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Nondestructive detection method for elastic modulus and in plane shear modulus of large-size wood based panel

A kind of elastic modulus, non-destructive testing technology, applied in measuring devices, using sonic/ultrasonic/infrasonic waves to analyze solids, using sonic/ultrasonic/infrasonic waves for material analysis, etc. Simple, time-saving effect

Inactive Publication Date: 2016-11-09
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method takes a long time to detect and the operation is complicated

Method used

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  • Nondestructive detection method for elastic modulus and in plane shear modulus of large-size wood based panel
  • Nondestructive detection method for elastic modulus and in plane shear modulus of large-size wood based panel

Examples

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Embodiment 1

[0044] The following is a combination of a measurement of a sheet, based on the specific implementation of the measurement method. The board material is medium density fiberboard (MDF), and the board size (length×width×thickness) is 2440×1220×14.96mm. The special software used for signal acquisition, analysis and processing in computer 2 is compiled in Labview virtual instrument language. figure 2 Shown.

[0045] (1) Place the plates.

[0046] By measuring the length and width dimensions of the measured plate 4, the two nodal lines of the first-order bending mode of free vibration in the length direction and the four nodal lines of the first-order bending mode of the width direction are determined. To adjust the position of the four fulcrums on the measuring support device to coincide with these four intersections, place the measured plate horizontally on the measuring support device so that the length and width directions are completely symmetrical.

[0047] (2) Set the measurem...

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Abstract

The invention relates to a nondestructive detection method for the elastic modulus and the in plane shear modulus of a large-size wood based panel. The nondestructive detection method comprises: 1, placing a plate; 2, setting a measurement result storage directory and a file name, and inputting the basic parameters of the plate; 3, measuring the quality of the plate; 4, measuring the elastic modulus of the plate in a length direction, the elastic modulus of the plate in a width direction, and the in plane shear modulus; and 5, storing, and displaying the measurement result. According to the present invention, with the method, the main mechanical property indices such as the elastic modulus in the length direction, the elastic modulus in the width direction, the in plane shear modulus and the like can be nondestructively, quickly, conveniently and concurrently determined; and compared with the traditional detection method (small specimen bending measurement, tensile measurement, and the like), the method of the present invention has characteristics of non-destructive detection, time saving, cost saving, and convenient operation.

Description

Technical field [0001] The invention relates to a non-destructive testing method for the elastic modulus and in-plane shear modulus of a large-size man-made board, and belongs to the field of material mechanical performance test detection. Background technique [0002] Large-size wood-based panels specifically refer to finished wood-based panels with a rectangular size between 1.22~3.66m in length and 1.22~1.83m in width in the production and sales of wood-based panels at home and abroad, mainly including medium density fiberboard, There are four types of particle board, plywood and oriented strand board. [0003] At present, the detection of elastic modulus of large-size wood-based panels at home and abroad basically adopts the static bending detection method. This detection method is regulated by relevant national standards. Firstly, several standard specimens are cut from different parts of large-size plates. The dimensions of the specimen length×width×thickness (h) are (20h+50...

Claims

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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/045G01N2291/0238
Inventor 管成张厚江苗虎王天伟
Owner BEIJING FORESTRY UNIVERSITY
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