Method for determining ply angle direction and thickness of laminated board composite material

Abstract

The invention relates to a method for determining the ply angle direction and thickness of a laminated board composite material. The method comprises the following steps of: (1) establishing a laminated board composite material design model, converting discrete variable in the model into continuous variable, adding corresponding restraints and generating a plurality of particles according to a specific initialization scheme, wherein the coordinate value of each particle is a design scheme; (2) recording the initial coordinate value of each particle as an individual optimal scheme to further obtain a global optimal design scheme; (3) updating positions of the particles first by using a particle swarm design method, and carrying out different maximum-iterations mathematical programming designs according to different types of the particles; (4) obtaining a new potential design scheme of the laminated board composite material and updating the individual and global optimal design schemes; (5) judging whether convergence conditions are met, and if not, turning to the step (3); and (6) taking the ply thickness in the global optimal design scheme and the ply direction of the rounded laminated board composite material as a final design scheme of the laminated composite material.

Description

technical field [0001] The invention relates to the field of optimization design methods for composite materials, in particular to a method for determining the laying angle direction and thickness of laminate composite materials by combining particle swarm method and mathematical programming. Background technique [0002] Laminate composite materials are composed of high-strength, low-density fiber materials and matrix, which have higher specific strength and specific modulus than traditional materials, and have been widely used in aerospace, automotive and other industrial fields. However, due to the anisotropy of the laminate composite material, its performance is closely related to the ply angle and so on. When complex structures are subjected to complex loads, their corresponding structural design becomes more complicated than that of ordinary metal materials. Typical design variables for laminate composites are ply angle, ply thickness. Due to the limitations of the p...

AI Technical Summary

Problems solved by technology

[0011] Since the design method of laminate composites based on mathematical programming and the design method of particle swarm laminate composites will fall into the local optimal solution with different mechanisms and degrees, often these design solutions will bring a lot of waste of materials and bring certain discomfort. safety factor; therefore, it is difficult for the existing optimal design methods to find the optimal design scheme of laminate composites (such as the lightest weight, the largest buckling critical load, etc.) for complex laminate composite design problems, and even get a poor Design solution: Waste a lot of material even if the desired application and safety requirements are not met

Images