CN101608986A - A kind of bidirectional final test fixture and bidirectional final test method thereof - Google Patents
A kind of bidirectional final test fixture and bidirectional final test method thereof Download PDFInfo
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Abstract
A kind of bidirectional final test fixture and bidirectional final test method thereof, the primary structure of anchor clamps is: plane piece fixture (2) is " people " font, the opposite face of the left and right sides, bottom all has the groove (4) suitable with plane test specimen (13), and groove (4) wall is provided with and holds out against screw (3); Ball piece fixture (8) has the ball test specimen chamber (7) suitable with ball test specimen (5), and the wall in ball test specimen chamber (7) is provided with and holds out against ball screw (6); Ball test specimen chamber (7), piston (9) and plane piece fixture (2) three's vertical axis overlaps.One side on the top of plane piece fixture (2) is connected with on vertical screw rod (10), the ball piece fixture (8) and then is connected with down vertical screw rod (12), is connected with displacement transducer between vertical up and down screw rod (12).This experiment clip prodigiosin is simulated the bidirectional final wearing and tearing under ball/face contact conditions effectively on existing hydraulic servo fine motion experiment table, test out its tribological property, and the contact fatigue life of assessment coating under ball/face contact bidirectional final condition.
Description
Technical field
The present invention relates to material friction polishing machine and coating life evaluation test technical field, relate in particular to the fine motion test method and the fine motion test fixture of material.
Background technology
Be different from friction modes such as slip, rolling, fine motion is the relative motion of the amplitude that takes place between interference fit minimum (usually in micron dimension).The mode of motion of fine motion is very complicated, with ball and plane contact is example, by different direction of relative movement, fine motion can be divided into four kinds of fundamental types such as tangential, radial, tumbling-type and twisting type, wherein the fine motion direction of tangential fine motion is the tangential direction of the sphere of ball/face contact position, and the fine motion direction of radial fine motion is the normal orientation of the sphere of ball/face contact position.Fine motion can cause the surface abrasion between surface of contact, produces material unaccounted-for (MUF) and scantling and changes, and causes member interlock, loosening, power loss, noise increases or form pollution source etc.; It also can quicken the germinating and the expansion of crackle, and the life-span of parts is reduced greatly.Fine motion has become the one of the main reasons of wringing fit component failure in industry such as machinery, nuclear power, aviation, railway, electric power.Therefore, material is carried out the fine motion experiment, test out the tribological property of material under the fine motion operating mode, to reducing the fretting wear problem that occurs in the engineering reality, improve the relevant design of engineering, the performance of raising equipment and apparatus and life-span, energy savings etc. have crucial meaning.
In engineering reality, single is tangential with radially fine motion is relative less, and what exist in a large number is the situation that two wringing fit Contact Pair are born tilting load, the oblique fine motion of generation.This oblique fine motion is decomposed along the tangential and normal direction of surface in contact, can be decomposed into tangential and radially two kinds of fine motions, therefore can be referred to as bidirectional final, the just tangential and result of bidirectional final effect radially of the destruction on Contact Pair surface, and cause serious surface damage (wearing and tearing are or/and tired).And the hydraulic loaded direction (i.e. Mo Ni fine motion direction) of the plane test specimen of its clamping of existing fine motion experiment anchor clamps and hydraulic servo experiment table or vertical or parallel, thereby can only carry out single tangentially or radially fine motion experiment and can't carry out tangential and the radially experiment of bidirectional final, thereby the tribological property to material under the bidirectional final working condition of a large amount of existence can't carry out truly, the test and the assessment of coating life accurately.
Summary of the invention
Purpose of the present invention, just provide a kind of bidirectional final test fixture, this experiment clip prodigiosin is on existing hydraulic servo fine motion experiment table, simulate the bidirectional final wearing and tearing under ball/face contact conditions effectively, test out its tribological property, and the contact fatigue life of assessment coating under ball/face contact bidirectional final condition.
The present invention realizes its goal of the invention, and the technical scheme that is adopted is:
A kind of bidirectional final test fixture, comprise: the plane piece fixture that the load transducer lower thread below the crossbeam of hydraulic servo fine motion experiment table connects, the ball piece fixture that the piston of the hydraulic cylinder of hydraulic servo fine motion experiment table is threaded above, its design feature is:
The plane piece fixture is " people " font, and the opposite face of the left and right sides, piece fixture bottom, plane all has and the suitable groove of plane test specimen, and is provided with the screw that holds out against the plane test specimen on this groove walls;
The ball piece fixture has the ball test specimen chamber suitable with the ball test specimen, and the wall in ball test specimen chamber is provided with the screw that holds out against the ball test specimen; Ball test specimen chamber, piston and plane piece fixture three's vertical axis overlaps.
One side on the top of plane piece fixture is connected with the following vertical screw rod that then is connected with installation vertical deviation sensor on last vertical screw rod that the vertical deviation sensor is installed, the ball piece fixture, and the axis of upper and lower vertical screw rod (11,12) is overlapping.
Compared with prior art, the invention has the beneficial effects as follows:
Plane of the present invention piece fixture is " people " font, the plane test specimen is clamped in the groove of the left and right sides, piece fixture bottom, plane, again the ball test specimen is clamped in the ball test specimen chamber of ball piece fixture, because ball test specimen chamber, piston overlap with plane piece fixture three's vertical axis, therefore, the plane test specimen after the clamping tilts to contact in the both sides of departing from vertical axis with the ball test specimen.Piston actuated ball test specimen by the hydraulic servo experiment table moves down along its vertical axis then, thereby make plane test specimen and ball test specimen that oblique (two-way) fine motion take place in the contact position, therefore test fixture of the present invention can be realized plane test specimen and ball test specimen bidirectional final, simulates the bidirectional final under ball/face contact conditions effectively.Again by displacement transducer and load transducer during to bidirectional final the relative displacement and the load of plane test specimen and ball test specimen test, get final product out-of-plane test specimen and the tribological property of ball test specimen under the bidirectional final condition, for being coated with the layer plane test specimen, can assess its life-span under the bidirectional final condition.
The axis that the last vertical screw rod of vertical deviation sensor, following vertical screw rod are installed is overlapping, and be connected on plane piece fixture and the ball piece fixture, make the length of upper and lower vertical screw rod the shortest, distance is minimum, thereby make the displacement of plane test specimen and ball test specimen directly effectively pass to the vertical deviation sensor, displacement measurement is accurate, error is little.
The angle of the above-mentioned left and right sides, piece fixture bottom, plane opposite face is 20 °～160 °; By changing the plane piece fixture of different angles, can simulate the bidirectional final of differing tilt angles, thereby can make test fixture of the present invention can carry out the simulation of bidirectional final experiment, make its simulation test result truer, more accurate according to operating modes different in the engineering reality.
The translational speed scope of above-mentioned piston is 1～6000 μ m/min, and the change in displacement scope is 1～12000 μ m.The range of vertical deviation sensor is 1～60 μ m, and its measuring accuracy is 0.2 μ m; The range of load transducer is 0～1000N.Can set, measure and control the bidirectional final experiment parameter accurately like this, can satisfy common materials bidirectional final experimental requirements.
Another goal of the invention of the present invention provides a kind of method of using above bidirectional final test fixture to carry out the bidirectional final experiment.The step of this method is:
A, test specimen install: a plane test specimen is placed the groove of plane piece fixture one side, perhaps two plane test specimens are placed the groove of piece fixture both sides, plane; And then the screw that screws on the groove walls holds out against one or two plane test specimen; The ball test specimen is placed the ball test specimen chamber of ball piece fixture, and the screw that screws on the wall of ball test specimen chamber holds out against the ball test specimen;
B, position adjust: move down the vertical position of the crossbeam of regulating hydraulic servo fine motion experiment table by hydraulic system, realize the coarse adjustment of plane test specimen and ball test specimen position; By computer measurement and control system, the piston of accurately controlling hydraulic servo fine motion experiment table hydraulic cylinder moves up, and adds the setting preload, realizes that the plane test specimen contacts with the reliable of ball test specimen.
C, installation position displacement sensor: with on the last vertical screw rod that is installed in plane piece fixture side of vertical deviation sensor and on the following vertical screw rod of ball piece fixture;
D, fine motion experiment:
The zero clearing of load transducer data, computer measurement and control system control piston make the ball piece fixture move up by the loading velocity of setting, and plane test specimen imposed load to the maximum load of setting is ended; Piston moves downward the minimum load that is offloaded to setting and ends then, and this minimum load value is greater than setting preload value; Piston moves back and forth, and the plane test specimen is applied the load of reciprocation cycle, the maximal value of reciprocation cycle load and minimum value respectively with the first time round-robin maximum load equate that with minimum load piston moves back and forth till the cycle index of setting; At piston in the test specimen imposed load of plane, the vertical deviation sensor is measured the vertical deviation between plane test specimen and the ball test specimen, this displacement signal is sent into computer measurement and control system, draw and set the load-displacement curve after the circulation each time under the load-up condition, with the friction dynamics feature of exosyndrome material under the bidirectional final pattern;
Perhaps, the zero clearing of load transducer data, the computer measurement and control system control piston makes the ball piece fixture move up by the loading velocity of setting, and to plane test specimen imposed load, makes the ball test specimen be pressed into the plane test specimen to the degree of depth of setting; Piston is the center with the position of this degree of depth then, pumps with the displacement amplitude of setting, and the value of displacement amplitude is less than 2 times of the set depth value; Piston moves back and forth to the cycle index of setting; When piston moves back and forth, load transducer is measured the vertical load that the plane test specimen is subjected to, this load signal is sent into computer measurement and control system, draws to set the load-displacement curve after the circulation each time under the displacement condition, with the friction dynamics feature of exosyndrome material under the bidirectional final pattern.
By above method, the plane test specimen is installed in the oblique groove of plane specimen holder downside of " people " font, and the ball test specimen is clamped in the ball test specimen chamber of ball piece fixture, because ball test specimen chamber, piston, plane piece fixture three's vertical axis overlaps, therefore, plane test specimen after the clamping tilts to contact in the both sides of departing from vertical axis with the ball test specimen, accurately control the ball piece fixture by the load of setting by computer measurement and control system again, loading speed, cycle index makes ball test specimen and plane test specimen produce bidirectional final, the displacement that produces when measuring bidirectional final by displacement transducer again, and draw the load-displacement curve of material under the bidirectional final experiment condition by the computer measurement and control system analysis automatically, this mode is applicable to bear the material that permanent load changes amplitude in actual condition, carries out the bidirectional final experiment.
Perhaps after installing test specimen, accurately controlling the ball piece fixture by computer measurement and control system again makes ball test specimen and plane test specimen produce bidirectional final by displacement amplitude, loading speed, the cycle index set, the load that the plane test specimen bears when measuring bidirectional final by load transducer again, and draw the load-displacement curve of material under the bidirectional final experiment condition by the computer measurement and control system analysis automatically, this mode is applicable to bear the material of steady motion displacement amplitude in actual condition, carries out the bidirectional final experiment.
Analyze according to load-displacement curve that test draws under the different cycle indexes, promptly can draw the dynamics of material under the bidirectional final pattern, the material after the test is carried out abrasion analysis, can assess out its wear mechanism and service life thereof easily.
Experimental technique of the present invention both can have been installed a plane test specimen and test when experimentizing, and two plane test specimens also can be installed test, and when the test specimen of a plane of installation, system stiffness is less; When the test specimen of two planes of installation, system stiffness is bigger, and both of these case all exists in engineering reality.
As seen bidirectional final experimental technique of the present invention has outstanding advantage: can simulate the bidirectional final of ball/face contact by imposing a condition, thereby can test out the tribological property of material under various bidirectional final conditions more truly, accurately.And can well assess out the service life of material, this plane coating test specimen for a large amount of needs assessment coating lifes has great importance.And method of testing is measured automatically and is controlled under the control of calculating TT﹠C system, the automaticity height, and the good reproducibility of experiment, test data is accurately reliable.
Below in conjunction with accompanying drawing and concrete embodiment, the present invention is further detailed explanation.
Description of drawings
Fig. 1 is the structural representation of the bidirectional final test fixture of the embodiment of the invention
Fig. 2 a tests the load-displacement curve of the plane test specimen that obtains after the 1st circulation finished to a concrete test specimen for the method that adopts the embodiment of the invention 1.(90 ° of both sides, piece fixture bottom, plane opposite face angles.The material of selecting for use is: the plane test specimen is 45 of 10mm * 10mm * 20mm
#Steel, ball test specimen are the GCr15 ball bearing steel ball of Φ 60mm.Test condition: the loading velocity of setting is 12mm/min, and the maximum load of setting is 800N, the minimum load 50N of setting, and the cycle index of setting is 10
5Inferior.)
Fig. 2 b for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 5 circulation times obtain.
Fig. 2 c for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 49 circulation times obtain.
Fig. 2 d for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 50 circulation times obtain.
Fig. 2 e for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 5000 circulation times obtain.
Fig. 2 f finishes 10 for the same test of Fig. 2 a
5Load-the displacement curve of the plane test specimen that inferior circulation time obtains.
Fig. 3 a tests 10 another concrete test specimen for the method that adopts the embodiment of the invention 1
5After inferior circulation is finished, the bidirectional final polishing scratch Stereo microscope pattern photo of the plane test specimen that obtains.(both sides, piece fixture bottom, plane opposite face angle is 120 °.The material of selecting for use is: the plane test specimen is 2091 aluminium alloys of 10mm * 10mm * 20mm, and the ball test specimen is the GCr15 ball bearing steel ball of Φ 60mm.Test condition: the loading velocity of setting is that the maximum load that 12mm/min sets is 800N, the minimum load 50N of setting, and the cycle index of setting is 10
5Inferior.)
Fig. 3 b finishes 10 for the same test of Fig. 3 a
5The bidirectional final polishing scratch surface profile map of the plane test specimen that obtains after the inferior circulation.
Embodiment
Fig. 1 illustrates, first kind of embodiment of the present invention is a kind of bidirectional final test fixture, comprise: the plane piece fixture 2 that load transducer 1 lower thread below the crossbeam of hydraulic servo fine motion experiment table connects, the ball piece fixture 8 that the piston 9 of the hydraulic cylinder of hydraulic servo fine motion experiment table is threaded above.Wherein:
One side on the top of plane piece fixture 2 is connected with the following vertical screw rod 12 that then is connected with installation vertical deviation sensor 11 on last vertical screw rod 10 that vertical deviation sensor 11 is installed, the ball piece fixture 8, and the axis of upper and lower vertical screw rod is overlapping.
The angle of the left and right sides, the plane piece fixture 2 bottom opposite face that this is routine is 20 °～160 °;
The range of the vertical deviation sensor that this example is selected for use is 1～60 μ m, and its measuring accuracy is 0.2 μ m; The range of load transducer is 0～1000N; The translational speed scope of piston is 1～6000 μ m/min, and the change in displacement scope of piston is 1～12000 μ m.
Use above bidirectional final test fixture to carry out first kind of concrete grammar of bidirectional final experiment, the steps include:
A, test specimen are installed: a plane test specimen 13 is placed the groove 4 of plane piece fixture 2 one sides, and then the screw 3 that screws on groove 4 walls holds out against one or two plane test specimen 13; Ball test specimen 5 is placed the ball test specimen chamber 7 of ball piece fixture 8, and the screw 6 that screws on 7 walls of ball test specimen chamber holds out against ball test specimen 5;
B, position adjust: move down the vertical position of the crossbeam of regulating hydraulic servo fine motion experiment table by hydraulic system, realize the coarse adjustment of plane test specimen 13 and ball test specimen 5 positions; By computer measurement and control system, the piston 9 of accurately controlling hydraulic servo fine motion experiment table hydraulic cylinder moves up, and adds the setting preload, realizes that plane test specimen 13 contacts with the reliable of ball test specimen 5.
C, installation position displacement sensor: with on the last vertical screw rod 10 that is installed in plane piece fixture 2 sides of vertical deviation sensor 11 and on the following vertical screw rod 12 of ball piece fixture 8;
D, fine motion experiment:
The bidirectional final test fixture and the embodiment 1 of present embodiment are identical.
Its experimental technique is also substantially the same manner as Example 1, and different only is following two point operations:
A, test specimen are installed: the groove that two plane test specimens 13 is placed plane piece fixture 2 both sides.
D, fine motion experiment: load transducer 1 data zero clearing, computer measurement and control system control piston 9 make ball piece fixture 8 move up by the loading velocity of setting, and to plane test specimen 13 imposed loads, make ball test specimen 5 be pressed into plane test specimen 13 to the degree of depth of setting; Piston 9 is the center with the position of this degree of depth then, pumps with the displacement amplitude of setting, and the value of displacement amplitude is less than 2 times of the set depth value; Piston 9 moves back and forth to the cycle index of setting; When piston 9 moves back and forth, load transducer 1 is measured the vertical load that plane test specimen 13 is subjected to, this load signal is sent into computer measurement and control system, draw and set the load-displacement curve after the circulation each time under the displacement condition, with the friction dynamics feature of exosyndrome material under the bidirectional final pattern.
Adopt the result of the device of the above embodiment of the invention 1 and twice concrete test that test method is carried out thereof as follows:
Test for the first time: 90 ° of both sides, piece fixture bottom, plane opposite face angles.The material of selecting for use is: the plane test specimen is 45 of 10mm * 10mm * 20mm
#Steel, ball test specimen are the GCr15 ball bearing steel ball of Φ 60mm.Test condition: the loading velocity of setting is 12mm/min, and the maximum load of setting is 800N, the minimum load 50N of setting, and the cycle index of setting is 10
5Inferior.
Fig. 2 a tests the load-displacement curve of the plane test specimen that obtains after the 1st circulation finished to a concrete test specimen for the method that adopts the embodiment of the invention 1.
Fig. 2 b for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 5 circulation times obtain.
Fig. 2 c for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 49 circulation times obtain.
Fig. 2 d for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 50 circulation times obtain.
Fig. 2 e for the same test of Fig. 2 a at load-displacement curve of finishing the plane test specimen that 5000 circulation times obtain.
Fig. 2 f finishes 10 for the same test of Fig. 2 a
5Load-the displacement curve of the plane test specimen that inferior circulation time obtains.
By Fig. 2 a, Fig. 2 b and Fig. 2 c as seen, in 50 circulations of beginning, load-displacement curve presents the feature of approximate trapezoid, i.e. quadrilateral ABCD among the figure; By Fig. 2 d as seen, increase with the circulation cycle, load-displacement curve changes elliptical shape into; By Fig. 2 e and Fig. 2 f as seen, when the circulation cycle continues to increase, the loading and unloading curve overlaps, and load-displacement curve presents the near linear shape.
To tangential fine motion, its load-displacement curve has 3 kinds of forms of expression usually, i.e. linear pattern, oval type and parallelogram type.Under radially fine motion condition, load-displacement curve is usually expressed as two kinds of forms, i.e. closo and opening mode.Because tangential and radially fine motion have different load-displacement curves, when they are synthetic when forming bidirectional final, the load-displacement curve of bidirectional final should have tangential and the load of jog mode-displacement curve feature radially.From the compositive relation of geometric configuration, the load-displacement curve behind the formation bidirectional final should have 3 kinds of curvilinear characteristics, that is: linear pattern, oval type and accurate trapezoidal type.Fig. 2 a, Fig. 2 b, Fig. 2 c, Fig. 2 d, Fig. 2 e, Fig. 2 f result confirm, result and theoretical derivation result that bidirectional final test fixture of the present invention and test method obtain are in full accord, and bidirectional final test fixture of the present invention and test method be the bidirectional final of simulation material well.
Test for the second time: both sides, piece fixture bottom, plane opposite face angle is 120 °.The material of selecting for use is: the plane test specimen is 2091 aluminium alloys of 10mm * 10mm * 20mm, and the ball test specimen is the GCr15 ball bearing steel ball of Φ 60mm.Test condition: the loading velocity of setting is that the maximum load that 12mm/min sets is 800N, the minimum load 50N of setting, and the cycle index of setting is 10
5Inferior.
Fig. 3 a tests the 10th another concrete test specimen for the method that adopts the embodiment of the invention 1
5After inferior circulation is finished, the bidirectional final polishing scratch Stereo microscope pattern photo of the plane test specimen that obtains.
Fig. 3 b finishes 10 for the same test of Fig. 3 a
5The surface profile map of the axis direction of the plane test specimen that obtains after the inferior circulation.
By Fig. 3 a and Fig. 3 b as seen, the polishing scratch of material bidirectional final has tangible non-symmetrical features, and this is that the low load of the high side of a side makes material that corresponding inhomogeneous deformation be arranged because outer carrying tilts to apply, the lateral wearing that load is high is more serious, and has more abrasive dust to pile up.The result of Fig. 3 a and Fig. 3 b has confirmed that bidirectional final test fixture of the present invention and test method have well realized bidirectional final.
Above test findings confirms that bidirectional final test fine motion test fixture of the present invention has simulated the bidirectional final wearing and tearing that ball/face contacts really with method.
Claims (4)
1, a kind of bidirectional final test fixture, comprise: the plane piece fixture (2) that load transducer (1) lower thread below the crossbeam of hydraulic servo fine motion experiment table connects, the ball piece fixture (8) that the piston (9) of the hydraulic cylinder of hydraulic servo fine motion experiment table is threaded above is characterized in that:
Plane piece fixture (2) is " people " font, and the opposite face of plane piece fixture (2) left and right sides, bottom all has the groove (4) suitable with plane test specimen (13), and is provided with the screw (3) that holds out against plane test specimen (13) on this groove (4) wall;
Ball piece fixture (8) has the ball test specimen chamber (7) suitable with ball test specimen (5), and the wall in ball test specimen chamber (7) is provided with the screw (6) that holds out against ball test specimen (5); Ball test specimen chamber (7), piston (9) and plane piece fixture (2) three's vertical axis overlaps.
One side on the top of plane piece fixture (2) is connected with the following vertical screw rod (12) that then is connected with installation vertical deviation sensor (11) on last vertical screw rod (10) that vertical deviation sensor (11) is installed, the ball piece fixture (8), and the axis of upper and lower vertical screw rod (11,12) is overlapping.
2, a kind of bidirectional final test fixture according to claim 1 is characterized in that: the angle of described plane piece fixture (2) left and right sides, bottom opposite face is 20 °～160 °.
3, a kind of bidirectional final test fixture according to claim 1 is characterized in that: the range of described vertical deviation sensor (11) is 1～60 μ m, and its measuring accuracy is 0.2 μ m; The range of load transducer (1) is 0～1000N; The translational speed scope of piston (9) is 1～6000 μ m/min, and the change in displacement scope of piston (9) is 1～12000 μ m.
4, a kind of method of using the described bidirectional final test fixture of claim 1 to carry out the bidirectional final experiment the steps include:
A, test specimen install: a plane test specimen (13) is placed the groove (4) of plane piece fixture (2) one sides, perhaps two plane test specimens (13) are placed the groove (4) of plane piece fixture (2) both sides; And then the screw (3) that screws on groove (4) wall holds out against one or two plane test specimen (13); Ball test specimen (5) is placed the ball test specimen chamber (7) of ball piece fixture (8), and the screw (6) that screws on the wall of ball test specimen chamber (7) holds out against ball test specimen (5);
B, position adjust: move down the vertical position of the crossbeam of regulating hydraulic servo fine motion experiment table by hydraulic system, realize the coarse adjustment of plane test specimen (13) and ball test specimen (5) position; By computer measurement and control system, the piston (9) of accurately controlling hydraulic servo fine motion experiment table hydraulic cylinder moves up, and adds reliable contact of setting preload, realizing plane test specimen (13) and ball test specimen (5).
C, installation position displacement sensor: the last vertical screw rod (10) that vertical deviation sensor (11) is installed in plane piece fixture (2) side is gone up on the following vertical screw rod (12) that reaches ball piece fixture (8);
D, fine motion experiment:
Load transducer (1) data zero clearing, computer measurement and control system control piston (9) make ball piece fixture (8) move up by the loading velocity of setting, and plane test specimen (13) imposed load to the maximum load of setting is ended; Piston (9) moves downward the minimum load that is offloaded to setting and ends then, and this minimum load value is greater than setting preload value; Piston (9) moves back and forth, and plane test specimen (13) is applied the load of reciprocation cycle, the maximal value of reciprocation cycle load and minimum value respectively with the first time round-robin maximum load equate that with minimum load piston (9) moves back and forth till the cycle index of setting; At piston (9) in plane test specimen (13) imposed load, vertical deviation sensor (11) is measured the vertical deviation between plane test specimen (13) and the ball test specimen (5), this displacement signal is sent into computer measurement and control system, draw and set the load-displacement curve after the circulation each time under the load-up condition, with the friction dynamics feature of exosyndrome material under the bidirectional final pattern;
Perhaps, load transducer (1) data zero clearing, computer measurement and control system control piston (9) makes ball piece fixture (8) move up by the loading velocity of setting, and to plane test specimen (13) imposed load, makes ball test specimen (5) be pressed into plane test specimen (13) to the degree of depth of setting; Piston (9) is the center with the position of this degree of depth then, pumps with the displacement amplitude of setting, and the value of displacement amplitude is less than 2 times of the set depth value; Piston (9) moves back and forth to the cycle index of setting; When piston (9) moves back and forth, load transducer (1) is measured the vertical load that plane test specimen (13) is subjected to, this load signal is sent into computer measurement and control system, draw and set the load-displacement curve after the circulation each time under the displacement condition, with the friction dynamics feature of exosyndrome material under the bidirectional final pattern.
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| US6601456B1 (en) * | 2001-06-06 | 2003-08-05 | Southwest Research Institute | Fretting fixture for high-cycle fatigue test machines |
| CN1281937C (en) * | 2001-06-12 | 2006-10-25 | 西南交通大学 | Fixture and method for micro motion experiment |
| CN201191258Y (en) * | 2008-01-29 | 2009-02-04 | 西南交通大学 | Rotary micro friction and wear test apparatus |
| CN201429548Y (en) * | 2009-07-06 | 2010-03-24 | 西南交通大学 | Special gripper for bidirectional fretting tests |
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2009
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