Influence of salt fog and ambient condition exposure on CFRP-to-steel bonded joints. (15th January 2022)

• Record Type: Journal Article
• Authors: Yang, Yongming; Zhao, Jun; Zhang, Shishun; Yang, Zhaohui; Biscaia, Hugo
• Is Part Of: Composite structures. Volume 280(2022)
• Publication Date: 2022-01-15
• Subjects: CFRP -- Steel structures -- Adhesively bonded joints -- Mechanical anchorage -- Salt fog exposure; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2021.114874
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: In this paper, the influence of salt fog and ambient condition exposure on CFRP-to-steel bonded joints (CSJs) with a near end mechanical anchorage was studied. The tests of the CSJs were carried out with a monotonic loading history respectively with and without a near end mechanical anchorage both unaged and after being exposed to the ageing conditions. The results revealed failures in the adhesive for some CSJs with a near end mechanical anchorage, among which also exhibited the best bond performance both in aged and unaged specimens. Due to the high state of degradation after ageing exposure, local damage of the CFRP located at the gap position of the CSJs was induced by a torsion action during the fixation of the specimen in the tensile machine even prior to the testing, which caused, although locally, severe delamination of the CFRP of the aged CSJs. From the torsion test results, a decrease in the torsional capacity of the CFRP after aging revealed the degradation of the carbon fiber-to-matrix interface. Additional results reflected that a drop in the initial stiffness of the load vs . slip relationship can be observed, caused by a pre-crack with a length of 30 mm in the CSJs.