Reliability-based topology optimization and engineering design of stiffened plates

For the three-dimensional stiffened plate，a non-nested reliability based topology optimization is proposed in order to achieve lightweight and engineering design while ensuring its safety and reliability. And the reliability concept-detailed combination optimization design is carried out for three-dimensional engineering stiffened plates. By virtue of the decoupling characteristics of the sequential optimization and reliability assessment method external optimization software with variable density method as the core was applied to carry out deterministic topology optimization to improve optimization efficiency. And considering the randomness of loads and materials，the hybrid mean value method was used to search the most probable point in the reliability evaluation stage. Furthermore，the layout of reliability conceptual design was interpreted and the size optimization was carried out to realize the engineering application. The result shows that compared with the deterministic topology optimization，the reliability topology optimization proposed in this paper can meet the requirements of structural reliability and lightweight. The combination optimization strategy of conceptual design and detailed design has realized that the engineering stiffened plate can reduce the material cost by 21.40% while simplifying the layout and ensuring the performance. © 2024 Editorial Board of Jilin University. All rights reserved.