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

The effect of adherent thickness on the fatigue performance, fatigue limit, and failure mode of adhesively bonded thin aluminum single lap joint (SLJ) was experimentally and numerically investigated. High‐cycle fatigue tests were performed, and fatigue life was estimated using various fatigue criter...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2019-02, Vol.42 (2), p.561-571
Main Authors: Shahani, Amir Reza, Pourhosseini, Seyed Majid
Format: Article
Language:English
Subjects:
adherent thickness
Adhesive bonding
Adhesive joints
Aluminum
Bonded joints
Case studies
Crack propagation
Criteria
Empirical analysis
Failure modes
Fatigue failure
Fatigue life
Fatigue limit
Fatigue strength
Fatigue tests
Finite element method
Lap joints
Mathematical models
Plastic deformation
Thickness
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Summary:The effect of adherent thickness on the fatigue performance, fatigue limit, and failure mode of adhesively bonded thin aluminum single lap joint (SLJ) was experimentally and numerically investigated. High‐cycle fatigue tests were performed, and fatigue life was estimated using various fatigue criteria and finite element modeling. Based on the experimental results, increase in adherent thickness leads to increase in fatigue limit. In addition, failure location changes from adhesive to adherent by increasing the adherent thickness. It seems that in adherent failure, selecting a sheet with higher fatigue strength is required to achieve higher fatigue life. Also, based on the analysis of different fatigue criteria, Smith‐Watson‐Topper criterion could predict the joint fatigue life more accurately by considering the mean stress effect and the plastic strain. Finally, as an important result, an unsymmetrical SLJ specimen was evaluated as an industrial case study, and the empirical estimated life was consistent with the experimental results.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12931