CN102980822A - Mechanical type pushing fatigue tester and corrosion fatigue testing method - Google Patents
Mechanical type pushing fatigue tester and corrosion fatigue testing method Download PDFInfo
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- CN102980822A CN102980822A CN2012105172096A CN201210517209A CN102980822A CN 102980822 A CN102980822 A CN 102980822A CN 2012105172096 A CN2012105172096 A CN 2012105172096A CN 201210517209 A CN201210517209 A CN 201210517209A CN 102980822 A CN102980822 A CN 102980822A
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Abstract
The invention discloses a mechanical type pushing fatigue tester, belonging to the field of structure experimental mechanics. The mechanical type pushing fatigue tester mainly consists of a steel frame, a power mechanism, a speed reducing mechanism, an ellipse wheel disc mechanism, an adjusting mechanism and a corrosion device. According to the basic principle of the mechanical type pushing fatigue tester, the output speed of a power motor is changed through the speed reducing mechanism, so that the requirements of a working mechanism are met; then, the circular motion is changed into rectilinear motion through the movement of the ellipse wheel disc, a pushing rod is connected with an elastic element, and a counter-force is adjusted by adjusting the lengths of the elastic element and the pushing rod, so that a precise reciprocation fatigue load can be applied; and meanwhile the fatigue test on the displacement control can be carried out if the elastic element is removed. The mechanical type pushing fatigue tester has the characteristic of high precision.
Description
Technical field
The present invention relates to a kind of mechanical pushing tow Multifunctional corrosion fatigue tester and corrosion fatigue test method, belong to the structural experiment mechanics field.
Background technology
In aviation, navigation, traffic, bridge, building, the port structure, the beam of various materials and flexible member are typical primary structure member, they all are under the repetition stress under the various environment for a long time, thereby this first grade member fatigue strength under various environment is the important subject in the structural mechanics.Particularly in the modern project structural design, must study the strength problem of member under complex environment and load, in the urgent need in the laboratory, realizing this load and ambient condition, examine the fatigue strength of member, set up for next step theory and prepare.
For a long time, realize that for this first grade member corrosion fatigue test is very difficult cheaply.Can realize by the servo apply hydraulic pressure fatigue tester at present, but because these equipment prices are expensive, environment for use is had strict requirement, and high energy consumption, the long-time use need very high experimentation cost.
Some existing mechanical and corrosion fatigue testing machines, because the simple employing displacement controlled loading of its charger, so in elastic range, malformation is less, the precision of load is realized by displacement accuracy fully, the wearing and tearing of testpieces in adding torture test, accuracy requirement that therefore can't warranty test load, cause test effect not good, especially for small-size test piece.
Summary of the invention
The object of the present invention is to provide the high mechanical type pushing tow fatigue tester of a kind of precision and corrosion fatigue test method.
A kind of mechanical type pushing tow fatigue tester is characterized in that: comprise bracing frame, charger; Wherein charger comprise the horizontal motor that is fixedly installed in bracing frame, the power source axle that links to each other with horizontal motor by reductor, the oval wheel that is installed on the power source axle; Also comprise the linear bearing and the counter-force sleeve that are fixedly installed in bracing frame and are positioned at successively the oval wheel below; Above-mentioned counter-force sleeve top has the first hole, pad, spring, loading pressure head is installed successively, at the adjustable adjustable plate of counter-force cylinder inner height in the counter-force sleeve from top to bottom, has the second hole on the adjustable plate; The second hole that stretch out on the adjustable plate lower end of above-mentioned loading pressure head contacts with testpieces; In the above-mentioned linear bearing propulsion arm is installed, the propulsion arm upper end contacts with oval wheel, and strong sensor is installed in the lower end; The first hole that counter-force sleeve top is passed in power sensor lower end contacts with pad.
Described mechanical type pushing tow fatigue tester is characterized in that: this testing machine changes and comprises corrosion device, and corrosion device is comprised of water pump and the corrosion case that is positioned at loading pressure head below.
Described mechanical type pushing tow fatigue tester carries out test specimen corrosion fatigue test method, it is characterized in that may further comprise the steps: (1), configuration etchant solution, test specimen is put into the corrosion case, by the turnover of water pump control etchant solution; (2), the ellipse of revolution wheel disc, regulate the oval wheel position by demand after, with oval wheel and power source shaft locking; (3), start power source, utilize the stroke of adjustable plate regulating spring; (4), by the further stroke of fine setting flexible member, adjust the entire length of propulsion arm, satisfy test specimen and load demand; Carry out the test specimen corrosion fatigue test.
The ultimate principle of this corrosion fatigue testing machine invention is actuating unit, the reducing gear collaborative work, mainly load by mechanical type pushing tow multifunctional loading unit, then corrode by corrosion device, load the combination of namely adopting mechanical motion and flexible member, by flexible member power and the principle that is deformed into direct ratio, the stroke of scale-up displacement, reduce the structure wearing and tearing, the load error that mechanical clearance causes, pass through oval wheel, lock(ing) bolt, propulsion arm, flexible member,, realize beam, plate, the method of the repetition fatigue loading of the degree of precision of the structural details such as spring.
Major advantage:Realize corrosion and tired acting in conjunction at same test unit; With a kind of combination of adopting mechanical motion and flexible member, by oval wheel, lock(ing) bolt, propulsion arm, flexible member, realize the method to the repetition fatigue loading of the structural details such as beam, plate, spring; On same set of test unit, two kinds of test methods of realizable force control and position control; Test unit is simple in structure, dependable performance, and equipment manufacturing cost is low; Test unit is the low energy consumption product, and energy-conserving and environment-protective, experimentation cost are cheap; Corrosion fatigue test under the particular surroundings that be applicable to that test frequency is low, the test period is long.
The expection benefit:The technical barrier of the lower low-cost torture test of the particular surroundings (corrosion environments such as high low temperature, salt fog and sulphuric dioxide) that this test unit has solved and required in the structural mechanics that test frequency is low, the test period is long is for the Corrosion Fatigue Properties research of structure and material provides a kind of simple and easy to do test method and device.The unmanned corrosion fatigue test apparatus of the low energy consumption of designing, high reliability is used the test battery device, the test method of realizable force and displacement control fatigue loading and corrosion fatigue coupling.And the test unit principle is clear, and compact conformation is easy to use, and low cost of manufacture is reusable, is very suitable for the test of the fatigue test piece in enormous quantities of new material, structure, has very high engineering using value.
Description of drawings
Fig. 1 is the test unit front view;
Fig. 2 is test unit side view (main member);
Fig. 3 testing machine bending test synoptic diagram;
Fig. 4 testing machine shear test synoptic diagram;
The attached test apparatus of Fig. 5 corrosion fatigue machine;
The number in the figure title: 1. reductor bolt hole 2. power source axles 3. oval wheels 4. clamping screws 5. reductor supports 6. propulsion arms 7. linear bearings 8. power sensors 9. pads 10. flexible members 11. counter-force shells 12. adjustable plates 13. load test part pads 14. testpieces 15. corrosion fatigue test casees 16. bracing frames, 17. load pressure heads 18. rigidity steel plates 19. reserve tanks 20. water pumps 21. reductors 22. motors 23. threaded rods 24. center pits 25. steel plates 26. testpieces 27. clamp devices 28. testpieces
Embodiment
The effect of each main associated components
Oval wheel: oval wheel move through propulsion arm so that circular motion originally, change the rectilinear motion of pushing tow into, so that charger provides the pressure of orthoscopic.
Linear bearing: so that two raceways have the rolling bearing of linear relative movement at rotating direction.
Propulsion arm: the transfer device of power with the poor power of changing into of the curve displacement of oval wheel, is directly delivered to loading specimen.
Motor: change electric energy the device of mechanical energy into, for whole corrosion fatigue machine provides power source.
Reductor: be power transmission mechanism, utilize the velocity transducer of gear, the winding number of engine is decelerated to desired winding number, and obtain the mechanism of larger torque, also reduced the inertia of load simultaneously.
Flexible member: by the size of flexible member regulation and control counter-force, thereby reach the purpose of power control.
Other experimental section synoptic diagram of corrosion fatigue machine
This corrosion fatigue machine is mechanical type pushing tow Multifunctional corrosion fatigue tester, when carrying out corrosion fatigue, attached apparatus is simply reequiped or used to machine, can carry out otherwise experiment.Such as Fig. 3, Fig. 4, shown in Figure 5, fatigue machine can carry out the experiments such as bending test, shear test, tension test and compression test.
Fig. 3 testing machine bending test synoptic diagram; Repacking explanation: adjust the propulsion arm of corrosion fatigue testing machine, then testpieces is placed (apart from capable of regulating) on the bearing, utilize machine to drive propulsion arm, can apply concentrated force, thereby carry out bending test.
Fig. 4 testing machine shear test synoptic diagram; Repacking explanation: adjust the distance of test specimen bearing, again by clamp device so that as above figure state of testpieces is clamped testpieces with portal frame such as figure again, drive propulsion arm by oval wheel and apply shearing to test specimen.
The attached experiment apparatus threaded rod of Fig. 5 corrosion fatigue machine is with nut, plays the purpose that supports whole apparatus, can regulate distance between each steel plate by nut.Center pit can allow testpieces pass steel plate, so that testpieces is stable between each steel plate.
Repacking explanation: utilize the attached experiment apparatus of mechanical type pushing tow Multifunctional corrosion fatigue machine as shown in the figure, can carry out the tensile and compression test of testpieces.Utilize anchor clamps and ground tackle to be fixed in steel plate testpieces
And steel plate
Between, then lifting jack places steel plate
And steel plate
Between, using lifting jack, lifting jack will be with steel plate
Upwards the top namely is equivalent to steel plate
A pulling force that makes progress namely played the effect of tension test part, and the size of pulling force can record by mechanics sensor.Same, if testpieces is still placed steel plate
And steel plate
Between, but lifting jack is placed steel plate
And steel plate
Between, using lifting jack, lifting jack can be with steel plate
To pressing down, namely be equivalent to pressure of testpieces, and the size of pressure also can record by mechanics sensor.
Realize ultimate principle of the present invention
This corrosion fatigue testing machine is realized the purpose of fatigue loading mainly by the work that cooperatively interacts of actuating unit, reducing gear, load maintainer; Add afterwards the work of corrosion device, corrode when being implemented in fatigue.Because the structural fatigue test is all carried out in the elastic range of material, therefore under the effect of load, the distortion of structure is very little, so the displacement deformation to the corrosion fatigue machine is had relatively high expectations, especially the displacement deformation of oval wheel formation requires to have very high repeatable accuracy, simultaneously owing to the rigidity degradation reason of Surface fatigue wear and the testpieces itself of testpieces, all can cause testpieces under identical displacement effect and the larger load error of appearance.The purpose of introducing in the present invention flexible member is exactly the moderate finite deformation by flexible member, form needed load and carry out torture test, reduce the load error that above-mentioned cause causes, well solved direct employing charger, reducing gear, the linkage assembly insurmountable load precision problem in the fatigue loading test that moves back and forth.
Tired charger adopts the mode of oval wheel pushing tow connecting rod, has well solved displacement and has played the problem of adjusting by 0 displacement, can be implemented in the little displacement torture test under the displacement control.
Claims (3)
1. a mechanical type pushing tow fatigue tester is characterized in that: comprise bracing frame (16), charger; Wherein charger comprise the horizontal motor (22) that is fixedly installed in bracing frame, the power source axle (2) that links to each other with horizontal motor (22) by reductor (21), the oval wheel (3) that is installed on power source axle (2); Also comprise the linear bearing (7) and the counter-force sleeve (11) that are fixedly installed in bracing frame (5) and are positioned at successively oval wheel (3) below; Above-mentioned counter-force sleeve (11) top has the first hole, pad (9), spring (10) are installed in the counter-force sleeve (11) from top to bottom successively, are loaded pressure head (17), at the adjustable adjustable plate (12) of counter-force cylinder inner height, has the second hole on the adjustable plate; The second hole that stretch out on the adjustable plate lower end of above-mentioned loading pressure head (17) contacts with testpieces; Propulsion arm (6) is installed in the above-mentioned linear bearing (7), and the propulsion arm upper end contacts with oval wheel, and strong sensor (8) is installed in the lower end; The first hole that counter-force sleeve top is passed in power sensor lower end contacts with pad (9).
2. mechanical type pushing tow fatigue tester according to claim 1, it is characterized in that: this testing machine changes and comprises corrosion device, and corrosion device is by water pump (20) and be positioned at the corrosion case (15) that loads pressure head (17) below and form.
3. utilize mechanical type pushing tow fatigue tester claimed in claim 2 to carry out test specimen corrosion fatigue test method, it is characterized in that may further comprise the steps: (1), configuration etchant solution, test specimen is put into the corrosion case, by the turnover of water pump control etchant solution; (2), the ellipse of revolution wheel disc, regulate the oval wheel position by demand after, with oval wheel and power source shaft locking; (3), start power source, utilize the stroke of adjustable plate regulating spring; (4), by the further stroke of fine setting flexible member, adjust the entire length of propulsion arm, satisfy test specimen and load demand; Carry out the test specimen corrosion fatigue test.
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| CN2012105172096A CN102980822A (en) | 2012-12-06 | 2012-12-06 | Mechanical type pushing fatigue tester and corrosion fatigue testing method |
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| CN2012105172096A CN102980822A (en) | 2012-12-06 | 2012-12-06 | Mechanical type pushing fatigue tester and corrosion fatigue testing method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308498A (en) * | 2013-05-14 | 2013-09-18 | 中国科学院物理研究所 | Direction-controlled uniaxial strain applying device for two-dimensional layered nano material |
| CN104089820A (en) * | 2014-07-14 | 2014-10-08 | 华东交通大学 | Device for testing loading of component compositely stressed by pressure, bending moment and shearing force |
| CN106323775A (en) * | 2016-09-08 | 2017-01-11 | 天津航天瑞莱科技有限公司 | Fatigue test apparatus for performing displacement constraint with spacing mechanism |
| CN106568701A (en) * | 2016-10-08 | 2017-04-19 | 浙江大学 | Disconnecting link online salt spray test apparatus |
| CN107560861A (en) * | 2017-10-20 | 2018-01-09 | 安徽工程大学 | A kind of double friction pair composite analogy experimental systems of valve actuating mechanism |
| CN108344682A (en) * | 2018-04-28 | 2018-07-31 | 国网浙江省电力有限公司电力科学研究院 | The electrochemical testing device and test method of cable armouring wire material fatigue corrosion |
| CN108548773A (en) * | 2018-03-30 | 2018-09-18 | 河海大学 | Detect the auxiliary device and its application method of reinforcing bar stainless property under by curved state |
| CN109211560A (en) * | 2018-11-01 | 2019-01-15 | 哈尔滨工业大学 | A kind of pilot system tested suitable for axial workpiece fatigue life in breaker |
| CN110749516A (en) * | 2019-10-09 | 2020-02-04 | 清华大学 | Soft film fatigue tester device |
| CN111829763A (en) * | 2020-04-28 | 2020-10-27 | 同济大学 | Electric spring fatigue testing device of containing type node |
| CN112098245A (en) * | 2020-08-14 | 2020-12-18 | 陕西千山航空电子有限责任公司 | Automatic alternating stress fatigue test device and method |
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| CN102706759A (en) * | 2012-06-12 | 2012-10-03 | 三一重工股份有限公司 | Flexural fatigue testing machine |
| CN203037544U (en) * | 2012-12-06 | 2013-07-03 | 南京航空航天大学 | Mechanical pushing fatigue testing machine |
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| JPH10332562A (en) * | 1997-05-30 | 1998-12-18 | Mitsubishi Heavy Ind Ltd | Device for testing fatigue in combustion gas |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308498A (en) * | 2013-05-14 | 2013-09-18 | 中国科学院物理研究所 | Direction-controlled uniaxial strain applying device for two-dimensional layered nano material |
| CN104089820A (en) * | 2014-07-14 | 2014-10-08 | 华东交通大学 | Device for testing loading of component compositely stressed by pressure, bending moment and shearing force |
| CN104089820B (en) * | 2014-07-14 | 2016-04-06 | 华东交通大学 | Subjected To Compression, Bending, Shear composite force component load testing machine |
| CN106323775A (en) * | 2016-09-08 | 2017-01-11 | 天津航天瑞莱科技有限公司 | Fatigue test apparatus for performing displacement constraint with spacing mechanism |
| CN106323775B (en) * | 2016-09-08 | 2023-05-26 | 天津航天瑞莱科技有限公司 | Fatigue test device for carrying out displacement constraint by limiting mechanism |
| CN106568701B (en) * | 2016-10-08 | 2019-07-12 | 浙江大学 | A kind of online salt spray test device of disconnecting link |
| CN106568701A (en) * | 2016-10-08 | 2017-04-19 | 浙江大学 | Disconnecting link online salt spray test apparatus |
| CN107560861A (en) * | 2017-10-20 | 2018-01-09 | 安徽工程大学 | A kind of double friction pair composite analogy experimental systems of valve actuating mechanism |
| CN108548773A (en) * | 2018-03-30 | 2018-09-18 | 河海大学 | Detect the auxiliary device and its application method of reinforcing bar stainless property under by curved state |
| CN108344682A (en) * | 2018-04-28 | 2018-07-31 | 国网浙江省电力有限公司电力科学研究院 | The electrochemical testing device and test method of cable armouring wire material fatigue corrosion |
| CN109211560A (en) * | 2018-11-01 | 2019-01-15 | 哈尔滨工业大学 | A kind of pilot system tested suitable for axial workpiece fatigue life in breaker |
| CN109211560B (en) * | 2018-11-01 | 2020-11-13 | 哈尔滨工业大学 | Test system suitable for fatigue life test of inner shaft part of circuit breaker |
| CN110749516A (en) * | 2019-10-09 | 2020-02-04 | 清华大学 | Soft film fatigue tester device |
| CN111829763A (en) * | 2020-04-28 | 2020-10-27 | 同济大学 | Electric spring fatigue testing device of containing type node |
| CN112098245A (en) * | 2020-08-14 | 2020-12-18 | 陕西千山航空电子有限责任公司 | Automatic alternating stress fatigue test device and method |
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Application publication date: 20130320 |