High-bearing-capacity lightweight design method for novel composite material structure

Abstract

The invention discloses a high-bearing-capacity lightweight design method for a novel composite material structure. According to the method, spatial correlation uncertainty of material attributes caused by a novel composite material structure preparation process is considered, and a material attribute random field model conforming to engineering practice is established; according to the design requirement for high bearing capacity and light weight, a novel composite material structure optimization design model under the influence of a random field is established, and then optimal novel composite material structure design parameters are rapidly obtained through a multi-target cuckoo search algorithm. In the optimization model solving process, firstly a Kriging enhanced artificial neural network agent model is established; random buckling analysis of the novel composite material structure is carried out through a random isogeometric analysis method based on an agent model; the average value of the critical buckling load and the maximum displacement of the buckling mode of the novel composite material structure under the influence of the random field can be quickly and accurately calculated, and therefore the optimal design scheme of the novel composite material structure, which meets the requirements of high bearing capacity and light weight, can be efficiently obtained.

Description

technical field [0001] The invention relates to the field of engineering, in particular to a novel composite material structure high bearing capacity lightweight design method. Background technique [0002] Composite materials have the advantages of light weight, high stiffness, and high strength, and their applications in engineering have become increasingly common in recent years. For example, structures with high strength and high rigidity performance requirements, such as hard rock roadheader cutterheads, are very suitable for use in composite materials. The engineering field is very concerned about the bearing capacity of structures in service, and the buckling analysis of composite structures is an important part of the design process of high bearing capacity of structures. Due to the complex preparation process of composite materials, their material properties have obvious randomness. This randomness makes the buckling behavior of new composite material structures ne...

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Problems solved by technology

[0003] Finite element analysis is a commonly used buckling analysis method, but when the traditional finite element analysis method converts the CAD model and the CAE model, the discrete operation of the grid unit will lose the geometric information of the CAD model, and the grid unit can only be approximated but cannot Accurately represent complex geometric shapes (such as sharp corners, complex surfaces, etc.), causing geometric discrete errors in the CAE model used for analysis

[0004] In the high bearing capacity design of composite material structures, the calculation of the statistical eigenvalues ​​of critical buckling loads of new composite material structures under the influence of random fields must be based on the calculation of random pre-buckling displacements. This is a double coupling problem of stochastic analysis. Embedded random Analytical methods are very difficult to solve, and it is difficult to derive explicit expressions for random critical buckling loads

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