| Summary: | 碩士 === 國立臺灣科技大學 === 工程技術研究所 === 80 ===
In this study, 12k carbon fiber was chosen as reinforcement, and BMI as matrix, and orthogonal nonwoven type of weave model was used to make strucure of woven, for three-dimensional composites. The purposes of this study were to investgate mechanical of properties to analyze fracture behavious, to understand weave physical properties and fracture model.
In this experiment, 3D (3dirction) and 5D (direction) were used to weave fabric preform, with four densities of woven----3.75mm, 5mm, 6.25mm, 7.5mm. After resin was reinforced by fabric preform, we compare the differences among their mechanical properties, for best use.
Experimental results showed that the tensile strength contorlled by x-axis fibers of 3D-7.5mm was the best than the others, and it was about 1.28 folds of 3D-3.75mm.
In contrast, the cochanical properties of 3D-3.75mm was best in flexural strength and shear strength, because the Z-axis fiber strands could inhibit crack growth and make linking-effect.
Type of weave model 3D-3.75mm combining better resistant structure and higher density of woven possessed higher C.A.I value.
In bending fatigue, resistances of 3D were superior than those of 5D. The strength of 3D-7.5mm was the highest than strengths of the others.
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