The influence of cyclic ageing on the fatigue performance of bonded joints

Costa, J. A. da; Akhavan‐Safar, A.; Marques, E.A.S.; Carbas, R.J.C.; Silva, L.F.M. da

doi:10.1016/j.ijfatigue.2022.106939

Cited by 13 publications

(3 citation statements)

References 26 publications

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“…Nevertheless, different diffusion coefficients should be defined for each cycle, while also the boundary conditions depend on the ageing cycle [197]. Very recently, the static strength [197], fracture energy [200], and fatigue life [201] of bonded joints have been investigated under cyclic ageing conditions. It was shown that using a single-cycle ageing result may overestimate the strength and lifetime of bonded joints exposed to cyclic moisture.…”

Section: Water Uptakementioning

confidence: 99%

“…The effect of loading conditions was also investigated by Chen et al [243] by including a mixed-mode parameter in the Paris-law relation. Not only the variety in loading and environmental conditions [201,227], but also the difference in joint geometry-especially the adhesive thickness-can change the fatigue crack growth rate [244,245].…”

Section: Fatigue Crack Growth Modelsmentioning

confidence: 99%

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From fundamental concepts to recent developments in the adhesive bonding technology: a general view

Borges

Akhavan‐Safar

Tsokanas

et al. 2023

Discov Mechanical Engineering

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Adhesive bonding is a constantly developing technique, and the volume of its industrial applications is rapidly increasing, which, in turn, requires improving the compatibility and performance of joining methods in specific applications. The industrial growth of adhesive bonding has also been linked to the broader implementation of composite materials and the increasing number of applications requiring joining dissimilar materials. Compared to traditional joining methods, adhesive bonding does not require local heating of the substrates or introducing holes or notches to them. It is instead a continuous joining method that promotes fewer regions of discontinuities and uniformity of the stress fields. Due to the industrial interest in this method, a substantial effort has been made to expand its range of applications and to provide the design tools that ensure it is a safe, reproducible, reliable, and durable process. The adhesive bonding research field is broad, ranging from adhesive formulation to evaluation of the final bonded structure. The present paper collects the relevant literature and discusses fundamental concepts and recent developments in the adhesive bonding technology, covering three essential topics: adhesive materials, joint designs and joint manufacturing methods, and joint modelling methods. Citing a wealth of relevant review papers, original papers, and book chapters, the paper intends to provide a coherent view of the state of the art, so the reader can identify the opportunities originating from the recent progresses in adhesive bonding.

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Section: Water Uptakementioning

confidence: 99%

Section: Fatigue Crack Growth Modelsmentioning

confidence: 99%

From fundamental concepts to recent developments in the adhesive bonding technology: a general view

Borges

Akhavan‐Safar

Tsokanas

et al. 2023

Discov Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…Adhesive joints used in these applications typically experience severe loading, such as cyclic and impact loading, 3,4 and are exposed to harsh environments such as high temperature and humidity 5 . The combination of temperature, moisture, and fatigue not only accelerates the fracture of adhesively bonded joints but also makes it difficult to predict 6 . Additionally, the life of the adhesive joint in a harsh environment is extremely short because adhesives are composed of polymers that are prone to degradation.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement of moisture distribution in the adhesive layer using near‐infrared spectroscopy

Han

Sekiguchi

Shimamoto

et al. 2023

J of Applied Polymer Sci

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Adhesive joints are degraded when exposed to moist conditions, making it essential to assess the permeation distance of absorbed moisture. However, monitoring the water penetration in the adhesive layer is challenging because the adhesive layer is sandwiched between the adherends. To overcome this difficulty, we proposed a new monitoring system using fiber-type near-infrared spectroscopy (NIRS), and the moisture distribution at the joint was successfully observed by introducing quartz glass as one side of the substrate. First, the change in the absorbance spectra owing to water absorption by an epoxy adhesive was investigated by immersing epoxy-coated aluminum alloy plates in temperature-controlled water. It was found that the water content can be evaluated by monitoring the change in the peak intensity appearing around 1900-1950 nm. Next, water penetration into the adhesive layer sandwiched between the quartz glass and aluminum alloy was investigated by scanning the surface. The water permeation distance was found to change with temperature. Under the 23 C immersion condition, approximately 2.5 mm of water penetration was observed after 8 weeks. Because the simulation results using Fick's law of diffusion showed similar trends, it was experimentally confirmed that Fickian diffusion dominates the water distribution in the adhesive layer.

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Long‐term performance of single‐lap joints: Review, challenges and prospects in civil engineering

Shu,

Qiang,

Jiang

et al. 2023

Engineering Reports

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Compared with traditional technology, bonding technology is more suitable for civil structure reinforcement because of its cost‐efficiency and superior mechanical properties. However, research on the long‐term performance of single‐lap joints (SLJs) requires better organization and comprehension. This article aims to investigate the long‐term performance and optimization design of SLJs. The main factors influencing the long‐term performance of SLJs from both material and component levels are discussed. The moisture diffusion mechanisms of bulk adhesives and the degradation mechanisms of SLJs are explored. Moreover, the optimization design of SLJs focuses on evaluating the overlap length, adhesive layer thicknesses, and changes in adhesives along the overlap length based on available literature. It is found that the applicability of diffusion models should be validated, and the selection of the models should consider working environments and types of adhesives. Exploring failure mechanisms and design criteria for the mixed SLJs in hygrothermal environments with/without sustained or alternating load is significant for the optimization design. This article indicates the limitations on the shear strength and long‐term performance of SLJs in available studies and provides insights into the challenges and prospects of their optimization design.

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The influence of cyclic ageing on the fatigue performance of bonded joints

Cited by 13 publications

References 26 publications

From fundamental concepts to recent developments in the adhesive bonding technology: a general view

From fundamental concepts to recent developments in the adhesive bonding technology: a general view

Experimental measurement of moisture distribution in the adhesive layer using near‐infrared spectroscopy

Long‐term performance of single‐lap joints: Review, challenges and prospects in civil engineering

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