Digital image correlation of cross-ply laminates in tension to reveal microcracking
Digital image correlation of cross-ply laminates in tension to reveal microcracking
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DOI：
10.1016/j.compstruct.2023.117148
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发表时间：
2023-05
影响因子：
6.3
通讯作者：
G. Irven;D. Carolan;A. Fergusson;J. Dear
中科院分区：
文献类型：
--
作者：
G. Irven;D. Carolan;A. Fergusson;J. Dear
研究了利用数字图像相关技术（DIC）揭示交叉层合板微结构损伤的方法。在近表面层中，基体韧性对微裂纹的控制起关键作用。实验结果表明，采用强韧性环氧聚合物作为复合材料的基体，可使复合材料的主方向模量增加。DIC提供了对交叉层合板失效的见解；模量的增加是由于横向层中微裂纹的形成。通过应变沿规长方向的变化，可以看出轴周围基体开裂的早期发生。坚韧的环氧聚合物的使用延缓了这种开裂发生的负荷。当使用未增韧的环氧聚合物作为基体时，在测试开始时可以观察到微裂纹，这表明加工引起了损伤。建议使用增韧聚合物作为复合层压板的基体来减轻这种情况。
The use of Digital Image Correlation (DIC) to reveal microstructural damage in cross-ply laminates was investigated. Matrix toughness plays a key role in governing microcracking at the tow level in near-surface plies. Experiments revealed that using a tough epoxy polymer as the matrix of the laminate resulted in increased laminate moduli in the principal directions. DIC provides insights into cross-ply laminate failure; the increase in modulus is attributed to microcrack formation in transverse plies. Early onset of matrix cracking around the tows is revealed by variations in the strain along the gauge length. The use of a tough epoxy polymer delays the load at which this cracking occurs. When an untoughened epoxy polymer is used as the matrix, microcracking can be observed at the beginning of the test, suggesting processing induced damage. The use of toughened polymers as the matrix of composite laminates is recommended to mitigate against this.