A robustness-based design strategy for composite structures
Abstract
Purpose
This paper aims to present a new robustness-based design strategy for thin-walled composite structures under compressive loading, which combines strength requirements in terms of the limit and ultimate load with robustness requirements evaluated from the structural energy until collapse.
Design/methodology/approach
In order to assess the structural energy, the area under the load-shortening curve between several characteristic points such as local buckling, global buckling, onset of degradation and collapse load is calculated. In this context, a geometrically nonlinear finite element analysis is carried out, in which the ply properties are selectively degraded by progressive failure.
Findings
The advantage of the proposed methodology is observed by analyzing unstiffened composite plates under compressive loading, wherein the lightest plate that satisfies both strength and robustness requirements can be attained.
Practical implications
As a practical implication, this methodology gives a new argument to accept the collapse load close to the ultimate load once robustness is ensured.
Originality value
The structural energy is employed to investigate the robustness of thin-walled composite structures in postbuckling, and new energy-based robustness measures are proposed. In the design of composite structures, this innovative strategy might lead to a more robust design when compared to an approach that only accounts for the ultimate load.
Keywords
Acknowledgements
Fabio Riberio Soares da Cunha acknowledges CNPq (Brazilian National Council for Scientific and Technological Development) by granting the scholarship, Embraer S.A. for support and assistance and DLR (German Aerospace Center) for funding the research. The information in this paper is provided and no warranty is given that the information is fit for any particular purpose. The reader thereof uses the information at its sole risk and liability.
Citation
Ribeiro Soares da Cunha, F., Wille, T., Degenhardt, R., Sinapius, M., Célio de Araújo, F. and Zimmermann, R. (2014), "A robustness-based design strategy for composite structures", Aircraft Engineering and Aerospace Technology, Vol. 86 No. 4, pp. 274-286. https://doi.org/10.1108/AEAT-04-2013-0070
Publisher
:Emerald Group Publishing Limited
Copyright © 2014, Emerald Group Publishing Limited