Optimum shapes of scarf repairs

Wang, Chun H.; Gunnion, Andrew J.

doi:10.1016/j.compositesa.2009.02.009

Cited by 81 publications

(40 citation statements)

References 11 publications

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“…The primary motivation for this work stems from the known inconsistencies between the 2D approximations and the 3D repair [17,[56][57][58][59]. In fact, with the 2D simplification, stresses along the scarf bond are regarded as constant in the width direction of the repairs, thus neglecting the concentrations at the scarf edges near the longitudinal mid-plane of the 3D repair [29,56]. Moreover, the 2D simplified geometry does not capture the typical 3D stress effects of these repairs [60,61], which may result on a premature catastrophic failure at or near the interfaces between the composite and the adhesive layer [51].…”

Section: Introductionmentioning

confidence: 99%

“…Charalambides et al [13] tested experimentally scarf repairs with a¼ 21. Four distinct failures were identified, depending on the temperature and moisture design of scarf repairs is based on 2D models, as a simplification of the 3D geometry [53][54][55][56]. The primary motivation for this work stems from the known inconsistencies between the 2D approximations and the 3D repair [17,[56][57][58][59].…”

Section: Introductionmentioning

confidence: 99%

“…Four distinct failures were identified, depending on the temperature and moisture design of scarf repairs is based on 2D models, as a simplification of the 3D geometry [53][54][55][56]. The primary motivation for this work stems from the known inconsistencies between the 2D approximations and the 3D repair [17,[56][57][58][59]. In fact, with the 2D simplification, stresses along the scarf bond are regarded as constant in the width direction of the repairs, thus neglecting the concentrations at the scarf edges near the longitudinal mid-plane of the 3D repair [29,56].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical evaluation of three-dimensional scarf repairs in carbon-epoxy structures

Pinto¹,

Campilho

Moura

et al. 2010

International Journal of Adhesion and Adhesives

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The widespread employment of carbon-epoxy laminates in high responsibility and severely loaded applications introduces an issue regarding their handling after damage. Repair of these structures should be evaluated, instead of their disposal, for cost saving and ecological purposes. Under this perspective, the availability of efficient repair methods is essential to restore the strength of the structure. The development and validation of accurate predictive tools for the repairs behaviour are also extremely important, allowing the reduction of costs and time associated to extensive test programmes. Comparing with strap repairs, scarf repairs have the advantages of a higher efficiency and the absence of aerodynamic disturbance. This work reports on a numerical study of the tensile behaviour of three-dimensional scarf repairs in carbon-epoxy structures, using a ductile adhesive (Araldite s 2015). The finite elements analysis was performed in ABAQUS s and Cohesive Zone Modelling was used for the simulation of damage onset and growth in the adhesive layer. Trapezoidal cohesive laws in each pure mode were used to account for the ductility of the specific adhesive mentioned. A parametric study was performed on the repair width and scarf angle. The use of over-laminating plies covering the repaired region at the outer or both repair surfaces was also tested as an attempt to increase the repairs efficiency. The obtained results allowed the proposal of design principles for repairing composite structures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical evaluation of three-dimensional scarf repairs in carbon-epoxy structures

Pinto¹,

Campilho

Moura

et al. 2010

International Journal of Adhesion and Adhesives

View full text Add to dashboard Cite

show abstract

“…(3) and the asymptotic stresses determined from eqn. (2). Figure 9 shows the comparison of the finite element and asymptotic solutions of the shear stress  r distribution along different angular direction for a butt joint with E 1 = 200E 2 and subject to remote shear   without any applied remote tension or temperature change.…”

Section: Finite Element Analysis Of the Jointmentioning

confidence: 99%

“…Patch repair is an efficient and cost effective way of extending the service life of damaged engineering structures as it allows a localised in-situ repair of the damaged structure instead of a complete replacement. Patch repair of damaged composite structures involves the removal of sufficient material from the damaged area and replacing the removed material by adhesive bonding of new undamaged repair material to the structure that is being repaired, see for example [1,2]. Pipes with external corrosion can also be repaired by adhesive bonding of composite overwrap on the external surface of the pipe [3].…”

Section: Introductionmentioning

confidence: 99%

Fracture initiation in bi-material joints subject to combined tension and shear loading

Akisanya

2017

Journal of Adhesion Science and Technology

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Linear elastic solution of the stress field near an interface corner of bi-material joints is of the form Hr -1 , where r is the radial distance from the corner, H is the stress intensity factor and 1 is the order of the singularity. Finite element analysis is used to determine the magnitude of H for a butt joint subject to remote shear; the obtained solution complements existing solution for remote tension and uniform change in temperature. The theoretical solution of the singular shear stress is shown to be in good agreement with the corresponding finite element solution. The effect of combined remote tension, remote shear and uniform change in temperature on the failure loads and failure mechanisms is experimentally determined for brass/araldite/brass butt joint. It is shown that the failure envelope in tensile stress -shear stress space is elliptical and the failure loads decrease with increasing cure temperature due to thermal residual stress associated with the curing process. The application of the results to the assessment of onset of failure in composite patch repair is discussed.

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Effect of patch hybridization on the compression behavior of patch repaired glass/epoxy composite laminates using acoustic emission monitoring

Andrew

Arumugam

2016

Polymer Composites

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This article investigates the compressive response of damaged glass/epoxy composite laminates repaired using hybrid external patches. Hybrid external patches based on glass and Kevlar woven fabrics bonded on both faces of the damaged parent laminate were considered. Five different kinds of plain weave woven fabrics with a different ratio between glass and Kevlar fibers (100/0, 75/25, 50/50, 25/75, and 0/100) were used as the external patches. The intention of using these hybrid patches is to build up a patch of optimum stiffness that facilitate to restrict the critical adhesive or cohesive failure on the joints unlike high stiff glass fibers or extensive fiber micro‐buckling of the external patches unlike low stiff Kevlar fibers under compression loading and consequently to produce repaired laminates with a strain to failure and residual strength nearly close or similar as that of virgin or normal components. The virgin and damaged specimens were taken as the reference specimens for comparison of residual mechanical properties and damage mechanisms. Damage evolution and the failure progression of the repaired glass/epoxy specimens were monitored using real‐time Acoustic Emission (AE) monitoring technique. Specimens repaired with the equal volume fraction of glass and Kevlar fibers in the external patches presented the most favorable residual compressive response by effectively releasing the stress concentration in the damaged area. POLYM. COMPOS., 39:1922–1935, 2018. © 2016 Society of Plastics Engineers

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Optimum shapes of scarf repairs

Cited by 81 publications

References 11 publications

Numerical evaluation of three-dimensional scarf repairs in carbon-epoxy structures

Numerical evaluation of three-dimensional scarf repairs in carbon-epoxy structures

Fracture initiation in bi-material joints subject to combined tension and shear loading

Effect of patch hybridization on the compression behavior of patch repaired glass/epoxy composite laminates using acoustic emission monitoring

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