Method for multiscale calculation of equivalent stiffness matrixes of complex composite material structures

A composite material, equivalent stiffness technology, applied in the direction of calculation, design optimization/simulation, special data processing applications, etc., can solve the problems affecting the macroscopic material properties, restricting the application in engineering fields, and the software is not open to the public, and achieves good accuracy, Good applicability and the effect of promoting application

Inactive Publication Date: 2017-12-08
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0007] However, the existing multi-scale methods only consider two-scale information. Since most composite materials are in the form of plies, the mesoscale of the material is not a simple combination of fibers and matrix, but a combination of multiple fibers and matrix. The ply angle of the fiber and the arrangement of each fiber will greatly affect the performa...

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  • Method for multiscale calculation of equivalent stiffness matrixes of complex composite material structures
  • Method for multiscale calculation of equivalent stiffness matrixes of complex composite material structures
  • Method for multiscale calculation of equivalent stiffness matrixes of complex composite material structures

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Embodiment Construction

[0048]Embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0049] This embodiment takes the calculation of the equivalent stiffness matrix of a certain type of pressure vessel as an example, implements it according to the technical solution of the present invention, and gives a detailed implementation process.

[0050] Step 1: The pressure vessel is made of carbon / carbon composite materials, and the prefabricated body of the mesoscopic structure is composed of no weft cloth, ±45° lay-up, 0°, and 90° lay-up. According to the actual size of the example, such as figure 2 with image 3 As shown, the cylinder is 20mm long. The macroscopic finite element analysis model of the pressure vessel is established in the commercial finite element software ABAQUS, and the material coordinate system of the macroscopic finite elemen...

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Abstract

The invention discloses a method for multiscale calculation of equivalent stiffness matrixes of complex composite material structures. The method comprises the following steps of: separating a macro-meso-micro three-scale structure by adoption of a scale separation method, and respectively establishing each scale analysis model according to geometric features of different scale models; and converting a three-scale problem into two multiscale problems: a macro-meso multiscale problem and a meso-micro multiscale problem, analyzing the two multiscale problems in sequence, and finally returning an equivalent modulus obtained by a micro multiscale problem to a macro multiscale problem. According to the method, the disadvantages such as low calculation efficiency and bad precision of the traditional structure analysis are overcome and the efficiency and precision of predicting performance of composite material structures are effectively enhanced; and the method can be used for instructing the work such as production, research and development of composite materials. The method can be applied to design and analysis of complex composite material structures in the field of aerospace, and can be applied to thermal and mechanical analysis problems of structure design in the engineering field of other composite materials.

Description

technical field [0001] The invention relates to the field of composite material design, and relates to a complex composite material structure analysis and design method, specifically a multi-scale method for calculating the equivalent stiffness matrix of complex composite material structures. Background technique [0002] Due to the characteristics of light weight, high strength and strong designability, composite materials are widely used in aerospace structural devices. Due to the complex structure of composite materials, in order to study the performance of composite materials and improve the use efficiency of composite structural parts, scholars at home and abroad have proposed a large number of theories to predict the behavior of composite materials in the past century. Its core is to determine the distribution of physical quantities such as displacement and temperature inside the structure by solving the governing equations, so as to complete the prediction of material...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 张锐文立华汤泽炜卢颖
Owner NORTHWESTERN POLYTECHNICAL UNIV
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