CN103353429B - A kind of Simple test-piece fatigue tester - Google Patents
A kind of Simple test-piece fatigue tester Download PDFInfo
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- CN103353429B CN103353429B CN201310256611.8A CN201310256611A CN103353429B CN 103353429 B CN103353429 B CN 103353429B CN 201310256611 A CN201310256611 A CN 201310256611A CN 103353429 B CN103353429 B CN 103353429B
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Abstract
A kind of Simple test-piece fatigue tester, relates to the technical field of fatigue test of materials device, particularly relates to the technical field of testing machine.Column of the present invention connects the lever beam parallel with base, base is arranged lower end slide rail, lower end slide rail is arranged lower end slide block, height adjustment mechanism is arranged in the top of lower end slide block, layout lower end, the top fixture of height bindiny mechanism; Layout upper end, the lower surface slide rail of lever beam, upper end slide rail is arranged upper end slide block, and upper end-fixture is arranged in the lower end of upper end slide block, arranges force cell between upper end-fixture and upper end slide block; Test specimen is arranged between upper end-fixture and lower end fixture; Base arranges interconnective reciprocating mechanism, motor away from the side of column, lever beam arranges screw rod away from one end of column, arranges groups of springs between screw rod and reciprocating mechanism, column is arranged the high frequency driver be connected with motor.Present invention achieves structure simple, cost is low, and is easy to the object of measurement.
Description
Technical field
The present invention relates to the technical field of fatigue test of materials device, particularly relate to the technical field of testing machine.
Background technology
The fatigue lifetime of material is one of basic foundation of carrying out intensity and life-span calculating to structure, generally carries out destructive test to obtain data fatigue lifetime of material to test specimen.For obtaining the equal life curve of material, need to carry out tens torture tests to test specimen, and consider the susceptibility of material to temperature, generally fatigue load cycle frequency should not be set very high, therefore carry out a test and often need several weeks, even the time of several years.Therefore torture test cost is not only relevant with test specimen relevant cost, and with the amortization charge tight association of testing machine, and traditional hydraulic servo testing machine cost reaches hundreds thousand of Renminbi even up to a million yuans, the integrated cost of fatigue test of materials is remained high.
Summary of the invention
It is simple that the object of the invention is to provide a kind of structure, and cost is low, and be easy to the Simple test-piece fatigue tester of measurement.
A kind of Simple test-piece fatigue tester, comprise L shape framework, described L shape framework comprises column, base, column connects the lever beam parallel with base, base is arranged lower end slide rail, lower end slide rail is arranged lower end slide block, height adjustment mechanism is arranged, layout lower end, the top fixture of height adjustment mechanism in the top of lower end slide block; Layout upper end, the lower surface slide rail of lever beam, upper end slide rail is arranged upper end slide block, and upper end-fixture is arranged in the lower end of upper end slide block, arranges force cell between upper end-fixture and upper end slide block; Test specimen is arranged between upper end-fixture and lower end fixture; Base arranges interconnective reciprocating mechanism, motor away from the side of column, lever beam arranges screw rod away from one end of column, arranges groups of springs between screw rod and reciprocating mechanism, column is arranged the high frequency driver be connected with motor.
Lever beam of the present invention is connected by Pivoting bearing with between column.
The present invention adopts technique scheme, and compared with prior art tool has the following advantages: the simple and easy fatigue tester of one provided by the invention, and structure is simple, and reliability is high, and cost is very cheap, is suitable for very much the fatigue test of materials of long-time unmanned maintenance.The configuration adjustment of the fatigue load of testing machine is also very direct, can change the amplitude of stress ratio R and load conveniently by chucking position and prestrain screw rod, just can direct calibration test machine after the elastic modulus obtaining material for test and size.The cost of a traditional servo-hydraulic testing machine is up to hundreds thousand of unit, and the integrated cost of testing machine of the present invention is less than 20,000 yuan, greatly can reduce the depreciable cost of material fatigue testing machine, based on low-cost test machine provided by the invention, the mode of operation that Multi-Machine Synchronous is tested can be adopted, and then can total testing time be greatly reduced.Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention.
In figure: 1, L shape framework, 2, lower end fixture, 3, height adjustment mechanism, 4, lower end slide block, 5, lower end slide rail, 6, test specimen, 7, groups of springs, 8, reciprocating mechanism, 9, motor, 10, high frequency driver, 11, Pivoting bearing, 12, lever beam, 13, upper end slide block, 14, upper end slide rail, 15, force cell, 16, upper end-fixture, 17, screw rod.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail:
As shown in Figure 1, a kind of Simple test-piece fatigue tester, it is characterized in that comprising L shape framework 1, described L shape framework 1 comprises column, base, column connects the lever beam 12 parallel with base, base is arranged lower end slide rail 5, lower end slide rail 5 is arranged lower end slide block 4, height adjustment mechanism 3 is arranged, layout lower end, the top fixture 2 of height adjustment mechanism 3 in the top of lower end slide block 4; Layout upper end, the lower surface slide rail 14 of lever beam 12, upper end slide rail 14 is arranged upper end slide block 13, and upper end-fixture 16 is arranged in the lower end of upper end slide block 13, arranges force cell 15 between upper end-fixture 16 and upper end slide block 13; Test specimen 6 is arranged between upper end-fixture 16 and lower end fixture 2; Base arranges interconnective reciprocating mechanism 8, motor 9 away from the side of column, lever beam 12 arranges screw rod 17 away from one end of column, arrange groups of springs 7 between screw rod 17 and reciprocating mechanism 8, column is arranged the high frequency driver 10 be connected with motor 9.
As shown in Figure 1, lever beam 12 of the present invention is connected by Pivoting bearing 11 with between column.
The present invention by change fixture connect slide block position adjust the amplitude size of cyclic loading.The length that the present invention changes screw rod can control the original upload size of cyclic loading, and original upload power is produced by groups of springs.The cyclic loading of demand of the present invention is linked by motor and reciprocating mechanism and produces.
The mechanism that the present invention produces cyclic loading is made up of a series of groups of springs, reciprocating mechanism and motor can being compressed (or stretching), these camber of springs produce power act on lever beam by reciprocating mechanism, lever beam further by dynamic changes process on fixture.
Upper lower clamp of the present invention changes to the horizontal range of lever beam fulcrum by the slide block on shifting sledge.Size and this distance of the power on test specimen are inversely proportional to, because utilizing the size of the position control cyclic loading of fixture before this.
The present invention is after test specimen installs, and the minimum load in load cycle is produced by the spring being in compression or extended state, and they have the threaded rod of right-hand thread and left-hand thread and nut to control by two covers respectively.When stress ratio 0<R<1 (La-La circulates), two screw rods should according to mutual away from direction adjustment, now precompression is produced to spring.For R>1 (pressure-pressure circulation), screw rod then by direction close to each other adjustment, makes spring be in the state of being stretched like this.Prestrain can directly be obtained by force cell measurement.
Prestrain stress σ on test specimen
in advancedirect ratio is moved into, namely screw displacement value x with the initial position of loading system
p, be multiplied by spring constant k and Leveraged rate P:
σ
in advance≈ kPx
p(1)
Compression (or stretching) the displacement d of groups of springs is added consideration, the impulsive load σ suffered by test specimen can be obtained:
σ≈kP(d+x
p)(2)
In above formula, Leveraged rate P is loading spring and the fixture ratio to the horizontal range of Pivoting bearing.Compression (or stretching) the displacement d of groups of springs is the instantaneous deformation displacement of spring in testing machine duty.Screw displacement value x
prole of delegate is intended to displacement when applying minimum load on spring.
Screw displacement value x
pcan determine with by two parameters: stress ratio R, compression (or stretching) the displacement d of the groups of springs that screw displacement causes.Screw displacement value x
pcan be derived by following formula and obtain, wherein test piece deformation can be ignored:
In above formula, stress ratio R is minimum load σ suffered by test specimen in process of the test
minwith maximum load σ
maxratio.
(3) are substituted into formula (2) impulsive load σ suffered by test specimen can be obtained:
Above formula shows that the load on test specimen depends on stress ratio, Leveraged rate, the elastic constant of spring, the displacement of specimen stiffness and system.
If magnitude of load suffered by test specimen cannot meet test demand, the number of springs that can change groups of springs significantly changes load suffered by test specimen, and the accurate adjustment of load realizes by changing the position of fixture on slide rail.
The displacement of driving spring compression/stretching is produced by motor drivening rod mechanism, and can generate sinusoidal cyclic loading, load frequency is controlled by variable frequency drives.
Complete the configuration of testing machine according to test demand after, make testing machine continuous firing until test specimen fatigure failure, by CYCLIC LOADING number of times and the corresponding stress curve of force cell record test specimen.
Claims (2)
1. a Simple test-piece fatigue tester, it is characterized in that: comprise L shape framework (1), described L shape framework (1) comprises column, base, column connects the lever beam (12) parallel with base, base is arranged lower end slide rail (5), lower end slide rail (5) is upper arranges lower end slide block (4), and height adjustment mechanism (3) is arranged, the layout lower end, top fixture (2) of height adjustment mechanism (3) in the top of lower end slide block (4); The layout upper end, lower surface slide rail (14) of lever beam (12), upper end slide rail (14) is upper arranges upper end slide block (13), upper end-fixture (16) is arranged in the lower end of upper end slide block (13), arranges force cell (15) between upper end-fixture (16) and upper end slide block (13); Test specimen (6) is arranged between upper end-fixture (16) and lower end fixture (2); Base arranges interconnective reciprocating mechanism (8), motor (9) away from the side of column, lever beam (12) arranges screw rod (17) away from one end of column, arrange groups of springs (7) between screw rod (17) and reciprocating mechanism (8), column is arranged the high frequency driver (10) be connected with motor (9).
2. Simple test-piece fatigue tester according to claim 1, is characterized in that above-mentioned lever beam (12) is connected by Pivoting bearing (11) with between column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310256611.8A CN103353429B (en) | 2013-06-25 | 2013-06-25 | A kind of Simple test-piece fatigue tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310256611.8A CN103353429B (en) | 2013-06-25 | 2013-06-25 | A kind of Simple test-piece fatigue tester |
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| Publication Number | Publication Date |
|---|---|
| CN103353429A CN103353429A (en) | 2013-10-16 |
| CN103353429B true CN103353429B (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310256611.8A Expired - Fee Related CN103353429B (en) | 2013-06-25 | 2013-06-25 | A kind of Simple test-piece fatigue tester |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837420B (en) * | 2014-03-14 | 2016-06-29 | 唐山轨道客车有限责任公司 | Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine |
| CN104034616B (en) * | 2014-05-29 | 2016-07-06 | 河海大学 | A kind of electromagnetic type suspension cable fatigue machine |
| CN104458116B (en) * | 2014-12-03 | 2017-01-04 | 沈阳工业大学 | A kind of triangular wave forcer and force detection system characteristic test method thereof |
| CN105424526A (en) * | 2015-12-29 | 2016-03-23 | 中国兵器科学研究院宁波分院 | Corrosion fatigue environment test device |
| CN106404401B (en) * | 2016-08-31 | 2019-04-09 | 北京精密机电控制设备研究所 | A kind of servo mechanism zero-bit lock test device and test method |
| CN107631946A (en) * | 2017-09-07 | 2018-01-26 | 河海大学 | A kind of testing machine pre-add power apparatus |
| CN110426300B (en) * | 2019-07-30 | 2020-03-31 | 南京兆能节能科技有限公司 | Spring fatigue test device and method |
| CN110646281B (en) * | 2019-09-10 | 2022-04-29 | 广西大学 | Tensile testing machine suitable for low cycle fatigue test |
| CN111578892B (en) * | 2020-04-13 | 2021-08-27 | 湖南省计量检测研究院 | Strain gauge calibration device and method based on hydraulic element driving |
| CN112393887A (en) * | 2020-10-28 | 2021-02-23 | 山西航天清华装备有限责任公司 | Light and small spring tensile test device |
| CN112985791A (en) * | 2021-02-09 | 2021-06-18 | 湖南三一塔式起重机械有限公司 | Fatigue endurance test device and test method for tower crane connecting piece |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB939310A (en) * | 1959-03-02 | 1963-10-09 | British Iron Steel Research | Improvements in or relating to fatigue testing machines |
| CN87210621U (en) * | 1987-10-09 | 1988-03-30 | 东北工学院 | Rotating bending fatigue tester with superimposed load |
| CN1414367A (en) * | 2001-10-27 | 2003-04-30 | 宋玉泉 | Lever type fixed load material testing machine |
| FR2918173A1 (en) * | 2007-06-28 | 2009-01-02 | Snecma Sa | Tensile fatigue or creep testing machine for cylindrical rod shaped test tube, has mobile elements moved between two positions in controlled manner in which totality of mass is carried in one position and supported in other position |
| CN102507349A (en) * | 2011-10-21 | 2012-06-20 | 南京航空航天大学 | Micro fatigue testing machine with variable displacement control |
| CN102914478A (en) * | 2012-10-30 | 2013-02-06 | 北京理工大学 | Spring-lever energy storage type fatigue tension test machine |
-
2013
- 2013-06-25 CN CN201310256611.8A patent/CN103353429B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB939310A (en) * | 1959-03-02 | 1963-10-09 | British Iron Steel Research | Improvements in or relating to fatigue testing machines |
| CN87210621U (en) * | 1987-10-09 | 1988-03-30 | 东北工学院 | Rotating bending fatigue tester with superimposed load |
| CN1414367A (en) * | 2001-10-27 | 2003-04-30 | 宋玉泉 | Lever type fixed load material testing machine |
| FR2918173A1 (en) * | 2007-06-28 | 2009-01-02 | Snecma Sa | Tensile fatigue or creep testing machine for cylindrical rod shaped test tube, has mobile elements moved between two positions in controlled manner in which totality of mass is carried in one position and supported in other position |
| CN102507349A (en) * | 2011-10-21 | 2012-06-20 | 南京航空航天大学 | Micro fatigue testing machine with variable displacement control |
| CN102914478A (en) * | 2012-10-30 | 2013-02-06 | 北京理工大学 | Spring-lever energy storage type fatigue tension test machine |
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| CN103353429A (en) | 2013-10-16 |
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