Assessment of local strain field in adhesive layer of an unsymmetrically repaired CFRP panel using digital image correlation

Kashfuddoja, Mohammad; Ramji, M.

doi:10.1016/j.ijadhadh.2014.10.005

Cited by 21 publications

(6 citation statements)

References 41 publications

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“…They demonstrated that localised strain distributions at mesoscopic scale around the discontinuity between the adherends could be effectively evaluated using high magnification levels. Kashfuddoja et al 18 conducted an assessment of thickness displacement and local strain field in the thin adhesive layer of a single sided patch repaired CFRP panel subjected to tensile load. DIC allowed an accurate characterisation of global and local strain (longitudinal, peel and shear strain) in the thin adhesive layer and monitoring of damage in the patch repaired joints.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

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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show abstract

“…Until now, many approaches have been proposed to analyze the behavior of steel components strengthened with CFRP patches [43][44][45][46][47], including nonlinear theory [48], digital image correlation (DIC) [49][50][51][52], extended nite element method (XFEM) [53,54] and cohesive zone model (CZM) [55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

A novel approach to modelling the bond characteristics between CFRP fabrics and steel plate joints under quasi-static tensile loads

Hamedi

Kamyabi-Gol

2021

Int J Adv Manuf Technol

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Carbon ber reinforced polymer (CFRP) materials have been effectively used as externally bonded sheets to repair damaged steel structures such as airplanes and ships. In this study, a series of double strap joints with different bonding lengths are considered and examined to experimentally and theoretically assess the effective bond length. Various models exist in the literature which are used to predict the strength of steel and CFRP joints under various loading conditions. Non-linear Lagrange stress method (NLS) which is a novel stress-based method for predicting the failure load values is presented for the rst time. This approach is based on 2D and 3D linear elastic nite element analysis. Relying only on two experimental tests, the new approach proposed here can quickly and easily predict the failure load in steel/CFRP samples. In this methodology, it is assumed that the adhesive joint will fail as the normal stress along the adhesive mid-line reaches a predetermined value at a critical distance. In addition, experimental data on steel/CFRP joints gathered from the literature are compared to predictions using the NLS method. It was found that results from the theoretical predictions (NLS) were in good agreement with experimental tests conducted on double strap joints. It was also revealed that the average accuracy of the NLS method is superior to other methods such as cohesive zone model and Hart-Smith. The results revealed that under the best conditions, the NLS model is 5 times more accurate than existing models.

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Section: Introductionmentioning

confidence: 99%

A novel approach to modelling the bond characteristics between CFRP fabrics and steel plate joints under quasi-static tensile loads

Hamedi

Kamyabi-Gol²

2021

Preprint

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Carbon fiber reinforced polymer (CFRP) materials have been effectively used as externally bonded sheets to repair damaged steel structures such as airplanes and ships. In this study, a series of double strap joints with different bonding lengths are considered and examined to experimentally and theoretically assess the effective bond length. Various models exist in the literature which are used to predict the strength of steel and CFRP joints under various loading conditions. Non-linear Lagrange stress method (NLS) which is a novel stress-based method for predicting the failure load values is presented for the first time. This approach is based on 2D and 3D linear elastic finite element analysis. Relying only on two experimental tests, the new approach proposed here can quickly and easily predict the failure load in steel/CFRP samples. In this methodology, it is assumed that the adhesive joint will fail as the normal stress along the adhesive mid-line reaches a predetermined value at a critical distance. In addition, experimental data on steel/CFRP joints gathered from the literature are compared to predictions using the NLS method. It was found that results from the theoretical predictions (NLS) were in good agreement with experimental tests conducted on double strap joints. It was also revealed that the average accuracy of the NLS method is superior to other methods such as cohesive zone model and Hart-Smith. The results revealed that under the best conditions, the NLS model is 5 times more accurate than existing models.

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Assessment of local strain field in adhesive layer of an unsymmetrically repaired CFRP panel using digital image correlation

Cited by 21 publications

References 41 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

A novel approach to modelling the bond characteristics between CFRP fabrics and steel plate joints under quasi-static tensile loads

A novel approach to modelling the bond characteristics between CFRP fabrics and steel plate joints under quasi-static tensile loads

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