Uncertainty assessment approach for composite structures based on global sensitivity indices

• Type: Article in International Scientific Journal
• Date: 2013

Authors

C. A. Conceição António (Author) FEUP; L. N. Hoffbauer (Author) Other

Journal

Title: Composite Structures

Vol. 99 No. May 2013

Pages: 202-212

ISSN: 0263-8223

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 27 Citations

INSPEC

Other information

Authenticus ID: P-005-1F4

DOI: 10.1016/j.compstruct.2012.12.001

Abstract (EN): The problem of uncertainty propagation in composite laminate structures is studied. An approach based on the optimal design of composite structures to achieve a target reliability level is proposed. Using the Uniform Design Method (UDM), a set of design points is generated over a design domain centred at mean values of random variables, aimed at studying the space variability. The most critical Tsai number, the structural reliability index and the sensitivities are obtained for each UDM design point, using the maximum load obtained from optimal design search. Using the UDM design points as input/output patterns, an Artificial Neural Network (ANN) is developed based on supervised evolutionary learning. Finally, using the developed ANN a Monte Carlo simulation procedure is implemented and the variability of the structural response based on global sensitivity analysis (GSA) is studied. The GSA is based on the first order Sobol indices and relative sensitivities. An appropriate GSA algorithm aiming to obtain Sobol indices is proposed. The most important sources of uncertainty are identified.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11