802 The damage behavior of adhesively bonded scarf joints bonded by a rubber-modified epoxy adhesive under cyclic loading

An estimation method of fatigue strength of adhesively bonded joints with various stress triaxialities in the adhesive layer has been proposed based on a damage evolution model for high cycle fatigue. To realize various triaxial stress states, fatigue test was conducted for adhesively bonded butt and scarf joints with various scarf angles bonded by a rubber-modified epoxy adhesive. An equation for estimating the damage evolution in the adhesive layer of the butt and scarf joints was derived from the damage model, where undefined parameters in the equation were determined by comparing the experimentally obtained damage evolution curves of the butt joints with the estimated damage evolution curves. Furthermore, an equation for the estimation of fatigue strength was derived under the assumption that fatigue failure occurs when the damage variable reaches to a critical value. When compared the experimental S-N data of scarf joints with the estimated ones, the estimated fatigue strengths agree well with the experimental data with various scarf angles. This finding suggests that the CDM model is applicable for estimating fatigue strength of adhesively bonded joints with different stress triaxialities.

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Fatigue damage evaluation of adhesively bonded butt joints with a rubber-modified epoxy adhesive

Journal of Adhesion Science and Technology ◽

10.1163/156856103322112888 ◽

2003 ◽

Vol 17 (7) ◽

pp. 981-994 ◽

Cited By ~ 18

Author(s):

Makoto Imanaka ◽

Tatuyuki Hamano ◽

Akira Morimoto ◽

Ryuichi Ashino ◽

Masaki Kimoto

Keyword(s):

Fatigue Damage ◽

Epoxy Adhesive ◽

Damage Evaluation ◽

Adhesively Bonded ◽

Butt Joints ◽

Modified Epoxy

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Fatigue behavior of adhesively bonded glass fiber reinforced plastic composites with different overlap lengths

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406214559111 ◽

2015 ◽

Vol 229 (7) ◽

pp. 1292-1299

Author(s):

E Kara ◽

A Kurşun ◽

MR Haboğlu ◽

HM Enginsoy ◽

H Aykul

Keyword(s):

Glass Fiber ◽

Fatigue Behavior ◽

Laminated Composite ◽

Element Model ◽

Treatment Method ◽

Epoxy Adhesive ◽

Lap Joints ◽

Adhesively Bonded ◽

Glass Fiber Reinforced Plastic ◽

Glass Fiber Reinforced

The joining techniques of lightweight and strong materials in the transport industry (e.g. automotive, aerospace, shipbuilding industries) are very important for the safety of the entire structure. In these industries, when compared with other joining methods, the use of adhesively bonded joints presents unique properties such as greater strength, design flexibility, and reduction in fuel consumption, all thanks to low weight. The aim of this study was the analysis of the tensile fatigue behavior of adhesively bonded glass fiber/epoxy laminated composite single-lap joints with three different specimen types including 30, 40 and 50 mm overlap lengths. In this study, composite adherents were manufactured via vacuum-assisted resin transfer molding and were bonded using Loctite 9461 A&B toughened epoxy adhesive. The effect of a surface treatment method on the bonding strength was considered and it led to an increment of about 40%. A numerical analysis based on a finite element model was performed to predict fatigue life curve, and the predicted results showed good agreement with the experimental investigation.

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