Fatigue performance test on inclined central cracked steel plates repaired with CFRP strand sheets. (September 2018)

• Record Type: Journal Article
• Authors: Chen, Tao; Li, Lingzhen; Zhang, Ningxi; Song, Xiaobin; Hidekuma, Yuya
• Is Part Of: Thin-walled structures. Volume 130(2018)
• Page Start: 414
• Page End: 423
• Publication Date: 2018-09
• Subjects: CFRP strand sheet -- Steel plate -- Inclined crack -- Fatigue crack propagation life -- Oblique compression failure mode; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2018.06.004
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: An experimental study was conducted on central-cracked steel plates with different crack inclination angles that had been repaired with carbon fiber reinforced polymer (CFRP) strand sheets. Initial cracks with five different inclined angles (0–60°) were artificially induced from a central hole of steel plates. All the cracks had the same projection length, running perpendicular to the loading axis. Crack lengths, crack trajectories, failure modes and the effects of different repair configurations were investigated, and fatigue crack propagation lives were compared. A typical adhesive failure mode, oblique compression failure in the adhesive layer, was observed. A conclusion was drawn that fatigue life was directly determined by the projection length, while the projection length was calculated from the initial crack length and inclination angle. The average fatigue life extension ratio of specimens with single-sided repairs was 1.44; that of specimens with double-sided repairs was 3.03. Highlights: CFRP strand sheets were effective to improve fatigue crack propagation life of cracked steel plates. Typical oblique compression failure in adhesive layer was observed. Crack inclination angles had minor effect on fatigue life under uniaxial tension fatigue loading. Fatigue lives tend to be alike when crack projection lengths perpendicular to loading direction are same.