Two‐parameter analysis of fatigue crack growth behavior in structural acrylic adhesive joints

Sekiguchi, Yu; Houjou, Keiji; Shimamoto, Kazumasa; Sato, Chiaki

doi:10.1111/ffe.13908

Cited by 8 publications

(2 citation statements)

References 77 publications

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“…Similar to Paris’ law of fatigue crack growth (FCG) behavior, a power law relationship:

is obtained for the CCG behavior when the adhesive is assumed to be a viscoelastic material, where

and

are constants, and

is time [ 42 ]. In fatigue testing, data smoothing of the FCG rate is required because of data scattering, and the incremental polynomial method and power-law fitting approach are commonly used [ 49 ]. The same is true for the CCG rate.…”

Section: Resultsmentioning

confidence: 99%

Creep Crack Growth Behavior during Hot Water Immersion of an Epoxy Adhesive Using a Spring-Loaded Double Cantilever Beam Test Method

et al. 2023

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Double cantilever beam (DCB) tests were conducted by immersing the specimens in temperature-controlled water while applying a creep load using a spring. By introducing a data reduction scheme to the spring-loaded DCB test method, it was confirmed that only a single parameter measurement was sufficient to calculate the energy release rate (ERR). Aluminum alloy substrates bonded with an epoxy adhesive were used, and DCB tests were performed by changing the initial load values, spring constants, and immersion temperatures for two types of surface treatment. The initial applied load and spring constant had no effect on the ERR threshold. In contrast, the threshold decreased with the increasing immersion temperature, but even in the worst case, it was 15% of the critical ERR in the static tests. Using the creep crack growth relationship, it was revealed that there were three phases of creep immersion crack growth in the adhesive joints, and each phase was affected by the temperature. The spring-loaded DCB test method has great potential for investigating the combined effects of creep, moisture, and temperature, and this study has demonstrated the validity of the test method. The long-term durability of adhesive joints becomes increasingly important, and this test method is expected to become widespread.

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“…Similar to Paris’ law of fatigue crack growth (FCG) behavior, a power law relationship:

is obtained for the CCG behavior when the adhesive is assumed to be a viscoelastic material, where

and

are constants, and

Section: Resultsmentioning

confidence: 99%

Creep Crack Growth Behavior during Hot Water Immersion of an Epoxy Adhesive Using a Spring-Loaded Double Cantilever Beam Test Method

et al. 2023

Self Cite

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“…It should be noted that using a film made of aluminum foil or PTFE is a usual method to form a pre-crack within the literature. 29,40,53 In order to apply the loading, L-shape hinges were bonded to the specimen using a cyanoacrylate adhesive (Turk fix, Istanbul, Turkey), and the other part of the hinge was bolted to a steel plate that was placed in the grippers of the testing machine. Moreover, ENF tests were conducted based on ASTM D7905 with 0.5 mm crosshead speed.…”

Section: Methodsmentioning

confidence: 99%

Mode-I and II fracture behavior of metal-to-composite bonded interfaces with a graphene nanoplatelet-reinforced structural epoxy adhesive

Javanmard Sistani,

Shariati,

Zamani

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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Epoxy adhesive joints are increasingly being used to bond structural components in automotive, marine, and aircraft bodies. However, poor fracture toughness energy and low resistance to crack growth in structural epoxy adhesives are important drawbacks of these adhesives. To overcome this challenge, this paper aims to investigate the influence of dispersing graphene nanoplatelets (GNPs) into Axson-Sika Adekit A 140-1 structural epoxy adhesive on the fracture behavior of aluminum-to-glass fiber-reinforced polymer composite joints under mode-I and mode-II fracture tests. Double cantilever beam (DCB) and end-notched flexure specimens were fabricated to perform mode-I and mode-II fracture tests. For each specimen, three specimen groups including neat and graphene nanoplatelet reinforced with 0.05 wt.%, 0.1 wt.%, and 0.2 wt.% were considered. Results revealed that, for both of mode-I and mode-II tests, the optimum fracture toughness energy was obtained by inserting 0.1 wt.% of nanoparticles. By addition of 0.05 wt.% and 0.1 wt.% of GNPs, mode-I fracture toughness energy was improved by 90% and 115% compared with neat DCB specimens, while mode-II energy release rate increased by 55% and 83%, respectively. Finally, debonded surfaces were examined using optical microscope and scanning electron microscopy in order to find failure patterns and microstructural reinforcing mechanisms.

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Failure of adhesive bonding unveiled by in-situ strain testing by high-resolution scanning transmission electron microscopy

Horiuchi,

Saito,

Hanada

et al. 2024

Discov Mechanical Engineering

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The nano-scale failure behaviors of adhesive interfaces were investigated through in-situ straining testing to observe real-time crack propagations under a scanning transmission electron microscope (STEM). Two different loading modes were applied to thin sections of adhesive interfaces: crack-opening mode applied to pre-cracks made at the interface and shear mode. The failure of aluminum alloy (Al6061) and a second-generation acrylic adhesive (SGA) was examined, enabling observation of the growth of crazing in the adhesive layer, which has a phase-separated structure, preceding the macroscopic failure of the interfaces. Furthermore, the failure of a direct joint of thermoplastic and Al was investigated, with a comparison made to that observed in the adhesive interface. The generation and propagation of cracks near the interface, attributed to the adhesive's phase separation, contribute to the toughness of the adhesive interface. Both the direction of stress acting on the interface and the interface's strength influence the initiation and growth of cracks throughout the adhesive layer.

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Two‐parameter analysis of fatigue crack growth behavior in structural acrylic adhesive joints

Cited by 8 publications

References 77 publications

Creep Crack Growth Behavior during Hot Water Immersion of an Epoxy Adhesive Using a Spring-Loaded Double Cantilever Beam Test Method

Creep Crack Growth Behavior during Hot Water Immersion of an Epoxy Adhesive Using a Spring-Loaded Double Cantilever Beam Test Method

Mode-I and II fracture behavior of metal-to-composite bonded interfaces with a graphene nanoplatelet-reinforced structural epoxy adhesive

Failure of adhesive bonding unveiled by in-situ strain testing by high-resolution scanning transmission electron microscopy

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