Stable Characteristics Optimization of Anti-Symmetric Cylindrical Shell with Laminated Carbon Fiber Composite

This paper proposes a multi-objective optimization model for anti-symmetric cylindrical shell in the bionic gripper structure. Here, the response surface method is used to establish multiple surrogate models of the anti-symmetric cylindrical shell, and the non-dominated sorting genetic algorithm-II (NSGA-II) is used to optimize the design space of the anti-symmetric cylindrical shell; the design points of the anti-symmetric cylindrical shell are verified by experimental methods. The optimization goals are that the first steady state transition load (the transition process of the bionic gripper structure from the open state to the closed state) of the anti-symmetric cylindrical shell is minimized, and the second steady state transition load (the transition process of the bionic gripper structure from the closed state to the open state) is the largest. At the same time, in order to prevent stable instability caused by stress concentration in the second steady state of the anti-symmetric cylindrical shell, the maximum principal plane stress is given as the constraint condition. The validity of the optimization results is verified by finite element and experimental methods. Due to the stable transition load of the anti-symmetric cylindrical shell being significantly larger than that of the orthogonal laminated plate, therefore, the anti-symmetric cylindrical shell has potential application prospects in the application of deformable structures and bionic structures that require composite functions such as having light weight, high strength, and large clamping force. The novelty of this paper lies in the multi-objective optimization of the application of the antisymmetric bistable cylindrical shell in the bionic gripper structure.

Automated summary

This paper proposes a multi-objective optimization model for an anti-symmetric cylindrical shell in a bionic gripper structure. It establishes multiple surrogate models using the response surface method and optimizes the design space using the non-dominated sorting genetic algorithm-II (NSGA-II). The design points are verified experimentally. The optimization aims to minimize the first steady state transition load and maximize the second steady state transition load, while preventing stable instability caused by stress concentration. The validity of the optimization results is verified through finite element and experimental methods. The anti-symmetric cylindrical shell shows potential application prospects in deformable structures and bionic structures due to its significantly larger stable transition load compared to orthogonal laminated plates.