Abstract
To improve the buckling resistance, a variable stiffness (VS) layup optimization strategy is proposed by considering the constraints of manufacturing process. By considering the curvature constraints of fiber-tow paths during the fabrication of VS laminates, the constrained Kriging model is bult to relate the design variable of layup configuration with the buckling resistance. The first eigenvalue obtained from the eigenvalue buckling analyzing is set as the objective function, and used to establish the constrained Kriging model. With the help of the multi-island genetic algorithm (MIGA), the global optimal solution is searched, and the influence of VS layups on buckling of composite laminates is analyzed. Taking a uniaxial compressive buckling case for example, an optimized layup configuration has been obtained. By investigating the effectiveness of the optimization strategies, buckling characteristics of four laminates with different layup configurations have been simulated by nonlinear buckling analyzing, and have been proved by the compressive buckling tests. By comparing the buckling responses of the analytical model and the experimental results, it can be found the laminate with optimized layup configuration has a much better buckling resistance ability. Compared with traditional constant stiffness (CS) laminate, the buckling stiffness and ultimate load have been improved by 41.1% and 113.58%, respectively.
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This study was supported by National Natural Science Foundation of PR China grant no. 52175110.
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Niu, X., Zhang, X. Curvature-Constrained Layup Optimization to Improve Buckling Resistance of Composite Laminates. Mech. Solids 57, 1500–1511 (2022). https://doi.org/10.3103/S0025654422060103
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DOI: https://doi.org/10.3103/S0025654422060103