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Real-time measurement method for wood deformation microstructure characteristics

A microstructure, real-time measurement technology, applied in measurement devices, analysis of materials, strength characteristics, etc., can solve the problems of insufficient material properties, single strain results, and no strain situation, to shorten the image acquisition interval and improve the image quality. The effect of acquisition accuracy

Inactive Publication Date: 2009-12-16
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] 1. Judging the performance of wood materials only by macroscopic mechanical behavior is insufficient to grasp the performance of the material itself;
[0005] 2. Only the result of the mechanical behavior of the material can be understood, but the cause of the mechanical behavior is not known;
[0006] 3. The testing process cannot take into account the temperature, moisture content and other influencing factors of the tested material;
[0007] 4. The strain obtained during the detection process is the average strain of the material as a whole, which does not reflect the strain of different organizational structures of the material; it cannot reflect the relationship between the structure of each part of the wood and the overall stress and strain;
[0008] 5. For an anisotropic heterogeneous material such as wood, the obtained strain results are single, which cannot truly reflect the stress-strain results of each tissue structure of wood;
[0009]6. After the test is over, the springback of the tested material cannot be obtained in time, and the residual stress of the tested material cannot be analyzed

Method used

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  • Real-time measurement method for wood deformation microstructure characteristics
  • Real-time measurement method for wood deformation microstructure characteristics
  • Real-time measurement method for wood deformation microstructure characteristics

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Embodiment Construction

[0039] Such as figure 1 As shown, the present invention includes: a loading unit 1, a temperature control box 3, a sensor 4, a computer 5 (that is, an image processing unit), an optical microscope 6, a digital camera 7, and a video camera 8. The loading unit 1 is used to perform compression, stretching, or bending, shearing, torsion and other mechanical behaviors of the tested wood 2. The temperature control box 3 is connected with the tension and compression unit 1 and the computer 5, and is used to control the temperature of the wood to be inspected (theoretical range -140-600°C). The optical microscope 6 is connected with the digital camera 7, the video camera 8 and the computer 5, and is used for collecting images of the surface deformation of the wood under pressure or tension. Three sets of sensors 4, one set is connected to the footage system 12 in the loading unit 1, and used to measure the overall displacement of the tested wood 2; one set is connected to the load contro...

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Abstract

The invention discloses a real-time measurement method for wood deformation microstructure characteristics. The method comprises the following steps: 1) loading to-be-detected wood; 2) magnifying a to-be-detected area through a microscopic unit in the loading process; 3) acquiring image information through an image acquisition unit and then working out the X-axis length X0-Xn and the Y-axis length Y0-Yn of every cell on a loading surface at each image acquisition moment through an image processing unit; 4) calculating the pressure or tensile strain Epsilonxn and Epsilonyn of single cells on an X axis and a Y axis according to the X-axis length X0 and the Y-axis length Y0 of each cell before deformation, as well as the X-axis length Xn and the Y-axis length Yn of each cell after deformation, wherein Epsilonxn = (Xn-X0) / Xn, and Epsilonyn = (Yn-Y0) / Yn; and 5) averaging the pressure and tensile strain Epsilonxn and Epsilonyn of all single cells in the to-be-detected area magnified through the microscopic unit so as to obtain the pressure and tensile strain Epsilonx and Epsilony of a whole characterized wood on the X axis and the Y axis. The method can measure micro-area tissue and cell strain to realize micro-area deformation quantization, and can monitor micro-area defects.

Description

Technical field [0001] The invention relates to a method for real-time measurement of mechanical strength properties and deformation microstructure characteristics of wood and wood composite materials such as compression or tension. Background technique [0002] Wood and wood composite materials will inevitably encounter mechanical behaviors such as compression or tension during the production, processing and use. The testing of the mechanical properties of the materials is the key to ensuring the quality of subsequent products and their reasonable use. The performance and microstructure effects of materials or products and the effects of microstructure characteristics on the overall performance of materials are still unclear. [0003] For the current detection methods, a single macro-mechanical performance detection is mainly used. This detection method has many defects and shortcomings: [0004] 1. Judging the performance of wood materials only by macro-mechanical behavior is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01N3/00
Inventor 殷亚方刘波姜笑梅罗彬边明明宋坤霖阎昊鹏
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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