Fatigue crack growth study of CFRP patch repaired Al 2014-T6 panel having an inclined center crack using FEA and DIC

Srilakshmi, R; Ramji, M.; Chinthapenta, Viswanath

doi:10.1016/j.engfracmech.2014.12.012

Cited by 46 publications

(13 citation statements)

References 27 publications

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“…6 However, in most portion of the main plate thickness, the RF I value is positive, and the results presented in various references, show that the use of the one-sided patches is useful in extending the fatigue life of the structure. 26 For the boron-epoxy patch, the RF I values on the patched and unpatched sides is 61.4% and À33.5%, respectively, and the average SIF in mode I is 198:7 MPa ffiffiffiffiffiffiffiffi mm p , which is 14% less than the unrepaired value. Although, the difference in K I for different patch materials is not so significant, as the patch stiffness increases, the repair efficiency increases too.…”

Section: Effect Of the Patch Materials On The Sif Reductionmentioning

confidence: 93%

Parametric investigation of one-sided composite patch efficiency for repairing crack in mixed mode considering different thicknesses of the main plate

Mohammadi

2020

Journal of Composite Materials

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In this paper, parameters affecting the performance and durability of a one-sided composite patch for mixed-mode crack repairing is investigated, considering different thicknesses of the main plate. In different references, there is no unity of opinion on the effect of various parameters on the performance and durability of one-sided patches. In the present study, to eliminate this disagreement, 3D finite element method is employed. It is clear that the effect of each parameter strongly depends on the thickness of the repaired plate. Among the investigated parameters, the patch material, length and width of the patch, and adhesive thickness are more important and studied in this paper. Results reveal that the effect of different parameters on the performance and durability of one-sided patches depends not only on the thickness of the main plate but also on the patch material.

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Section: Effect Of the Patch Materials On The Sif Reductionmentioning

confidence: 93%

Parametric investigation of one-sided composite patch efficiency for repairing crack in mixed mode considering different thicknesses of the main plate

Mohammadi

2020

Journal of Composite Materials

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“…1 The works done in Walde and Lilhare 22 and Srilakshmi et al. 23 found that by applying the patch the fatigue life is almost twice as long. As the crack length increases, the stress concentration factor (SCF) increases further and tends to reach a limit value for the two-sided patch.…”

Section: The Patch Effectiveness and Comparing The One- And Two-sidedmentioning

confidence: 99%

A review on composite patch repairs and the most important parameters affecting its efficiency and durability

Mohammadi

Yousefi

Khazaei

2020

Journal of Reinforced Plastics and Composites

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In many industries, when replacement of a part is not possible or economic, the repair is done. One of the best methods for repairing metal and composite parts is using composite patches. Repairing with a composite patch is a widespread field to extend the service life of the cracked components. This technique is more structurally efficient with fewer damages on the structure than others. The bonded patch offers many advantages over a mechanically fastened doubler, which include improved fatigue behavior, reduced corrosion, and easy conformance to complex aerodynamic contours. In this article, advantages of the composite patch and its efficiency and durability are discussed, and the most important parameters (patch and adhesive thickness, patch separation, residual stress, patch length and width, etc.) affecting its performance are studied based on the latest available references.

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“…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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Fatigue crack growth study of CFRP patch repaired Al 2014-T6 panel having an inclined center crack using FEA and DIC

Cited by 46 publications

References 27 publications

Parametric investigation of one-sided composite patch efficiency for repairing crack in mixed mode considering different thicknesses of the main plate

Parametric investigation of one-sided composite patch efficiency for repairing crack in mixed mode considering different thicknesses of the main plate

A review on composite patch repairs and the most important parameters affecting its efficiency and durability

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

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