CN104316401A - Two-dimensional digital image correlation method-based particle strain testing device - Google Patents
Two-dimensional digital image correlation method-based particle strain testing device Download PDFInfo
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Abstract
The invention discloses a two-dimensional digital image correlation method-based particle strain testing device. The two-dimensional digital image correlation method-based particle strain testing device comprises a loading device, a device under test, a driving device and an acquisition device. The loading device carries out a single-shaft compression test on particle samples in the device under test by a force application block. The particle samples are orderly arranged in a volume-variable clamping box so that particle sample tests having different arrangement can be designed by change of a volume. A CCD camera acquires digital speckle images of the particle samples before and after deformation. Through an area-based gray scale coupling algorithm, displacement and strain of all points in a selected interested area are calculated so that full-field measurement is realized. The two-dimensional digital image correlation method-based particle strain testing device solves the problems of sample material limitation and narrow measurement scale, has the advantages of simple optical path and low environmental requirement, non-contact and full-field measurement, greatly simplifies an operation process and improves a measurement rate and precision of particle deformation.
Description
Technical field
The present invention relates to particulate matter experiment detection technique field, particularly relate to a kind of particulate matter strain detection testing device based on two-dimensional digital image correlation method.
Background technology
Particulate matter is that a large amount of discrete particle interacts and the complex system of formation, extensively be present in nature, produce closely related with mankind's daily life, such as occurring in nature sandstone, soil etc., grain in daily life, sugar, salt etc., coal ore, chemical products etc. in commercial production, can say particulate matter be the earth exists at most, one of the most inseparable with mankind material type.The engineer applied such as soil mechanics, chemical engineering subject has carried out scrutiny to its macroscopic property, but is just obtain gradually over the past two decades paying attention to the research of its physical mechanism.In granular solids, the research means of the power regularity of distribution mainly comprises experiment detection and numerical simulation, but for the particulate matter system of complexity, study the mechanical property knowing granule interior, especially relative position between the Strain Distribution of aspect and particle is carefully seen, be only far from being enough by numerical simulation, reliable experimental data also will be had to do basis.The measuring method of existing particle contacts power is roughly divided into two classes: 1. contact measurement method, comprise high-precision electronic sensing weighing method, develop the color sensitive creasing method etc., they can detect the contact force distribution situation in granular system on a certain cross section, but inevitably interference is brought to granular system, because inter-particulate forces chain is very responsive to the reacting condition of local power, the slight change that detection causes is enough to make riding chain structure, and great changes will take place.2. non-contact detection method, mainly comprise photoelastic method, confocal microscope method and magnetic resonance elastography method, their advantage is noiseless detection, but fluorescence co-focusing method and magnetic resonance elastography method measurement scale smaller, and cannot to observe in real time, dynamically.At present, most widely used is photoelasticity stress analysis method, but existing photoelasticity stress analysis method only can analyze the transparent material with birefringence effect, so particle sample material is very limited.
The basic theory aspect of domestic many scholars to two-dimensional digital image correlation method (2D-DIC) there has been darker research, and it is a kind of non-interfering based on computer vision and image recognition principle, noncontact, whole audience observation technology.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of particulate matter strain detection testing device based on two-dimensional digital image correlation method is provided.This proving installation, by preserving the speckle image of the specimen surface under original state as with reference to image, then records the speckle image after loading as target image.Because in image, each pixel have recorded the half-tone information of corresponding object point, by can to calculate based on the Gray-scale Matching algorithm in region in selected area-of-interest displacement a little and strain, and then realize measurement of full field.Compare these experiment detection methods above-mentioned, this proving installation not only overcomes the restriction of particle sample material and the narrow problem of measurement scale, and it is simple to have light path,, the advantage such as noncontact and measurement of full field lower to environmental requirement, which greatly simplifies the operating process of operator, improve measuring speed and the precision of particulate matter deformation simultaneously.Due to particle coordination number to granular system strain and geometry properties influence very large, be the important parameter that particulate matter experiment detects always, can the clamping box of electrodeless adjustment so devise a kind of volume, be used for fixing the particulate samples of arranging with any coordination number.Tested by the particulate samples designing different arrangement, to study the impact of particle coordination number on granular system strain and geometry characteristic.
For achieving the above object, the present invention adopts following technical proposals:
A kind of particulate matter strain detection testing device based on two-dimensional digital image correlation method, comprise charger, tested device, drive unit, harvester and worktable, described charger carries out uniaxial compression test by afterburning block to the particulate samples in tested device, and particulate samples is arranged in a kind of clamping box of variable volume successively;
Described clamping box is made up of mainboard and side plate two parts, described mainboard bottom surface and front have the threaded hole of M10, described side plate bottom surface and front have the groove of diameter D=11, and the threaded hole of described mainboard and the groove of side plate are bolted, and realize the electrodeless adjustment of volume; Described tools for bolts ' pretension, realizes side plate and fixes; Described bolt unscrews, and realizes the electrodeless adjustment of side plate, thus designs the particulate samples experiment of different arrangement by changing volume;
Described drive unit comprises handle, ball screw, feed screw nut, Y-direction guide rail, platform and spiral lift device; Ball screw supports on the table by bearing seat, described platform central and feed screw nut are connected, the corner of described platform is connected by slide block with described Y-direction guide rail, described Y-direction guide rail adopts H type to be arranged symmetrically with, ensure Y-direction stable movement, to ensure particulate samples and the operating distance reasonably stability with the ccd video camera in harvester; Described spiral lift device is bolted on platform, is made up of screw sheel and stud, in order to obtain accurate correlation analysis result, being adjusted to picture minute surface, making it be parallel to particulate samples surface by fine setting stud;
Described harvester comprises ccd video camera, imaging lens, light source and computing machine; Described ccd video camera is fixed on stud, and described imaging lens is arranged on ccd video camera, and is connected with computing machine by data line, and described light source is fixing on the table by bearing.
Based on the strain testing method of the particulate matter Failure under Uniaxial Compression of two-dimensional digital image correlation method, adopt the digital speckle image of particulate samples before and after ccd video camera collection distortion, because the gray-scale value of speckle image every bit is different, intensity profile in a zonule near every bit and other point are also not quite similar, and this zonule is called subarea.And then a certain region in the digital gray scale field before distortion is defined as sample subarea, region corresponding with it after distortion is called target subarea, the corresponding relation in target subarea and sample sub-range just can be identified through related software disposal system, and both difference deducibilitys go out the deformation information of sample, thus to calculate in selected subarea displacement a little and strain.
The described method of inspection comprises the steps:
(1) particulate samples is prepared from by a kind of black rubber material, and does cleaning, then sprays dumb light white paint, controls the size formation uniform outer surface speckle pattern that sprays paint.Successively be arranged in the clamping box of the electrodeless adjustment of volume by particulate samples with 6 and 4 two kinds of coordination progression again, particle arrangement mode is shown in accompanying drawing 2 and accompanying drawing 3.Because clamping box can electrodelessly regulate, thus particulate samples can obtain above-mentioned other coordination number do not listed with arbitrary arrangement mode.
(2) operating distance determining rational particulate samples and ccd video camera is regulated by handle, simultaneously tangent screw jacking gear, to ensure that imaging lens is parallel with particulate samples surface.
(3) open image capturing system, and light source is adjusted to suitable angular intensity, image acquisition parameter is set, storing path, prepare to start compression test and image acquisition.
(4) inspection apparatus and system again, guarantee that each side normally works, open loading system, by afterburning block, uniaxial compression test is carried out to particulate samples, carry out the image acquisition of ccd video camera, in the file set up before the sample image of collection can be stored automatically in simultaneously.
(5) finally by the image that loading by means of digital image correlation method Treatment Analysis collects, the displacement field of particulate matter in Failure under Uniaxial Compression and strain field is obtained.
Technical conceive of the present invention is: wait effect excellent in test based on loading by means of digital image correlation method in stretching, in conjunction with the deficiency of particulate matter experiment detection technique, for the deformation detection of particulate matter in Failure under Uniaxial Compression, has invented this strain detection testing device.Due to particle coordination number to granular system strain and geometry properties influence very large, be the important parameter that particulate matter experiment detects always, can the clamping box of electrodeless adjustment so devise a kind of volume, be used for fixing the particulate samples of arranging with any coordination number.
Beneficial effect of the present invention is mainly manifested in: adopt this device to utilize two-dimensional digital image correlation technique to measure the distortion in particulate matter Failure under Uniaxial Compression, not only overcome the restriction of sample material and the narrow problem of measurement scale, and it is simple to have light path,, the advantage such as noncontact and measurement of full field lower to environmental requirement, which greatly simplifies the operating process of operator, improve measuring speed and the precision of particulate matter deformation simultaneously.Meanwhile, devise the clamping box of the electrodeless adjustment of a kind of volume, be used for holding particulate samples, tested by the particulate samples designing different arrangement, to study the impact of particle coordination number on granular system strain and geometry characteristic.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 to be particle coordination number be 6 sample arrangement schematic diagram;
Fig. 3 to be particle coordination number be 4 sample arrangement schematic diagram;
Fig. 4 is that volume can the clamping box structural representation of electrodeless adjustment;
Fig. 5 is spiral lift device structural representation;
In figure, symbol description is as follows: 1 charger; 2 particulate samples; 3 afterburning blocks; 4 clamping boxes; 5 spiral lift devices; 6 ccd video cameras; 7 light sources; 8 platforms; 9 ball screws; 10 Y-direction guide rails; 11 handles; 12 computing machines; 13 worktable.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of strain measurement method of the particulate matter Failure under Uniaxial Compression based on two-dimensional digital image correlation method, be characterized in utilizing loading by means of digital image correlation method to carry out distortion measurement to particulate matter, and then calculate displacement field and the strain field of sample surfaces under different coordination number.
With reference to Fig. 1, Fig. 4, Fig. 5, strain gauge means comprises charger 1, drive unit, harvester and worktable 13.Tested device comprises clamping box 4 and particulate samples 2; Drive unit comprises spiral lift device 5, platform 8, ball-screw 9, Y-direction guide rail 10 and handle 11; Harvester comprises ccd video camera 6, light source 7 and computing machine 12.Described charger 1 carries out uniaxial compression test by the particulate samples 2 in afterburning block 3 pairs of tested device, and particulate samples 2 is arranged in a kind of clamping box 4 of variable volume successively.
Described clamping box 4 is made up of mainboard 41 and side plate 42 two parts, described mainboard 41 bottom surface and front have the threaded hole of M10, described side plate 42 bottom surface and front have the groove of diameter D=11, and the threaded hole of described mainboard is connected by bolt 43 with the groove of side plate, and realize the electrodeless adjustment of volume.Described bolt 43 pretension, realizes side plate 42 and fixes; Described bolt 43 unscrews, and realizes the electrodeless adjustment of side plate 42, thus designs the particulate samples experiment of different arrangement by changing volume.
Described drive unit comprises handle 11, ball screw 9, Y-direction guide rail 10, platform 8 and spiral lift device 5.Ball screw 9 is supported on worktable 13 by bearing seat, described platform 8 central authorities are connected with feed screw nut, and corner and Y-direction guide rail 10 slide block are connected, and described Y-direction guide rail 10 adopts H type to be arranged symmetrically with, ensure Y-direction stable movement, to ensure the operating distance reasonably stability of particulate samples 2 and video camera 6.Described spiral lift device 5 is bolted on platform 8, is made up of screw sheel 51 and stud 52, in order to obtain accurate correlation analysis result, is adjusted to picture minute surface by fine setting stud 52, makes it be parallel to particulate samples 2 surface.
Described harvester comprises ccd video camera 6, imaging lens, light source 7 and computing machine 12.Described ccd video camera 6 is fixed on stud 52 by the stud bolt 53 of M6, and described imaging lens is arranged on ccd video camera 6, and is connected with computing machine 12 by data line, and described light source 7 is fixed on worktable 13 by bearing.
The described method of inspection comprises the steps:
(1) based on the strain testing method of the particulate matter Failure under Uniaxial Compression of two-dimensional digital image correlation method, be first the preparation of particulate samples speckle pattern.Particulate samples 2 is prepared from by a kind of black rubber material, and does cleaning, then sprays dumb light white paint, controls the size formation uniform outer surface speckle pattern that sprays paint.Successively be arranged in the clamping box 4 of the electrodeless adjustment of volume by particulate samples 2 with 6 coordination progression 21 and 4 coordination progression 22 again, particle arrangement mode is shown in accompanying drawing 2 and accompanying drawing 3.Because clamping box can electrodelessly regulate, thus particulate samples can obtain above-mentioned other coordination number do not listed with arbitrary arrangement mode.
(2) operating distance determining rational sample 2 and ccd video camera 6 is regulated by handle 11, simultaneously tangent screw jacking gear 5, to ensure that imaging lens is parallel with sample surfaces.
(3) open image capturing system, and light source 7 is adjusted to suitable angular intensity, image acquisition parameter is set, storing path, prepare to start compression test and image acquisition.
(4) inspection apparatus and system again, guarantee that each side normally works, open loading system 1, carry out uniaxial compression test by afterburning block 3 pairs of particulate samples 2, carry out the image acquisition of ccd video camera 6, in the file set up before the sample image of collection can be stored automatically in simultaneously.
(5) finally by the image that two-dimensional digital image correlation method Treatment Analysis collects, the displacement field of particulate matter in Failure under Uniaxial Compression and strain field is obtained.Gray-scale value based on speckle image every bit is different, and the intensity profile in a zonule near every bit is also not quite similar in other point, and this zonule is called subarea.And then a certain region in the digital gray scale field before distortion is defined as sample subarea, region corresponding with it after distortion is called target subarea, the corresponding relation in target subarea and sample sub-range just can be identified through related software disposal system, and both difference deducibilitys go out the deformation information of sample, thus to calculate in selected subarea displacement a little and strain.
Claims (2)
1. the particulate matter strain detection testing device based on two-dimensional digital image correlation method, comprise charger (1), tested device, drive unit, harvester and worktable (13), it is characterized in that: described charger (1) carries out uniaxial compression test by afterburning block (3) to the particulate samples (2) in tested device, particulate samples (2) is arranged in a kind of clamping box (4) of variable volume successively;
Described clamping box (4) is made up of mainboard (41) and side plate (42) two parts, described mainboard (41) bottom surface and front have the threaded hole of M10, described side plate (42) bottom surface and front have the groove of diameter D=11, the threaded hole of described mainboard (41) and the groove of side plate are bolted, and realize the electrodeless adjustment of volume; Described bolt (43) pretension, realizes side plate (42) and fixes; Described bolt (43) unscrews, and realizes side plate (42) electrodeless adjustment, thus designs the particulate samples experiment of different arrangement by changing volume;
Described drive unit comprises handle (11), ball screw (9), feed screw nut, Y-direction guide rail (10), platform (8) and spiral lift device (5); Ball screw (9) is supported on worktable (13) by bearing seat, described platform (8) central authorities are connected with feed screw nut, the corner of described platform is connected by slide block with described Y-direction guide rail (10), described Y-direction guide rail (10) adopts H type to be arranged symmetrically with, ensure Y-direction stable movement, to ensure the operating distance reasonably stability of the ccd video camera (6) in particulate samples (2) and harvester; Described spiral lift device (5) is bolted on platform (8), be made up of screw sheel (51) and stud (52), in order to obtain accurate correlation analysis result, being adjusted to picture minute surface by fine setting stud (52), making it be parallel to particulate samples (2) surface;
Described harvester comprises ccd video camera (6), imaging lens, light source (7) and computing machine (12); Described ccd video camera (6) is fixed on stud, and described imaging lens is arranged on ccd video camera (6), and is connected with computing machine (12) by data line, and described light source (7) is fixed on worktable (13) by bearing.
2. a kind of particulate matter strain detection testing device based on two-dimensional digital image correlation method according to claim 1, is characterized in that: the method for inspection of described this proving installation of use comprises the steps:
1) particulate samples (2) is prepared from by a kind of black rubber material, and does cleaning, then sprays dumb light white paint, controls the size formation uniform outer surface speckle pattern that sprays paint; Successively particulate samples (2) is arranged in the clamping box (4) of the electrodeless adjustment of volume with 6 and 4 two kinds of coordination progression again; Because clamping box (4) can electrodelessly regulate, thus particulate samples (2) can obtain above-mentioned other coordination number do not listed with arbitrary arrangement mode;
2) operating distance determining rational particulate samples (2) and ccd video camera (6) is regulated by handle (11), simultaneously tangent screw jacking gear (5), to ensure that imaging lens is parallel with particulate samples (2) surface;
3) open image capturing system, and light source (7) is adjusted to suitable angular intensity, image acquisition parameter is set, storing path, prepare to start compression test and image acquisition;
4) inspection apparatus and system again, guarantee that each side normally works, open loading system (1), by afterburning block (3), uniaxial compression test is carried out to particulate samples (2), carry out the image acquisition of ccd video camera (6), in the file set up before the sample image of collection can be stored automatically in simultaneously;
5) finally by the image that loading by means of digital image correlation method Treatment Analysis collects, the displacement field of particulate matter in Failure under Uniaxial Compression and strain field is obtained.
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| CN104729916A (en) * | 2015-02-06 | 2015-06-24 | 浙江工业大学 | Particle substance strain testing device and method based on three-dimensional digital image correlation method |
| CN107101888A (en) * | 2017-05-27 | 2017-08-29 | 青岛理工大学 | Rock compression failure prediction method |
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| CN114216820A (en) * | 2021-12-13 | 2022-03-22 | 青岛理工大学 | Device and method for identifying internal force chain of three-dimensional particle system |
| CN117191856A (en) * | 2023-09-12 | 2023-12-08 | 中国矿业大学 | Coal micro-component thermal strain digital image measuring device and method |
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