當複合材料應用於汽車和工業零件的行業中，複合材料零件通常通過機械固件連接，常設計具有圓孔的連接結構件，這些孔存在應力與應變集中，從而降低了複合材料的承載能力和壽命。因此，本論文研究應變與應力集中 (strain/stress concentration；SC) 對具有孔之自增強聚對苯二甲酸乙二酯 (self-reinforced poly (ethylene terephthalate)；srPET) 複合材料性能的影響。
本論文使用數位影像相關係數法 (digital image correlation；DIC)，研究具有雙邊半圓孔 (double-edge semi-circular holes；DESH) 的自增強聚酯複合材料(srPET)在不同寬度與直徑比 (width-to-diameter；W/D) 之變形範圍內應變集中因數 (strain concentration factors；Kɛ) 變化。Kɛ的值與彈性變形範圍內的理論集中係數 (theoretical concentration factor；Kt) 一致。由於塑性變形，其迅速升高，因此Kɛ的變化根據屈服範圍的分佈(從孔邊緣開始) 分為不同的階段。Kɛ 在彈性和塑性區域都隨著 W/D 的減小而下降，但當 W/D 比等於 1.5 時有一個例外，因此 W/D 大於 1.5 被推薦用於設計安全的結構韌性複合材料。在孔效應中，DESH 的 Kɛ在彈性和塑性區域均低於圓形孔 (circular holes；CH) ，故應選用具有 DESH 的複合材料作為結構應用的替代品。
第二部分為複合材料在衝擊載荷下的低能量吸收特性之研究，採用熱壓法製備兩種延展性材料，鋁和自增強聚酯複合材料和鋁的纖維與金屬複合層板 (fiber metal laminates ；FML)。在拉伸、彎曲、短梁剪切 (short beam shear；SBS)、落錘衝擊和衝擊後壓縮 (CAI) 測試下研究 FML 之力學行為。FML與 srPET 複合材料相比，FML 表現出優異的拉伸性能和極高的剛性，其拉伸強度和模量比 srPET 複合材料高出 9% 和 6 倍。FML 有高比率(83%)的吸收能量與衝擊能量，此類型的 FML 在施加高能量 (high applied energy；HE) 時提供了出色的特定吸收能量與抗穿孔力。FML在 HE 衝擊下與具施加低能量 (Low applied energy；LE) 的相比，獲得了幾乎相同的 CAI 強度但具有較高的 CAI 模量。 這些結果展現，基於環保 srPET 的 FML 具有用於各種工業應用的輕質吸收能結構的潛力。

In industries where composites can be applied in automobiles and industrial parts, they are usually joined to mechanical fasteners. Their design often includes circular holes, which introduce stress/strain concentration (SC), consequently reducing the load carrying capacity and life of the composite. Therefore, the study of SC of composites becomes important, thus, the effect of SC on the performance of srPETs with holes was studied.
The study investigated variations in strain concentration factors (Kɛ) within the full deformation range of self-reinforced poly (ethylene terephthalate) composites (srPETs) with double-edge semi-circular holes (DESH) using digital image correlation (DIC) at different width-to-diameter (W/D) ratios. The value of Kɛ agrees with the theoretical concentration factor (Kt) within the elastic deformation range; then, it increases rapidly to a peak because of plastic deformation. Therefore, the change in Kɛ was divided into different stages based on the spread of the yield extent (starting from the hole edge). The decrease in Kɛ was accompanied by a decrease in W/D in both the elastic and plastic regions; however, there was an exception when the W/D was equal to 1.5. Therefore, the geometric configuration W/D greater than 1.5 was recommended for designing secure structural ductile composites. The Kɛ of DESH is lower than that of CH in both the elastic and plastic regions for the hole effect. Thus, preference should be given to composites with DESH as an alternative for structural applications.
However, another major concern of the researcher was the low energy absorbing characteristics of the composites under impact loading. Thus, this dissertation studied the development of fiber metal laminates based on two ductile materials—aluminum and srPET composite—in its second section. FMLs were developed using the hot press manufacturing method. The mechanical behavior of the FML was examined under tensile, flexural, short beam shear (SBS), drop weight impact, and compression after impact (CAI) tests. FML showed superior tensile properties and extremely rigid behavior compared to srPET composites, providing 9% higher tensile strength and modulus 6 times higher than srPET composites. This type of FML provides excellent specific absorbed energy without impactor penetration at high applied energy (HE), because the ratio of absorbed energy to impact energy of the FML was very high (83%). The CAI test found insensitive behavior of srPET under compression. However, it also demonstrated that the FML affected at HE yielded almost the same CAI strength and higher CAI modulus than the FML affected at low applied energy (LE). These results showed that FML based on environmentally friendly srPET offers potential for use in lightweight energy-absorbing structures for various industrial applications.

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