Utilization of nanoindentation to examine bond line integrity in adhesively bonded composite structures

Yavas, Denizhan; Shang, Xu; Hong, Wei; Bastawros, Ashraf F.

doi:10.1007/s10704-016-0165-z

Cited by 11 publications

(2 citation statements)

References 26 publications

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“…considering the cohesive behavior of the crack tip, the existence of nanovoids close to GBs might reduce the GB cohesive strength, thereby shielding vacancy-enhanced plastic deformation within the grain boundary and leading to cleavage GB fracture [52][53].…”

Section: Vacancy Diffusion Calculationmentioning

confidence: 99%

Mechanical degradation due to vacancies produced by grain boundary corrosion of steel

et al. 2020

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Section: Vacancy Diffusion Calculationmentioning

confidence: 99%

Mechanical degradation due to vacancies produced by grain boundary corrosion of steel

et al. 2020

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“…Although the literature reports the effects of damage in adhesive joints such as changes in fatigue performance [52,53], crack growth prediction [54], strain fields in patched repairs [55,56], and failure analysis of joints [57]. The material is typically link to specific industry applications (composites and composites repair for aerospace [58][59][60][61], wind energy [62], boat construction [63], pipe industry [64]) or with the development of health monitoring techniques for field service assessment [65][66][67][68]. However, there is paucity of information regarding quantification of the actual damage that the previously described mechanisms (plastic zones at crack tips, particle cavitation, and shear banding) can introduce in actual structural adhesives.…”

Section: Equationmentioning

confidence: 99%

Links between surface morphology changes and damage in a toughened epoxy adhesive

Trimiño

Cronin

2021

The Journal of Adhesion

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Owing to the increased use of toughened epoxy adhesives in current transportation light weighting efforts, it is critical that the damage mechanisms observable as strain whitening in these materials are understood and quantified. Quantification of damage is needed for finite element constitutive models used in structural design; however, thin bond lines in adhesive joints limit direct observation of the adhesive. In this study, microscope observations of bulk material specimens subjected to tensile loading were linked to strain whitening and damage in a toughened epoxy adhesive. Cracks on the surface were observed to open during loading, with strain whitening at the crack tips and with the initiation and propagation of shear bands. The stresses approximated at the crack tips suggested that particle cavitation could be occurring in these regions. Image analysis showed that strain whitening was present at crack tips and that these areas served to initiate the shear-bands. Changes in tensile specimen stiffness and strength were evaluated during load-unload and reload testing, and were linked to the presence of crack growth, as well as the formation of shear bands. Considering changes in strength, the predicted damage level before failure (D~18%) was lower than that predicted using traditional load-unload stiffness (D~35%), attributed to short-term viscoelastic effects; however, damage calculated from load-reload material stiffness (D~19%) was in good agreement with the damage estimated from changes in strength. A new approach, calculating damage from direct image analysis of strain whitening on the free surface (D~21%) was in good agreement with damage quantified by changes in strength and stiffness, with the benefit of quantifying damage over the loading history of the test sample and identifying areas of damage localization.

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Contamination-Induced Degradation/Enhancement of Interfacial Toughness and Strength in Polymer-Matrix Composite Interfaces

Yavas

Shang

Bastawros

2017

Conference Proceedings of the Society for Experimental Mechanics Series

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Utilization of nanoindentation to examine bond line integrity in adhesively bonded composite structures

Cited by 11 publications

References 26 publications

Mechanical degradation due to vacancies produced by grain boundary corrosion of steel

Mechanical degradation due to vacancies produced by grain boundary corrosion of steel

Links between surface morphology changes and damage in a toughened epoxy adhesive

Contamination-Induced Degradation/Enhancement of Interfacial Toughness and Strength in Polymer-Matrix Composite Interfaces

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