediction model was built by the PBT and verified with Taguchi and PC/GF experimental data. The result finds the predicted value is close to experiment value and shows the prediction model can be used to predict other short fibre-reinforced compsites’ tensile properties and fracture toughness. However, more experiment data still needs to do futher verification.

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