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Combined effects of seawater ageing and fatigue loading on the bearing performance and failure mechanism of CFRP/CFRP single-lap bolted joints

机译：海水老化和疲劳载荷对CFRP / CFRP单圈螺栓连接轴承性能和破坏机理的综合影响

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摘要

The aim of this paper is to investigate the combined effects of seawater ageing and fatigue loading on the bearing performance and failure mechanism of CFRP/CFRP single-lap bolted joints. The bolted joints with an interference fit size of 1.15% were prepared and then immersed in artificial seawater (50 degrees C-3.5% NaCl solution) for 7 months. After that, fatigue loads were further applied to the unaged and aged joints. Finally, single-lap bearing tests were carried out to evaluate the bearing performance of seawater aged and fatigue load treated joints. Scanning electron microscope (SEM) was used to analyze bearing failure morphology. The experimental results showed that the ultimate bearing load of joints suffered the single effect of seawater ageing decreased exponentially with the increase of ageing time, while the joints suffered the combined effect of seawater ageing and fatigue loading decreased linearly. Moreover, compared with the single effect joints, the bearing capacity of combined effect joints showed a significant improvement. Furthermore, the failure mechanism of single effect joints was mainly the shearing fracture in bearing zones, and such shear angle increased with ageing time. However, the failure mechanism of combined effect joints was changed to be delamination in bearing zones.
机译：本文的目的是研究海水老化和疲劳载荷对CFRP / CFRP单圈螺栓连接接头的承载性能和破坏机理的综合影响。准备过盈配合尺寸为1.15％的螺栓接头，然后将其浸入人工海水（50℃-3.5％NaCl溶液）中7个月。之后，疲劳载荷进一步施加到未老化和老化的接头上。最后，进行单圈轴承测试以评估海水老化和疲劳载荷处理过的接头的轴承性能。扫描电子显微镜（SEM）用于分析轴承失效形态。实验结果表明，受海水老化影响的节点的极限承载力随老化时间的增加而呈指数下降，而受海水老化影响的节点的联合承载力与疲劳载荷呈线性下降关系。而且，与单作用接头相比，组合作用接头的承载能力有了显着提高。此外，单效节理的破坏机理主要是轴承区的剪切断裂，且该剪切角随时效时间的增加而增大。但是，组合效应接头的失效机制已更改为在轴承区域分层。

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