CN103837420B - Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine - Google Patents
Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine Download PDFInfo
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- CN103837420B CN103837420B CN201410095877.3A CN201410095877A CN103837420B CN 103837420 B CN103837420 B CN 103837420B CN 201410095877 A CN201410095877 A CN 201410095877A CN 103837420 B CN103837420 B CN 103837420B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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Abstract
The present invention provides a kind of pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine, including support column fixing on force transmitting board and work platforms, the predetermined patterns of force transmitting board and support column are articulated and connected, and the two ends of force transmitting board can swing up and down around support column；One end of force transmitting board and work platforms are respectively arranged with fixture, for connecting the two ends of workpiece to be tensioned, the other end of force transmitting board is provided with actuator, so that when one end of force transmitting board is applied active force by actuator under control of the control system, the other end of force transmitting board is treated stretched part and is stretched.Pulse fatigue testing machine fatigue experimental device provided by the invention and pulse fatigue testing machine, it is possible to carry out the tensile fatigue test of small sample, be applied on pulse fatigue testing machine, it is possible to expand testing pulse fatigue and trial stretch.
Description
Technical field
The present invention relates to the fatigue test technology of component of machine, particularly relate to a kind of pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine.
Background technology
In modern industry, burn into fracture and abrasion are machine components and the main cause of engineering component damage inactivation, and wherein corrosion and abrasion process are slow, by regularly replacing part or can be periodically subject to repairing and avoid damage to, and rupture and usually occur suddenly, and unpredictable.Cause the reason that parts rupture a lot, such as overload, black brittleness, hydrogen embrittlement, stress corrosion and fatigue, and engineering practice shows that the overwhelming majority is all caused by fatigue.
Therefore, for avoiding parts to damage because of fatigue fracture, the new equipment designed carried out strength check or the equipment in running is carried out when strength check, all needing test parts fatigue behaviour under different alternate stress effects.
In prior art, the common equipment carrying out fatigue test has hydraulic pulsation fatigue machine, but pulse fatigue testing machine is only used for various relatively large parts and structure are carried out unidirectional pulsating compression or repeated bend test, and the tensile fatigue test of small sample can not be realized, trial stretch is very limited.
Summary of the invention
The present invention provides a kind of pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine, it is possible to carry out the tensile fatigue test of small sample, expands the trial stretch of pulse fatigue testing machine.
The present invention provides a kind of pulse fatigue testing machine fatigue experimental device, including support column fixing on force transmitting board and work platforms, the predetermined patterns of described force transmitting board and described support column are articulated and connected, and the two ends of described force transmitting board can swing up and down around described support column；
One end of described force transmitting board and described work platforms are respectively arranged with fixture, for connecting the two ends of workpiece to be tensioned, the other end of described force transmitting board is provided with actuator, so that when one end of described force transmitting board is applied active force by described actuator under control of the control system, described workpiece to be tensioned is stretched by the other end of described force transmitting board.
The present invention also provides for a kind of pulse fatigue testing machine, including pulse fatigue testing machine fatigue experimental device as above
Pulse fatigue testing machine fatigue experimental device provided by the invention and pulse fatigue testing machine, by arranging force transmitting board and the support column being articulated and connected with force transmitting board, so that when actuator acts on one end of force transmitting board, the workpiece of the force transmitting board other end can be carried out tension test, this device can carry out the tensile fatigue test of small sample, be applied on pulse fatigue testing machine, it is possible to expand testing pulse fatigue and trial stretch.
Accompanying drawing explanation
Fig. 1 is the structural representation of pulse fatigue testing machine fatigue experimental device of the present invention；
Fig. 2 is A place enlarged drawing in Fig. 1；
Fig. 3 is the structural representation of force transmitting board in pulse fatigue testing machine fatigue experimental device of the present invention；
Fig. 4 is the structural representation arranging support column in pulse fatigue testing machine fatigue experimental device of the present invention on work platforms；
Fig. 5 is the structural representation of fixture in pulse fatigue testing machine fatigue experimental device of the present invention；
Fig. 6 is the structural representation of oscillating bearing in pulse fatigue testing machine fatigue experimental device of the present invention；
Fig. 7 is oscillating bearing scheme of installation on force transmitting board in pulse fatigue testing machine fatigue experimental device of the present invention.
Detailed description of the invention
The embodiment of the present invention provides a kind of pulse fatigue testing machine fatigue experimental device, as shown in Figure 1, this fatigue experimental device includes support column 2 fixing on force transmitting board 1 and work platforms 3, the predetermined patterns of force transmitting board 1 and support column 2 are articulated and connected, and the two ends of force transmitting board 1 can swing up and down around support column 2；One end of force transmitting board 1 and work platforms 3 are respectively arranged with fixture, for connecting the two ends of workpiece to be tensioned, the other end of force transmitting board 1 is provided with actuator 4, so that when one end of force transmitting board 1 is applied active force by actuator 4 under control of the control system, described workpiece to be tensioned is stretched by the other end of described force transmitting board.
Wherein, force transmitting board 1 is realize the transmission to power and conversion in this role, and actuator 4 is applied to the downward pressure transmission of force transmitting board 1 one end to the other end, is converted to the tensile force to workpiece, thus workpiece can be carried out tensile fatigue test.
The for the benefit of transmission of power and conversion, require force transmitting board 1 transmission power under the premise that minimum deflection deformation (to be negligible as standard) occurs for test, therefore force transmitting board 1 needs select suitable material and design suitable length during fabrication, if the rigidity of selected materials material is too small, then in the transmittance process of power, force transmitting board itself can produce deflection deformation, can not transferring force to tensile test specimen place completely, therefore the stretching of test specimen is difficult to；If the length of force transmitting board is oversize, deflection deformation problem can be produced equally, be unfavorable for realizing the transmission of power.
In the present embodiment, force transmitting board 1 is articulated and connected with the support column 2 on work platforms 3, specifically as shown in Figures 3 and 4, predetermined patterns at force transmitting board 1 is provided with semi-cylindrical projection 11, support column 2 is provided with the semi-cylindrical recesses 21 coordinated with semi-cylindrical protruding 11, semi-cylindrical projection 11 is arranged in semi-cylindrical recesses 21, and semi-cylindrical protruding 11 is connected with the sidewall of semi-cylindrical recesses 21 both sides by bearing pin, realizes being articulated and connected of force transmitting board 1 and support column 2 with this.The present embodiment arranges semi-cylindrical protruding 11 on force transmitting board 1 and arranges semi-cylindrical recesses 21 on support column 2, is the assembling for the ease of force transmitting board 1 with support column 2, and in process of the test, is so more beneficial for the rotation of force transmitting board 1.
In force transmitting board 1 with support column 2 relative rotational motion, can there is wear problem, in order to reduce the contact wear between force transmitting board 1 and support column 2, the present embodiment is provided with ball between semi-cylindrical protruding 11 and the semi-cylindrical recesses 21 of support column 2 of force transmitting board 1, to reduce friction by ball, additionally, it is possible to adopt the mode of oil addition to reduce friction between semi-cylindrical protruding 11 and semi-cylindrical recesses 21.
Tensile fatigue performance for ease of test piece, force transmitting board 1 arranges the position of semi-cylindrical projection 11 and is arranged on the middle part of force transmitting board 1, the middle part making force transmitting board 1 is articulated and connected with supporting platform 2, so, the two ends of force transmitting board 1 distance apart from this middle part is identical, according to lever principle, the force value size at force transmitting board 1 two ends is identical, and the pressure that namely actuator 4 acts on force transmitting board 1 is identical with the tensile force suffered by workpiece.
In the present embodiment, on work platforms 3 and force transmitting board 1 connect one end of workpiece to be tensioned and be connected to fixture, as shown in Figure 2, force transmitting board 1 is connected to fixture 5, work platforms 3 is connected to lower clamp 5 ', the two ends of workpiece 7 to be tensioned grip respectively through upper fixture 5 and lower clamp 5 ', wherein, upper fixture 5 and lower clamp 5 ' structure in the present embodiment are identical, it is plate tensile sample fixture, as shown in Figure 5, upper fixture 5 specifically includes clamping part 51 and connecting portion 52, clamping part 51 is used for clamping plate tensile sample, connecting portion 52 is for being connected to predeterminated position by this fixture, certainly, fatigue test in the present embodiment is not limited to the test of plate workpiece, also can test shaft-like sample etc., therefore, upper fixture 5 and lower clamp 5 ' are not limited to plate tensile sample fixture, it can be also shaft-like specimen holder etc., specifically can select suitable fixture according to the type of workpiece.The material of upper fixture 5 and lower clamp 5 ' can be selected for quality carbon tool steel, has good plasticity and intensity, it is possible to bear vibration and shock loading, and hardness is moderate, has bigger toughness.
In the present embodiment, between force transmitting board 1 and the fixture being connected, between work platforms 3 and the fixture 5 being connected, it is respectively arranged with oscillating bearing.As in figure 2 it is shown, be provided with the first oscillating bearing 6 between force transmitting board 1 and upper fixture 5, between work platforms 3 and lower clamp 5 ', it is provided with second joint bearing 6 '.
According to Fig. 1, what it will be appreciated by those skilled in the art that the two of force transmitting board 1 end does is be a little the center of circle along being articulated and connected in fact, it is articulated and connected a little to the circular arc line motion that the distance of end points is radius, but the tensile fatigue test of workpiece requires that workpiece is subject to should be the tensile force along workpiece, therefore the present embodiment have employed a pair oscillating bearing, one of them is assemblied in force transmitting board 1 and connects one end of workpiece to be tensioned, i.e. the first oscillating bearing 6, another is assemblied on work platforms 3, i.e. second joint bearing 6 ', the structure of the first oscillating bearing 6 and second joint bearing 6 ' is as shown in Figure 6, include the threaded threaded post 62 arranged in spheroplast 61 and spheroplast 61, the connection of the first oscillating bearing 6 and force transmitting board 1 is ball recess 12(such as Fig. 3 and Fig. 7 by arranging on force transmitting board 1), spheroplast 61 is arranged in ball recess 12, and can in the interior 360 ° of rotations of ball recess 12, threaded post 62 is threadedly attached in fixture 5 (offering screwed hole on upper fixture 5), same, the second joint bearing 6 ' being arranged on work platforms 3 is connected with the ball recess (not shown) arranged on work platforms also by spheroplast 61, threaded post 62 and lower clamp 5 ' are threaded connection, owing to two oscillating bearings can realize the rotation of 360 °, so in process of the test, although movement in a curve is done in the end of force transmitting board 1, but still can ensure that simple extensional motion made by workpiece to be tensioned.
In the present embodiment, as shown in Figures 1 and 3, force transmitting board 1 arranges one end of actuator 4 pressure head and is provided with arcwall face structure 13, described arcuate structure 13 is provided with the arc-shaped curved surface of epirelief, this arc-shaped curved surface contacts with the pressure head of actuator 4, the tangent of end with actuator pressure head for realizing force transmitting board contacts, that is, when the pressure head of actuator 4 is pressed in the end of force transmitting board 1, the bottom surface of the pressure head of actuator 4 is tangent with the arc-shaped curved surface of force transmitting board 1 end, a point cantact with arc-shaped curved surface, the stable distance of this contact point distance middle hinge point of force transmitting board 1, it is thus possible to the stability of guarantee test.
Further, arcwall face structure 13 is specially semicylinder structure, and the arc-shaped curved surface in arcwall face structure 13 is the semi-cylindrical of semicylinder structure, and the top of semi-cylindrical contacts with the pressure head of actuator 4.The position arranging semicylinder structure on force transmitting board 1 is formed with jagged 13, so that when the pressure head of actuator 4 is pressed in the end of force transmitting board 1, it is possible to carry out point cantact with the top on the face of cylinder, rather than carries out face with the end of force transmitting board 1 and contact.
In the present embodiment, as shown in Figure 4, for convenience of assay device fixing on work platforms 3, work platforms 3 is provided with multiple inverted T shape groove 31, as support column 2, second joint bearing 6 ' etc. are fixed in inverted T shape groove 31, by inverted T shape groove 31 fixation test device, not only convenient fixing, and can be easy to change fixed position.
The pulse fatigue testing machine fatigue experimental device that the embodiment of the present invention provides, by arranging force transmitting board and the support column being articulated and connected with force transmitting board, so that when actuator acts on one end of force transmitting board, the workpiece of the force transmitting board other end can be carried out tension test, this device can carry out the tensile fatigue test of small sample, be applied on pulse fatigue testing machine, it is possible to expand testing pulse fatigue and trial stretch.
Another embodiment of the present invention also provides for a kind of pulse fatigue testing machine, includes the pulse fatigue testing machine testing pulse fatigue device that any embodiment of the present invention provides.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (5)
1. a pulse fatigue testing machine fatigue experimental device, it is characterized in that, including support column fixing on force transmitting board and work platforms, the predetermined patterns of described force transmitting board and described support column are articulated and connected, and the two ends of described force transmitting board can swing up and down around described support column, wherein, the predetermined patterns of described force transmitting board is provided with semi-cylindrical projection, described support column is provided with and the semi-cylindrical recesses of described semi-cylindrical male cooperation, described semi-cylindrical projection is arranged in described semi-cylindrical recesses, and described semi-cylindrical projects through bearing pin and is connected with described the side walls hinged of semi-cylindrical recesses both sides, described predetermined patterns is the middle part of described force transmitting board, the two ends of the described force transmitting board distance apart from described middle part is identical；
One end of described force transmitting board and described work platforms are respectively arranged with fixture, for connecting the two ends of workpiece to be tensioned, the other end of described force transmitting board is provided with actuator, so that when one end of described force transmitting board is applied active force by described actuator under control of the control system, described workpiece to be tensioned is stretched by the other end of described force transmitting board；
Described force transmitting board arranges one end of described actuator and is provided with arcwall face structure, described arcwall face structure is provided with the arc-shaped curved surface of epirelief, when the pressure head of described actuator is pressed in the end of described force transmitting board, the top of described arc-shaped curved surface is tangent with the pressure head of described actuator；
Between described force transmitting board and the fixture being connected, between described work platforms and the fixture being connected, it is respectively arranged with oscillating bearing.
2. pulse fatigue testing machine fatigue experimental device according to claim 1, it is characterised in that described semi-cylindrical is protruding and is provided with ball between described semi-cylindrical recesses.
3. pulse fatigue testing machine fatigue experimental device according to claim 2, it is characterised in that described arcwall face structure is semicylinder structure, described arc-shaped curved surface is the semi-cylindrical of described semicylinder structure.
4. pulse fatigue testing machine fatigue experimental device according to claim 1, it is characterised in that be provided with multiple inverted T shape groove, described support column and described oscillating bearing on described work platforms and be fixed in described inverted T shape groove.
5. a pulse fatigue testing machine, it is characterised in that include the arbitrary described pulse fatigue testing machine fatigue experimental device of claim 1-4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410095877.3A CN103837420B (en) | 2014-03-14 | 2014-03-14 | Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine |
| PCT/CN2014/090379 WO2015135329A1 (en) | 2014-03-14 | 2014-11-05 | Fatigue testing device for pulsation fatigue testing machine and pulsation fatigue testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410095877.3A CN103837420B (en) | 2014-03-14 | 2014-03-14 | Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine |
Publications (2)
| Publication Number | Publication Date |
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| CN103837420A CN103837420A (en) | 2014-06-04 |
| CN103837420B true CN103837420B (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410095877.3A Active CN103837420B (en) | 2014-03-14 | 2014-03-14 | Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine |
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| CN (1) | CN103837420B (en) |
| WO (1) | WO2015135329A1 (en) |
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| CN107091787B (en) * | 2017-01-10 | 2023-02-24 | 河南师范大学 | Fatigue testing machine |
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| CN111089812B (en) * | 2019-12-27 | 2024-07-19 | 浙江工业大学 | Multi-angle composite fretting corrosion test device and method |
| CN111678776B (en) * | 2020-04-24 | 2023-04-18 | 江苏禹治流域管理技术研究院有限公司 | Indirect stretching device for testing tensile strength of rock |
| CN112540013A (en) * | 2020-11-24 | 2021-03-23 | 西华大学 | Impact test device for rod-shaped anchoring assembly |
| CN112858052B (en) * | 2021-01-29 | 2022-05-03 | 北京工业大学 | Tensile fatigue test device for pulse fatigue compression testing machine |
| CN114235561A (en) * | 2021-12-17 | 2022-03-25 | 中国核动力研究设计院 | High-temperature fatigue test fixture and test method suitable for thin-wall cladding tube |
| CN115266346A (en) * | 2022-07-27 | 2022-11-01 | 重庆邮电大学 | Clamping device for fatigue test |
| CN118329596B (en) * | 2024-06-12 | 2024-09-27 | 深圳市鑫科拓威科技有限公司 | Performance testing device for carrier plate of high-strength adhesive |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696920A (en) * | 2009-10-27 | 2010-04-21 | 锦州万友机械部件有限公司 | Fatigue testing device for lateral dynamic bending of piston rod of vibration damper |
| CN102706570A (en) * | 2012-06-04 | 2012-10-03 | 唐山轨道客车有限责任公司 | Simulation test device for pneumatic load of vehicle body |
| CN102914478A (en) * | 2012-10-30 | 2013-02-06 | 北京理工大学 | Spring-lever energy storage type fatigue tension test machine |
| CN103353429A (en) * | 2013-06-25 | 2013-10-16 | 南京航空航天大学 | Simple test-piece fatigue testing machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035473U (en) * | 1988-10-05 | 1989-04-05 | 中国科学院兰州化学物理所 | Loading device for testing machine |
| US8210051B2 (en) * | 2004-12-03 | 2012-07-03 | General Electric Company | System and method for cyclic testing |
| US8413521B2 (en) * | 2011-03-22 | 2013-04-09 | General Electric Company | Apparatus and method for over-peak loading for creep-rupture testing |
| CN102539257B (en) * | 2011-11-15 | 2015-07-08 | 中国商用飞机有限责任公司 | Device for measuring high-low temperature durability of sealing element |
| CN202974781U (en) * | 2012-12-24 | 2013-06-05 | 重庆科技学院 | Lever-type rock tensile compressive rheological tester |
-
2014
- 2014-03-14 CN CN201410095877.3A patent/CN103837420B/en active Active
- 2014-11-05 WO PCT/CN2014/090379 patent/WO2015135329A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696920A (en) * | 2009-10-27 | 2010-04-21 | 锦州万友机械部件有限公司 | Fatigue testing device for lateral dynamic bending of piston rod of vibration damper |
| CN102706570A (en) * | 2012-06-04 | 2012-10-03 | 唐山轨道客车有限责任公司 | Simulation test device for pneumatic load of vehicle body |
| CN102914478A (en) * | 2012-10-30 | 2013-02-06 | 北京理工大学 | Spring-lever energy storage type fatigue tension test machine |
| CN103353429A (en) * | 2013-06-25 | 2013-10-16 | 南京航空航天大学 | Simple test-piece fatigue testing machine |
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| Publication number | Publication date |
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| CN103837420A (en) | 2014-06-04 |
| WO2015135329A1 (en) | 2015-09-17 |
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