Bonded composite repair of cracked load-bearing holes

Paul, J.; Bartholomeusz, R.A.; Jones, Rhys; Ekstrom, M.

doi:10.1016/0013-7944(94)90134-1

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…They can be bolted, riveted or bonded. [7][8][9][10] Unfortunately, most of the existing processes do not take into account the specificities of composites such as the anisotropic properties. On composite structure, the repair process with a composite patch is time consuming and needs a well trained work force.…”

Section: Certified Repair Methodsmentioning

confidence: 99%

Investigation of composite repair method by liquid resin infiltration

Hautier

Lévêque

Huchette

et al. 2010

Plastics, Rubber and Composites

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Conventional' or certified repair procedures for impacted composite structures (i.e. patches) are time consuming, and must be performed by highly qualified staff. In this paper, a cost effective and simple repair method by liquid resin infiltration is studied. As damages on aircraft structures are generally due to impact, this kind of damage is characterised and compared to quasi-static indentation with ultrasonic inspection and micrographic cuts. The repair by liquid resin is used to fill in the very special damage pattern region organised as a crack network (delamination and transverse cracks). In order to study this new repair method, an experimental set-up has been manufactured and different configurations have been studied. Mechanical testing (CAI, DCB and ENF) was then performed to evaluate the strength of this repair. As good results were achieved, further exploration under complex loading should be performed to ensure the quality of the repair for an industrial application.

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Section: Certified Repair Methodsmentioning

confidence: 99%

Investigation of composite repair method by liquid resin infiltration

Hautier

Lévêque

Huchette

et al. 2010

Plastics, Rubber and Composites

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“…Celebrating Sixty Years of Publication and Jones 18 of experimental results revealed in that the bonded boron-epoxy repaired aluminum alloy (7075-T6) specimens could provide a 15-time increase in life expectancy. In this study, the interface behaviour of pre-cracked Al 2024-T3 substrates with bonded carbon-epoxy patches have been investigated numerically.…”

Section: Adhesively-bonded Patch Repair With Compositesmentioning

confidence: 99%

Adhesively-bonded Patch Repair with Composites

Pandey¹,

Kumar²

2010

DSJ

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Adhesively-bonded composite patch repairs over cracked or corrosion-damaged metallic aircraft structures have shown great promise for extending life of ageing structures. This study presents the numerical investigation into the interface behaviour of adhesively-bonded cracked aluminum alloy substrate patched with fibre-reinforced composite material. The adhesive is modelled as an elasto-plastic bilinear material to characterise the debond behaviour, while the defective substrate is regarded as linear elastic continuum. Two typical patch shapes were selected based on information available in the literature. Geometric and material nonlinear analyses for square and octagonal patches were performed to capture peel and shear stresses developed between the substrate and the patch to examine the possibility of interface delamination/debonding. Parametric studies on adhesive thickness and patch thickness were carried out to predict their infuence on damage tolerance of repaired structures.

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“…Firstly, technical equipment repairs are more and more often taking advantage of structural bonding [11][12][13][14][15] (elements of aircrafts made of composite materials, sandwich structures), as well as, quick chemically setting materials; so-called, adhesive composites, which create new possibilities in the scope of expedient or permanent removal of different types of damages (e.g. cracks, cut-throughs, and lack of tightness) [16][17][18][19][20]. A broader implementation of the modern repair technologies connected with the use of adhesive materials for military technology repairs could considerably improve the process of field repairs [3,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Methodology of assessment of adhesive composites’ properties

Smal

2013

Polimery

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The paper presents research proposition of methodology of adhesive composites' properties assessment, which was developed on the basis of numerous own researches and analysis of references. Using the proposed methodology, there were conducted experimental tests of a new Belzona 1831 adhesive composite, which can be applied on the wet and insufficiently cleaned surfaces. It appeared that the tested material exhibits much lower compression strength and creep resistance in connection to field repairs of military equipment, than previously tested adhesive composite of "super metal" group -Belzona 1111. Therefore, it does not seem to be useful with repair that guarantee long lasting effectiveness, but only temporary repairs with relative low level of load of repaired element. In contrast to Belzona 1111, the researched adhesive composite can be applied on the wet surfaces since it showed adhesion to steel wet surfaces. Keywords: durability of materials, adhesive composites, mechanical properties of adhesive composites.METODYKA OCENY W£AOECIWOOECI KOMPOZYTÓW KLEJOWYCH Streszczenie -W pracy przedstawiono autorsk¹ propozycjê metodyki postêpowania badawczego, maj¹cego na celu okreoelanie w³aoeciwooeci kompozytów klejowych, istotnych ze wzglêdu na naprawy polowe sprzêtu wojskowego, z uwzglêdnieniem ich doraŸnooeci oraz trudnych warunków realizacji. Na pierwszym etapie postêpowania badawczego okreoela siê w³aoeciwooeci mechaniczne wykorzystuj¹c próbkê cylindryczn¹ wykonan¹ z badanego kompozytu (rys. 1), na drugim zaoe w³aoeciwooeci wytrzyma³ooeciowe próbek wa³eczkowych obci¹¿onych na odrywanie (rys. 2). Na trzecim, fakultatywnym etapie jest przewidziana ocena w³aoeciwooeci wytrzyma³ooeciowych badanego tworzywa, w odniesieniu do ró¿nych specyficznych czynników, takich jak: rodzaj klejonego materia³u, sposób przygotowania powierzchni lub temperatura utwardzania z³¹cza klejowego. To badanie proponuje siê realizowaae z wykorzystaniem próbek p³askich, obci¹¿onych na oecinanie (rys. 3). Na podstawie zaproponowanej metodyki zbadano w³aoeciwooeci nowego materia³u Belzona 1831 oraz porównano je z cechami znanego i przebadanego wczeoeniej kompozytu klejowego Belzona 1111. Wykazano, ¿e zaproponowana metodyka oceny w³aoeciwooeci kompozytów klejowych wydaje siê u¿yteczna dla potrzeb okreoelenia ich przydatnooeci do napraw polowych sprzêtu wojskowego. S³owa kluczowe: wytrzyma³ooeae materia³ów, kompozyty klejowe, w³aoeciwooeci mechaniczne kompozytów klejowych.

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Bonded composite repair of cracked load-bearing holes

Cited by 16 publications

References 5 publications

Investigation of composite repair method by liquid resin infiltration

Investigation of composite repair method by liquid resin infiltration

Adhesively-bonded Patch Repair with Composites

Methodology of assessment of adhesive composites’ properties

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