Evaluation of insert design on the performance of repaired composite-Ti alloy joints. (15th December 2019)

• Record Type: Journal Article
• Authors: Zhu, Yun-tao; Akkerman, Remko; Xiong, Jun-jiang; Luo, Chu-yang; Du, Yi-sen
• Is Part Of: Composite structures. Volume 230(2019)
• Publication Date: 2019-12-15
• Subjects: CFRP-titanium alloy screwed joints -- Repair effect -- Metal inserts -- Joint stiffness; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2019.111506
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: Two kinds of titanium alloy inserts, namely bushing and embedded conical nut, were designed to repair the bearing damaged zone of screwed single-lap carbon fiber/polyimide composite-TC4 alloy joints, respectively. Quasi-static tensile tests were conducted to determine the effects of such repairs in terms of joint strength and joint stiffness concepts. Based on a simplified bearing model, the deformation mechanisms of titanium inserts influencing the joint performance are further discussed. It is concluded that: 1) the load-displacement curves of screwed joints consist of five characteristic stages; 2) the screw tilt significantly increases the failure load of the screw; 3) the use of an embedded conical nut aggravates the screw tilt, while the use of a bushing reduces the effect of screw tilt by distributing the bearing deformation evenly through the thickness. This difference leads to a different repair effect in terms of joint stiffness.