CN102564282A - Strain measurement method - Google Patents
Strain measurement method Download PDFInfo
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- CN102564282A CN102564282A CN201010590287XA CN201010590287A CN102564282A CN 102564282 A CN102564282 A CN 102564282A CN 201010590287X A CN201010590287X A CN 201010590287XA CN 201010590287 A CN201010590287 A CN 201010590287A CN 102564282 A CN102564282 A CN 102564282A
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- sprays paint
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Length Measuring Devices By Optical Means (AREA)
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
The present invention relates to the strain measurement field, be specially a kind of method that can satisfy the strain measurement of stretching sample.
Background technology
The strain measurement method of stretching sample is at present general has a foil gauge measuring method, adopts in groups foil gauge to stick on the elastic body to be connected with sample more, amplifies conditioning through signal and demarcates and wait the formation strain signal, like various strain measurement extensometers etc.; Laser measurement method forms the band of a laser at sample surfaces, comes the signal measured respectively through reflective sigh, amplifies through identification and demarcates into strain signal, like various laser extensometers etc.; Image measuring method is novel in recent years metering system, forms image and gauge point is measured one group or two groups of strain signals at sample surfaces, like various video extensometers etc.; Other measuring methods are like grating measuring method and moire disposal route, in the measurement of the sample that seldom is applied to stretch.More than the measuring method of these strains all be for traditional strain measurement, the evaluation strain in the gauge length scope that provides, this measured value only can reflect the material strain intrinsic characteristics to a certain extent.
Summary of the invention
The object of the present invention is to provide a kind of method that can satisfy the strain measurement of stretching sample, solve the problems such as strain that are difficult to disclose the material strain intrinsic characteristics in the prior art.
Technical scheme of the present invention is:
A kind of method of strain measurement comprises the steps:
(1) sprays speckle measurement with spraying paint at sample surfaces;
What sample surfaces spraying speckle measurement was used sprays paint and sample surfaces appearance look formation sharp contrast, and different according to color, the white inferior light of selection use different colours sprays paint, black matt sprays paint, red inferior light sprays paint, yellow inferior light sprays paint or blue inferior light sprays paint;
(2) clamping sample on cupping machine connects measurement mechanism, and measurement parameter is set, and begins test, the record test figure;
(3) size of speckle measurement point is 0.1-50 μ m, and speckle is a stochastic distribution, measures the Strain Distribution of speckle measurement point, forms to have the measurement report that strain gradient distributes.
The method of described strain measurement, the influence to sample strength of spraying paint is less than 0.1%.
The method of described strain measurement, the thickness that sprays paint are 1-10 μ m.
The invention has the beneficial effects as follows:
1, the Strain Distribution that provides of the inventive method has great significance for the intrinsic characteristics that discloses material, specifically uses speckle measurement technique and realizes the Strain Distribution that measures the whole audience to the stretching sample surfaces.
2, obtain the stretching identified as samples apart from interior mean strain by the employing sample in past, this strain can only provide material strain character qualitatively for material different, has limited to the application of material in actual condition.The Strain Distribution that the inventive method provides is the strain intrinsic characteristics of illustrative material effectively, will play significant impetus to the application of material, will obtain huge economic benefit.
3, the present invention is applicable to metal material and nonmetallic materials, comprises various alloy materials, plastics, rubber, pottery etc.
Description of drawings
Fig. 1 is a stretching sample synoptic diagram.
Among the figure, 1 sample; 2 spray paint.
Fig. 2 is the strain gradient synoptic diagram.
Fig. 3 is section length and strain curve figure.
Fig. 4 is time and strain curve figure.
Embodiment
The method of strain measurement of the present invention, concrete operations are:
(1) as shown in Figure 1, design and produce the tabular extension test sample of copper material, the processing normative reference GB/T 228-2002 of sample, sample 1 surface spraying speckle measurement is with spraying paint 2;
(2) sample 1 surface spraying speckle measurement is used sprays paint and 2 should form sharp contrast with sample surfaces appearance look, and speckle measurement point is tiny, and the influence of sample strength less than 0.1%, and is easy to removing;
Different according to color, the white inferior light that can select to use different colours sprays paint, black matt sprays paint, red inferior light sprays paint, yellow inferior light sprays paint or blue inferior light sprays paint etc.In the present embodiment, the coating that the spraying speckle measurement is used adopts white inferior light commonly used to spray paint, and the thickness that sprays paint is 1-10 μ m (present embodiment is 3 μ m).
Clamping sample on cupping machine connects measurement mechanism, and measurement parameter is set, and begins test, the record test figure.
As shown in Figure 2, in the present embodiment, the size of speckle measurement point (SP1, SP2, SP3, SP4, SP5) is 0.1-50 μ m (present embodiment is 10-20 μ m), and speckle is a stochastic distribution.Measure the Strain Distribution of speckle measurement point with the ARAMIS measuring system of GOM company, also be fine, form the measurement report that has the strain gradient distribution with the like product of other companies.
Can find out by Fig. 2 and Fig. 3, account for 40% of overall strain, account for 70% of overall strain, account for 90% of overall strain in the strain of the 6mm of cracking place scope in the strain of the 4mm of cracking place scope in the strain of the 2mm of cracking place scope.This example material is the Strain Distribution heterogeneous material, and it is inhomogeneous that material character has deformability, in the process of practical application, should increase safety coefficient.For the uneven concrete reason of this example Strain Distribution, should further carry out theoretical research.
Can find out by Fig. 4; When stretching 1.3 milliseconds the time; Be positioned at the strain maximum (120%) of the measurement point SP3 of cracking center; Nearer symmetrical measurement point SP2, the strain of SP4 are taken second place (60-80%) apart from the cracking center, symmetrical measurement point SP1 far away, the strain less (15%) of SP5 apart from the cracking center.
Claims (3)
1. the method for a strain measurement is characterized in that, comprises the steps:
(1) sprays speckle measurement with spraying paint at sample surfaces;
What sample surfaces spraying speckle measurement was used sprays paint and sample surfaces appearance look formation sharp contrast, and different according to color, the white inferior light of selection use different colours sprays paint, black matt sprays paint, red inferior light sprays paint, yellow inferior light sprays paint or blue inferior light sprays paint;
(2) clamping sample on cupping machine connects measurement mechanism, and measurement parameter is set, and begins test, the record test figure;
(3) size of speckle measurement point is 0.1-50 μ m, and speckle is a stochastic distribution, measures the Strain Distribution of speckle measurement point, forms to have the measurement report that strain gradient distributes.
2. according to the method for the described strain measurement of claim 1, it is characterized in that the influence to sample strength of spraying paint is less than 0.1%.
3. according to the method for the described strain measurement of claim 1, it is characterized in that the thickness that sprays paint is 1-10 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010590287XA CN102564282A (en) | 2010-12-15 | 2010-12-15 | Strain measurement method |
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| CN201010590287XA CN102564282A (en) | 2010-12-15 | 2010-12-15 | Strain measurement method |
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| CN102564282A true CN102564282A (en) | 2012-07-11 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849144A (en) * | 2015-05-26 | 2015-08-19 | 山东大学 | Method for detecting strain strengthening non-homogeneous deformation of stainless steel welded joint |
| CN105510125A (en) * | 2016-01-12 | 2016-04-20 | 济南大学 | Video extensometer and marker line positioning method based on video extensometer |
| CN105784487A (en) * | 2016-05-06 | 2016-07-20 | 清华大学 | Tensile test apparatus for thin-film materials |
| CN108548834A (en) * | 2018-05-07 | 2018-09-18 | 湖南大学 | A kind of strain measurement method based on SEM in situ imaging systems |
| CN113702174A (en) * | 2020-05-22 | 2021-11-26 | 株式会社岛津制作所 | Strain distribution measuring system and strain distribution measuring method |
| CN115597970A (en) * | 2022-11-17 | 2023-01-13 | 太原科技大学（Cn） | Strain distribution testing method for copper-containing stainless steel sheet |
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| CN1901418A (en) * | 2006-07-21 | 2007-01-24 | 南京大学 | Method and system for monitoring soil property side slope distributive fiber optic strain |
| CN101182994A (en) * | 2007-12-10 | 2008-05-21 | 哈尔滨工业大学 | Non-contact type measurement indirect tensile strain method |
| CN101477052A (en) * | 2009-01-05 | 2009-07-08 | 天津大学 | Strain component lossless detection technology based on carbon nano-tube as sensing medium |
| CN101514890A (en) * | 2009-03-27 | 2009-08-26 | 清华大学 | Two dimension optical rosette measurement method based on optical shearing |
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2010
- 2010-12-15 CN CN201010590287XA patent/CN102564282A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1901418A (en) * | 2006-07-21 | 2007-01-24 | 南京大学 | Method and system for monitoring soil property side slope distributive fiber optic strain |
| CN101182994A (en) * | 2007-12-10 | 2008-05-21 | 哈尔滨工业大学 | Non-contact type measurement indirect tensile strain method |
| CN101477052A (en) * | 2009-01-05 | 2009-07-08 | 天津大学 | Strain component lossless detection technology based on carbon nano-tube as sensing medium |
| CN101514890A (en) * | 2009-03-27 | 2009-08-26 | 清华大学 | Two dimension optical rosette measurement method based on optical shearing |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849144A (en) * | 2015-05-26 | 2015-08-19 | 山东大学 | Method for detecting strain strengthening non-homogeneous deformation of stainless steel welded joint |
| CN104849144B (en) * | 2015-05-26 | 2017-05-03 | 山东大学 | Method for detecting strain strengthening non-homogeneous deformation of stainless steel welded joint |
| CN105510125A (en) * | 2016-01-12 | 2016-04-20 | 济南大学 | Video extensometer and marker line positioning method based on video extensometer |
| CN105784487A (en) * | 2016-05-06 | 2016-07-20 | 清华大学 | Tensile test apparatus for thin-film materials |
| CN105784487B (en) * | 2016-05-06 | 2019-03-01 | 清华大学 | A kind of tensile test apparatus of thin-film material |
| CN108548834A (en) * | 2018-05-07 | 2018-09-18 | 湖南大学 | A kind of strain measurement method based on SEM in situ imaging systems |
| CN113702174A (en) * | 2020-05-22 | 2021-11-26 | 株式会社岛津制作所 | Strain distribution measuring system and strain distribution measuring method |
| CN115597970A (en) * | 2022-11-17 | 2023-01-13 | 太原科技大学（Cn） | Strain distribution testing method for copper-containing stainless steel sheet |
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Application publication date: 20120711 |