Influence of fiber volume fraction on mode III interlaminar fracture toughness of glass/epoxy composites
Influence of fiber volume fraction on mode III interlaminar fracture toughness of glass/epoxy composites
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DOI：
10.1016/j.compscitech.2003.10.008
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发表时间：
2004-07
影响因子：
9.1
通讯作者：
Xiaoming Li;L. Carlsson;P. Davies
中科院分区：
文献类型：
--
作者：
Xiaoming Li;L. Carlsson;P. Davies
使用边缘裂纹扭转试样检查了纤维体积分数对玻璃/环氧树脂复合材料的 III 型层间断裂韧性 (GIIIC) 的影响。结果发现，随着纤维体积分数的降低，与裂纹扩展起始相对应的 GIIIC 显着增加。用光学显微镜和扫描电子显微镜检查破碎样品的断裂表面。低纤维体积分数复合材料的较高初始断裂韧性归因于基体体积的增加，允许在宏观裂纹扩展之前增加基体树脂中的塑性变形能量耗散。除了初级分层裂纹外，低纤维体积分数和高纤维体积分数试件在与裂纹平面相邻的90°层中都显示出层内基体裂纹，并且此类裂纹在低纤维体积分数试件中特别多，这有助于抵抗裂纹扩展。
The influence of fiber volume fraction on the mode III interlaminar fracture toughness, GIIIC, of a glass/epoxy composite was examined using the edge-cracked torsion specimen. It was found that GIIICcorresponding to onset of crack propagation substantially increased with decreasing fiber volume fraction. The fracture surfaces of broken specimens were inspected in optical and scanning electron microscopes. The higher initiation fracture toughness for the low fiber volume fraction composite is attributed to the increased matrix volume allowing for increased plastic deformation energy dissipation in the matrix resin prior to macroscopic crack propagation. In addition to the primary delamination crack, both the low and high fiber volume fraction specimens displayed intralaminar matrix cracks in the 90° plies adjacent to the crack plane, and such cracks were particularly numerous in the low fiber volume fraction specimens which contribute to the resistance to crack propagation.