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dc.contributor.authorPitta, Siddharth
dc.contributor.authorRoure Fernández, Francisco
dc.contributor.authorCrespo Artiaga, Daniel
dc.contributor.authorRojas Gregorio, José Ignacio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria
dc.identifier.citationPitta, S., Roure, F., Crespo, D., Rojas, J.I. Investigation on repairs of aircraft composite structures made with various joining techniques. A: International Conference on Composite Structures. "21st International Conference on Composite Structures". 2018, p. 1-26.
dc.description.abstractIn the race for developing aircraft with lighter airframe, aiming at increasing aircraft payload and/or fuel efficiency, the shift from conventional metal structures to light-weight composite structures has attracted attention and competition among the aircraft manufacturers. Apart from fuel consumption, other operating costs such as maintenance costs play an important role in the aviation industry. Hence, since composites are increasingly used in light-weight airframes, understanding the behaviour of these materials under various load conditions is essential. Maintenance costs of aircraft include general maintenance and repairs, which are commonly seen as time-consuming, due to identification and installation of the repair. Repairs on damaged composite structures must be reliable and durable for a certain period with maximum confidence. In this study, structural repairs on Carbon Fibre Reinforced Epoxy (CFRE) structures are investigated with experiments and numerical analysis. Particularly, the substrate composite plates are repaired with twin CFRE doublers (case-1: like doublers, i.e., same material as substrate) and with aluminium alloy (AA) 2024-T3 doublers (case-2: unlike doublers, i.e., different material to substrate). Investigated joining techniques are pure riveting, pure bonding, and hybrid joint. Riveting is the most common technique in joining or repairing composite structures. This has the advantage of shorter installation time, but then composites are vulnerable to the high stress concentrations due to the rivet holes. Other techniques such as adhesive bonding and hybrid joining are relatively efficient, but installation is more time-consuming. Experiment results show, there is no significant difference in the average repair static strength between pure bonded and hybrid joints. Repairs with adhesively bonded composite doublers have highest average static strength (24.8 kN), whereas the lowest is observed for repairs with riveted metal doublers (5.5 kN). Standard deviation of specimens is significant for bonded joints but low for riveted and hybrid joints. Numerical analysis is complemented with experiments and the observed difference in the results is smaller than 1.5%.
dc.format.extent26 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Física
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica
dc.subject.lcshAluminum alloys
dc.subject.otherCarbon Fibre Reinforced Epoxy
dc.subject.otherAluminium alloy
dc.titleInvestigation on repairs of aircraft composite structures made with various joining techniques
dc.typeConference lecture
dc.subject.lemacAlumini -- Aliatges
dc.subject.lemacAeronaus -- Manteniment i reparació
dc.contributor.groupUniversitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
dc.contributor.groupUniversitat Politècnica de Catalunya. REMM - Recerca en Estructures i Mecànica de Materials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
upcommons.citation.authorPitta, S.; Roure, F.; Crespo, D.; Rojas, J.I.
upcommons.citation.contributorInternational Conference on Composite Structures
upcommons.citation.publicationNameICCS 21 - 21st International Conference on Composite Strcutures: Bologna, Italia: September 4-7, 2018: proceedings

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