Fatigue growth of matrix cracks in the transverse direction of CFRP laminates
Fatigue growth of matrix cracks in the transverse direction of CFRP laminates
复制标题
CFRP层合板横向基体裂纹的疲劳扩展
DOI：
10.1016/s0266-3538(02)00068-4
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发表时间：
2002
影响因子：
9.1
通讯作者：
T. Ishikawa
中科院分区：
文献类型：
--
作者：
T. Yokozeki;T. Aoki;T. Ishikawa
研究了交铺层板和准各向同性增韧碳纤维复合材料层合板在循环载荷作用下的基体裂纹损伤过程。对试件的裂纹密度和裂纹长度的详细观察表明，准各向同性层合板存在边裂纹萌生、边裂纹扩展和沿宽度方向裂纹扩展的三个阶段，而正交层合板则同时发生沿宽度方向的横向裂纹萌生和扩展。利用二维解析模型，得到了与裂纹宽度方向扩展相关的能量释放率。结果表明，横向裂纹扩展行为可以用相关能量释放率的幂定律来估计。
The damage process of matrix cracks in cross-ply and quasi-isotropic toughened CFRP laminates under cyclic loading is studied. Detailed observations of both crack density and crack length in coupon specimens suggest that there is a three-stage process comprising of edge crack initiation, edge crack growth, and crack propagation across the width in quasi-isotropic laminates, whereas simultaneous transverse crack initiation and propagation in the width direction takes place in cross-ply laminates. Energy release rates associated with crack propagation in the width direction are derived using the two-dimensional analytical model. It is shown that transverse crack propagation behavior can be estimated using the power law of the associated energy release rates.