Damage tolerance design aircraft structures

Παππά, Ζωή; Pappa, Zoi

dc.contributor.author	Παππά, Ζωή	el
dc.contributor.author	Pappa, Zoi	en
dc.date.accessioned	2018-11-06T08:25:10Z
dc.date.available	2018-11-06T08:25:10Z
dc.date.issued	2018-11-06
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/47915
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.8151
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Συστήματα Αυτοματισμού”	el
dc.rights	Default License
dc.subject	Αεροναυπηγική	en
dc.subject	Βλάβες αεροποικών κατασκευών	el
dc.subject	Aeronautics	en
dc.subject	Design aircraft structures	en
dc.title	Damage tolerance design aircraft structures	en
heal.type	masterThesis
heal.secondaryTitle	Εφαρμογή στην ανοχή της βλάβης για τη μελέτη αεροπορικών κατασκευών	el
heal.classification	Aircraft structures	en
heal.classificationURI	http://skos.um.es/unesco6/330106
heal.language	en
heal.access	free
heal.recordProvider		el
heal.publicationDate	2018-10-05
heal.abstract	Damage tolerance design is becoming a mandatory part of the design of modern aircrafts, related to the any structure’s ability of sustaining the defects in an acceptable fail-safely level. A whole damage tolerance methodology has been developed during the last decades, specifically in aerospace engineering field, where the approach of designing is based both on the flaws existence and monitoring the extension of cracks. Principles of fracture mechanics are used recently in predicting residual strength and crack growth. Most commonly, the structure considered to be damage tolerant if a maintenance program has been implemented that will result in the detection and repair of accidental damage, corrosion and fatigue cracking before such damage reduces the residual strength of structure below the acceptable limit. The thesis consists of four main sections: The first section reviews the damage tolerant methodology, which based on crack propagation laws (including linear and non-linear ranges and spectrum loading effects) in fracture mechanics field, the residual strength principles and the life prediction methodology. The second part presents the damage characterization in accordance with several non-destructive methods and the analysis of cracking behavior under spectrum loading conditions and environmental conditions. The comparison of the test results and analysis verification tests provide data that define the accuracy of the damage tolerance analysis for predicting the crack growth behavior of the structure and control damage under operational conditions. This damage tolerance testing methodology and evaluation of material/quality/analysis and structural hardware tests data are represented in the third part of this paper. In latter part of this thesis, the structural elements of an aircraft are divided into two main categories as primary structural or secondary structure elements carrying flight/ground/pressurization loads or only air /inertial loads accordingly. Some examples of corrosion, cracks and damage growth incidents are also shown. Additionally, the experimental tests for the development of reinforced panels for the reduction of fatigue crack growth and the increase of residual strength of the aircraft skin as an attempt to improve their application to aircraft structures. This thesis is a general approach to critically review some damage tolerance design approaches and adopt the knowledge of stress concentration and crack propagation damage in aerostructures. Damage fail-safe control as a strong suggestion for the manufacturers of transport aircrafts to retain the large damage-tolerance capability designed into the first wide-bodied aircraft and to modify their methodology to establish inspection thresholds for those structures incapable of sustaining large obviously detectable damage	en
heal.advisorName	Μανωλάκος, Δημήτριος	el
heal.committeeMemberName	Μανωλάκος, Δημητριος Ε.	el
heal.committeeMemberName	Κουλοχέρης, Δημήτριος	el
heal.committeeMemberName	Μαρκόπουλος Άγγελος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Μηχανολόγων Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	154 σ.	el
heal.fullTextAvailability	true