CN105300810A - Three-point bending test device with laser centering device - Google Patents
Three-point bending test device with laser centering device Download PDFInfo
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- CN105300810A CN105300810A CN201510851373.4A CN201510851373A CN105300810A CN 105300810 A CN105300810 A CN 105300810A CN 201510851373 A CN201510851373 A CN 201510851373A CN 105300810 A CN105300810 A CN 105300810A
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Abstract
The invention discloses a three-point bending test device with a laser centering device. The three-point bending test device comprises a lower support beam, an upper pressure head, two lower supports and the laser centering device, wherein a plurality of diamond-shaped and/or isosceles-triangle-shaped centering signs of which the symmetry axes are on the same straight line are arranged on the center lines of the top surface and the side surface of the lower support beam; a plurality of diamond-shaped and/or isosceles-triangle-shaped centering signs of which the symmetry axes are on the same straight line are arranged on the center line of the side surface of the upper pressure head; each lower support comprises a stretched spring, a base and a lower support roller, and the stretched spring is connected with the base and a suspension loop on the lower support roller; the base is connected with a slider under the base via tightening bolts, and the slider can slide in a concave chute in the lower support beam; the laser centering device comprises a cross laser. The three-point bending test device realizes centering according to beams of the cross laser, so that influence on centering from artificial subjective factors is reduced, and the accuracy of testing results is guaranteed.
Description
Technical field
The present invention relates to a kind of Metal Material Fatigue tearing test device, be specifically related to a kind of three point bending test device with laser centring device, be applied in metal material mechanics performance test field.
Background technology
Fatigue Cracking Test is the comparatively high-end test event of metal material field tests, and object is the toughness of test material, namely resists the ability of crack initiation and propagation, and its main parameter has KIC, CTOD, JIC, da/dn etc.The steel products such as pipe line steel, bridge steel, offshore platform steel, heavy rail clearly state in its standard needs such data as acceptance index.Therefore Fatigue Cracking Test is the important factor in order developing high-end structural steel.A common feature of Fatigue Cracking Test needs to open a gap (simulating crack) exactly on standard sample, under load effect, then test the parameter of crack tip change.The schematic diagram of Fatigue Cracking Test as shown in Figure 1, first on sample 5, drive dovetail groove 24, crack tip 21 is provided with on dovetail groove 24 top, then a roller 22 is established at the end face of sample 5,2 lower rollers 23 are established in the bottom surface of sample 5, a upper roller 22 and 2 lower rollers, 23 pairs of samples 5 exert a force, and carry out Fatigue Cracking Test.
The method of at present comparatively advanced measurement crack length is flexibility method, i.e. COD rule on sample dovetail groove place card, in order to test the change at dovetail groove place CMOD (crack mouth opening displacement), thus by the spread scenarios in Compliance equation inverse crackle forward position.The benefit of the method is that sample need not be destroyed just can the change of Real-Time Monitoring crackle, and therefore this method tests crack tip spread scenarios effective method the most at present.But the geometric parameter of this method to specimen clamping has higher requirement: 1, sample requires, with the length direction absolute upright propping up roller up and down, to avoid load offset to cause comparatively big error; 2, sample crack tip requires just in time to be on the center line of twice roller lines; The position of 3, above propping up roller and sample contacts is in (point of application above propping up roller is also on the center line of twice roller lines) on the extended line of direction of crack propagation.These three objects required are to reduce measuring error, and the result of test findings and theory calculate is consistent as far as possible.If specimen clamping can not meet above-mentioned three conditions, then can affect the action effect of power to crack tip of pilot system.Because part test controls crack length with flexibility method, then length data is fed back to computing machine and carry out controlling test, if sample centering is poor, repeatedly the measuring accuracy of crack length can cause error accumulation effect, thus the result that impact test is final, cause result inaccurate.Therefore, sample and the centering problem of propping up roller are up and down the key influence factors of three-point bending fracture test.
At present, sample and the centering problem of propping up roller up and down only rest in visual inspection, namely detect by an unaided eye and make sample meet above-mentioned three requirements.But the observation precision of naked eyes is poor, and also certain deviation can be there is in the observation of different testing crews, therefore this macroscopic centering mode produces test findings comparatively significantly affects, and in torture test, this impact is more obvious especially, has a strong impact on test findings accuracy.Because the load frequency of torture test is high, the test period is long, and the synergistic effect of repeated loading deviation can constantly be amplified in test.
Summary of the invention
The object of the present invention is to provide a kind of three point bending test device with laser centring device, the centering which solves existing sample and prop up roller up and down relies on naked-eye observation and the accuracy of alignment that causes is poor, the uncertain high error problem brought, improves test efficiency while raising test accuracy.
The present invention utilizes the focusing of low-power cross laser bundle and the feature of stability, devise the three point bending test device of a cuff laser alignment function, the cross laser bundle that this device sends can help test operation personnel quick-clamping sample, its centering is very clear by the demarcation of laser beam, substantially increases test accuracy and clamping efficiency.
The technical solution adopted in the present invention is:
With a three point bending test device for laser centring device, comprise lower support beam, seaming chuck, two undersettings be placed on lower support beam, the laser centring device that is connected with seaming chuck; Two undersettings lay respectively at the both sides of the center line of lower support beam, and equal to the distance of center line;
The top of described lower support beam is provided with matrix chute, and the end face of lower support beam and the center line of side are provided with multiple rhombus and/or isosceles triangle centering mark, and the axis of symmetry of all rhombuses or isosceles triangle centering mark is on same straight line; Namely ensure that the tip in rhombus centering mark and isosceles triangle centering mark is lower support beam geometric center along its length;
The center line of the side of described seaming chuck is provided with multiple rhombus and/or isosceles triangle centering mark, and the axis of symmetry of all rhombuses or isosceles triangle centering mark is on same straight line;
Described undersetting comprises back-moving spring, is respectively equipped with the base of hangers and a lower roller, and the side of described base is provided with baffle plate, and the height of this baffle plate is less than the diameter of a lower roller; Described back-moving spring is connected with the hangers on base and lower roller respectively; Base to be connected with the slide block under base by tighting a bolt, and slide block can slide in the matrix chute on lower support beam;
Described laser centring device comprises the cross line laser that can penetrate completely vertical cross light beam, the pivot arm be connected with cross line laser, the extension arm that is connected with seaming chuck, described pivot arm is connected with extension arm by turning axle, and this pivot arm can rotate around turning axle; By rotating the angle of the laser beam that pivot arm can regulate cross line laser to penetrate.
Further scheme is, described base and baffle plate as a whole.
Further scheme is, the tie point of described extension arm and seaming chuck is positioned on the center line of the side of seaming chuck, namely tie point is positioned on the axis of symmetry that isosceles triangle centering marks or rhombus centering marks on seaming chuck, and the side of seaming chuck is divided equally by this axis of symmetry completely.
Further scheme is, the bottom of described seaming chuck is circular arc block.
Lower support beam, seaming chuck are connected with the frame of general Fatigue Cracking Test, then two undersettings are placed on lower support beam, make two undersettings be positioned at the both sides of the center line of lower support beam, and make two undersettings equal to the distance of center line; Open cross line laser, by the injection angle of pivot arm adjusting laser beam, and regulate the anglec of rotation of cross laser bundle, vertical beam of light is just in time overlapped with the axis of symmetry that isoceles triangle centering marks, rhombus centering marks of seaming chuck, vertical beam of light also will overlap with the axis of symmetry that rhombus centering marks, isosceles triangle centering marks on lower support beam completely, now seaming chuck and lower support beam entirely on the center; The lower edge of the side of sample, on lower rod of undersetting, now only need overlap with light beam, can ensure that sample is vertical with lower rod by horizontal laser light beam; Make vertical beam of light by the crack tip of sample sample left and right adjusting again, ensure that sample is also in the center of pilot system.After completing operation above, the specimen clamping requirement of Fatigue Cracking Test can be ensured.
Beneficial effect of the present invention is:
1, carry out centering according to the light beam of cross line laser, decrease the impact of artificial subjective factor on centering, improve accuracy of alignment;
2, the raising of accuracy of alignment can improve the measuring accuracy of test, makes test findings more accurate;
3, the present invention can improve test efficiency, only needs the centering that just can complete sample for several seconds, very easy to use;
4, structure of the present invention is simple, is convenient to make, and cost of manufacture is low.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of existing Fatigue Cracking Test;
Fig. 2 is the one-piece construction schematic diagram of the three point bending test device of band laser centring device of the present invention;
Fig. 3 is the structural representation of lower support beam;
Fig. 4 is the syndeton schematic diagram of base and slide block;
Fig. 5 is the structural representation of undersetting;
Fig. 6 is the structural representation of seaming chuck;
Fig. 7 is the structural representation of laser centring device;
Fig. 8 is the syndeton schematic diagram of seaming chuck and laser centring device;
Fig. 9 is the schematic diagram that vertical beam of light overlaps with the axis of symmetry that the isosceles triangle centering on seaming chuck marks;
Figure 10 is the schematic diagram that vertical beam of light overlaps with the axis of symmetry that rhombus centering marks, isosceles triangle centering marks on lower support beam;
Figure 11 is the schematic diagram of horizontal laser light beam on lower roller;
Figure 12 is the schematic diagram that vertical beam of light overlaps with the crack tip of sample.
Wherein: 1, lower support beam, 2, undersetting, 3, seaming chuck, 4, laser centring device, 5, sample, 6, rhombus centering mark, 7, isosceles triangle centering mark, 8, spill chute, 9, tight a bolt, 10, base, 11, hangers, 12, slide block, 13, roller is propped up down, 14, back-moving spring, 15, pilot hole, 16, connecting screw rod, 17, extension arm, 18, pivot arm, 19, cross laser device, 20, baffle plate, 21, crack tip, 22, above prop up roller, 23, roller is propped up down, 24, dovetail groove, 25, vertical beam of light, 26, horizontal laser beam.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
See Fig. 2-Figure 12, a kind of three point bending test device with laser centring device, comprises lower support beam 1, seaming chuck 3, two undersettings 2 be placed on lower support beam 1, the laser centring device 4 that is connected with seaming chuck 3; Two undersettings 2 lay respectively at the both sides of the center line of lower support beam 1, and equal to the distance of center line;
The top of lower support beam 1 is provided with matrix chute 8, the center line of the end face of lower support beam 1 is provided with 2 rhombus centering marks 6, the center line of the side of lower support beam 1 is provided with 3 isosceles triangle centering marks 7, the axis of symmetry of all rhombuses and isosceles triangle centering mark is on same straight line, and lower support beam 1 is divided equally by this straight line; Namely ensure that the tip in rhombus centering mark 6 and isosceles triangle centering mark is lower support beam 1 geometric center along its length;
The center line of the side of seaming chuck 3 is provided with 3 isosceles triangle centering marks 7, and the axis of symmetry of this isosceles triangle centering mark 7 is on same straight line, and seaming chuck 3 is divided equally by this straight line;
Undersetting 3 comprises back-moving spring 14, is respectively equipped with the base 10 of hangers 11 and a lower roller 13, the side of base 10 is provided with baffle plate 20, and the height of this baffle plate 20 is less than the diameter of a lower roller 13, and in order to proof strength, by base 10 and baffle plate 20 integrated design, make as a whole; Back-moving spring 14 is connected with the hangers 11 on base 10 and lower roller 13 respectively; Base 10 9 to be connected with the slide block 12 under base 10 by tighting a bolt, and slide block 12 can slide in the matrix chute 8 on lower support beam 1;
Laser centring device 4 comprises the cross line laser 19 that can penetrate completely vertical cross light beam, the pivot arm 18 be connected with cross line laser 19, the extension arm 17 that is connected with seaming chuck 3, pivot arm 18 is connected with extension arm 17 by turning axle, this pivot arm 18 can rotate around turning axle, by rotating the angle of the laser beam that pivot arm 18 can regulate cross line laser 19 to penetrate; Extension arm 17 inserts in the pilot hole 15 in seaming chuck 3, and pilot hole 15 is positioned on the center line of the side of seaming chuck 3, and namely pilot hole 15 is positioned on the axis of symmetry of the isosceles triangle centering mark 7 on seaming chuck 3.
In order to ensure the accuracy of measurement data, the bottom of seaming chuck 3 is designed to circular arc block.Conveniently connect, seaming chuck 3 is provided with connecting screw rod 16.
Lower support beam 1, seaming chuck 3 are connected with the frame of general Fatigue Cracking Test, then two undersettings 2 are placed on lower support beam 1, make two undersettings 2 be positioned at the both sides of the center line of lower support beam 1, and ensure that two undersettings 2 are equal to the distance of center line; Open cross line laser 19, by the injection angle of pivot arm 18 adjusting laser beam, and regulate the anglec of rotation of cross laser bundle, the axis of symmetry making the vertical beam of light 25 of cross laser bundle just in time mark 7 with the isoceles triangle centering of seaming chuck 3 overlaps, and make vertical beam of light 25 and the rhombus centering on lower support beam 1 mark 6, axis of symmetry that isosceles triangle centering marks 7 overlaps completely, now seaming chuck 3 and lower support beam 1 entirely on the center; Horizontal laser beam 26 is penetrated on lower rod 13 of undersetting 2, is overlapped the lower edge of the side of sample 5 with horizontal laser beam 26, and now sample 5 is vertical with lower rod 13; Make vertical beam of light 25 by the crack tip of sample 5 sample 5 left and right adjusting again, ensure that sample 5 is in the center of pilot system.After completing operation above, the specimen clamping requirement of Fatigue Cracking Test can be ensured.
The present invention implements in detection institute's mechanics room, and by the inspection of practice, the raising of this invention to notched three-point bending fracture test accuracy is fairly obvious, is specially adapted to the test method with flexibility method test sample crack length.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (4)
1. the three point bending test device with laser centring device, is characterized in that: comprise lower support beam, seaming chuck, two undersettings be placed on lower support beam, the laser centring device that is connected with seaming chuck; Two undersettings lay respectively at the both sides of the center line of lower support beam, and equal to the distance of center line;
The top of described lower support beam is provided with matrix chute, and the end face of lower support beam and the center line of side are provided with multiple rhombus and/or isosceles triangle centering mark, and the axis of symmetry marked in all rhombuses or triangle pair is on same straight line;
The center line of the side of described seaming chuck is provided with multiple rhombus and/or isosceles triangle centering mark, and the axis of symmetry of all rhombuses or isosceles triangle centering mark is on same straight line;
Described undersetting comprises back-moving spring, is respectively equipped with the base of hangers and a lower roller, and the side of described base is provided with baffle plate, and the height of this baffle plate is less than the diameter of a lower roller; Described back-moving spring is connected with the hangers on base and lower roller respectively; Base to be connected with the slide block under base by tighting a bolt, and slide block can slide in the matrix chute on lower support beam;
Described laser centring device comprises cross line laser, the pivot arm be connected with cross line laser, the extension arm that is connected with seaming chuck, and described pivot arm is connected with extension arm by turning axle, and this pivot arm can rotate around turning axle.
2. the three point bending test device of band laser centring device according to claim 1, is characterized in that: described base and baffle plate as a whole.
3. the three point bending test device of band laser centring device according to claim 1, is characterized in that: the tie point of described extension arm and seaming chuck is positioned on the center line of the side of seaming chuck.
4. the three point bending test device of the band laser centring device according to claim 1 or 3, is characterized in that: the bottom of described seaming chuck is circular arc block.
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| CN201510851373.4A CN105300810B (en) | 2015-11-27 | 2015-11-27 | A kind of three point bending test device with laser centring device |
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| CN201510851373.4A CN105300810B (en) | 2015-11-27 | 2015-11-27 | A kind of three point bending test device with laser centring device |
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| CN105738205A (en) * | 2016-03-29 | 2016-07-06 | 河南省特种设备安全检测研究院 | Test device for crane girder |
| CN105784470A (en) * | 2016-04-10 | 2016-07-20 | 济南天辰试验机制造有限公司 | 180-degree bending test fixture |
| CN105891009A (en) * | 2016-05-06 | 2016-08-24 | 中国人民解放军国防科学技术大学 | Biological bone small-dimensional sample three-point bending test device |
| CN106885728A (en) * | 2017-02-14 | 2017-06-23 | 山东省医疗器械产品质量检验中心 | The fixture and method determined for bone plate bending strength and equivalent bending stiffness |
| CN107132130A (en) * | 2017-06-14 | 2017-09-05 | 黄河科技学院 | A kind of 3 points, four-point bending test machine adjusts fixture with centering |
| CN107144464A (en) * | 2017-06-19 | 2017-09-08 | 深圳市蓝丝腾科技有限公司 | Aircraft sylphon seal pressure test fixture |
| CN107976362A (en) * | 2017-12-20 | 2018-05-01 | 上海交通大学 | three-point bending fixture |
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| CN109580384A (en) * | 2019-01-24 | 2019-04-05 | 中汽研（天津）汽车工程研究院有限公司 | A kind of side door beams three-point bend test device |
| CN109855957A (en) * | 2019-04-03 | 2019-06-07 | 四川大学 | A kind of rock three-point bending fixture for dimensional effect test |
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| CN105738205A (en) * | 2016-03-29 | 2016-07-06 | 河南省特种设备安全检测研究院 | Test device for crane girder |
| CN105784470A (en) * | 2016-04-10 | 2016-07-20 | 济南天辰试验机制造有限公司 | 180-degree bending test fixture |
| CN105891009B (en) * | 2016-05-06 | 2018-06-12 | 中国人民解放军国防科学技术大学 | A kind of biology bone small size samples three point bending test device |
| CN105891009A (en) * | 2016-05-06 | 2016-08-24 | 中国人民解放军国防科学技术大学 | Biological bone small-dimensional sample three-point bending test device |
| CN106885728A (en) * | 2017-02-14 | 2017-06-23 | 山东省医疗器械产品质量检验中心 | The fixture and method determined for bone plate bending strength and equivalent bending stiffness |
| CN107132130A (en) * | 2017-06-14 | 2017-09-05 | 黄河科技学院 | A kind of 3 points, four-point bending test machine adjusts fixture with centering |
| CN107144464A (en) * | 2017-06-19 | 2017-09-08 | 深圳市蓝丝腾科技有限公司 | Aircraft sylphon seal pressure test fixture |
| CN107976362A (en) * | 2017-12-20 | 2018-05-01 | 上海交通大学 | three-point bending fixture |
| CN108627390A (en) * | 2018-03-23 | 2018-10-09 | 武汉理工大学 | A kind of multifunctional adjustable pressure fatigue machine connector device |
| CN108627390B (en) * | 2018-03-23 | 2020-04-21 | 武汉理工大学 | Connector device of multifunctional adjustable pressure fatigue machine |
| CN109580384A (en) * | 2019-01-24 | 2019-04-05 | 中汽研（天津）汽车工程研究院有限公司 | A kind of side door beams three-point bend test device |
| CN109855957A (en) * | 2019-04-03 | 2019-06-07 | 四川大学 | A kind of rock three-point bending fixture for dimensional effect test |
| CN109855957B (en) * | 2019-04-03 | 2023-12-01 | 四川大学 | Rock three-point bending clamp for size effect test |
| CN110296903A (en) * | 2019-07-17 | 2019-10-01 | 山东省医疗器械产品质量检验中心 | Special-shaped bone plate Mechanics Performance Testing harness and test method |
| CN110926977A (en) * | 2019-12-11 | 2020-03-27 | 西南交通大学 | Vertical loading device with horizontal sliding function |
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