Journal
COMPOSITE STRUCTURES
Volume 327, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2023.117698
Keywords
Composite laminates; Stiffened composite laminate; Stacking sequence optimization; Stiffener layout optimization; Spectral element method; Index-based optimization
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In this study, a novel optimization framework was proposed, which combines a highly accurate and computationally efficient spectral element modeling technique with an index-based optimization approach that satisfies manufacturing guidelines and empirical rules. The accuracy and computational performance of the proposed framework were demonstrated in composite laminates, and its capability and efficiency were shown in various stiffened composites.
Stiffened composite panels are increasingly used in aerospace, marine, and automotive industries due to their lightweight and high-strength properties. However, determining the optimal stacking sequence and/or layout of stiffeners concurrently while adhering to manufacturing guidelines and empirical rules is challenging. To address this issue, we propose a novel one-step optimization framework that couples a highly accurate and computationally efficient spectral element modeling technique with an index-based optimization approach that inherently satisfies the manufacturing guideline and empirical rules. Spectral element modeling (SEM) combines the high accuracy of spectral (meshless) methods with the geometric flexibility of finite element methods. To determine the optimal design, an index-based optimization is proposed to decrease the number of design variables and remove the constraints. We demonstrated the accuracy and computational performance of SEM with results obtained by finite element analysis on composite laminates with and without a cutout. Finally, we applied the proposed optimization framework to various stiffened composite (balanced and symmetric) laminates of up to 200 plies to demonstrate its capability and efficiency.
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