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Efficient strategies for reliability-based design optimization of variable stiffness composite structures

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Abstract

This study investigates efficient design optimization frameworks for composite structures with uncertainties related to material properties and loading. The integration of two decoupled reliability-based design optimization methodologies with a decoupled discrete material optimization is proposed to determine material and fiber orientation for three-dimensional composite structures. First, a deterministic and decoupled discrete material optimization is used for baseline comparison. The objective is to minimize the cost of composite structures with the design variables comprising of the piecewise patch orientations and material properties of the fiber reinforced composites. The reliability-based design optimization includes a hybrid method, and also the sequential optimization and reliability assessment method. In the sequential optimization and reliability assessment method, the inverse reliability analysis is evaluated using a stochastic response surface method and a first order reliability approach. Comparing the methods based on the optimal material and fiber orientations, the uncertainties in loads and material properties lead to different optimal layouts compared to the deterministic solutions. The numerical results also reveal that the hybrid method applied in reliability based designs results in negligible additional computational cost.

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Acknowledgements

The authors would like to acknowledge the Graduate Fellowship from the Fundação para a Ciencia e Tecnologia through the MIT-Portugal program and the NSERC Canada Research Chair and Discovery Programs.

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Authors and Affiliations

  1. MIT-Portugal Program, IDMEC-CCTAE, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal

    A. Sohouli & A. Suleman

  2. Faculty of Engineering and Natural Sciences, Advanced Composites & Polymer Processing Laboratory, Sabanci University, Orhanli-Tuzla, 34956, Istanbul, Turkey

    M. Yildiz

  3. Department of Mechanical Engineering, University of Victoria, Victoria, BC, Canada

    A. Suleman

  4. Istanbul Technology Development Zone, Sanayi Mah, Sabanci University-Kordsa, Composite Technologies Center of Excellence, Teknopark Blvd. No: 1/1B, Pendik, 34906, Istanbul, Turkey

    M. Yildiz

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  1. A. Sohouli
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Correspondence to A. Suleman.

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Sohouli, A., Yildiz, M. & Suleman, A. Efficient strategies for reliability-based design optimization of variable stiffness composite structures. Struct Multidisc Optim 57, 689–704 (2018). https://doi.org/10.1007/s00158-017-1771-8

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  • DOI: https://doi.org/10.1007/s00158-017-1771-8

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