Simple finite element modeling method for composite stiffened skin-foam sandwich structure

Abstract

The invention discloses a simple finite element modeling method for a composite stiffened skin-foam sandwich structure. The method comprises the steps that 1, a three-dimensional entity model is established; 2, the three-dimensional entity model is partitioned to obtain a foam entity area and an interface; 3, a layer of shell area is established on the interface, composite properties are given to the shell area, and foam material properties are given to the foam entity area; 4, meshing is performed on the shell area and the foam entity area; 5, boundary conditions are set; and 6, submission is performed for calculation. The improved simple finite element modeling method for the composite stiffened skin-foam sandwich structure is proposed creatively, the modeling workload is greatly reduced, coupling calculation precision is effectively improved, and therefore the stress transmission effect and the strain transmission effect between finite element model nodes are improved.

Description

technical field [0001] The invention relates to the technical field of manufacturing a composite material reinforced skin-foam sandwich structure, and more specifically, the invention is a simple finite element modeling method for a composite material reinforced skin-foam sandwich structure. Background technique [0002] Compared with the traditional metal structure, the composite material reinforced skin-foam sandwich structure has higher specific stiffness and specific strength, the material strength can be fully utilized, and it has the advantages of excellent mechanical properties, so it is more and more widely used In the design of lightweight structure. [0003] In the design process of composite reinforced skin-foam sandwich structure, the conventional modeling method is: firstly, the composite reinforced skin finite element model and the foam finite element model are respectively established, and then the composite reinforced The element model is assembled with the ...

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Problems solved by technology

[0006] In order to solve the problems of poor coupling calculation accuracy, poor stress transfer effect between model nodes, poor strain transfer effect, and large modeling workload in the existing modeling method of composite material reinforced skin-foam sandwich structure, this paper The invention innovatively provides a simple finite element modeling method for composite material reinforced skin-foam sandwich structure, which ensures the one-to-one correspondence of nodes through solid model establishment, cutting, shell area and foam solid area establishment, avoiding the The conventional modeling method must calculate the average node problem, thereby solving the problems of poor coupling calculation accuracy, poor stress transfer effect between nodes, and poor strain transfer effect existing in the conventional modeling method; through the optimization and simplification of the modeling method and the construction The amount of model calculation is reduced, and the present invention also solves the problem of large modeling workload in conventional modeling methods

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