Although bolted jointsbetween aluminum alloy (Al) and carbon fiber reinforced plastic (CFRP) are often used in engineering, the specific cause of fatigue failure in these joints is still not understood. The tension–tension fatigue experiments were performed on CFRP/AL bolted single lap joints (SLJs) at high load levels in this investigation. Two stacking sequences ([±45] and [0/90, ±45]), were developed together with multiple load levels ranging from 0.75 to 0.96. Micro X-ray computed tomography (µCT) was used for non-destructive testing, three-dimensional (3D) models were reconstructed, and pores were measured and assessed to further explore the fatigue failure mechanism of CFRP. The results showed that although CFRP failed at greater load levels, Al failures occurred at lower load levels. At a ratio of 0.923 to 0.95, a competitive failure was also observed. The results of CT analysis showed that holes appeared to start and grow significantly in the ± 45 layer. Pores will enlarge and agglomerate when the load level and number of cycles increase. This research investigated how CT technology can be used in CFRP fatigue experiments.

中文翻译：

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使用微型 CT 技术研究高载荷下 CFRP/Al 螺栓接头的疲劳性能和损伤演化


尽管工程中经常使用铝合金（Al）和碳纤维增强塑料（CFRP）之间的螺栓连接，但这些连接处疲劳失效的具体原因仍不清楚。本次研究中，在高负载水平下对 CFRP/AL 螺栓单搭接接头 (SLJ) 进行了拉-拉疲劳实验。两种堆叠顺序（[±45] 和 [0/90，±45]）与 0.75 至 0.96 之间的多个负载水平一起开发。利用微型X射线计算机断层扫描（μCT）进行无损检测，重建三维（3D）模型，并对孔隙进行测量和评估，以进一步探索CFRP的疲劳失效机制。结果表明，虽然 CFRP 在较高载荷水平下失效，但 Al 失效却发生在较低载荷水平下。在 0.923 比 0.95 的比率下，还观察到竞争失败。 CT 分析结果显示，孔洞似乎在 ± 45 层中开始出现并显着增大。当负载水平和循环次数增加时，孔隙会扩大并聚集。本研究调查了 CT 技术如何应用​​于 CFRP 疲劳实验。