Barile, Marco (2016) Expedient Repair of a Battle-Damaged Composite Fixed-Wing Aircraft. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Lingua: English
Title: Expedient Repair of a Battle-Damaged Composite Fixed-Wing Aircraft
Date: 31 March 2016
Number of Pages: 100
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Industriale
Scuola di dottorato: Ingegneria industriale
Dottorato: Ingegneria aerospaziale, navale e della qualità
Ciclo di dottorato: 28
Coordinatore del Corso di dottorato:
De Luca,
Lecce, LeonardoUNSPECIFIED
Date: 31 March 2016
Number of Pages: 100
Uncontrolled Keywords: ABDR, Scarf Repair, Composite Structures
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/04 - Costruzioni e strutture aerospaziali
Date Deposited: 11 Apr 2016 09:40
Last Modified: 31 Oct 2016 10:04


The present work, based on a numerical-experimental approach, was aimed to assess the effectiveness of Expedient Repair (ER) concepts in case of a fixed-wing composite aircraft, subjected to battle-field damage represented by a large and challenging damage condition that required a structural repair. The activity was carried out within the research project called "COMPRIP", a contract between the Department of Industrial Engineering - Aerospace Section and Italian Ministry of Defense - Segretariato Generale della Difesa e Direzione Nazionale Armamenti - Direzione degli Armamenti Aeronautici e per l’Aeronavigabilità - Ufficio Tecnico Territoriale di Napoli. All activities were carried out following decisions agreed in the frame of "Aircraft Expedient Repair" Program by a Consortium including experts coming from Armed Forces of US, Germany, France and Italy. The objective of AER Project is to develop and exchange aircraft ER techniques, procedures, and methodologies that will enhance the ER capabilities of the contributing participants individually and collectively, thus improving operational aircraft performance through restoring full operational capability of composite structures while reducing repair costs. Thesis work started with an extensive review of literature on the type of damages and conventional/unconventional repair procedures of aircraft composite structures. Then, several FE investigations on bonded repairs were performed to define suitable guidelines to use in the design of the expedient repair. After this phase, a set of structural demonstrators were identified, redesigned and manufactured using RTM process. A versatile predictive model applicable to the design of repairs both for conventional (as reported in the SRM) and unconventional damages, was developed and implemented with the aim to investigate stress and strain concentration, the failure initiation and failure progression mechanisms of involved composite structures. Once the repair scenario was identified by the Consortium of AER Project, the assessment involved a relative comparison of four FE models, representing pristine, damaged with simulated ballistic damage and repaired with a condition of full and a limited accessibility to the damaged composite structure. In case of the full access condition, a scarf repair based on adhesives and filler composite patch was taken into account, while for the limited access condition, a coupling of bonded patch and bolted substantiation was developed. Since French partner of AER Project will perform physical loading tests, the repair with limited access to the damaged part was executed. Numerical results have successfully shown that a battle-damaged aircraft,can continue to fly after the ER, up the next scheduled maintenance, but with some limitations (i.e. limitation in maneuver and maximum speed).


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