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X-ray computed tomography observation of multiple fiber fracture in unidirectional CFRP under tensile loading

机译：拉伸载荷下单向CFRP中多纤维断裂的X射线计算机断层扫描观察

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摘要

We investigated the initiation and propagation of fiber fracture in unidirectional (UD) carbon fiber-reinforced composites (CFRPs). The statistical fiber breakage of CFRPs and multiple fiber fracture (the propagation of fiber breakage near the broken fiber) have been studied and observed in specimens after fracture. To date, however, this propagation phenomenon has been rarely observed directly, and investigations have depended mainly on prediction. This direct non-destructive evaluation of fiber fracture phenomenon was performed via X-ray computed tomography of UD CFRPs. Specimens were loaded under various stress levels and imaged at low voltage (20 keV). The fiber breakages were analyzed from these images, which revealed multiple fractures leading to large clusters of broken fibers. Quantitative analyses after image processing revealed a marked increase in the number of multiple fractures, meaning the number of broken fibers in a broken fiber cluster, near the final fracture. Finally, the trend in multiple fractures was compared with the predicted results, showing reasonable agreement.
机译：我们研究了单向（UD）碳纤维增强复合材料（CFRPs）中纤维断裂的引发和扩散。已经研究并观察了断裂后样本中CFRPs的统计纤维断裂和多纤维断裂（纤维断裂在断裂纤维附近的传播）。然而，迄今为止，这种传播现象很少被直接观察到，研究主要依赖于预测。通过UD CFRP的X射线计算机断层扫描对纤维断裂现象进行了直接的无损评估。样品在各种应力​​水平下加载并在低压（20 keV）下成像。从这些图像分析了纤维的断裂，发现了多处断裂，导致大的断裂纤维簇。图像处理后的定量分析显示，多处断裂的数量显着增加，这意味着最终断裂附近的断裂纤维簇中断裂的纤维数量。最后，将多处骨折的趋势与预测结果进行了比较，显示出合理的一致性。

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