A 3D analysis of crack-front shape of asymmetric repaired aluminum panels with composite patches

Djebli, Abdelkader; Besseghier, El Hadj; Bendouba, M.; Baltach, Abdelghani; Aid, A.

doi:10.3221/igf-esis.49.51

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…In the same context, a thorough examination of this subject can be found in Refs. [7][8][9][10][11][12][13]. To determinate the fracture toughness parameters, there are several methods to calculate the stress intensity factor: those that use the correlation of the stress fields and / or displacement at the crack tip [1], hybrid methods [14], J integral [15][16], the approach of strain energy [17] and the virtual crack extension technique [18].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Size and Position of the Crack on the Normalized Stress Intensity Factor

Bendouba

Djebli

Baltach

et al. 2020

AJRESD

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In this work, finite element method was used to determine the normalized stress intensity factors for different configurations. For this, a 2-D numerical analysis with elastic behavior was undertaken in pure I mode. This simulation was carried out using a numerical calculation code. On the basis of the numerical results obtained from the different models treated, there is a good correlation between the nodal displacement extrapolation method (DEM) and the energy method based on the Rice integral (J) to evaluate the normalized stress intensity factors and this for different crack lengths. For each configuration, the increase in the crack size causes an amplification of normalized intensity stresses fators.

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Section: Introductionmentioning

confidence: 99%

The Effect of the Size and Position of the Crack on the Normalized Stress Intensity Factor

Bendouba

Djebli

Baltach

et al. 2020

AJRESD

Self Cite

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Elliptical one-side composite bonded repair analysis through a differential evolution algorithm

Chamorro-Cruz

López-Santiago²,

Vázquez-Castillo³

et al. 2023

AEAT

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Purpose The purpose of this study is to determine the optimal shape of a one-sided elliptical composite material patch of an adhesively bonded repair of cracked metal plates under biaxial stress. Design/methodology/approach The approach consists on determining the patch topology and adhesive thickness that minimize the stress intensity factor and the bending moment caused by the asymmetry of the repair by applying a differential evolution algorithm with a selection phase using the Deb’s rules. Findings The results demonstrate that an elliptical patch of major axis length equal to the plate width, and minor axis length equal to the crack length, with a thin adhesive thickness, provides the highest stress intensity factor and bending moment reduction, maximizing the fatigue life of the repair. Research limitations/implications The results are limited to linear elastic behavior of the cracked plate and a fully rigid bond between the cracked plate and the patch. The effectiveness of the repair was verified by theoretical calculation of the fatigue life, thus experimental validation is still needed. Practical implications The results of this work can be applied to experimental validations of the effectiveness of the elliptical one-side composite bonded repairs, avoiding and extensive number of experiments, and also, encourage maintainers to explore on this technique that is more economical and easier to apply, in comparison to other repair techniques. By following the patch geometry recommendations proposed herein, it is analytically predicted that the fatigue life may increase by as much as 27 times that of the unpatched plate. Originality/value Currently, there are no detailed studies that assess one-side patch repair procedures, which require consideration of the bending moment and biaxial stress state, and therefore, the optimal patch geometry and adhesive thickness are unknown.

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A 3D analysis of crack-front shape of asymmetric repaired aluminum panels with composite patches

Cited by 2 publications

References 25 publications

The Effect of the Size and Position of the Crack on the Normalized Stress Intensity Factor

The Effect of the Size and Position of the Crack on the Normalized Stress Intensity Factor

Elliptical one-side composite bonded repair analysis through a differential evolution algorithm

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