Bending strength of single-lap adhesive joints under hygrothermal aging combined with cyclic thermal shocks

Hirulkar, N. S.; Jaiswal, Priyanka; Reis, P.N.B.; Ferreira, J.A.M.

doi:10.1080/00218464.2019.1681981

Cited by 22 publications

(15 citation statements)

References 52 publications

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“…2 Numerous scientific studies have been conducted with focus on the durability of adhesive joints in the presence of water, salinity, temperature, fire and ultraviolet radiation 10 and their damage mechanisms. 2,[11][12][13] The results demonstrate that the most severe damage occurs at the adhesive/adherend interface. 14 Different environmental exposure can cause a change in the failure mode of the joint.…”

Section: Introductionmentioning

confidence: 84%

“…1 In recent years, the use of metal-to-composite adhesive joints has expanded in maritime industries as well. As the application of adhesive joints possesses many desirable mechanical properties such as high strength to weight ratio, 2 good fatigue resistance properties, 3 high toughness and low-stress concentration 4 etcetera, they received significant attention of shipbuilding industries in the last few decades. 5 However, the integrity and damage mechanisms of adhesive joints are significant issues in naval industries, 4 and depend on specific parameters like service conditions, production of joint, 6,7 thickness of adherend and adhesive 8,9 and environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

“…5 However, the integrity and damage mechanisms of adhesive joints are significant issues in naval industries, 4 and depend on specific parameters like service conditions, production of joint, 6,7 thickness of adherend and adhesive 8,9 and environmental conditions. 2 Numerous scientific studies have been conducted with focus on the durability of adhesive joints in the presence of water, salinity, temperature, fire and ultraviolet radiation 10 and their damage 1 Soete Laboratory, Department of Electromechanical Systems and Metal Engineering (EMSME), Ghent University, Ghent, Belgium 2 Structural Integrity & Composites Group, Faculty of Aerospace Engineering, Delft University of Technology, Delft, The Netherlands 3 Com&Sens, Gent, Belgium mechanisms. 2,[11][12][13] The results demonstrate that the most severe damage occurs at the adhesive/adherend interface.…”

Section: Introductionmentioning

confidence: 99%

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Deformation and damage evolution of a full-scale adhesive joint between a steel bracket and a sandwich panel for naval application

Jaiswal

Kumar

Saeedifar

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The increasing interest for the application of adhesive joints in naval superstructures motivates researchers to gain an in-depth understanding of the mechanical behaviour and failure mechanisms of these joints. This work reports on an experimental study of the deformation behaviour and damage evolution of a full-scale multi-material joint using different instrumentation techniques. Adhesively bonded joints of steel to sandwich panel components have been subjected to quasi-static tensile tests during which the global deformation of the joint and local strain distributions were monitored using digital image correlation (DIC). During one particular tensile test, fibre optic Bragg sensors (FBG) were also applied to the specimen’s surface at different locations in order to quantify the evolution of local strains. Additionally, acoustic emission (AE) sensors were installed in order to monitor damage initiation and evolution with increasing levels of imposed deformation. This test showcased adhesive failure at the interface of the steel adherend and the adhesive, while cohesive failure was observed within the adhesive and skin failure at the interface between adhesive and the composite skin of the sandwich panel. The post-mortem observed failures modes were compared to the acoustic events that originated during the test due to damage initiation and propagation within the joint. The evolution of the different sensor signals, i.e. the damage expressed as cumulative AE energy and local strains measured with Bragg sensors and DIC, are mutually compared and acceptable correlation is found.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deformation and damage evolution of a full-scale adhesive joint between a steel bracket and a sandwich panel for naval application

Jaiswal

Kumar

Saeedifar

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Comparing the above data, it can be found that, in Araldite® 2012 and Araldite® 2014 adhesives, the T g of the pure water environment was lower than that in the 95%RH environment. This was because of the fact that the order of water molecules inside the adhesive was restricted by external water molecules in a pure water environment, which made the system reach a balance [ 30 ]. As time goes by, the system will gradually become more balanced, so its degree of change was smaller than that of a 95%RH environment.…”

Section: Resultsmentioning

confidence: 99%

“…The exposed fiber in Figure 13 showed that the epoxy resin layer in the BFRP sheet was separated from the fiber mesh layer, which was the result of the continuous increase of the bonding force between the adhesive and the resin matrix [ 30 ]. Combined with the results of the DSC curves, it can be seen that, as the aging time increases, the glass transition temperature of the adhesive decreased, the glass transition temperature in the polymer chain decreased, the chain mobility increased, and the degree of crosslinking increased [ 29 , 35 ].…”

Section: Resultsmentioning

confidence: 99%

Comparative Failure Study of Different Bonded Basalt Fiber-Reinforced Polymer (BFRP)-AL Joints in a Humid and Hot Environment

et al. 2021

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Fiber-reinforced polymer (FRP) materials are increasingly used in automotive industrial fields to achieve lightweight. In order to study the influence of high temperature and high humidity on the bonding structure between different materials, this paper selects basalt fiber-reinforced resin composite materials (BFRP) and aluminum alloy (Al), and uses Araldite® 2012 and Araldite® 2014, two adhesives, to make single lap joints (SLJs). The aging test was carried out for 0 (unaged), 10, 20, and 30 days under the environment of 80 °C/95% relative humidity (RH) and 80 °C/pure water. In this work, simple Fickian law was used to simulate the hygroscopic change law of dumbbell specimens of two adhesives and BFRP in a pure water environment. It was discovered that Araldite® 2012 is most affected by moisture, but the time to reach the maximum water absorption in Araldite® 2014 was shorter than in Araldite® 2012. The failure strength of the joint was obtained through a quasi-static tensile experiment, and it was found that the Araldite® 2014 adhesive joint first increased and then decreased in a high temperature environment. The strength increased by 11.63% after 20 days of aging under an 80 °C/95%RH environment, and increased by 16.66% after 10 days of aging under an 80 °C/pure water environment, which indicates that post-curing reaction occurred. The strength of Araldite® 2012 joints showed a downward trend. After 30 days of aging, it reduced by 40.38% under an 80 °C/95%RH environment and 41.11% under an 80 °C/pure water environment. By observing the load-displacement curve, it was found that, as time increased, the slope of the curve decreased, indicating that the stiffness of the bonded joint decreased with time. The failure modes of the joints were analyzed by macroscopic images and microscopic SEM methods, and the results showed that the surface failure transitions from a mixed failure to a complete tear failure over time. The failure of the basalt fiber/resin interface was because the interaction between the epoxy resin in the adhesive and the epoxy resin in BFRP was greater than the force between the basalt fiber layer and the epoxy resin layer in the BFRP sheet.

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Effect of long‐term stress aging on aluminum‐BFRP hybrid adhesive joint's mechanical performance: Static and dynamic loading scenarios

et al. 2022

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Composite-aluminum hybrid adhesive joints represent an ideal solution for designing lightweight structures for the marine industry. However, seawater aging is a serious concern, limiting the safe service life of the joint. Notably, efforts to understand the impact of aging have largely focused on the shortterm periods without considering actual operating conditions. Here, we report the mechanical performance of hybrid joints subjected to the long-term stress aging. Besides, we modified the epoxy adhesive with halloysite nanotubes (HNTs) to limit the aging driven adhesive degradation and improve the adhesive's rigidity. We evaluated mechanical performances of hybrid joints by performing tensile, flexural, and drop-weight impact tests. While we increased the

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Bending strength of single-lap adhesive joints under hygrothermal aging combined with cyclic thermal shocks

Cited by 22 publications

References 52 publications

Deformation and damage evolution of a full-scale adhesive joint between a steel bracket and a sandwich panel for naval application

Deformation and damage evolution of a full-scale adhesive joint between a steel bracket and a sandwich panel for naval application

Comparative Failure Study of Different Bonded Basalt Fiber-Reinforced Polymer (BFRP)-AL Joints in a Humid and Hot Environment

Effect of long‐term stress aging on aluminum‐BFRP hybrid adhesive joint's mechanical performance: Static and dynamic loading scenarios

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