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Erschienen in:
2015 | OriginalPaper | Buchkapitel
24. Fatigue Behavior of Glass-Bubbles Modified Adhesively Bonded Composite Joints
verfasst von : Ermias G. Koricho, Anton Khomenko, Mahmoodul Haq
Erschienen in: Fracture, Fatigue, Failure, and Damage Evolution, Volume 5
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Abstract
Adhesive joining is gaining acceptance in aerospace, automotive, and marine industries as it allows joining of similar and dissimilar materials, eliminates secondary machining processes, minimizes stress due to mechanical joining and most importantly reduces structural weight. One way of improving the performance of adhesively bonded joints is the use of nano-/micro- particle reinforcement of the adhesive or composite matrix. While considerable literature exists on nano-modified composite substrates to improve their mechanical and thermal properties, the work on nano-/micro- modified adhesively bonded joints and their fatigue behaviour is relatively limited.
Therefore, in this paper, the fatigue behaviour of single lap-joints (SLJs) made of S-glass/epoxy substrates were studied. Adhesives with and without glass-bubbles (microspheres) modification were evaluated. The specimens were subjected to different fatigue (tension–tension) loadings with the maximum loading level of 90 % of the bond shear strength. As expected, the fatigue life of adhesive joints in both cases, pristine and glass bubble modified adhesives, depend on the applied cyclic loadings. Inclusion of glass bubbles improves the tensile strength and the fatigue life of single-lap joints. The observations from the experimental fatigue data and its correlation with failure could be considered as valuable information for better design of composite joints and related components.