The effect of adherent thickness on fatigue life of adhesively bonded joints

Shahani, A.R.; Pourhosseini, Seyed Majid

doi:10.1111/ffe.12931

Cited by 17 publications

(10 citation statements)

References 29 publications

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“…It shows that the unbonded area within the adhesive layer has a similar effect as overlap length. Increasing the unbonded area decreases the crack growth life due to the shorter crack growth length, which explains why fatigue failure life of weld‐bonded joints is smaller than that of similar adhesive‐bonded joints 16 . However, the initiation life remains similar in three kinds of joints, indicating the insignificant effect of unbonded area on crack nucleation.…”

Section: Resultsmentioning

confidence: 99%

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Experimental and numerical evaluations on the effects of adhesive fillet, overlap length and unbonded area in adhesive‐bonded joints

Lai

et al. 2020

Fatigue Fract Eng Mat Struct

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To realize robust structural design, the effects of the adhesive fillet, overlap length and unbonded area in adhesive‐bonded joints need to be fully understood and incorporated into a fatigue life estimation method. In the present work, both static and fatigue experiments are performed on six types of adhesive‐bonded joints to illuminate these effects systematically. A straightforward total fatigue life evaluation method is proposed to address these effects. A statistical crack initiation model is established based on the fatigue data of bulk adhesive specimens. Growth life is calculated using the interfacial crack model and mixed mode crack growth method. Good correlation is observed between the calculated and experimental fatigue lives. Furthermore, the effects of the adhesive fillet, overlap length and unbonded area are analysed based on both calculated and experimental results. Results indicate that adhesive fillet postpones crack initiation by reducing local strain level, both overlap length and unbonded area change the growth life by length. Besides, overlap length promotes the fraction of mode II strain energy release rate in total, reducing crack growth rates and extending growth life.

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Section: Resultsmentioning

confidence: 99%

“…Generally, the total fatigue failure of an adhesive‐bonded joint consists of crack initiation 16,17 and subsequent crack growth 18–21 . It has been reported that the proportion of crack growth life will increase with increasing load levels 22–24 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical evaluations on the effects of adhesive fillet, overlap length and unbonded area in adhesive‐bonded joints

Lai

et al. 2020

Fatigue Fract Eng Mat Struct

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“…Afendi et al 33 reported that the apparent tensile modulus of adhesive layer of the SAJs is about 1.5–5 times higher than that of the bulk epoxy, and the strength of the joints was increased with decreasing bond thickness. Shahani and Pourhosseini 17 pointed out that the increase in the adhesive thickness results in increasing stress concentration and hence, decreasing fatigue lives and strength. Numerically, Davies et al 34 found that the stress state exhibited larger stress concentration factors for tensile loading in the adhesive joints with thicker bondline, which can interpret their lower strength.…”

Section: Resultsmentioning

confidence: 99%

Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

Khashaba

2022

Journal of Composite Materials

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In this study, fatigue results of the scarf adhesive joints (SAJs) were extensively analyzed regarding the effect of the adhesive materials (neat epoxy (NE), and SiC and Al2O3-nanocomposite), bond thickness (0.17 mm and 0.25 mm) on their dynamic properties, which include loss factor (tan δ), loss modulus ( E''), dissipated energy ( U d), potential energy ( U p), and storage modulus ( E'). Safe fatigue lives of the NE, SiC, and Al2O3-SAJs were estimated at different reliability levels. The experimental measurements revelated that reducing the adhesive layer thickness from 0.25 mm to 0.17 mm result in enhancing the tensile strength and stiffness of the SiC-SAJs by 9.6% and 4.4%, respectively, in return of 9.5% and 5.4% for the Al2O3-SAJ relative to the NE-SAJ. The strength and stiffness of the SiC-SAJs with 0.17 mm bond thickness are higher than those of the Al2O3-SAJ by 15.4% and 3.3%, respectively. The highest improvement of 22.0% in the fatigue strength was occurred for the SiC-SAJ with bond thickness of 0.17 mm in return of 4.8% for the Al2O3-SAJ. The U p was used for the first time (except author works) for monitoring and predicting the damage in the adhesive joints practically the change in the enclosed area of the hysteresis loop is too small to cause a large variation in the tan δ, E'', and U d. Damping factor of the NE-SAJs is marginally increased with the stress levels compared to the aggravated increase of both SiC and Al2O3-SAJs. Zhang model predicts well the potential energy and storage modulus specially at higher stress levels.

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“…The adhesive layer thickness has a detrimental influence on the mechanical characteristics of the bonded joints 18 . Ferro and Berto 19 have investigated the influence of adhesive material thickness on the failure stress and average strain energy density of butt joint with diameter of 15 mm.…”

Section: Introductionmentioning

confidence: 99%

“…The adhesive layer thickness has a detrimental influence on the mechanical characteristics of the bonded joints. 18 Ferro and Berto 19 have investigated the influence of adhesive material thickness on the failure stress and average strain energy density of butt joint with diameter of 15 mm. They have found that the critical value of the average strain energy density is independent on the adhesive layer thickness and hence, can be used for bonded joint design.…”

Section: Introductionmentioning

confidence: 99%

A new approach for fatigue damage detection in adhesive joints modified with nanoparticles under different temperatures

Khashaba

Najjar

2022

Fatigue Fract Eng Mat Struct

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Scarf adhesive joints (SAJs) in carbon fiber composites were fabricated with 5° taper angle and bondline thickness of 0.17 mm. The joints are modified with SiC‐nanoparticles and characterized through tensile and fatigue loading at room temperature (RT) and 50°C. The analysis of the hysteresis loop in terms of loss and storage moduli, potential and dissipated energies, and damping factor is a quite new topic and one of the important goals of this study. At RT, the fatigue limit of the SAJs was improved by 55% when the bondline thickness decreased from 0.25 to 0.17 mm and further enhanced by 22% with SiC incorporation. For the first time, the evolution of the potential energy versus fatigue cycles of the SAJs can be modeled for early predicting joint life and hence helps in preventing their sudden failure. At 50°C, the fatigue strength of the SiC‐SAJ is approximately equal to the unmodified joint at RT.

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The effect of adherent thickness on fatigue life of adhesively bonded joints

Cited by 17 publications

References 29 publications

Experimental and numerical evaluations on the effects of adhesive fillet, overlap length and unbonded area in adhesive‐bonded joints

Experimental and numerical evaluations on the effects of adhesive fillet, overlap length and unbonded area in adhesive‐bonded joints

Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

A new approach for fatigue damage detection in adhesive joints modified with nanoparticles under different temperatures

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