A robustness-based design strategy for composite structures – probabilistic approach

Abstract

Purpose

The purpose of this paper is to present the probabilistic approach to a new robustness-based design strategy for thin-walled composite structures in post-buckling.

Design/methodology/approach

Because inherent uncertainties in geometry, material properties, ply orientation and thickness affect the structural performance and robustness, these variations are taken into account.

Findings

The methodology is demonstrated for the sake of simplicity with an unstiffened composite plate under compressive loading, and the probabilistic and deterministic results are compared. In this context, the structural energy and uncertainties are employed to investigate the robustness and reliability of thin-walled composite structures in post-buckling.

Practical implications

As practical implication, the methodology can be extended to stiffened shells, widely used in aerospace design with the aim to satisfy weight, strength and robustness requirements. Moreover, a new argument is strengthened to accept the collapse close to ultimate load once robustness is ensured with a required reliability.

Originality/value

This innovative strategy embedded in a probabilistic framework might lead to a different design selection when compared to a deterministic approach, or an approach that only accounts for the ultimate load. Moreover, robustness measures are redefined in the context of a probabilistic design.

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 – probabilistic approach", Aircraft Engineering and Aerospace Technology, Vol. 86 No. 4, pp. 262-273. https://doi.org/10.1108/AEAT-04-2013-0071