Bonded Composite Patch Repairs on Cracked Aluminum Plates: Theory, Modeling and Experiments

Ricci, Fabrizio; Franco, Francesco; Montefusco, Nicola

doi:10.5772/16227

Cited by 14 publications

(12 citation statements)

References 25 publications

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“…Prior to repair validation, the FE model of the unrepaired plate (cracked plate without a patch) was also validated using a fracture mechanics analytical solution [14]. Comparing the results gained by Tada's analytical solution [14] according to equation (2) and the present finite element results, there is a good agreement, as shown in Table 6.…”

Section: Validation Of Finite Element Modelsupporting

confidence: 51%

“…Considering mechanical performances and manufacturing aspects, this rectangular shape represents a better compromise. Therefore, the patch size was chosen as the minimum patch size that completely covers the crack length and improves the mechanical behavior of the cracked plate under the mode I loading [2].…”

Section: Patch Shapementioning

confidence: 99%

“…A circular notch in an aluminum 2024-T3 plate repaired with a graphite/epoxy composite patch was investigated using that code [1] where the developed geometry of the plate and patch were not carried out using a 3D element formulation that can be close to experimental work. Using the same FE code, https://doi.org /10.31436/iiumej.v20i2.912 another study investigated the effect of adhesive layers to repair the cracked plate with bonded composite patch in which distinct types of adhesives were used and the best one was selected to reduce the stress intensity factor (SIF) and strain energy release rate (SERR) [2]. Later, an algorithm was added to that FE code to simulate the temperature effect to determine reduction of SIF [3].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Bonded Composite Patch on the Stress Intensity Factors for a Center-Cracked Plate

Aabid¹,

Hrairi²,

Ali³

et al. 2019

IIUMEJ

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Crack propagation until fracture is an important criterion to predict a structure‘s service life. In order to increase the latter, the cracked component needs to be repaired or replaced. In the present study, a finite element analysis has been carried out to investigate the effects of adhesive thickness, patch thickness and crack length on the passive repair performance of a center-cracked rectangular aluminum plate under mode-I loading condition using an ANSYS package. A comprehensive parametric study shows that the stress intensity factor is influenced by the patch thickness, patch size, adhesive material, and adhesive thickness. ABSTRAK: Penyebaran retak sehingga patah adalah kriteria penting bagi menjangka hayat struktur. Bagi memanjangkan jangka hayat struktur, komponen keretakan perlu dibaik pulih atau diganti. Kajian ini telah menjalankan analisis elemen tak terhingga bagi mengetahui kesan ketebalan pelekat, ketebalan tampalan dan panjang retak pada bahagian keretakan tengah plat petak aluminium yang dibaiki secara pasif, menggunakan pakej ANSYS di bawah beban mod-I. Kajian parametrik yang menyeluruh menunjukkan faktor tekanan intensif dipengaruhi oleh ketebalan tampalan, saiz tampalan, bahan pelekat dan ketebalan pelekat.

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Section: Validation Of Finite Element Modelsupporting

confidence: 51%

Section: Patch Shapementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Bonded Composite Patch on the Stress Intensity Factors for a Center-Cracked Plate

Aabid¹,

Hrairi²,

Ali³

et al. 2019

IIUMEJ

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“…In this work, the analytical and numerical analysis of centre cracked Aluminium plate [4,10], under the given loading and boundary conditions are done. The analysis is carriedout for three different configurations of the structure.…”

Section: Finite Element Analysis Of Composite Patch Repaired Cramentioning

confidence: 99%

Finite Element Analysis of the Composite Patch Repairs of the Plates

Ramakrishna¹,

Balu²

2017

IJERA

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ABSTRACT:Adhesively-bonded patches are used for repair of different types of damages such as holes, notches, scratches, cracks etc. occurring in metallic as well as composite structures. The composite patching is the most widely used method of restoring the load-carrying capacity of the weakened structure. Due to the rapid growth of aerospace industry, analysis of adhesively-bonded patches to repair cracked structures have been the focus for many years. Most of these studies investigated repaired structures using linear analysis and demonstrated the viability of adhesively-bonded patch-repairs as a means to improve the durability and damage tolerance of cracked metallic structures efficiently and economically.Many researchers performed more intensive research on the method and presented the advantages of a composite material patch used for the cracked plate repairing. It was found that the bonded patch method not only reduces the weight but also increases the service life.In this research work, the analysis of cracked metallic and composite plates which are repaired by bonded-composite patches is performed using Finite Element Analysis package FRANC2D/L. This package is available with its corresponding mesh generating program CACSA. They are developed by Cornel Fracture Group, Cornel University.In this study, various fracture parameters for the structures are found out. It revealed that, the application of the bonded composite patches effectively reduces the stress intensity factor (SIF) near the crack tip and hence retards or eliminates the crack propagation. As the chances of fracture are almost reduced, the life of the structures increases by almost double of the initial. The main advantage of this patch repair technology is that, it doesn't increase the weight of the structure too much.

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“…In patched specimen, the stress intensity factor depends on presence of composite patch and width of the patch and numbers of plies. Evaluation of boundary correction function for evaluation of stress intensity factor is detailed in research of Ratwani [33], Boyd et al [30] and Ricci et al [34]. This analysis is based on a Green's function method.…”

Section: Stress Intensity Factormentioning

confidence: 99%

Fatigue crack growth of composite patch repaired Al-alloy plates under variable amplitude loading

Seriari

Benachour

Benguediab

2017

Frattura Ed Integrità Strutturale

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In this paper, fatigue crack growth of edge crack in 2024 T351 aluminum alloy plate repaired with bonded composite patch under constant and variable amplitude loading (VAL) was predicted. The Al-alloy plate was repaired with symmetric patch "Boron/Epoxy". Additionally to constant amplitude loading (CAL), the effects of single overload and band overload were investigated for repaired and unrepaired Al-alloy plates. The obtained results confirm the improvement in repair performances by composite patch on fatigue lives and crack growth rates for all applied cycles (CAL and VAL) compared to unrepaired plates. A retardation effect was observed in application of single overload compared to band overload with the same stress ratio (R=0.2) for unpatched plate and characterized by instantaneous delays. However, this retardation effect is increased by the presence of the patch repair which leads to the higher fatigue life. Retardation effect was neglected for lower overload ratio (ORL>1.8). Comparison in fatigue life and crack growth rates under the same overload ratio (ORL=2.4) between repaired and unrepaired plates show the supplementary beneficial effects in combination of overloading and patch repair KEYWORDS.

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Bonded Composite Patch Repairs on Cracked Aluminum Plates: Theory, Modeling and Experiments

Cited by 14 publications

References 25 publications

Effect of Bonded Composite Patch on the Stress Intensity Factors for a Center-Cracked Plate

Effect of Bonded Composite Patch on the Stress Intensity Factors for a Center-Cracked Plate

Finite Element Analysis of the Composite Patch Repairs of the Plates

Fatigue crack growth of composite patch repaired Al-alloy plates under variable amplitude loading

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