A substructure-based elastic parameter identification method for composite materials

Abstract

The invention provides a composite material elastic parameter identification method based on a substructure, establishes a composite material substructure finite element model, and carries out dynamicpolycondensation on the composite material substructure model according to the substructure theory; after the substructure eigenmatrix is assembled on the residual structure, the modal information ofthe whole composite model is obtained. The relative sensitivity of the modal frequency to the elastic parameters of the residual structure is calculated by extracting the modal data of the whole model. The objective function is minimized by iterative optimization algorithm with the two norm of modal frequency residuals of experiment and finite element simulation as the objective function. By considering the composite material modeling of the sub-structure, the model to be identified is defined as a residual structure. By means of modal frequency sensitivity analysis and modal mode matching, the parameters to be identified of composite materials are identified by optimization iterative algorithm, which saves computational resources and improves computational efficiency. It has very important engineering significance.

Description

technical field [0001] The invention relates to a composite material, in particular to a method for identifying parameters of the composite material. Background technique [0002] Composite materials are usually composed of two or more different materials, and composite materials are generally anisotropic. Because of their high specific strength, high specific modulus, and strong designability, they are widely used in aviation Aerospace, civil engineering, mechanical engineering and other fields. In order to meet the requirements of engineering structure design, it is necessary to give accurate information on the material parameters of composite materials. However, due to the influence of the manufacturing process and the manufacturing environment, the performance of the finished composite material is quite different from the theoretical performance, and it is necessary to identify its elastic parameters. Design provides basic information. [0003] In the traditional compo...

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Problems solved by technology

[0003] In the traditional composite material parameter identification process, only the unknown part of the material parameters in the overall structure needs to be analyzed, and the identification efficiency of the overall structure parameters is low, resulting in waste of resources

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