Crashworthiness behavior of thin-walled aluminium square tubes under oblique impact

Karantza, Konstantina; Καραντζά, Κωνσταντίνα

dc.contributor.author	Karantza, Konstantina	en
dc.contributor.author	Καραντζά, Κωνσταντίνα	el
dc.date.accessioned	2023-01-09T10:56:18Z
dc.date.available	2023-01-09T10:56:18Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/56560
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.24258
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Επιστήμη και Τεχνολογία Υλικών”	el
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Crashworthiness	en
dc.subject	Oblique collapse	en
dc.subject	Thin-walled tubes	en
dc.subject	Aluminium square tubes	en
dc.subject	LS-DYNA	en
dc.subject	Κρουστική καταπόνηση	el
dc.subject	Λοξή κατάρρευση	el
dc.subject	Λεπτότοιχοι σωλήνες	el
dc.subject	Τετραγωνικοί σωλήνες αλουμινίου	el
dc.title	Crashworthiness behavior of thin-walled aluminium square tubes under oblique impact	en
heal.type	masterThesis
heal.secondaryTitle	Ικανότητα απορρόφησης ενέργειας τετραγωνικών σωλήνων αλουμινίου έναντι λοξής φόρτισης	el
heal.classification	Mechanical engineering	en
heal.classification	Crashworthiness	en
heal.classification	Crushing mechanics	en
heal.classification	Μηχανολογία	el
heal.classification	Κρουστική καταπόνηση	el
heal.classification	Μηχανική των κρούσεων	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2022-10-25
heal.abstract	The aim of current master thesis is to investigate the crushing behavior of thin-walled aluminium AA6060-T6 square tubes subjected to both axial and oblique loading in order to evaluate their crashworthiness efficiency and energy absorption capacity. A parametric analysis in loading angle lying up to 15o and in initial type of contact between impactor and tube are examined in order to assess their effect on plastic collapse initiation and energy absorption. The examined initial contact types contain a contact-in-edge case and a contact-in-corner one between impactor and tube regarding the oblique loading scenarios. In order to evaluate the energy absorption capability and the characteristics of the occurred collapse mechanism, both experimental tests and numerical finite element simulations are carried out providing the force-displacement curve and the main crashworthiness response parameters, while further different collapse states are captured during plastic deformation. At first, the experimental compression tests are conducted in quasi-static conditions under a constant loading rate of 10 mm/min by adjusting properly the loading angle representing off-axis oblique crushing conditions. For each examined case, two compression tests are carried out in order to secure the reliability of experimental results. At next, numerical simulation are carried out in LS DYNA software by developing the finite element models for each examined case. The numerical simulations consider dynamic conditions by adjusting a crushing speed of 1 m/s. The square tubes are modelled via 4-node shell elements, while at each examined configuration the bottom tube end was considered as fixedly supported. The experimental and the numerical results were firstly compared between each other to validate the created finite element models, while also both were taken into account in order to evaluate the crashworthiness performance and assess the loading angle and initial type of contact effects on crushing efficiency. Both experiments and simulations showed a sufficient agreement in both plastic collapse mechanism and crashworthiness response parameters. All examined cases revealed an inextensional collapse mode, while slight tearing occurred around tube corners. The tearing effect seemed stronger at lower loading angles compared to the one of crushing angle, while in contrast the crushing angle effect revealed greater magnitude at higher loading angles. The increase in loading angle resulted in energy absorption decrease and lower peak crushing force which however flattened out at high angles. Cornered oblique loading revealed greater peak force and energy absorption at all loading angles compared to edged oblique loading. Finally, 5o cornered oblique crushing was proved as the most beneficial revealing the greatest energy absorption capacity.	en
heal.advisorName	Manolakos, Dimitrios	en
heal.advisorName	Μανωλάκος, Δημήτριος	el
heal.committeeMemberName	Κόλλια, Κωνσταντίνα	el
heal.committeeMemberName	Μαρκόπουλος, Άγγελος	el
heal.committeeMemberName	Μανωλάκος, Δημήτριος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Χημικών Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	161 σ.	el
heal.fullTextAvailability	false