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本文对碳纤维增强复合材料O°、±45°和0°/ 90°铺层的无缺口、有直边缺口、有中心圆孔和有中心缺口层板,作了静态拉伸试验研究。采用超声波扫描成象检测方法,检测了碳/环氧复合材料在不同加载区域内的损伤分布及损伤程度,得到了载荷—损伤程度曲线和材料内部缺陷分布的分层图象。结果表明:带有垂直于载荷方向直边缺口的试件在受静态拉伸时,裂缝不是沿缺口长度方向作自相似扩展,而是沿纤维方向的界面扩展,缺口基本上不影响试件无缺口部分的承载能力;对于带中心缺口的试件,首先出现缺口尖端的界面分离;带中心圆孔的试件,损伤从孔周开始,逐渐沿纤维方向扩展。本文还分析了试件的损伤和破坏机理。
In this paper, the uniaxial, oval, straight circular and center-notched laminates of carbon fiber reinforced composites at 0 °, ± 45 ° and 0 ° / 90 ° are studied. Ultrasonic scanning imaging was used to detect the damage distribution and the damage degree of carbon / epoxy composites in different loading regions. The layered images of the load - damage degree curves and the distribution of internal defects were obtained. The results show that when the specimens with the straight edges perpendicular to the load direction are subjected to static tensile loading, the cracks do not self-similarly extend along the length of the notches but extend along the fiber direction. The notches basically do not affect the specimens For the specimen with the center notch, firstly, the interface of the notch tip is separated; For the specimen with the center hole, the damage gradually spreads along the fiber direction from the periphery of the hole. The article also analyzes the damage and failure mechanism of the specimen.