CN1274840A - Automatically loading small-force test equipment with elastic pressure head - Google Patents
Automatically loading small-force test equipment with elastic pressure head Download PDFInfo
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- CN1274840A CN1274840A CN 99106542 CN99106542A CN1274840A CN 1274840 A CN1274840 A CN 1274840A CN 99106542 CN99106542 CN 99106542 CN 99106542 A CN99106542 A CN 99106542A CN 1274840 A CN1274840 A CN 1274840A
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- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 230000003028 elevating effect Effects 0.000 claims abstract description 12
- 238000006073 displacement reaction Methods 0.000 abstract description 12
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 229910003460 diamond Inorganic materials 0.000 description 8
- 239000010432 diamond Substances 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The test equipment consists of base, upright, transom, controlled motor, elevating lead screw, elastic pressure head, force sensor, sample supporting disc, sample, real-time video camera system, control card, A/D card, image card and computer. Substituting rigid pressure head with a elastic one to control directly the loading speed in test can simplify structure and lower cost. The loading speed may be set before test and the sample breaking time may be controlled and regulated conveniently, and this lowers the requirement to the speed of pressure head and obtains the displacement of force applying point easily.
Description
The present invention relates to a kind of automatically loading small-force test, be applicable to this class high degree of brittleness material mensuration fracture toughness of pottery and man-made diamond film K with elastic press head
ICAnd bending strength σ
bAutomatic load test occasion.
The various test units in existing home and abroad comprise this class high degree of brittleness material mensuration fracture toughness of pottery and man-made diamond film K
ICAnd bending strength σ
bTest unit, all adopt the rigid pressure head.During to the sample imposed load, the distortion of manometric head itself is very small to this rigid pressure head at it, so that its deflection of generally can ignoring.Such rigid pressure head is used for this class high degree of brittleness material of pottery and man-made diamond film and measures fracture toughness K
ICAnd bending strength σ
bAutomatic load testing machine the time, have a very big problem.Because no matter pottery and this class high degree of brittleness material of man-made diamond film measure its fracture toughness K with 3 curved samples
IC, still measure its bending strength σ
b, consider the processing and the factors such as price of material, the size of this class sample is all very little, with the diamond film is example, thick being about of the high X of long X of general sample: 10X2X0.25 (mmXmmXmm), therefore, its destructive power value is also very little, generally is about tens or tens newton (N).For the test unit of this class rigid pressure head, in order to record small value force, general loading velocity must be chosen very for a short time, and when ceramic bending test was loaded, the translational speed of manometric head was not more than 0.05mm/min when general restriction loaded.According to the different elastic modulus of diamond film and pottery, the situation of analogy pottery, when the diamond film bending test was loaded, the translational speed of manometric head was not more than 0.013mm/min in the time of should limiting loading.The velocity of displacement that as seen will reach above-mentioned manometric head easily is very difficult.Now, even if reached above-mentioned velocity of displacement, still have problems.What problem which is again? because to pottery and this class high degree of brittleness material of diamond film, its elastic modulus is high, be about: 300-1150GPa, contact sample to breaking at the rigid pressure head, the rigid pressure head is minimum with respect to the displacement of sample, therefore, only several seconds of loading procedure or less than 1 second.The test unit of this use rigid pressure head obviously for the fracture process of this class material of observation, is surveyed accurate disruptive force value, all can bring expensively or unsuccessful, and can't realize loading velocity control, the shift value of the point of application in the time of can't measuring test.
The objective of the invention is to overcome the shortcoming of prior art, propose a kind of with the power value as the control parameter, rational in infrastructure, installation cost is low, detect dependable performance, the automatically loading small-force test of the band elastic press head of point of application shift value in the time of can measuring test easily.
A kind of automatically loading small-force test with elastic press head, comprise base 1, column 2, crossbeam 3, controlled motor 4, elevating screw 5, elastic press head 6, force transducer 7, sample step disk 8, sample 9, real-time pickup system 10, control card 11, A/D card 12, image card 13 and computing machine 14, it is characterized in that: elastic press head 6 links to each other with elevating screw 5, force transducer 7 is arranged on the base 1, elastic press head 6 is by manometric head 61, connect sheath 62, two set nuts 63, manometric head body 64, slip cap 65, spring 66 and little axle 67 are formed, force transducer 7 links to each other with computing machine 14 by A/D card 12, controlled motor 4 links to each other with computing machine 14 by control card 11, and pickup system 10 blocks 13 by image and links to each other with computing machine 14 in real time.
Aforesaid a kind of automatically loading small-force test with elastic press head, it is characterized in that: the spring rate scope of spring 66 is 0.001N/mm to 1000N/mm, the spring altitude range of spring 66 is 1mm to 1000mm, and the spring spring coil radius of spring 66 is 1mm to 1000mm.
Advantage of the present invention is: the first, owing to replace original rigid pressure head with elastic press head, the control parameter of the power value of measuring with the high-precision force sensor during as test, replaced originally controlling parameter as test with displacement, that is adopted directly and tested with loading velocity (dF/dt) control, various loading velocities can be set before test, convenient and accurate, help under various loading velocities, the mechanical property of material is made correct evaluation; The second, owing to adopted directly with loading velocity (dF/dt) control and tested, make sample from stressed to disrumpent feelings time Be Controlled and adjustment easily, help the overall process of observing sample disrumpent feelings, reduce the expense of observation, record device therefor greatly; Three, test with loading velocity (dF/dt) control owing to having adopted directly, relaxed velocity of displacement requirement, thereby simplified the structure of device, reduced cost pressure head.Four, owing to adopted elastic press head, test the shift value of the point of application in the time of to draw test easily with loading velocity (dF/dt) control.
Accompanying drawing 1 is a shape assumption diagram of the present invention.
Accompanying drawing 2 is the structural drawing of elastic press head 6 of the present invention.
Wherein: 1-base, 2-column, 3-crossbeam, 4-controlled motor, the 5-elevating screw, 6-elastic press head, 7-force transducer, 8-sample step disk, the 9-sample, the real-time pickup system of 10-, 11-control card, 12-A/D card, 13-image card, 14-computing machine, 61-manometric head, 62-connects sheath, 63-set nut, 64-manometric head body, the 65-slip cap, 66-spring, the little axle of 67-.
Below in conjunction with accompanying drawing, embodiment of the present invention and principle of work are made a detailed description.
As shown in Figure 1.The present invention is made up of base 1, column 2, crossbeam 3, controlled motor 4, elevating screw 5, elastic press head 6, force transducer 7, sample step disk 8, sample 9, real-time pickup system 10, control card 11, A/D card 12, image card 13 and computing machine 14.As shown in Figure 2 elastic press head 6 by manometric head 61, connect sheath 62, two set nuts 63, manometric head body 64, slip cap 65, spring 66 and little axles 67 are formed.
Describe earlier elastic press head 6 by process of assembling.As shown in Figure 2, in by this elastic press head 6 of dress, earlier spring 66 is placed on the little axle 67 that has spring base, refills slip cap 65, and regulate two set nuts 63, make spring 66 give tight amount.Then, the little axle 67 that spring 66, slip cap 65 and two set nuts 63 are housed is loaded in the manometric head body 64.In manometric head body 64, put into manometric head 61 again, and tighten connection sheath 62 in the end of manometric head body 64.Whole like this elastic press head 6 has been finished by dress.Again elastic press head 6 is loaded on the elevating screw.
The principle of work of elastic press head 6 is once described now.As shown in Figure 2, other part of the key of elastic press head 6 is a spring 66.The spring rate of now setting elastic press head 6 is K, such as, get K=10N/mm.When touching sample 9, manometric head 61 produces pressure F, the stressed F that should be on the spring 66 at this moment
s, its value is
F
s=F-f (a) and stressed F on the spring
sCan be expressed as again
F
sIn last two formulas of=K Δ (b):
Friction force and slip cap between f-manometric head 61 and manometric head body 64 inwalls
65 and little axle outside surface between the friction force sum;
The decrement of Δ-spring 66 (disregard and give decrement), i.e. manometric head 61 and manometric head
Relative shift between the body 64.During device work, minimum as sample deformation,
Then the Δ value is the displacement of elevating screw 5.
Stressed F on the sample 9 directly passes through force transducer 7 and A/D card 12 to computing machine 14, directly demonstrates the F value on the screen of computing machine 14.Because therefore the constant that friction force f under the constant condition of elevating screw 5 movement velocitys, can be considered and the time is irrelevant has
DF/dt=dF
s/ dt (c) considers that simultaneously formula (b) then has
DF/dt=Kd Δ/dt (d) is if the stress value on the sample 9 reaches the maximum, force value F of this elastic press head
MAXThe time, manometric head 61 touches with being coupling for a short time, and spring 66 just can further not produce distortion again.Elastic press head 6 is designed to different specifications according to the maximum, force value, selects for use very convenient.
A kind of principle of work of the automatically loading small-force test with elastic press head is described now.As shown in Figure 1, with sample 9 by being loaded on the sample step disk 8, rapid adjustment elevating screw 5 makes elastic press head 6 apart from about the about 1mm of the upper surface of sample 9, and as loading by the loading velocity of dF/dt=1N/s, then the computing machine movement velocity of choosing elevating screw 5 automatically by formula (d) is
dΔ/dt＝(dF/dt)/K＝(1N/s)/(10N/mm)
Automatically provide the F-t curve on the=0.1mm/s=6mm/min computer screen, i.e. stressed the and time relation curve of sample 9.
About the work of real-time photography system 10, videotape automatically by the computing machine overall process, from spring pressure head 6 soon contact with sample 9, contact, until breaking.Owing to adopted loading velocity control, 9 Fracture Force is if materials: 20N, and load by the loading velocity of dF/dt=1N/s, then contact with sample 9 to breaking and to last nearly 20 seconds from spring pressure head 6, can gather, store the figure of this fracture overall process easily, so that anatomize research after the test.
Displacement about the point of application.The displacement in facility force is w, in a kind of automatically loading small-force test with elastic press head of the present invention, can be calculated by following formula
w
j＝(t
j-t
i)(dΔ/dt)-(F
j-F
i)/K (e)
F in the formula
iA certain starting force value of getting of-force transducer 7,
t
i-with F
iThe corresponding time,
t
j-at t
iIt is sometime later,
F
j-force transducer 7 and t
jCorresponding power value.The physical significance of formula (e) is: the displacement w of the point of application promptly at one time in, the difference of the decline displacement of elevating screw 5 and the decrement of spring.The power output value of the force transducer 7 of computer-automatic collection time and each corresponding time, by formula (e) calculates the displacement w value of the point of application, and dynamically shows the w-t curve on computing machine 14 screens.
Claims (2)
1, a kind of automatically loading small-force test with elastic press head, comprise base (1), column (2), crossbeam (3), controlled motor (4), elevating screw (5), elastic press head (6), force transducer (7), sample step disk (8), sample (9), real-time pickup system (10), control card (11), A/D card (12), image card (13) and computing machine (14), it is characterized in that: elastic press head (6) links to each other with elevating screw (5), force transducer (7) is arranged on the base (1), elastic press head (6) is by manometric head (61), connect sheath (62), two set nuts (63), manometric head body (64), slip cap (65), spring (66) and little axle (67) are formed, force transducer (7) links to each other with computing machine (14) by A/D card (12), controlled motor (4) links to each other with computing machine by control card (11), and pickup system (10) links to each other with computing machine by image card (13) in real time.
2, according to claims 1 described a kind of automatically loading small-force test with elastic press head, it is characterized in that: the spring rate scope of spring (66) is 0.001N/mm to 1000N/mm, the spring altitude range of spring (66) is 1mm to 1000mm, and the spring spring coil radius of spring (66) is 1mm to 1000mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99106542 CN1274840A (en) | 1999-05-21 | 1999-05-21 | Automatically loading small-force test equipment with elastic pressure head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99106542 CN1274840A (en) | 1999-05-21 | 1999-05-21 | Automatically loading small-force test equipment with elastic pressure head |
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| Publication Number | Publication Date |
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| CN1274840A true CN1274840A (en) | 2000-11-29 |
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| CN 99106542 Pending CN1274840A (en) | 1999-05-21 | 1999-05-21 | Automatically loading small-force test equipment with elastic pressure head |
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| CN1793873B (en) * | 2005-12-23 | 2010-04-28 | 成都理工大学 | Automatic sampling and testing system of on-line X fluorescence analysis |
| CN1811374B (en) * | 2005-01-04 | 2010-05-12 | 洛萨瓦拉-基鲁纳瓦拉公司 | Arrangement and method for the analysis of the strength of a specimen of reducible material that contains iron |
| CN101793653A (en) * | 2010-02-11 | 2010-08-04 | 上海交通大学 | Automatic loading device of stress ring |
| CN101833039A (en) * | 2010-04-30 | 2010-09-15 | 河海大学常州校区 | Pressure device of contact resistance measuring system |
| CN101832804A (en) * | 2010-04-22 | 2010-09-15 | 常州市易用科技有限公司 | Oil-water metering instrument |
| CN101509831B (en) * | 2009-01-20 | 2010-10-27 | 深圳市蓝韵实业有限公司 | Motor test platform |
| CN1896711B (en) * | 2005-01-04 | 2011-08-17 | 洛萨瓦拉-基鲁纳瓦拉公司 | Method for the analysis of a test specimen of reducible material that contains iron |
| CN103954414A (en) * | 2014-03-13 | 2014-07-30 | 日照裕鑫动力有限公司 | Upper pin reed digital display type elasticity measure apparatus and method thereof |
| CN103994929A (en) * | 2014-06-18 | 2014-08-20 | 哈尔滨工业大学 | Mechanical property testing device and method for testing mechanical property of micro-component by device |
| CN105651640A (en) * | 2016-03-25 | 2016-06-08 | 常州市计量测试技术研究所 | Full-automatic detection device of Shore durometer and method thereof |
| CN106908313A (en) * | 2017-04-13 | 2017-06-30 | 西安交通大学 | The small load control system of big load testing machine and control method |
| CN107991109A (en) * | 2018-01-22 | 2018-05-04 | 中国重型机械研究院股份公司 | A kind of power of tire and brake test table radial loaded mechanism |
| CN109696211A (en) * | 2019-03-01 | 2019-04-30 | 南京航空航天大学 | Ultrasound electric machine becomes pre-pressure loading device and testing mechanical characteristic platform |
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1999
- 1999-05-21 CN CN 99106542 patent/CN1274840A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1811374B (en) * | 2005-01-04 | 2010-05-12 | 洛萨瓦拉-基鲁纳瓦拉公司 | Arrangement and method for the analysis of the strength of a specimen of reducible material that contains iron |
| CN1896711B (en) * | 2005-01-04 | 2011-08-17 | 洛萨瓦拉-基鲁纳瓦拉公司 | Method for the analysis of a test specimen of reducible material that contains iron |
| CN1793873B (en) * | 2005-12-23 | 2010-04-28 | 成都理工大学 | Automatic sampling and testing system of on-line X fluorescence analysis |
| CN101509831B (en) * | 2009-01-20 | 2010-10-27 | 深圳市蓝韵实业有限公司 | Motor test platform |
| CN101793653A (en) * | 2010-02-11 | 2010-08-04 | 上海交通大学 | Automatic loading device of stress ring |
| CN101793653B (en) * | 2010-02-11 | 2011-11-16 | 上海交通大学 | Automatic loading device of stress ring |
| CN101832804A (en) * | 2010-04-22 | 2010-09-15 | 常州市易用科技有限公司 | Oil-water metering instrument |
| CN101832804B (en) * | 2010-04-22 | 2012-04-04 | 常州市易用科技有限公司 | Oil-water metering instrument |
| CN101833039A (en) * | 2010-04-30 | 2010-09-15 | 河海大学常州校区 | Pressure device of contact resistance measuring system |
| CN101833039B (en) * | 2010-04-30 | 2012-08-29 | 河海大学常州校区 | Pressure device of contact resistance measuring system |
| CN103954414A (en) * | 2014-03-13 | 2014-07-30 | 日照裕鑫动力有限公司 | Upper pin reed digital display type elasticity measure apparatus and method thereof |
| CN103954414B (en) * | 2014-03-13 | 2017-01-04 | 日照裕鑫动力有限公司 | The measuring method of upper dog chart digital display type elasticity measuring device |
| CN103994929A (en) * | 2014-06-18 | 2014-08-20 | 哈尔滨工业大学 | Mechanical property testing device and method for testing mechanical property of micro-component by device |
| CN105651640A (en) * | 2016-03-25 | 2016-06-08 | 常州市计量测试技术研究所 | Full-automatic detection device of Shore durometer and method thereof |
| CN105651640B (en) * | 2016-03-25 | 2019-05-21 | 常州市计量测试技术研究所 | A kind of full-automatic calibrating installation of Shore durometer and method |
| CN106908313A (en) * | 2017-04-13 | 2017-06-30 | 西安交通大学 | The small load control system of big load testing machine and control method |
| CN106908313B (en) * | 2017-04-13 | 2019-06-04 | 西安交通大学 | The small load control system of big load testing machine and control method |
| CN110023735A (en) * | 2017-09-07 | 2019-07-16 | 株式会社Lg化学 | For assessing the brittle device and method of electrode |
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| CN110023735B (en) * | 2017-09-07 | 2021-09-14 | 株式会社Lg化学 | Apparatus and method for assessing brittleness of an electrode |
| CN107991109A (en) * | 2018-01-22 | 2018-05-04 | 中国重型机械研究院股份公司 | A kind of power of tire and brake test table radial loaded mechanism |
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