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Composite material elastic property variability identification method based on strain full-field measurement

A technology of elastic properties and composite materials, applied in the direction of testing composite materials, measuring devices, analyzing materials, etc., can solve the problems of high requirements for test methods and modeling simulation, and achieve the effect of low requirements and material reduction

Active Publication Date: 2017-03-22
HARBIN INST OF TECH
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Problems solved by technology

By reconstructing multiple virtual samples, the fluctuation of macroscopic material properties can also be obtained by using the homogenization method, but the requirements for test methods and modeling simulation are relatively high

Method used

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  • Composite material elastic property variability identification method based on strain full-field measurement
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  • Composite material elastic property variability identification method based on strain full-field measurement

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Embodiment 1

[0030] This embodiment provides a method for identifying the dispersion of elastic properties of composite materials.

[0031] like figure 1 As shown, the method for identifying the discreteness of elastic properties of composite materials in the embodiment of the present invention includes the following steps:

[0032] Step 1: Obtain the full-field strain of the sample during the elastic performance test of the sample.

[0033] The full-field strain of the sample was obtained by digital image correlation method. Speckles can be prepared on the surface of the sample before the test, and a CCD camera is used to collect the plane image of the sample surface during the test; after the test, digital image correlation technology is used to define the plane Cartesian coordinates, and data processing is performed to obtain the feature points of the sample surface displacement where i=1,2,...,N, There is a functional relationship between feature point coordinates and displaceme...

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Abstract

The invention provides a composite material elastic property variability identification method based on strain full-field measurement. The method is combined with a finite element for inverse problem analysis, and full-field strain information is obtained in an experiment; a strain field is divided into a limited number of subareas, and average strain information is obtained; then the initial material property of each subarea is obtained; a simulation model of a sample test experiment is built; the material properties obtained from last time of calculation are substituted into the simulation model, and new subarea material elastic properties are calculated through iteration till iteration meets a convergence criterion; the material property of each subarea serves as a sample, a statistical parameter mean value and a standard deviation for representing material property discreteness are calculated, multiple material properties are obtained through one time of experiment, and accordingly composite material variability identification is achieved. The method can reduce experiment cost and is low in requirement of test and simulation means.

Description

technical field [0001] The invention relates to a method for identifying variability of elastic properties of composite materials based on strain full-field measurement. Background technique [0002] Composite materials are materials with new properties macroscopically composed of two or more materials with different properties through physical or chemical methods. From a structural point of view, composite materials are not only materials, but also microstructures composed of component materials. Due to production process fluctuations and other reasons, the microstructure variability of composite materials is obvious, resulting in obvious fluctuations in its material properties. In the process of analyzing the structure of composite materials, in order to ensure the accuracy of the analysis, it is necessary to consider the fluctuation of the performance of composite materials. [0003] The most direct way to obtain the performance volatility of composite materials is to p...

Claims

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Application Information

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IPC IPC(8): G01N21/84
CPCG01N21/84G01N2021/8472
Inventor 孟松鹤杨强解维华金华易法军许承海
Owner HARBIN INST OF TECH
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