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.
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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/ | ||||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||
Title: | Robustness Assessment of Stiffened Thin-Walled Composite Structures in Post-Buckling | ||||||||||||||||||
Authors: |
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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 Transportation | ||||||||||||||||||
DLR - Research area: | Raumfahrt | ||||||||||||||||||
DLR - Program: | R RP - Space Transportation | ||||||||||||||||||
DLR - Research theme (Project): | R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation (old) | ||||||||||||||||||
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 |
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