elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Robust design of composite cylindrical shells under axial compression — Simulation and validation

Hühne, Christian und Rolfes, Raimund und Breitbach, Elmar und Teßmer, Jan (2007) Robust design of composite cylindrical shells under axial compression — Simulation and validation. Thin-Walled Structures, 86 (7-9), Seiten 947-962. Elsevier Ltd.. DOI: doi:10.1016/j.tws.2008.01.043.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

Thin-walled shell structures like circular cylindrical shells are prone to buckling. Imperfections, which are defined as deviations from perfect shape and perfect loading distributions, can reduce the buckling load drastically compared to that of the perfect shell. Design criteria monographs like NASA-SP 8007 recommend that the buckling load of the perfect shell shall be reduced by using a knock-down factor. The existing knock-down factors are very conservative and do not account for the structural behaviour of composite shells. To determine an improved knock-down factor, several authors consider realistic shapes of shells in numerical simulations using probabilistic methods. Each manufacturing process causes a specific imperfection pattern; hence for this probabilistic approach a large number of test data is needed, which is often not available. Motivated by this lack of data, a new deterministic approach is presented for determining the lower bound of the buckling load of thin-walled cylindrical composite shells, which is derived from phenomenological test data. For the present test series, a single pre-buckle is induced by a radial perturbation load, before the axial displacement controlled loading starts. The deformations are measured using the prototype of a high-speed optical measurement system with a frequency up to 3680 Hz. The observed structural behaviour leads to a new reasonable lower bound of the buckling load. Based on test results, the numerical model is validated and the shell design is optimized by virtual testing. The results of test and numerical analysis indicate that this new approach has the potential to provide an improved and less conservative shell design in order to reduce weight and cost of thin-walled shell structures made from composite material.

Dokumentart:Zeitschriftenbeitrag
Titel:Robust design of composite cylindrical shells under axial compression — Simulation and validation
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hühne, ChristianInstitute for Structural Analysis, Leibniz University of Hannover, Germany
Rolfes, RaimundInstitute for Structural Analysis, Leibniz University of Hannover, Germany
Breitbach, ElmarNICHT SPEZIFIZIERT
Teßmer, JanNICHT SPEZIFIZIERT
Datum:2007
Erschienen in:Thin-Walled Structures
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:86
DOI :doi:10.1016/j.tws.2008.01.043
Seitenbereich:Seiten 947-962
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Loughlan, JosephNICHT SPEZIFIZIERT
Verlag:Elsevier Ltd.
Status:veröffentlicht
Stichwörter:Composite shells; Stability; Buckling; Robust design; Imperfection sensitivity
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Strukturen & Werkstoffe
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Strukturmechanik
Hinterlegt von: Doris Ries
Hinterlegt am:08 Sep 2008
Letzte Änderung:15 Jan 2010 00:00

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.