Method for determining equivalent engineering constants in planes of compound materials in thickness direction

Abstract

A method for determining equivalent engineering constants in planes of compound materials in the thickness direction includes a first step of determining a three-dimensional stress-strain relation of compound material single layers under a structural overall coordinate system, a second step of determining a two-dimensional stress-strain relation of the compound material single layers in the planes based on the three-dimensional stress-strain relation of the compound material single layers under the structural overall coordinate system according to a plane strain hypothesis in the planes of the compound material single layers in the thickness direction, and a third step of determining the equivalent engineering constants in the planes of the compound material single layers in the thickness direction. The method determines the equivalent engineering constants in the planes of the compound materials in the thickness direction, and the equivalent engineering constants can be directly input into commercial finite element software to endow material properties on each compound material single layer, and the method can be used for building a two-dimensional finite element model of each compound material single layer to solve mechanical response of a compound material structure. The method is favorable for improving analysis precision of the compound material structure and remarkably reducing calculation scales and cost, and has important engineering application value.

Description

technical field [0001] The invention belongs to the technical field of composite material structure design and analysis, and is a method for determining equivalent engineering constants in a plane in the thickness direction of composite materials. The equivalent engineering constants can be directly input into finite element software to assign material properties to each composite material single layer , to establish a two-dimensional finite element model of each composite material single layer, so as to establish an overall two-dimensional finite element model of the composite material structure, and solve the mechanical response of the composite material structure in the plane of the thickness direction of the single layer, so as to significantly reduce the Scale and Cost of Structural Computational Analysis. Background technique [0002] Compared with traditional materials, composite materials have the advantages of high specific strength, high specific modulus, light wei...

AI Technical Summary

Problems solved by technology

However, since the engineering constants of a single layer of composite material given in engineering reflect the material properties of the single layer in the direction of the three coordinate axes of the positive axis coordinate system, and the general layup angle of the single layer of composite material is in the plane of its thickness direction The material properties of the material cannot be directly determined by the engineering constants given in the engineering, which greatly limits the application of the two-dimensional finite element analysis in solving the mechanical response of the composite material structure in the thickness direction of the single layer.

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