Finite Element Analysis of Patched Cracks

The performance of a bonded repair for cracked holes has been studied using the three dimensional finite element method, linear elastic fracture mechanics and strain energy density theory. Increasing the composite patch size reduces the strain energy level at the crack tip; increasing the patch length normal to the crack is a better choice. The stacking sequences of the laminated patch have little influence on the strain energy distribution in the vicinity of the crack. To repair the cracked holes of aircraft components subjected to variable direction loading during flight, the orientations of the patch ply, 90 ~ and 4-45 ~ with respect to the crack direction, are the optimum selection in bonded repairs.

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“…In reality, composite patches with dropping-off plies [20,21] are proposed to reduce these high stresses so as to prevent debonding.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, high effective stresses in the adhesive appear near the patch edge and may cause it to debond. To reduce the possibility of distortion damage, a taper angle at the patch edge should be introduced by dropping off patch plies[20,21]. The maximum effective stress in the adhesive occurs at the patch edge near the hole and the crack.…”

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confidence: 99%

The effects of size and stacking sequence of composite laminated patch on bonded repair for cracked hole

1996

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“…Several theoretical investigations into the repair of composites have also been undertaken [46,47,48,49]. References [46,47,49] are primarily concerned with the repair of holes in composites while [48], using an extension of the bonded element developed in [27], considers the repair of cracks and holes. Whereas [46] only considered a bonded metallic repair, [47,48] consider both composite and metallic repairs and conclude that for holes in composites a metallic repair has certain advantages over a composite repair scheme.…”

Section: Adhesive Elementmentioning

confidence: 99%

Analysis of composite laminates and fibre composite repair schemes

Jones

Callinan

1981

Fibre Science and Technology

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“…Adhesively bonded repairs cause minimum stress concentration of damaged structural components as well as reducing stress intensity factor (SIF) at the crack tip [1,2]. The crack patching technique may alter the load path that induces efficient load transfer from cracked component to reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Implementation of Virtual Crack Closure Technique for Damaged Composite Plates Using Higher-Order Layerwise Model

Woo

Ahn

2015

Advances in Materials Science and Engineering

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A higher-order layerwise model is proposed to determine stress intensity factors using virtual crack closure technique for singleedge-crack aluminum plates with patch repairs. The present method is based on -convergent approach and adopts the concept of subparametric elements. In assumed displacement fields, strain-displacement relations and three-dimensional constitutive equations of layers are obtained by combination of two-and one-dimensional shape functions. Thus, it allows independent implementation of -refinement for in-plane and transversal displacements. In the proposed elements, the integrals of Legendre polynomials and Gauss-Lobatto technique are employed to interpolate displacement fields and to implement numerical quadrature, respectively. For verification of the present model, not only single-edge-crack plates but also V-notch aluminum plates are first analyzed. For patched aluminum plate with behavior of complexity, the accuracy and simplicity of the present model are shown with comparison of the results with previously published papers using the conventional three-dimensional finite elements based on ℎ-refinement.

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Finite Element Analysis of Patched Cracks

Cited by 107 publications

References 5 publications

The effects of size and stacking sequence of composite laminated patch on bonded repair for cracked hole

The effects of size and stacking sequence of composite laminated patch on bonded repair for cracked hole

Analysis of composite laminates and fibre composite repair schemes

Implementation of Virtual Crack Closure Technique for Damaged Composite Plates Using Higher-Order Layerwise Model

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