Scarf repairs to highly strained graphite/epoxy structure

Baker, A.A.; Chester, R.; Hugo, G. R.; Radtke, T. C.

doi:10.1016/s0143-7496(98)00031-1

Cited by 60 publications

(23 citation statements)

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“…2(a)) [38,77]. This choice can also be imposed by accessibility difficulties to the inner face of the composite structure, or be rendered unfeasible for sandwich laminates with composite faces [78]. Gunnion and Herszberg [68] …”

Section: Strength Analysis For the Scarf Repairs With Over-laminatingmentioning

confidence: 99%

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: Strength Analysis For the Scarf Repairs With Over-laminatingmentioning

confidence: 99%

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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show abstract

“…There is potential for a scarf repair to experience creep deformation since unlike the external patch there are no extensive low-stress regions to anchor the patch [13]. However, because of load bypass in a repair creep would be much less than in an equivalent joint.…”

Section: Scarf Repairmentioning

confidence: 99%

A Proposed Approach for Certification of Bonded Composite Repairs to Flight-Critical Airframe Structure

Baker

2010

Appl Compos Mater

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This paper focuses on the difficult issue of the certification of adhesively bonded repairs in applications where credit has to be given to the patch for restoring residual strength in flight-critical structure. The scope of the paper includes both adhesively bonded composite repairs to composite components and composite repairs to metallic components. After discussing typical bonded repairs and, as a baseline, procedures currently used to certify new structure, a proposal is made which may constitute an acceptable basis for the structural certification of repairs. The key requirement is to demonstrate an acceptably low probability of patch disbonding during the remaining life of the structure. The focus is on one-off repairs where development of a comprehensive certification procedure based even on limited testing will be infeasible:

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“…This way, the former end can be connected to the composite part of the structure while the latter end can be joined to the steel part. For example, two composite parts can be connected using the scarf joint technique (Lubkin, 1957;Hart-Smith, 1973;Erdogan and Ratwani, 1971;Baker et al, 1999;Pipes et al, 1982;Gunnion and Herszberg, 2006;Ganesh and Choo, 2002;Kwon et al, 2008a) and two steel parts can be welded.…”

Section: Introductionmentioning

confidence: 99%

Interface fracture of hybrid joint of glass‐/steel‐fiber composite

Boseman

Kwon

Loup

et al. 2012

Engineering Computations

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Purpose -In order to connect a fiberglass composite structure to a steel structure, a hybrid composite made of glass and steel fibers has been studied. The hybrid composite has one end section with all glass fibers and the opposite end section with all steel fibers. As a result, it contains a transition section in the middle of the hybrid composite changing from glass fibers to steel fibers. The purpose of this paper is to examine interface strength at the glass to steel fiber transition section, in order to evaluate the effectiveness of the hybrid composite as a joining technique between a polymer composite structure and a metallic structure. Design/methodology/approach -The present micromechanical study considers two types of glass to steel fiber joints: butt and overlap joints. For the butt joint, the end shape of the steel fiber is also modified to determine its effect on interface strength. The interface strength is predicted numerically based on the virtual crack closure technique to determine which joint is the strongest under various loading conditions such as tension, shear and bending. Numerical models include resin layers discretely. A virtual crack is considered inside the resin, at the resin/glass-layer interface, and at the resin/steel-layer interface. The crack is located at the critical regions of the joints. Findings -Overall, the butt joint is stronger than the overlap joint regardless of loading types and directions. Furthermore, modification of an end shape of the middle fiber layers in the butt joint shifts the critical failure location. Originality/value -The paper describes one of a few studies which investigated the interface strength of the hybrid joint made of fiberglass and steel-fiber composites. This joint is important to connect a polymeric composite structure to a metallic structure without using conventional mechanical joints.

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Scarf repairs to highly strained graphite/epoxy structure

Cited by 60 publications

References 0 publications

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

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

A Proposed Approach for Certification of Bonded Composite Repairs to Flight-Critical Airframe Structure

Interface fracture of hybrid joint of glass‐/steel‐fiber composite

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