二次元積層板複合材料在積層板的平面方向提供最佳性質，但是厚度方向的強度則較為薄弱。為了提高複合材料厚度方向之層間剪強力及抗衝擊強度等性質，乃應用纖維組織結構變化，提供厚度方向的補強，而成為三次元織物。三次元織物結構複合材的獨特性能是在厚度方向的強化，而此方向的強化將能減低積層複合材料層間破壞之現象。本研究以此三次元織物為補強材來強化BMI樹脂，探討不同結構變化對複合材料物性之影響，其中包括：抗張強度(Tensile strength)、短樑剪強力(short beam shear strength)、彎曲強度(Flexural strength)及抗衝擊強度(Impact strength)等機械性質的測試及以SEM觀察分析其破壞模式。

由實驗結果顯示，三次元織物複合材料之抗張強度及彎曲強度隨織物織密之增加而提高，而3D結構比5D結構之強度高。由於Z軸紗束有抑制裂縫成長之效應，故三次元織物複合材料之短樑前強力遠高於二次元複合材料。在衝擊特性方面，三次元織物複合材料其抗衝擊性能比二次元複合材料優異，最大負荷值提高約1.66倍，總吸收能量提高約1.68倍。三次元織物複合材料由於在z軸方向的纖維補強，致使其破壞機構不像二次元織物複合材料的脫層破壞(Delamination failure)，而是一混合模式包括：界面脫鍵(Interfacial debonding)纖維彎曲(Fiber buckling)及剪力扭結破壞(Shear kink failure)。

Traditional two-dimensional (2-D) laminate composites offer the highest properties in the plane of reinforcement, so get poor through-the-thickness strength. In order to raise the interlaminar shear strength and impact strength of convensional 2-D composites, the structural variety of text-lie was applied, to provide the reinforcement of through-the-thickness. An unique characteristic of three-dimensional fabric composites is the through-the-thickness reinforcement which is responsible for reducing interlaminar failure, often occuring in laminar composites. In this study, the BMI resin is reinforced by three-dimensional fabrics. The purpose of this pater is to investigate the effects of various structures on physical properties, such as the measurement of tensile strength , short beam shear strength, flexural strength, impact strength, and the obserbation of SEM were discussed. Experimental results show that the tensile strength and flexural strength of three-dimensional fabric composites increase with the increasing of the spacing between two Z-directional yarn bundle, and the strength of 3D structures are greater than those of 5D structures. Since the Z-directional fibers have the resistant effect of crack propagation, the short beam shear strength of three-dimensional composites is more greater than two-dimensional composites. The impact properties of three-dimensional composites are better than two-dimensional composites. The failure mode changes from the predominant delamination type in the 2-D laminates to other modes such as interfacial debonding, fiber buckling, and shear kink failure in the three-dimensional composites.

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