Composite bistable shell structure optimization design method based on full-factor test

Abstract

The invention relates to a composite bistable shell structure optimization design method based on a full-factor test. The method comprises the following steps: (1) establishing a geometric model of acomposite bistable shell structure; (2) establishing a finite element model of the composite bistable shell structure; (3) performing nonlinear finite element analysis based on Abaqus software to obtain strain energy and a stress value of the composite bistable shell structure; (4) establishing an optimization model taking the strain energy of the composite bistable shell structure in the second stable state as a target by taking the cross section radius and the layering angle of the composite bistable shell structure as design variables; (5) employing a response surface method to solve the optimization design problem, selecting sample points in a parameter design space through a full-factor test design method, achieving display of a target function and a constraint function, and checkingthe accuracy of a fitting function; and (6) solving by adopting a sequential quadratic programming algorithm to obtain an optimal result. The method is applied to a composite material bistable state shell structure in the aspect of a space expansion structure.

Description

technical field [0001] The invention relates to the selection of the optimal size of the bistable shell structure of composite materials, and is suitable for novel space-deformable intelligent structures. Background technique [0002] With the development of composite materials, a new type of advanced spatially deformable composite structure—composite bistable shell structure has attracted extensive attention from scholars at home and abroad, and has been widely used in deployable structures, deformable wings and Intelligent structures such as energy absorbing devices. The bistable composite shell structure is a composite material structure that has two different stable state characteristics and can realize transition between different stable states under certain driving conditions (mechanical drive, smart material drive, etc.). According to the laying method of the laminates, the bistable composite shell structure is mainly divided into asymmetric orthogonal laying and ant...

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Problems solved by technology

[0003] At present, the research time on the bistable shell structure of anti-symmetric laminated composite materials is relatively short, and the research on theoretical models lacks sufficient data verification and analysis, which limits the development of shell structures in practical applications.

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