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Stress and Failure Analyses of Functionally Graded Adhesively Bonded Joints of Laminated FRP Composite Plates and Tubes: A Critical Review

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This paper presents a critical review of stress and failure analyses of functionally graded adhesively bonded in-plane and out-of-plane joints of laminated Fiber Reinforced Polymeric (FRP) composite plates and tubes. Different joint configurations viz. single lap joint, double lap joint, lap shear joint, single supported tee joint, double supported tee joint, tubular lap joint, and tubular socket joint are considered in this review article. These joints exhibit a common problem, called edge effects, arising from peel and shear stress concentrations occurring around the free edges of plate/tubeadhesive interfaces and affecting the overall joint strength considerably. Some geometry-specific measures were reviewed for adjusting stiffness of joint members around these free edges in order to enhance joint strength.

The present review also discusses the different modes of failures such as cohesive failure, interfacial failure, interlaminar/intralaminar delamination, debonding of fiber-matrix interface, matrix cracking, and fiber breakage, in adhesively bonded laminated FRP composites. The present article has made significant effort to explore the important and potential characteristics of functionally graded adhesive materials used for adhesively bonded joints in order to enhance the structural integrity of the joint. This has been achieved by smoothing/relieving stress distributions over the entire bondline by introducing the concept of Functionally Graded Adhesive (FGA) in lieu of conventional monolithic adhesive material. The different research works showing the effectiveness of functionally graded adherends, bi-adhesives and functionally graded adhesives on the performance of adhesively bonded joint structures are discussed in detail. Based on the exhaustive review, a bonded joint with functionally graded adhesive is recommended for the joint design due to its improved damage growth resistance.
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Document Type: Review Article

Publication date: 01 June 2017

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