Efficient optimization method for variable stiffness composite material plate shell structure

Abstract

The invention relates to composite material structure design in aerospace structures, and provides an efficient optimization method for a variable stiffness composite material plate shell structure. The method includes the steps: performing curve fiber path accurate modeling and buckling analysis on the variable stiffness composite material plate shell structure based on an isogeometric method; building an isogeometric buckling design model of the structure; deriving total analytical sensitivity of buckling response of the variable stiffness composite material plate shell structure; efficiently optimizing fiber paths of the variable stiffness composite material plate shell structure by a gradient-based method to obtain an optimal structure meeting process manufacturing constraints. According to the structure, the carrying efficiency of the variable stiffness composite material plate shell structure can be remarkably improved, and the development period of products is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of load-bearing structure design in aerospace structures, and relates to an efficient optimization method for a variable stiffness composite material plate shell structure. Background technique [0002] The lightweight of the load-bearing structure of the spacecraft can reduce the resources and energy consumption required to manufacture the structure, which will undoubtedly reduce the huge cost. Due to the high specific stiffness and specific strength, composite shell structures are becoming more and more common in the application of complex load-bearing structures in the modern aerospace industry. At present, fiber-reinforced composite laminates are mostly formed by laying parallel and straight fibers, and the angle of the fibers in the same layer is fixed. Considering the manufacturing process constraints, the lay-up directions of 0°, 90° and ±45° are often used in engineering. The lay-up fibers lack a ri...

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Problems solved by technology

[0005] The present invention mainly solves the technical problem of low efficiency in optimization design of the variable stiffness composite material plate and shell structure in the prior art, and proposes an efficient optimization method for the variable stiffness composite material plate and shell structure, so as to significantly improve the efficiency of the variable stiffness composite material plate and shell structure The purpose of carrying efficiency and greatly reducing the product development cycle

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