A numerical stochastic strategy for optimising composite elastic shells undergoing buckling is presented. Its scope is to search for the best stacking sequence that maximises the collapse load considering the post-buckling behaviour. Its feasibility is due to a reduced order model built for each material setup starting from a hybrid solid-shell finite element model exploiting a multimodal Koiter method. The approach has no limitations concerning geometry, boundary conditions and material properties distribution. The collapse load is evaluated using a Monte Carlo simulation able to detect the worst imperfection shape, including a posteriori the imperfections in the reduced order model. For a limited number of parameters the proposal allows to analyse all the possible layups. In the general case, it uses a Monte Carlo scanning of the design parameters with different levels of adaptability. The optimisation of curved panels, also with stiffeners, confirms the feasibility and reliability of the proposed strategy.

Post-buckling optimisation strategy of imperfection sensitive composite shells using Koiter method and Monte Carlo simulation

Liguori, Francesco S.
;
Madeo, Antonio
Conceptualization
;
Magisano, Domenico
Membro del Collaboration Group
;
Leonetti, Leonardo
Membro del Collaboration Group
;
Garcea, Giovanni
Conceptualization
2018

Abstract

A numerical stochastic strategy for optimising composite elastic shells undergoing buckling is presented. Its scope is to search for the best stacking sequence that maximises the collapse load considering the post-buckling behaviour. Its feasibility is due to a reduced order model built for each material setup starting from a hybrid solid-shell finite element model exploiting a multimodal Koiter method. The approach has no limitations concerning geometry, boundary conditions and material properties distribution. The collapse load is evaluated using a Monte Carlo simulation able to detect the worst imperfection shape, including a posteriori the imperfections in the reduced order model. For a limited number of parameters the proposal allows to analyse all the possible layups. In the general case, it uses a Monte Carlo scanning of the design parameters with different levels of adaptability. The optimisation of curved panels, also with stiffeners, confirms the feasibility and reliability of the proposed strategy.
Composite shells; Finite element analysis; Imperfection sensitivity; Post-buckling optimisation; Ceramics and Composites; Civil and Structural Engineering
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Descrizione: The publisher version is available at https://www.sciencedirect.com/science/article/abs/pii/S0263822317339776; DOI: 10.1016/j.compstruct.2018.03.023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/283010
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