elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Robustness Assessment of Stiffened Thin-Walled Composite Structures in Post-Buckling

da Cunha, Fabio and Wille, Tobias and Degenhardt, Richard and Sinapius, Michael and Araujo, Francisco Celio (2013) Robustness Assessment of Stiffened Thin-Walled Composite Structures in Post-Buckling. 17th International Conference on Composite Structures (ICCS17), 17.-21.June 2013, Porto, Portugal.

[img] PDF
11kB

Abstract

This work presents the robustness assessment of stiffened thin-walled composite structures in post-buckling, which is based on a new design strategy that satisfies weight, load-based performance and energy-based robustness requirements. In this approach, robustness is understood as collapse insensitivity due a local failure, where global buckling for instance is assumed as a local failure, once the stiffness reduction after this event can lead to a sharp collapse. Following this concept, robustness measures are derived from the structural energy, the area under the load-shortening curve obtained from geometrical nonlinear finite element analysis with material progressive failure. Since inherent uncertainties in geometry, material properties, ply orientation and thickness affect the structural performance and robustness, those variations are accounted for. As a result, a new argument is given to shift collapse closer to ultimate load, so that lighter structures are achievable with both performance and robustness requirements satisfied. This trade-off is valuable to aerospace applications, where light weight and safety are mandatory. Finally, this innovative strategy is demonstrated for stiffened thin-walled composite structures in post-buckling, and its results compared to others obtained from current practice.

Item URL in elib:https://elib.dlr.de/83854/
Document Type:Conference or Workshop Item (Speech)
Title:Robustness Assessment of Stiffened Thin-Walled Composite Structures in Post-Buckling
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
da Cunha, FabioUNSPECIFIEDUNSPECIFIED
Wille, TobiasUNSPECIFIEDUNSPECIFIED
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Sinapius, MichaelUNSPECIFIEDUNSPECIFIED
Araujo, Francisco CelioUniversidade Federal de Ouro PretoUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:robustness, stiffened thin-walled composite structures, post-buckling
Event Title:17th International Conference on Composite Structures (ICCS17)
Event Location:Porto, Portugal
Event Type:international Conference
Event Dates:17.-21.June 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Degenhardt, Richard
Deposited On:18 Sep 2013 14:28
Last Modified:31 Jul 2019 19:41

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.