Mixed-mode fracture analysis of aluminium repaired panels using composite patches

Hosseini‐Toudeshky, Hossein; Mohammadi, Bijan; Daghyani, Hamid Reza

doi:10.1016/j.compscitech.2005.04.028

Cited by 46 publications

(29 citation statements)

References 9 publications

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“…1. The lay‐up configurations were defined based on the results of our previous finite element investigations on the variation of the fracture parameters due to the variation of the unidirectional lay‐ups angle (θ) of repaired panels 11,13 . The boron/epoxy composite patch was used in these panels.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, in many studies the stress and strain fields of the mid‐plane have been used to calculate the fracture parameters 6–9 ; however, the maximum stresses and strains occur on the unpatched surface of the repaired panels 10 . The stress variations through the thickness of the cracked panels in single‐side repairs produces non‐uniform crack propagation along the panel's thickness leading to a curvilinear crack‐front shape and various crack propagation paths at patched and unpatched surfaces of the repaired panels 11–13 …”

Section: Introductionmentioning

confidence: 99%

“…The analyses are only carried out for the panels with the typical inclined crack of 45° in mixed‐mode conditions due to the expenses of the experimental investigations and the existence of maximum interaction between fracture modes before crack propagation. The patch lay‐up configurations are selected based on the results of numerical investigations of the repaired panels containing an initial inclined crack, which were already performed by the authors 10,11,13 . The obtained experimental results are compared with those predicted using the finite element analysis results.…”

Section: Introductionmentioning

confidence: 99%

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Mixed‐mode fatigue crack growth of thin aluminium panels with single‐side repair using experimental and numerical methods

Hosseini‐Toudeshky

Mohammadi

Bakhshandeh

2007

Fatigue Fract Eng Mat Struct

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A B S T R A C T In this paper, experimental and numerical fatigue crack growth of thin aluminium panels containing a central inclined crack of 45 • with single-side glass/epoxy composite patch are performed. Effects of patch lay-up configuration on the restarting crack growth (crack re-initiation) life and crack growth rate of the repaired panels are investigated. The obtained experimental results are compared with those predicted using finite element analysis based on both mid-plane and unpatched surface fracture parameters. In the finite elements analyses, it is assumed that the crack-front remains perpendicular to the panel's surfaces during its propagation. It is shown that the finite element crack re-initiation and propagation lives predictions using the unpatched surface results are too conservative. However, the finite element mid-plane results lead to a non-conservative life prediction. It is experimentally shown that, the most effective patch lay-up configurations to retard the crack growth of the repaired panels is [−45/+45] 2 ; however, the most life extension including the crack propagation cycles belongs to the patch lay-up of [90 4 ]. It is also shown that using the asymmetric patch lay-up configuration similar to [90 2 /0 2 ] with a proper bonding process may lead to a very slow crack growth rate, even slower than the patch lay-up of [90 4 ].

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mixed‐mode fatigue crack growth of thin aluminium panels with single‐side repair using experimental and numerical methods

Hosseini‐Toudeshky

Mohammadi

Bakhshandeh

2007

Fatigue Fract Eng Mat Struct

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“…In this field, Hosseini Toudeshky et al [5][6][7] Mall et al [8] and Bouiadjra et al [9,10] performed some finite element and experimental researches in order to determine the influence of various characteristics of this technique on enhancement of service life and reduction of crack growth in the aluminum plates under tension and cyclic loading. The authors of present paper investigated the influence of FRP pultruded sheets with various aspect ratios patched on the plates on the buckling load of the plates through FE modeling, [11].…”

mentioning

confidence: 99%

Enhancing Ultimate Compressive Strength of Notch Embedded Steel Cylinders Using Overwrap CFRP Patch

Kabir

Nazari

2011

Appl Compos Mater

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In this study, the application of Fiber Reinforced Polymer (FRP) patch for strengthening of the damaged area in thin walled steel cylinders under compression loading was investigated. In this direction, some experimental tests were carried out on the selected notch induced specimens with unique diameter-to-thickness ratio (D/t). The obtained results were compared to the intact cylinder in order to find out the reduction effect of notch on the buckling load of cylinders. Following that, the notched specimens were treated using externally FRP by wrapping around the notched area and the stability strength of the retrofitted specimens was measured experimentally. The investigation was also carried out in numerical analysis using FEM in order to develop the proposed technique for determination of optimum FRP configurations and also better understanding of the experimental observations considering the nonlinear behavior and failure modes for composite member.

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“…Wang and Rose [2] also performed theoretical investigations on the analyses of single-side repairs in mode-I condition without crack growth consideration. Hosseini-Toudeshky et al [3][4][5][6][7] performed 3-D finite elements fatigue crack growth analysis of single-side repaired aluminium panels to predict the crack trajectory, actual crack-front shape and crack growth life for various panels with cracks in mode-I and mixed mode conditions. They also performed experimental analyses of repaired panels using different composite patches under various fracture mode conditions to investigate the accuracy of the developed numerical methods and to obtain the realistic crack-front [3,[8][9][10].…”

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confidence: 99%

Fatigue Debonding Analysis of Repaired Aluminium Panels by Composite Patch using Interface Elements

2011

Self Cite

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Repaired panels with composite patches subjected to fatigue loading may fail due to the progressive debonding between the composite patch and aluminium panel. The objective of this paper is to study the initiation and propagation of a possible fatigue debonding in the adhesive layer while the crack also growths in the panel for single-side repaired aluminium panels. For this purpose three dimensional finite elements method with a thin layer solid like interface element is employed. Fracture mechanics approach is used for the analysis of crack growth in aluminium panel and the interface elements with fatigue constitutive law for mixed mode debonding growth in the adhesive layer. A user element routine and a damage model material routine were developed to include the interface element and to simulate the initiation and propagation of damage in adhesive layer under cyclic loading. It is shown that, the debonding propagation and crack growth rate of the repaired panels depend on the composite patch material and interface bonding properties significantly. It is also shown that using of patch material with higher elastic module leads to the faster damage or debonding growth in the adhesive layer during the fatigue loading.

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Mixed-mode fracture analysis of aluminium repaired panels using composite patches

Cited by 46 publications

References 9 publications

Mixed‐mode fatigue crack growth of thin aluminium panels with single‐side repair using experimental and numerical methods

Mixed‐mode fatigue crack growth of thin aluminium panels with single‐side repair using experimental and numerical methods

Enhancing Ultimate Compressive Strength of Notch Embedded Steel Cylinders Using Overwrap CFRP Patch

Fatigue Debonding Analysis of Repaired Aluminium Panels by Composite Patch using Interface Elements

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