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Design Methods for Composite Materials

A technology of composite materials and design methods, applied in calculation, special data processing applications, instruments, etc., can solve the problems of limited structural analysis efficiency and model accuracy, time-consuming and high cost, regardless of impact, etc., to achieve large degrees of freedom and Flexibility, large adaptability and solution capability, analyzing the effect of process economy

Active Publication Date: 2018-08-31
北京康姆特科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the existing composite material structure design, the commonly used method is: 1. The influence of process factors on the local fiber content change of the composite material structure is not considered; 2. In the structural analysis, according to the actual process layer parameters for each The units of the regional structure are defined accordingly; 3. The solid model is manufactured for precise calculation and testing
However, these methods have the following defects: For numerical analysis, the influence of process factors on the performance of composite materials is not considered, and a lot of preparatory work is required in structural analysis to ensure that the analysis model is consistent with reality, and the efficiency of structural analysis is greatly limited. and model accuracy, it is impossible to quickly obtain accurate analysis results
For experimental research, although reasonable design results can be obtained, the premise is that a physical model needs to be manufactured, which is time-consuming and expensive, and has poor flexibility

Method used

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  • Design Methods for Composite Materials
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Experimental program
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Embodiment approach

[0067] According to a specific embodiment of the present invention, said step a includes the following specific steps:

[0068] A1. Obtain the modulus of the resin matrix to be selected, and obtain the modulus and strength of the reinforcing fiber; and

[0069] A2. Estimate the modulus and strength of the composite material formed by combining different resin matrices and reinforcing fibers, and determine the optional composite method.

[0070] In the step A1 of the present invention, an example of the modulus of the resin matrix to be used is the modulus of the epoxy resin matrix, and examples of the modulus and strength of the reinforcing fibers are the modulus and strength of the carbon fibers. Furthermore, according to a preferred embodiment of the present invention, the modulus and strength of the resin matrix, such as the modulus and strength of epoxy resin, are obtained simultaneously.

[0071] In the step A2 of the present invention, the modulus and strength of the co...

specific Embodiment approach

[0078] According to a specific embodiment of the present invention, said step c includes the following specific steps:

[0079] C1. According to the distribution characteristics of the fibers in the cross section of the composite material, determine the periodic unit used to describe the fiber distribution inside the mesostructure, and the unit contains at least one fiber cross section;

[0080] C2, set up the first unit cell three-dimensional model (referring to described periodic unit) image 3 ), reflecting the fiber content in the representative composite material by adjusting the fiber diameter parameter, wherein the unit cell thickness is 1 / 5 to 1 / 2 of the fiber diameter; preferably 1 / 5 to 1 / 3; more preferably 1 / 5;

[0081] C3. Use finite element tools (such as ANSYS) to perform finite mesh division on the 3D model of the first unit cell, and apply periodic boundary conditions to the boundary nodes of the first unit cell relative to points, edges, and surfaces to make th...

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Abstract

The invention discloses a design method of composite material, comprising following steps: a, determining the mechanical property and composite mode of a resin substrate and reinforced fiber; b, determining the influence range of a technological factor on the fiber content of the composite material; c, using a homogenization numerical method to calculate the engineering elastic constant of a single layer of the composite material microcosmically; d, obtaining the engineering elastic constant of the laminating structure of the composite material macroscopically basing on the engineering elastic constant of the single layer of the composite material obtained in the step c; e, obtaining the bearing capacity of the composite material basing on the engineering elastic constant of the laminating structure obtained in the step d, and step f, judging whether the bearing capacity of the composite material obtained in the step e is accord with a design demand, and determining the optimum technological factor and structure parameter of the composite material. The method takes adequate consideration of influence of the material component and the technological factor variation on the bearing capacity of the composite material, shortens the design cycle and reduces the cost.

Description

technical field [0001] The invention relates to the field of composite material structure design, in particular to an optimal design method of composite material structure. Background technique [0002] Composite materials are the materials of choice for lightweight industrial products, and their excellent properties of light weight, high strength, corrosion resistance, and fatigue resistance are closely related to their internal mesostructure. In many fields of composite material product development and application, composite material structure design occupies an extremely important position. Especially in industries such as aerospace, transportation, petrochemical and environmental protection and anticorrosion, it plays a pivotal role. The unique material-structure-function integration characteristics of composite materials, especially the sensitivity of process, determine that its structural design requires more comprehensive structural design technology and design theor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 黄其忠胡照会彭玉刚王鹏飞高红成王丹
Owner 北京康姆特科技发展有限公司