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Strain measurement method

A strain measurement and measurement point technology, applied in the field of strain measurement, can solve problems such as strain that is difficult to reveal the intrinsic characteristics of material strain, and achieve the effect of huge economic benefits

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method that can satisfy the strain measurement of tensile samples, and solve the problems such as strain that is difficult to reveal the intrinsic characteristics of material strain in the prior art

Method used

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Embodiment Construction

[0021] The method for strain measurement of the present invention, concrete operation is:

[0022] (1) if figure 1 As shown in Fig. 1, design and manufacture copper plate tensile test samples, the reference standard for sample processing is GB / T 228-2002, and the surface of sample 1 is sprayed with spray paint 2 for speckle measurement;

[0023] (2) The spray paint 2 used for speckle measurement on the surface of sample 1 should be in sharp contrast with the sample surface color, the speckle measurement points should be small, the influence on the sample intensity is less than 0.1%, and it should be easy to remove;

[0024] Depending on the color, you can choose to use different colors of white matt spray paint, black matt spray paint, red matt spray paint, yellow matt spray paint or blue matt spray paint, etc. In this embodiment, the paint used for spraying speckle measurement is commonly used white matt spray paint, and the thickness of the spray paint is 1-10 μm (3 μm in t...

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Abstract

The invention relates to the field of strain measurement, in particular to a method for measuring the strain of a tensile sample, which solves the problem in the prior art that strain cannot reveal the intrinsic characteristics of material strain. The method comprises the following steps: 1, spray paint for speckle measurement is sprayed on the surface of the sample, and the color of the spray paint is in sharp contrast to the surface color of the sample; 2, the sample is mounted and clamped on a tensile testing machine, measuring devices are connected, measurement parameters are set, the test is started, and testing data are recorded; and 3, the size of a speckle measuring point ranges from 0.1 to 50 micrometers, speckles are distributed randomly, the strain distribution of the speckle measuring points is measured, and a measurement report containing strain gradient distribution is formed. The strain distribution provided by the method is important in revealing the intrinsic characteristics of a material. Particularly, to obtain the whole-field strain distribution, the speckle measurement technology is applied to tensile sample surface measurement.

Description

technical field [0001] The invention relates to the field of strain measurement, in particular to a method capable of satisfying strain measurement of tensile samples. Background technique [0002] Strain measurement methods for stretched samples are currently commonly used strain gauge measurement methods. Groups of strain gauges are often used to stick to the elastic body and connect with the sample, and the strain signal is formed by signal amplification, conditioning and calibration, such as various strain measurement extensometers. etc.; the laser measurement method forms a laser band on the surface of the sample, and the signals measured by the reflection mark are calibrated into strain signals through identification and amplification, such as various laser extensometers; the image measurement method is a new type of measurement in recent years. Forming images and marking points on the surface of the sample to measure one or two sets of strain signals, such as various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/30G01N3/08
Inventor 温井龙谭军姚戈
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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