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

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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

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Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα Except where otherwise noted, this item's license is described as Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα