Abstract Fatigue behaviors of hybrid joint, the combination of cold-formed mechanical fastening with adhesive bonding, are yet to be understood comprehensively even though they have been widely used in industries. The lack of understanding is mainly attributed to the complicated load transfer path and possible interactions between the two types of joining techniques, namely mechanical interlocking and adhesive bonding. In the present work, fatigue tests are performed on self-piercing riveted (SPR) joint, adhesive-bonded joint, and the SPR-bonded joint under lap shear and 45° loading conditions. Failure mechanisms are evaluated based on terminated fatigue test and numerical analysis. Periodical and asymmetric failure mode can be identified in SPR-bonded joint. Although both crack pinning and asymmetric failure mode induced by SPR suppress the crack growth in adhesive bonding, the effect of crack pinning is significant only when crack approaches SPR. The asymmetric failure also leads to load transfer path evolution, intensifying damage on SPR joining. A mechanism-based fatigue life evaluation method is proposed by characterizing the interactions with crack growth method and structural stress method. The calculated results are compared with the experimental ones, and good correlations are observed for both lap shear and 45° loading conditions.
ABSTRACTIn this paper, the cohesive zone modeling (CZM) method has been employed to simulate static and fatigue debonding growth in adhesively bonded composite joints containing bolts as crack stop...
#1Farid Gamdani(École Polytechnique de Montréal)H-Index: 2
#2Rachid Boukhili(École Polytechnique de Montréal)H-Index: 17
Last. Aurelian Vadean(École Polytechnique de Montréal)H-Index: 9
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Abstract In composite structures, the strength of a standard single-lap joint with multiple bolts at best matches the strength predicted by the standard open-hole tension (OHT) test, which is about 50% of the tensile strength of the unnotched material. Although bonded joints do not have such limitation, they carry other drawbacks. The advantages of bolting and bonding may be combined in hybrid/bonded-bolted (HBB) joints. This study investigates HBB joints using carbon and glass-fiber reinforced ...
Last. Rinze Benedictus(TU Delft: Delft University of Technology)H-Index: 34
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Abstract The fracture behaviour of joints bonded with a structural epoxy adhesive and bond line thicknesses of 0.1–4.5 mm has been studied. However, limited research is found on similar joints with thicker bond lines, which are relevant for maritime applications. Therefore, the effect of the adhesive bond line thickness, varying from 0.4 to 10.1 mm, on the mode I fracture behaviour of steel to steel joints bonded with a structural epoxy adhesive was investigated in this study. An experimental te...
#1J.P.A. Valente(ISEP: Instituto Superior de Engenharia do Porto)H-Index: 1
#2Rdsg Campilho(ISEP: Instituto Superior de Engenharia do Porto)H-Index: 11
Last. L.F.M. da Silva(Faculdade de Engenharia da Universidade do Porto)H-Index: 24
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Abstract The use of bonded joints in industrial applications has been increasing in recent years, to the detriment of traditional bonding methods such as welding, brazing, and bolted and riveted joints. In many practical situations, such as vehicle crashes, adhesive joints are subjected to impact loads. However, the knowledge on the joint behaviour for this loading is much less addressed in the literature that the typically studied static case. This work focuses on a numerical study, through coh...
ABSTRACTHybrid joints consist of mechanical connections in which both a traditional mechanical joint (i.e. riveting, clinching, welding) and adhesive bonding coexist in order to obtain a better performance if compared with simple bonded or mechanically connected joints. Several literature works demonstrates how hybrid joining allows to improve strength, stiffness and energy absorption in comparison with simple mechanical or bonded connections. In this work the static strength and, more in deep, ...
#1Xiao Zhijie(Kunming University of Science and Technology)H-Index: 1
#2Kai Zeng(Kunming University of Science and Technology)H-Index: 2
Last. Zhang Long(Kunming University of Science and Technology)H-Index: 2
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ABSTRACTQuasi-static tests of spot welded and weld-bonded joints with 1.5 mm-thick SUS304 stainless steel sheets were conducted. Joint weld diameters were measured using scanning acoustic microscopy. Fatigue tests were performed to obtain the fatigue lives of two joint types subjected to different stress levels. The equations of load-life curves were obtained by nonlinear regression using a three parameter power function. Scanning electron microscopy was used to explore fatigue failure mechanism...
A modern car body structure is driven by the multi-material design approach. The best material at the correct place is the objective. Consequently, components made of dissimilar materials need to be joined and the applied joining technology becomes a key issue for crashworthiness and structural reliability. In the present work, connections between steel and aluminium using adhesive bonding combined with self-piercing riveting and their structural design are investigated. The safe application of ...
Abstract Due to the continuously reduced emission targets from legislation, lightweight constructions are getting more and more important for car manufactures. One way to reduce weight is the use of multi-material design for the body in white where new joining technologies, such as self-piercing rivets (SPRs) need to be considered instead of spot welding. Since both spot welds and SPRs are local circular joints, it appears reasonable to adapt and modify existing methods for spot welds to estimat...
Last. Yongbing Li(SJTU: Shanghai Jiao Tong University)H-Index: 18
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Abstract null null The combination of adhesive and other joining processes has been an increasing interest in the transportation industry. In this paper, a hybrid joining process combining friction self-piercing riveting (F-SPR) and adhesive bonding was developed to join AA7075-T6 aluminum alloy sheets. The formation process, macro morphology, microstructure, microhardness, and mechanical performance of F-SPR bonded joints were investigated comparing with the F-SPR joints. It was concluded that ...
Abstract riveted–adhesive hybrid joining technique is suitable for joining dissimilar material due to excellent performance and tightness of the joint. In this paper, electromagnetic self-piecing riveted–adhesive hybrid joining method was proposed to join Al/steel structure. The mechanical properties and failure behavior of electromagnetic self-piecing riveting, adhesive and its hybrid joints were compared. The shear tests were conducted, and digital image correlation (DIC) technique was employe...