Mode II fracture energy characterization of brittle adhesives using compliance calibration method

Akhavan‐Safar, A.; Salamat‐talab, Mazaher; Ajdani, Arsalan; Ayatollahi, M.R.; Silva, Lucas F. M. da

doi:10.1111/ffe.13244

Cited by 16 publications

(5 citation statements)

References 27 publications

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“…59,60 As an example, Wang et al 60 calculated the fracture energy of a CFRP to titanium end-loaded split (ELS) specimen using dissimilar material corrected beam theory with effective crack length (DM-CBTE). However, as some studies were performed on estimating fracture energies for mode-I and II through conventional methods, 55,58,61 it can be seen that they can still be used for estimation purpose, while they are more conservative than that of the newly developed relationships for dissimilar joints.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…The critical energy release rate for a cracked component is presented as below 46 :

G_{IIC} goodbreak= \frac{P^{2}}{2 b} \frac{normald C}{normald a}

where a , C ,

P

, and b are the crack length, compliance defined as

C = δ / P

, applied load, and width of the tested cracked plate, respectively. Equation (1) is only valid for compliance calibration method 47 that needs a series curve fitting of compliance and crack propagation length relation.…”

Section: Data Reduction Schemementioning

confidence: 99%

Bondline thickness effect on fracture and cohesive zone model of sintered nano silver adhesive joints under end notched flexure tests

Dai

Zan

et al. 2023

Fatigue Fract Eng Mat Struct

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Bondline thickness effect on fracture behaviors and cohesive zone model (CZM) is an important topic for adhesive joints. In this paper, the fracture and CZM of sintered nano silver adhesive joints are investigated based on end notched flexure (ENF) test. Results show that load versus displacement curves of sintered silver adhesive joints is sensitive to the bondline thickness. With compliance‐based beam method (CBBM), the shearing fracture toughness of sintered silver bonded joints heightens with the increase of bondline thickness, which indicates that shearing fracture toughness is highly dependent on bondline thickness. R curves increase steeply for short equivalent crack length and become plateau for long equivalent crack length. The cracking morphology shows that the cracking paths are mainly interfacial and interlayer types. The bilinear CZM is also presented. The bondline thickness effect on CZM parameter is presented and discussed. The CZM given in this paper can be adopted for reliability analysis in power devices.

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“…The proposed model could provide higher values than those calculated by the simplified models. Akhavan-Safar et al 16 studied the mode II fracture of ENF adhesive joints with brittle adhesive using the CCM. The method can provide reliable data reduction result compared with the classic method.…”

Section: Introductionmentioning

confidence: 99%

A calculation method for the mode II fracture energy release rate of dissimilar materials adhesively bonded structures

Wang

Ding

Jiang

et al. 2023

Fatigue Fract Eng Mat Struct

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Nowadays, fracture characterization of dissimilar materials adhesively bonded structures still generally refers to standards for fiber‐reinforced plastic composites. Moreover, the calculation methods of fracture energy release rate specified in these standards often lead to great deviation due to the differences in material properties and geometry. In this paper, dissimilar materials corrected beam theory with effective crack length (DM‐CBTE) method for calculation of mode II fracture energy release rate of dissimilar materials adhesively bonded structures was proposed. The differences in material properties and geometry as well as the effect of clamp were all considered. The experimental and J‐integral numerical analysis results showed that the maximum deviation of the GIIC calculated by the methods recommended in standard from the J‐integral result is 28% while that by the DM‐CBTE method is only 5%, which proved good feasibility of the DM‐CBTE method for evaluation of mode II fracture performance of dissimilar materials adhesively bonded structures.

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Mode II fracture energy characterization of brittle adhesives using compliance calibration method

Cited by 16 publications

References 27 publications

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

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

Bondline thickness effect on fracture and cohesive zone model of sintered nano silver adhesive joints under end notched flexure tests

A calculation method for the mode II fracture energy release rate of dissimilar materials adhesively bonded structures

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