ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Structure optimization of variable-stiffness composite shells and buckling in thermal environments
Received date: 2025-06-26
Revised date: 2025-07-28
Accepted date: 2025-09-03
Online published: 2025-09-10
Supported by
National Natural Science Foundation of China(12472202);Open Project Program of National Key Laboratory of Strength and Structural Integrity(LSSIKFJJ202403014)
Variable-Stiffness （VS） composites have gained significant attention due to their tunable stiffness and strength properties. The instability issues of VS thin-walled structures in thermal environments cannot be ignored. The thermal buckling performance and geometric imperfection sensitivity of laminated plate and cylindrical shell structures with straight layups and manufacturable optimal curved fiber layups under different thermal environments are investigated. First， the optimal layup angles considering the minimum radius of curvature are obtained using an optimization algorithm based on a variable-fidelity Kriging surrogate model. Second， the thermal buckling problems of VS laminated plates and cylindrical shells are studied through static analysis and nonlinear buckling analysis considering thermal environments and initial imperfections. Comparisons are conducted between straight and curved fiber layup laminated plates and VS cylindrical shell considering their imperfection sensitivities. The results show that the linear buckling loads of the optimized VS structures are all greater than those of the straight layup laminated plates. Thermal stress leads to a reduction in the total instability load of VS laminated plates， while having a smaller impact on conventional straight layup laminated plates； for VS cylindrical shell structures， the total buckling load value increases slightly under thermal stress. Temperature has a minor effect on the imperfection sensitivity of laminated plates， while for cylindrical shell structures， temperature increases their compressive imperfection sensitivity.
Yuheng SUN , Yujie GUO , Shijie XIAO , Huiwen CUI , Hao YAN , Xiaohui WEI . Structure optimization of variable-stiffness composite shells and buckling in thermal environments[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2026 , 47(6) : 232473 -232473 . DOI: 10.7527/S1000-6893.2025.32473
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