CN106483020B - High-temperature high-pressure fretting fatigue testing machine - Google Patents
High-temperature high-pressure fretting fatigue testing machine Download PDFInfo
- Publication number
- CN106483020B CN106483020B CN201611075732.2A CN201611075732A CN106483020B CN 106483020 B CN106483020 B CN 106483020B CN 201611075732 A CN201611075732 A CN 201611075732A CN 106483020 B CN106483020 B CN 106483020B
- Authority
- CN
- China
- Prior art keywords
- testing machine
- pressure
- sample
- fatigue testing
- pressing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
- G01N3/02—Details
-
- 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
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The application discloses a high-temperature high-pressure fretting fatigue testing machine which can be used for fretting fatigue testing in high-temperature high-pressure water, steam or liquid environments, wherein a normal force loading device adopted in the testing machine can realize constant normal force loading on a sample only by selecting a linear motor with small load, and the force value lost after abrasion between a compression gasket and the sample is compensated in real time in the whole testing process.
Description
Technical Field
The application relates to a high-temperature high-pressure fretting fatigue testing machine.
Background
Fretting is a wear phenomenon that occurs on two contact surfaces, typically on the contact surface with minute, continuous relative movement, typically with a displacement range on the order of microns, typically between tens and hundreds of microns. Fretting fatigue refers to a phenomenon that a member is subjected to cyclic load, and a certain part of the surface and other contact surfaces slide relatively with small amplitude, so that the fatigue strength of the member is reduced or the member is broken early. Fretting Fatigue (FF) phenomenon widely exists in the fields of machinery, traffic, electric power, aerospace, biomedical engineering and the like, and can accelerate the initiation and expansion of Fatigue cracks of parts, thereby obviously reducing service life and even causing catastrophic accidents, so that Fretting damage is called as cancer in industry. Researches show that the fretting energy can reduce the fatigue life of the component by 20% -80% and even lower. Therefore, the damage behavior and the protective measures of fretting fatigue are systematically researched, and the method has important theoretical significance and engineering application value.
However, wear of parts in the industrial field often occurs in high temperature and/or high pressure water chemistry or gas environments, and data between parts measured on conventional mechanical testers is not applicable. The application provides a complete set of test device for micro fatigue test in high-temperature normal-pressure water chemistry environment and high-temperature normal-pressure gas environment.
In addition, in fretting fatigue tests, it is critical to maintain long-term stable loading of normal force, which is a key to quantitatively characterize the effect of fretting on the fatigue life of a material. The normal force loading method of fretting fatigue commonly used at present is bolt loading or stress ring loading, and the method has the defects that: as the test proceeds, wear will occur between the pad and the sample, thus resulting in a constant normal force between the two, which will continue to decrease and even zero. The method can be used for manually adjusting and compensating the loss of normal force at normal temperature and normal pressure, but in a high-temperature high-pressure closed environment, the manual adjustment and compensation cannot be performed, and the real-time adjustment cannot be performed by the manual adjustment and compensation.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provides a high-temperature high-pressure fretting fatigue testing machine.
In order to achieve the above purpose, the application adopts the following technical scheme: the utility model provides a high temperature high pressure fine motion fatigue testing machine, includes the frame, locates with the oscilaltion main shaft on the frame, set firmly in pressure vessel on the frame, pressure vessel has the airtight environment cavity that can full high temperature high pressure environment, the main shaft stretches into in the environment cavity, the sample is fixed through the anchor clamps on the main shaft and juxtaposing in the environment cavity, the testing machine still includes and is used for carrying out normal force loading device of normal force loading to the sample, normal force loading device includes:
the two groups of the pressing gaskets are respectively arranged on two different sides of the sample in the radial direction so as to respectively press the sample in the radial direction;
the gasket guide plate is fixedly arranged in the environment chamber relative to the clamp, a containing groove for the sample to penetrate in the radial direction and two guide grooves which are respectively positioned at two sides of the containing groove and communicated with the containing groove are formed in the gasket guide plate, and two groups of compression gaskets are respectively arranged in the guide grooves at two sides in a sliding fit manner;
the pressing mechanism comprises two groups of pressing gaskets for applying pressing force, the pressing mechanism comprises a linear motor fixedly arranged on the base and a pressure self-balancing stretching shaft fixedly connected to a motor shaft of the linear motor, the pressure self-balancing stretching shaft is provided with an output end extending into the environment chamber, a force sensor is fixedly connected to the output end, the pressing mechanism further comprises a connecting shaft, one end of the connecting shaft is fixedly connected to the force sensor, and the other end of the connecting shaft is a pressing end for pushing the pressing gaskets to apply the pressing force;
the normal force loading device further comprises a controller capable of controlling the working states of the two groups of linear motors according to the pressure values fed back by the two groups of force sensors.
Preferably, the pressing ends of the connecting shafts on both sides extend into the corresponding guide grooves in the axial direction respectively to apply the pressing gaskets to press the force.
Preferably, the contact end surface of the pressing gasket, which is in contact with the sample, is an arc surface, a plane or a sphere, and the central lines of the pressing gaskets on two sides are collinear and extend along the radial central line of the sample.
Preferably, the gasket guide plate is disc-shaped, the accommodating groove is U-shaped with an opening facing the radial outer side of the accommodating groove, and the gasket guide plate is fixed on the clamp.
Preferably, the pressing gasket and the guide groove are arranged in a clearance fit.
Preferably, the pressure vessel is an autoclave capable of filling high-temperature high-pressure gas or liquid environment, the autoclave comprises a autoclave body fixedly arranged on the base and a autoclave cover arranged above the autoclave body and capable of being opened and closed in a matched mode, and the main shaft of the fatigue testing machine penetrates through the autoclave cover and stretches into the inner cavity of the autoclave.
Further, the clamp is fixedly arranged on the kettle cover, the sample is fixedly arranged between the clamp and the main shaft, and the gasket guide plate, the kettle cover and the clamp are relatively fixedly arranged.
As a specific implementation mode, the clamp comprises a clamp seat and a plurality of connecting columns fixedly connected with the clamp seat and the kettle cover, and the gasket guide plates are fixedly arranged on the connecting columns.
Further, the fatigue testing machine also comprises a cross beam with an adjustable upper and lower position relative to the machine base, and the kettle cover is arranged on the cross beam; the main shaft can be arranged on the cross beam in a lifting manner along the vertical direction, and a lifting driving mechanism for driving the main shaft to lift along the vertical direction is further arranged on the cross beam.
Still further, lifting drive mechanism is including setting up the hydro-cylinder on crossbeam upper portion, the telescopic link of hydro-cylinder stretches out downwards and is connected with the main shaft, the main shaft with still be provided with another force transducer between the telescopic link, the main shaft adopts another pressure self-balancing tensile axle, the upper portion of hydro-cylinder still is equipped with displacement sensor.
Due to the application of the technical scheme, compared with the prior art, the application has the following advantages: the high-temperature high-pressure fretting fatigue testing machine can be used for fretting fatigue testing in high-temperature high-pressure water, steam or liquid environments, the normal force loading device adopted in the testing machine can realize constant loading of normal force only by selecting a small-load linear motor, the force value lost after abrasion between the compression gasket and the sample is compensated in real time, the normal force value is kept constant, the load control and measuring precision can be obviously improved, the stable normal force loading force value is obtained, and the overall testing precision of the fretting fatigue testing machine is further improved.
Drawings
FIG. 1 is a perspective view of the whole structure of the fatigue testing machine of the present application;
FIG. 2 is a front view of the fatigue testing machine of the present application;
FIG. 3 is a schematic side cross-sectional view of the fatigue testing machine of the present application;
FIG. 4 is an enlarged schematic view of the normal force loading device portion of FIG. 3;
FIG. 5 is a schematic view of the installation of a test specimen;
FIG. 6 is a schematic view of a shim guide;
fig. 7, 8, 9 and 10 are schematic diagrams of the principle of loading adjustment of the normal force loading device.
Wherein: 10. a base; 20. a cross beam; 30. a column; 40. an oil cylinder; 50. a displacement sensor; 60. a force sensor; 70. a connecting flange; 80. connecting the upright posts;
1. an autoclave; 11. a kettle body; 12. a kettle cover; 2. a main shaft; 3. a sample; 4. a clamp; 41. a clamp seat; 42. a connecting column; 5. compressing the gasket; 6. gasket guide plate; 61. a receiving groove; 62. a guide groove; 7. a pressing and holding mechanism; 71. a linear motor; 72. a pressure self-balancing stretching shaft; 73. a force sensor; 74. a connecting shaft; 8. and a controller.
Detailed Description
The technical scheme of the application is further described below with reference to the attached drawings and specific embodiments.
Referring to fig. 1 to 6, a high temperature and high pressure micro fatigue tester includes a base 10, two upright posts 30 fixedly provided on the base 10 and extending in a vertical direction, and a cross beam 20 vertically provided on the upright posts 30 and having an adjustable upper and lower position with respect to the base 10, wherein a main shaft 2 is provided on the cross beam 20, and the main shaft 2 is vertically provided on the cross beam 20. The top of the cross beam 20 is also provided with a lifting driving mechanism for driving the main shaft 2 to lift up and down, wherein the lifting driving mechanism adopts an oil cylinder 40, and a telescopic rod of the oil cylinder 40 extends downwards to be connected with the main shaft 2 and is used for providing and controlling reciprocating motion under certain amplitude or load and frequency. A force sensor 60 is also arranged between the main shaft 2 and the telescopic rod, and a pressure self-balancing stretching shaft is adopted as the main shaft 2; the upper portion of the cylinder body of the cylinder 40 is further provided with a displacement sensor 50 to detect the displacement amount of the main shaft 2 in the vertical direction.
Referring to fig. 1 to 6, the fatigue testing machine further comprises a pressure vessel fixedly arranged on the base 10, the pressure vessel is provided with a closed environment chamber capable of filling high-temperature high-pressure gas or liquid environment, the pressure vessel is an autoclave 1, the autoclave 1 comprises a kettle body 11 fixedly arranged on the base 10, and a kettle cover 12 arranged above the kettle body 11 and capable of being opened and closed in a matched manner, the kettle cover 12 is covered on the kettle body 11 in a matched manner, so that the inner cavity of the kettle body 11 is closed and can be filled with the high-temperature high-pressure gas or liquid environment, and environmental parameters in the environment chamber of the autoclave 1 are controlled by additionally arranging a water circulation and water chemistry detection system.
The spindle 2 extends through the cover 12 into the ambient chamber of the autoclave 1, and the sample 3 is fixed to the spindle 2 by the clamp 4 and placed in the ambient chamber of the autoclave 1. Here, the main shaft 2 adopts a pressure self-balancing stretching shaft which has a pressure self-balancing function, so that the pressure difference between the inside and the outside of the autoclave 1 can be counteracted, the thrust generated by the pressure difference can be eliminated, dynamic sealing in a high-temperature and high-pressure environment can be realized, and the pressure self-balancing stretching shaft is adopted to connect the actuating part of the testing machine with the clamp 4 in the autoclave, so that the influence of the pressure difference between the inside and the outside of the autoclave 1 on the load in the reciprocating motion process of the actuating part of the fatigue testing machine can be avoided.
Referring to fig. 1 and 2, the kettle cover 12 is connected to the cross beam 20 through a loading and unloading kettle mechanism, and is opened and closed by driving the cross beam 20 to lift relative to the kettle body 11. Specifically, the loading and unloading kettle mechanism comprises a connecting flange 70 and a plurality of connecting upright posts 80, wherein the connecting flange 70 is fixedly connected to the lower end face of the cross beam 20 through bolts, the lower end of the connecting upright posts 80 is fixedly connected to the kettle cover 12, and the upper end of the connecting upright posts passes through holes in the connecting flange 70 and is locked through nuts, so that when the autoclave 1 is installed, the cross beam 20 moves downwards, the kettle cover 12 drops, and when the nuts on the connecting upright posts 80 are out of contact with the surface of the connecting flange 70, the kettle cover 12 and the kettle body 11 can be determined to be installed in a matched manner. When the connecting upright post 80 and the connecting flange 70 are fixedly connected, in the process of installing the kettle cover 12, after the kettle cover 12 and the kettle body 11 are matched and installed, the cross beam 20 excessively moves to enable the whole device to be in a stressed state, so that the test device is damaged.
Referring to the drawings, the fatigue testing machine further comprises a normal force loading device for loading the normal force to the sample 3, the normal force loading device comprises:
and two groups of pressing gaskets 5 are respectively arranged on two different sides of the sample 3 in the radial direction so as to respectively press the sample 3 in the radial direction. The contact end surface of the pressing gasket 5, which is contacted with the sample 3, can be an arc surface, a plane or a sphere, and the type of the contact end surface is determined according to the test requirement. The center lines of the two pressing gaskets 5 are collinear and extend from the radial center line of the sample 3 so as to ensure that normal force is applied to the sample 3 when the two pressing gaskets 5 are respectively pressed from two sides;
a gasket guide plate 6, which gasket guide plate 6 is fixedly arranged in the environmental chamber of the autoclave 1 with respect to the clamp 4 for providing a movement guide when the two compacting gaskets 5 compact the sample 3. Specifically, referring to fig. 6, the gasket guide plate 6 has a disc shape, on which a receiving groove 61 into which the sample 3 can be inserted in the radial direction, and two guide grooves 62 which are respectively located at both sides of the receiving groove 61 and are in communication with the receiving groove 61 are formed, the receiving groove 61 has a U shape with an opening facing the radial direction outside thereof, the sample 3 enters the receiving groove 61 in the radial direction, and the compression gaskets 5 at both sides are respectively slidably disposed in the guide grooves 62 at both sides, and the compression gaskets 5 and the guide grooves 62 are disposed in a clearance fit, which is as small as possible under the premise of ensuring free sliding at the time of expansion at high temperature. In this embodiment, the gasket guide plate 6 is fixedly disposed on the jig 4, specifically, the jig 4 includes a jig base 41 and a plurality of connection posts 42 fixedly connected between the jig base 41 and the kettle cover 12 of the autoclave 1, and the gasket guide plate 6 is fixed on the plurality of connection posts 42 as shown in fig. 5;
the holding mechanism 7 has two sets of holding mechanisms 7 for respectively applying the two side pressing pads 5 to press the force, thereby applying the sample 3 to the normal force. Referring to fig. 3 and 4, each group of holding mechanisms 7 comprises a linear motor 71 fixedly arranged on the base 10, and a pressure self-balancing stretching shaft 72 fixedly arranged on a motor shaft of the linear motor 71, wherein the pressure self-balancing stretching shaft 72 is provided with an output end extending into an environment chamber of the autoclave 1, and a force sensor 73 is fixedly connected to the output end; the pressing mechanism 7 further includes a connecting shaft 74, one end of the connecting shaft 74 is fixedly connected to the force sensor 73, and the other end of the connecting shaft 73 is a pressing end for pressing the pressing pad 5 to apply a pressing force. During normal force loading, the pressing ends of the connecting shafts 73 on both sides respectively extend into the corresponding guide grooves 62 in the axial direction to apply corresponding pressing gaskets 5 to press the force.
The normal force loading device further comprises a controller 8, and the controller 8 is in signal connection with the force sensors 73 on both sides and is in signal connection with the linear motors 71 on both sides. The controller 8 can control the working states of the two sets of linear motors 71 according to the pressure values fed back by the two side force sensors 73, so that the normal force applied by the two side pressing gaskets 5 to the sample 3 is kept at a set value or within a set range.
The working process and working principle of the high-temperature high-pressure fretting fatigue testing machine of the embodiment are briefly described below:
firstly, the clamp 4 is installed on the kettle cover 12 of the autoclave 1, the gasket guide plate 6 is installed at the same time, then the sample 3 is installed between the clamp seat 41 and the main shaft 2, the sample 3 radially passes through the accommodating groove 61 of the gasket guide plate 6, then the two pressing gaskets 5 are respectively placed into the two guide grooves 61 of the gasket guide plate 6, so that the two pressing gaskets 5 slightly contact the sample 3, and the central connecting line of the two pressing gaskets 5 contacting the sample 3 is extended along the radial central line of the sample 3 as far as possible during installation. Then, the cross beam 20 is lowered relative to the base 10, so that the kettle cover 12 and the kettle body 11 are matched and installed to form a closed environment chamber, and the environment parameters in the environment chamber of the high-pressure kettle 1 are controlled through the water circulation and water chemistry detection system, so that the filled environment state in the environment chamber meets the test requirement.
The normal force is then applied, initially, as shown in fig. 7, when the pressing end of the connecting shaft 74 has not yet penetrated into the guide groove 62 of the shim guide 6, the normal force F 0 =0. The distance S between the pressing end of the connecting shaft 74 and the end face of the pressing washer 5 is first determined, and the controller 8 switches to the displacement control mode. As shown in fig. 8, after the controller 8 controls the linear motors 71 on both sides to operate so that the displacement of the pressing end of the connecting shaft 74 reaches S, the linear motors 71 temporarily stop operating, and at this time, the pressing end is slightly contacted with the end surface of the pressing pad 5, and the normal force F 0 =0。
Then, the controller 8 is switched to the force control mode, and the controller 8 receives the pressure values fed back by the force sensors 73 on both sides to control the operating state of the linear motor 71. The method comprises the following steps: as shown in fig. 9, the controller 8 controls the two sets of linear motors 71 to operate so that the connecting shafts 74 on both sides face each otherThe pressing pads 5 moving to gradually approach to both sides respectively, and the force sensors 73 on both sides feed back the detected pressure values F to the controller 8 in real time respectively 0 When the detected pressure value F 0 Less than the stress value F preset in the test 1 When the controller 8 controls the two linear motors 71 to work and continuously drives the two connecting shafts 74 to move towards each other until the force sensor 73 feeds back the pressure value F to the controller 8 0 Equal to F 1 At this time, as shown in fig. 10, the controller 8 controls the two linear motors 71 to stop moving and maintain the pressure value, and starts the fretting fatigue test.
During the fretting fatigue test, the normal force loading device always keeps the normal force applied by the pressing gasket 5 to the sample 3 within a set range, and the set range is F 0 =F 1 And + -f, wherein f is a normal force value fluctuation amplitude value set by a fatigue test. Specifically, the two force sensors 73 feed back the detected pressure values F to the controller 8 in real time, respectively 0 When F 1 -f≤F 0 ≤F 1 At +f, the controller 8 controls the linear motor 71 to maintain a state of stopping movement; when F 0 ≤F 1 At the time of f, the controller 8 controls the linear motor 71 to work so as to drive the two connecting shafts 74 to move towards each other to increase the pressure value; when F 0 ≥F 1 At-f, the controller 8 controls the linear motor 71 to operate so as to drive the two connecting shafts 74 to move in opposite directions to reduce the pressure value. Thus, constant loading of normal force in the whole fretting fatigue test process is ensured.
In summary, the high-temperature high-pressure fretting fatigue testing machine has the following advantages:
(1) The fretting fatigue test machine can simulate the first loop temperature and the second loop temperature of the nuclear power station and carry out the fretting fatigue test under the pressure water chemistry condition;
(2) The fretting fatigue testing machine is adopted to conduct fretting fatigue tests, the contact mode between the sample 3 and the compression gasket 5 can be point, line and surface contact, the fatigue life cycle number of each sample can be obtained through measurement, a plurality of groups of samples and different parameters can be obtained, and the fatigue life curve of the sample, namely an S-N curve;
(3) The fatigue testing machine is simple in structure, and the perpendicularity and levelness of the fatigue testing machine can be conveniently adjusted so as to ensure the coaxiality and perpendicularity of the fatigue testing machine;
(4) The normal force loading device adopted in the fatigue testing machine can realize constant loading of normal force only by selecting a linear motor with small load, compensates the force value lost after abrasion between the compression gasket and the sample in real time, can improve load control and measurement precision, and obtains a stable normal force loading force value;
(5) By adopting the design of the pressure self-balancing stretching shaft, the offset of the internal and external pressure differences of the autoclave 1 can be realized, the thrust generated by the pressure differences is eliminated, and the test precision is further improved.
The above embodiments are provided to illustrate the technical concept and features of the present application and are intended to enable those skilled in the art to understand the content of the present application and implement the same, and are not intended to limit the scope of the present application. All equivalent changes or modifications made in accordance with the spirit of the present application should be construed to be included in the scope of the present application.
Claims (10)
1. The utility model provides a high temperature high pressure micro-motion fatigue testing machine, includes the frame, locates with the oscilaltion main shaft on the frame, set firmly in pressure vessel on the frame, pressure vessel has the airtight environment cavity that can full high temperature high pressure environment, the main shaft stretches into in the environment cavity, the sample is fixed through the anchor clamps on the main shaft and juxtaposing in the environment cavity, its characterized in that, the testing machine still includes and is used for carrying out normal force loading device of normal force loading to the sample, normal force loading device includes:
the two groups of the pressing gaskets are respectively arranged on two different sides of the sample in the radial direction so as to respectively press the sample in the radial direction;
the gasket guide plate is fixedly arranged in the environment chamber relative to the clamp, a containing groove for the sample to penetrate in the radial direction and two guide grooves which are respectively positioned at two sides of the containing groove and communicated with the containing groove are formed in the gasket guide plate, and two groups of compression gaskets are respectively arranged in the guide grooves at two sides in a sliding fit manner;
the pressing mechanism comprises two groups of pressing gaskets for applying pressing force, the pressing mechanism comprises a linear motor fixedly arranged on the base and a pressure self-balancing stretching shaft fixedly connected to a motor shaft of the linear motor, the pressure self-balancing stretching shaft is provided with an output end extending into the environment chamber, a force sensor is fixedly connected to the output end, the pressing mechanism further comprises a connecting shaft, one end of the connecting shaft is fixedly connected to the force sensor, and the other end of the connecting shaft is a pressing end for pushing the pressing gaskets to apply the pressing force;
the normal force loading device also comprises a controller which can control the working states of the two groups of linear motors according to the pressure values fed back by the two groups of force sensors, wherein the normal force loading device always keeps the normal force applied by the compression gasket to the sample within a set range in the process of micro fatigue test,
the setting range is F 0 =F 1 F (+/-F), wherein F 0 Feeding back the detected pressure value to the controller in real time for the force sensor, F 1 The stress value preset for the test is f, which is the fluctuation amplitude value of the normal force value set by the fatigue test; when F 1 -f≤F 0 ≤F 1 When +f, the controller controls the linear motor to keep a state of stopping movement; when F 0 ＜F 1 -f, when the controller controls the linear motor to work so as to drive the two groups of connecting shafts to move oppositely to increase the pressure value; when F 0 ＞F 1 And when +f, the controller controls the linear motor to work so as to drive the two groups of connecting shafts to move in opposite directions to reduce the pressure value.
2. The high temperature high pressure fretting fatigue testing machine according to claim 1, wherein: the pressing ends of the connecting shafts on the two sides extend into the corresponding guide grooves along the axial direction respectively so as to apply the pressing gaskets to press the force.
3. The high temperature high pressure fretting fatigue testing machine according to claim 1, wherein: the contact end face of the compaction gasket, which is in contact with the sample, is an arc surface, a plane or a spherical surface, and the central lines of the compaction gaskets on two sides are collinear and extend along the radial central line of the sample.
4. The high temperature high pressure fretting fatigue testing machine according to claim 1, wherein: the gasket guide plate is disc-shaped, the accommodating groove is U-shaped with an opening facing the radial outer side of the accommodating groove, and the gasket guide plate is fixed on the clamp.
5. The high temperature high pressure fretting fatigue testing machine according to claim 1, wherein: the compression gasket and the guide groove are arranged in a clearance fit manner.
6. The high temperature high pressure fretting fatigue testing machine according to claim 1, wherein: the pressure vessel is an autoclave capable of filling high-temperature high-pressure gas or liquid environment, the autoclave comprises a kettle body fixedly arranged on the base and a kettle cover arranged above the kettle body and capable of being opened and closed in a matched mode, and the main shaft of the fatigue testing machine penetrates through the kettle cover and stretches into an inner cavity of the autoclave.
7. The high temperature high pressure fretting fatigue testing machine according to claim 6, wherein: the clamp is fixedly arranged on the kettle cover, the sample is fixedly arranged between the clamp and the main shaft, and the gasket guide plate, the kettle cover and the clamp are relatively fixedly arranged.
8. The high temperature high pressure fretting fatigue testing machine according to claim 7, wherein: the clamp comprises a clamp seat, a plurality of connecting columns fixedly connected with the clamp seat and the kettle cover, and the gasket guide plates are fixedly arranged on the connecting columns.
9. The high temperature high pressure fretting fatigue testing machine according to claim 6, wherein: the fatigue testing machine also comprises a cross beam with an adjustable upper and lower position relative to the machine base, and the kettle cover is arranged on the cross beam; the main shaft can be arranged on the cross beam in a lifting manner along the vertical direction, and a lifting driving mechanism for driving the main shaft to lift along the vertical direction is further arranged on the cross beam.
10. The high temperature high pressure fretting fatigue testing machine according to claim 9, wherein: the lifting driving mechanism comprises an oil cylinder arranged on the upper portion of the cross beam, a telescopic rod of the oil cylinder extends downwards to be connected with the main shaft, another force sensor is further arranged between the main shaft and the telescopic rod, the main shaft adopts another pressure self-balancing stretching shaft, and a displacement sensor is further arranged on the upper portion of the oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075732.2A CN106483020B (en) | 2016-11-30 | 2016-11-30 | High-temperature high-pressure fretting fatigue testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075732.2A CN106483020B (en) | 2016-11-30 | 2016-11-30 | High-temperature high-pressure fretting fatigue testing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106483020A CN106483020A (en) | 2017-03-08 |
| CN106483020B true CN106483020B (en) | 2023-08-22 |
Family
ID=58275312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611075732.2A Active CN106483020B (en) | 2016-11-30 | 2016-11-30 | High-temperature high-pressure fretting fatigue testing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106483020B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990004A (en) * | 2017-04-26 | 2017-07-28 | 中国科学院金属研究所 | It is a kind of with the fretting fatigue testing device of HTHP recirculated water and its application |
| CN107589008B (en) * | 2017-11-03 | 2023-08-22 | 苏州热工研究院有限公司 | Force measuring device suitable for under high temperature high pressure environment |
| CN107703014B (en) * | 2017-11-03 | 2024-04-09 | 岭东核电有限公司 | Impact abrasion tester for high-temperature and high-pressure environment |
| CN108458824B (en) * | 2018-03-14 | 2020-08-04 | 哈尔滨工业大学 | Linear motor normal force testing device |
| CN109100219B (en) * | 2018-05-31 | 2021-04-27 | 西北工业大学 | Fretting fatigue test device and method |
| CN109443948B (en) * | 2018-12-13 | 2023-04-07 | 西安科技大学 | Creep performance test system and test method under high-temperature and high-pressure environment |
| CN110208125B (en) * | 2019-06-19 | 2023-12-08 | 中国科学院金属研究所 | High-temperature high-pressure water micro-fatigue positive pressure applying device and using method thereof |
| CN110907298B (en) * | 2019-11-20 | 2022-01-18 | 北京建筑大学 | Biaxial loading fretting fatigue test system and method |
| CN111693449B (en) * | 2020-06-22 | 2022-05-17 | 中国核动力研究设计院 | Telescopic corrosion kettle and corrosion test method for liquid lead-bismuth alloy |
| CN112683650A (en) * | 2020-12-09 | 2021-04-20 | 国核电站运行服务技术有限公司 | Normal fretting wear test device for high-temperature and high-pressure water environment |
| CN114486600B (en) * | 2022-04-18 | 2022-07-05 | 齐鲁工业大学 | Stepless variable-load axial loading system and bearing fretting wear testing machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359757A (en) * | 2014-10-27 | 2015-02-18 | 中北大学 | Hydraulically-controlled normal-pressure-adjustable fretting fatigue testing apparatus |
| CN104914042A (en) * | 2015-07-07 | 2015-09-16 | 苏州热工研究院有限公司 | Fretting wear testing machine in high temperature and high pressure water or steam environment |
| CN105043976A (en) * | 2015-07-28 | 2015-11-11 | 南京航空航天大学 | Test device for dynamically measuring fretting pair frictional coefficient during fretting fatigue process and test method |
| CN206192778U (en) * | 2016-11-30 | 2017-05-24 | 苏州热工研究院有限公司 | High temperature high pressure fine motion fatigue testing machine |
-
2016
- 2016-11-30 CN CN201611075732.2A patent/CN106483020B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359757A (en) * | 2014-10-27 | 2015-02-18 | 中北大学 | Hydraulically-controlled normal-pressure-adjustable fretting fatigue testing apparatus |
| CN104914042A (en) * | 2015-07-07 | 2015-09-16 | 苏州热工研究院有限公司 | Fretting wear testing machine in high temperature and high pressure water or steam environment |
| CN105043976A (en) * | 2015-07-28 | 2015-11-11 | 南京航空航天大学 | Test device for dynamically measuring fretting pair frictional coefficient during fretting fatigue process and test method |
| CN206192778U (en) * | 2016-11-30 | 2017-05-24 | 苏州热工研究院有限公司 | High temperature high pressure fine motion fatigue testing machine |
Non-Patent Citations (1)
| Title |
|---|
| 各向异性材料微动疲劳寿命研究;石炜等;《航空动力学报》;第29卷(第2期);337-342 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106483020A (en) | 2017-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106483020B (en) | High-temperature high-pressure fretting fatigue testing machine | |
| CN106680068B (en) | Constant normal force loading device and loading method in fretting fatigue test | |
| CN107179245B (en) | Tensile compression ring shear seepage tester and tensile compression ring shear seepage test system | |
| US20200080914A1 (en) | Multi-bolt loosening test machine for flange with tension, bending and torsion compound loading | |
| AU2020101815A4 (en) | An experimental instrument for rock mass tension and compression synergy | |
| CN102109445B (en) | Multi-direction heavy load frictional wear test method | |
| US10620069B2 (en) | Multi-bolt loosening test machine for flange with tension and bending compound loading | |
| CN103790895B (en) | Hydraulic cylinder side force assay device | |
| CN104912873B (en) | A kind of lateral force loading device of the hydraulic cylinder of simulated condition | |
| CN206208644U (en) | Constant normal force loading device in fretting fatigue testing | |
| CN103528900B (en) | Ultrahigh-strain-rate precise-stretching in-situ testing platform | |
| CN209878482U (en) | Device for testing fatigue mechanical properties of material under tensile-bending composite load | |
| CN108169036B (en) | Mechanical type sheet metal bidirectional shearing device | |
| CN110672436B (en) | Compression-shear testing machine | |
| CN111948077A (en) | High-temperature high-pressure composite fretting wear test device | |
| CN214309839U (en) | Test device for detecting stress relaxation performance of metal material | |
| CN216669588U (en) | High-temperature static-load creep testing machine for metal rubber component | |
| CN211347732U (en) | Full-automatic upset forging testing machine | |
| CN210982079U (en) | Compression-shear testing machine | |
| CN206192778U (en) | High temperature high pressure fine motion fatigue testing machine | |
| CN114002083A (en) | High-temperature static-load creep testing machine for metal rubber component and working method of high-temperature static-load creep testing machine | |
| CN102478440A (en) | Novel mechanical force measuring machine and calibration method | |
| CN107576578B (en) | Loading device and refractory material test loading and unloading method based on loading device | |
| CN220871888U (en) | Reaction frame structure for measuring hydraulic load | |
| RU2810652C1 (en) | Tension testing machine and its method of operation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |