CN104897460A - A test-piece clamp for multi-load coupling loading and a multi-physics field coupling loading method thereof - Google Patents
A test-piece clamp for multi-load coupling loading and a multi-physics field coupling loading method thereof Download PDFInfo
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Abstract
The invention relates to a test-piece clamp for multi-load coupling loading and a multi-physics field coupling loading method thereof, and belongs to the field of material micro-mechanical property testing. By machining a groove in the clamp, putting a test piece into the groove and compacting through pressing plates, application of stretching, bending, torsion, and other mechanical loads onto the test piece by the clamp is achieved. Conductive heating is performed by bringing a silicon nitride heating sheet and the test piece into contact, and temperature feedback is achieved by a thermocouple, thus achieving application of thermal-field loading onto the test piece to be tested. Electric-field loading to the test piece is achieved by providing the test piece with a controllable electric current. Magnetic-field loading to the test piece to be tested is achieved through two magnetic induction coils. The structure is simple and compact, the method is scientific and reasonable, and properties are stable and reliable. Large-range temperature loading, accurate electric current loading and controllable magnetic field loading for a test piece material to be tested can be achieved. Composite-load loading and stimulation of a thermal field, an electric field and a magnetic field, which are closer to service conditions, for material testing can be provided. The test-piece clamp and the method have important theoretical significance and application value.
Description
Technical field
The present invention relates to material micro-property particularly material Micro Mechanical Properties technical field of measurement and test, the piece fixture that the multi-load coupling particularly in a kind of material Micro Mechanical Properties test loads and multiple physical field coupling loading method thereof.Belong to exact instrument assembly and precision actuation gear unit assembly.
Background technology
in the last few years, the research work tested about the material Micro Mechanical Properties under multiple load, multiple physical field coupling condition receives international academic community and engineering circles is more and more paid close attention to.Often can because of the accidental destruction of material and goods thereof, inefficacy and cause the economic loss even generation of major accident in engineering field; why material and goods thereof all also can meet accident failure phenomenon through Mechanics Performance Testing inspection usually, and one of them very important reason is exactly do not have load applying state under Simulated Service condition truly and residing physical field environment when carrying out Mechanics Performance Testing.Material stretch test machine the most common, can only realize independent extension test, and torsion testing machine also can only provide single torsional load, and mechanical component often bear under condition under arms is all combined load.Material Testing Machine traditional is equally difficult to provide close to the electric field environment under service condition, thermal field environment, magnetic field environment simulation.Therefore traditional Material Testing Machine is difficult to provide the test close under service condition.Material properties test under combined load multiple physical field is that one more can be tested close under material under arms condition, and test data is truer, reliable.This test for new material exploitation and high-end precision assembly development of manufacturing all significant.
The piece fixture that multi-load coupling loads of being applicable to of comparative maturity is not also had at present to be coupled with multiple physical field loading method.Traditional Wedge gripping is under the condition of pre-clamping, and the moment of torsion of transmission is limited; Threaded fixture clamping difficulty, and can only one direction reverse.The difficulty that multiple physical field coupling loads is mainly reflected in the following aspects: first, observation problem, for in-situ materials Mechanics Performance Testing, be necessary for microscope and a good visual field is provided, must leave enough observation spaces, this just requires electric field, thermal field, the loading in magnetic field all can not the observation path of interference microscope; The second, the Resistant heating mode usually adopted is difficult to reach very high temperature, and temperature variation among a small circle has little significance for testing of materials; 3rd, electric field loads and passes into chilled water and can not carry out simultaneously, and fixture mostly is metallic conductor, will contact on the one hand be energized with test specimen, and will contact with chilled water on the other hand and lower the temperature, both carry out leaky occurring simultaneously; 4th, thermal field loading can make fixture generation thermal deformation, must ensure that fixture at high temperature still can reliable grip test specimen.In sum, the piece fixture that a set of reliable multi-load coupling the loads loading method that is coupled with multiple physical field is tested significant for material Micro Mechanical Properties.
Summary of the invention
The piece fixture that the object of the present invention is to provide the coupling of a kind of multi-load to load and multiple physical field coupling loading method thereof, solve the problems referred to above that prior art exists.The piece fixture that multi-load coupling of the present invention loads, can transmit stretching, bending, torsion combined load simply, reliably, efficiently.Multiple physical field coupling loading method, solves multiple physical field and loads the interference problem with in-situ observation, have larger range of temperature, can electric field loading carry out with cooling simultaneously, and reliable grip test specimen under hot conditions can be ensured.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
The piece fixture that multi-load coupling loads, for applying to stretch to test specimen 17, bending, clamping to test specimen sample under the load-up conditions such as torsion, this fixture is also by thermal field load-on module simultaneously, electric field load-on module, magnetic field load-on module realizes the thermal field to measured material sample, electric field loads with being coupled of magnetic field, its concrete structure is: silicon nitride heating sheet 25 compresses by heating plate pressing plate 4, be fixed in the groove of top board 3, three connects into an entirety, top board 3 and lower platen 5 are by left straight pin 18 chain connection, lower platen 5 is provided with the groove identical with specimen holder end physical dimension, top board 3 rotates up opens fixture, specimen holder end is inserted groove, be rotated down top board 3 again and be adjacent to test specimen 17, finally locking swings the nut on bolt respectively, realize the clamping of test specimen 17,
Described thermal field load-on module is: silicon nitride heating sheet 25 contacts with the bare terminal end of test specimen 17, the temperature of test specimen 17 measured by thermopair 16, and temperature signal is fed back to controller 22, controller 22 sends signal to stabilized voltage supply 23 again, change the voltage be applied on silicon nitride heating sheet 25, and then control the heating power of heating plate, make test specimen reach design temperature; Hard micarex 6 slows down heat velocity of propagation to the right, and increases thermograde, and be provided with runner in cooling Connection Block 7, chilled water flows into from water inlet 11, flows out after absorbing heat from opposite side water delivering orifice; Thermal insulation board 9 connects cooling Connection Block 7 and sensor below;
Described electric field load-on module is: lower platen 5 is fixedly connected with electrode 13 by brass screw 14, and the electric current that electric field power supply 21 exports imports in test specimen 17 by lower platen 5, and the fixture of the other end is connected to negative pole, forms closed-loop path;
Described magnetic field load-on module is: magnetic field power supply 24 passes into electric current to solenoid 1, and make test specimen 17 be among magnetic field, solenoid 1 is fixed on lower platen 5 by solenoid stationary magazine creel 2.According to Biot-Savart law, apart from current element
the magnetic induction density at arbitrfary point place is
In formula
for the magnetic permeability N/A in vacuum
2;
for the strength of current A by current element;
for the line element vector of current element;
for current element is to the radius vector m of arbitrfary point.
Groove on described lower platen 5 is provided with conical section, and it matches with test specimen tapered intermediate portion, and when test specimen 17 bears pulling force, the tapered intermediate portion of test specimen is stuck in the groove conical section of lower platen 5, namely realizes applying drag load to test specimen; After the bare terminal end of test specimen 17 is clamped completely, the bare terminal end opposed jaw of test specimen 17 has determines constant position, when fixing, a chucking position is constant, when another fixture is according to the orbiting motion that test specimen 17 is bending, namely realizes applying cantilever bending loads to test specimen 17; Two bare terminal ends of test specimen 17 are all tabular, and after its two bare terminal ends are respectively by two clamp, bare terminal end can, respectively along with two fixture synchronous axial system, when two fixtures relatively rotate, namely realize applying torsional load to test specimen 17.
The parallel length part of described test specimen 17 is cylindric, and the bare terminal end on both sides is the tabular that thickness is equal with body diameter, has tapered intermediate portion between bare terminal end and parallel length part.
Described hard micarex 6 can realize heat insulation, can realize again insulation, so both can play the effect reducing thermal conduction rate, increase thermograde, and can realize again the compatibility of water-cooled module and electric field load-on module, avoid being leaked electricity by chilled water.Itself density is large, has higher machining precision, can not affect the overall precision of device.
Described lower platen 5 is processed by austenitic stainless steel, can ensure the normal use of hot conditions, and lower platen 5 is processed with the groove matched with specimen holder end, ensures to transmit pulling force, moment of torsion and moment of flexure to test specimen (17).
There is cooling effect described cooling Connection Block 7 one aspect, there is connection function on the other hand, the left side is connected with lower platen 5 through hard micarex 6 by screw 20, screw 20 is longer, directly cannot be inserted into corresponding bolt hole from the part that cooling Connection Block 7 mid diameter is less, be mounting screw 20, on the right side of cooling Connection Block 7, have passing hole 10, screw 20 passes from the passing hole 10 on right side, is inserted in corresponding bolt hole; Be connected with sensor by studs 8 on the right of cooling Connection Block 7.
Electric field load-on module is by changing the voltage of electric field power supply 21, just can realize the loading of different electric current, insulation before and after hard micarex 6 ensures, lower platen 5, hard micarex 6 and cooling Connection Block 7 are connected by screw 20, bolt insulation sleeve 19 attachment screw 20 uses, and realizes insulation like this while guarantee effectively connects.
Magnetic field load-on module, by changing the electric current of magnetic field power supply 24, just can realize the change of magnetic field power.
Described solenoid 1 is fixed on lower platen 5 by solenoid stationary magazine creel 2, when not needing magnetic load-on module, dismantle lower from lower platen 5, and a solenoid 1 is respectively installed at the two ends of test specimen 17, ensure higher magnetic field intensity, the suitable length of solenoid 1, ensure that test specimen 17 has enough range of observation, solenoid 1 does not contact with test specimen 17, ensures that test specimen 17 freely can stretch, bends, reverses.
Another object of the present invention is to the multiple physical field coupling loading method providing a kind of multi-load to be coupled the piece fixture loaded, concrete steps are as follows:
Step 1: by the loading environment of computer settings multiple physical field;
Step 2: computing machine produces the drive singal controlling thermal field, electric field, magnetic field by signal generating module;
Step 3: by power amplifier, the drive singal exported in step 2 is amplified, output current signal;
Step 4: the current signal exported by step 3, drives stabilized voltage supply 23 to export default voltage-drop loading on silicon nitride heating sheet 25, realizes the loading of thermal field; The current signal exported by step 3, drives electric field power supply 21 to export the electric current preset, realizes the loading of electric field; The current signal exported by step 3, driving magnetic field power supply 24 exports the electric current preset, and realizes the loading in magnetic field;
Step 5: gather multiple physical field sensor signal by A/D capture card;
Step 6: be input in computing machine by the sensor signal of collection, compares with the setting value of computing machine, if meet test condition, then multiple physical field reaches setting value; Otherwise, return step 2 pair multiple physical field drive singal and adjust.
Beneficial effect of the present invention is: the piece fixture that multi-load coupling loads can transmit stretching, bending, torsion combined load simply, reliably, efficiently; Heating module is integrated in fixture inside, avoids heating module and the interference of observation module, avoid observation camera lens to be subject to higher temperature simultaneously; Silicon nitride heating sheet has quick heating, temperature high feature, can ensure comparatively fast to reach higher temperature; Electric field is loaded and is separated by insulcrete with chilled water, and both guarantees can be carried out simultaneously; Lower platen uses austenitic steel to process, and can ensure the usability under hot conditions; Magnetic field load-on module is not interfered with observation module, does not also affect the test that test specimen stretches, bends, reverses.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, and illustrative example of the present invention and explanation thereof, for explaining the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is overall appearance schematic diagram of the present invention;
Fig. 2 is overall cut-open view of the present invention;
Fig. 3 is thermal field principle schematic of the present invention;
Fig. 4 is principle of electric field schematic diagram of the present invention;
Fig. 5 is magnetic principles schematic diagram of the present invention;
Fig. 6 is circuit connection diagram of the present invention;
Fig. 7 is the structural representation of top board of the present invention;
Fig. 8 is the structural representation of lower platen of the present invention;
Fig. 9 is the cut-open view that the present invention cools Connection Block.
In figure: 1. solenoid, 2. solenoid stationary magazine creel, 3. top board, 4. heating plate pressing plate, 5. lower platen, 6. hard micarex, 7. cools Connection Block, 8. studs, 9. thermal insulation board, 10. passing hole, 11. water inlets, 12. swing bolt, 13. electrodes, 14. brass screws, 15. right straight pins, 16. thermopairs, 17. test specimens, 18. left straight pins, 19. bolt insulation sleeves, 20. screws, 21. electric field power supplys, 22. controllers, 23. stabilized voltage supplys, 24. magnetic field power supplies, 25. silicon nitride heating sheets.
Embodiment
Detailed content of the present invention and embodiment thereof is further illustrated below in conjunction with accompanying drawing.
See shown in Fig. 1 to Fig. 9, the piece fixture that multi-load coupling of the present invention loads, be applicable to apply to stretch to test specimen 17, clamping to test specimen sample under the load-up condition such as bending, torsion, this fixture also realizes thermal field to measured material sample by thermal field load-on module, electric field load-on module, magnetic field load-on module simultaneously, electric field loads with being coupled of magnetic field.
See Fig. 1, shown in Fig. 2, the concrete structure of described multi-load material in situ test fixture is: silicon nitride heating sheet 25 compresses by heating plate pressing plate 4, be fixed in the groove of top board 3, three connects into an entirety, top board 3 and lower platen 5 are by left straight pin 18 chain connection, lower platen 5 is processed with the groove identical with specimen holder end physical dimension, top board 3 rotates up opens fixture, specimen holder end is inserted the groove of lower platen 5, be rotated down top board 3 again and be adjacent to test specimen 17, finally locking swings the nut on bolt respectively, realize the clamping of test specimen 17.
The applying of described tensile load, groove on lower platen 5 has conical section to coordinate with test specimen 17 tapered intermediate portion, when test specimen 17 bears pulling force, the transition portion of test specimen 17 taper is stuck in the groove conical section of lower platen 5, can realize applying drag load to test specimen 17.
The applying of described bending load, after the bare terminal end of test specimen 17 is clamped completely, the bare terminal end opposed jaw of test specimen 17 has determines constant position, and when fixing, a chucking position is constant, when another fixture is according to the orbiting motion that test specimen is bending, can realize applying bending load to test specimen 17.
The applying of described torsional load, two bare terminal ends of test specimen 17 are all tabular, and after two bare terminal ends of test specimen 17 are respectively by two clamp, the bare terminal end of test specimen 17 can respectively along with two fixture synchronous axial system, when two fixtures relatively rotate, can realize applying torsional load to test specimen 17.
Shown in Fig. 2, Fig. 5 and Fig. 6, described thermal field load-on module is directly contacted with the bare terminal end of test specimen 17 by silicon nitride heating sheet 25 and heats, test specimen is made to reach test temperature as early as possible, the temperature of test specimen 17 measured by thermopair 16, and temperature signal is fed back to controller 22, controller 22 sends signal to stabilized voltage supply 23 again, changes the voltage be applied on silicon nitride heating sheet 25, and then controls the heating power of heating plate.Hard micarex 6 slows down heat velocity of propagation to the right, and increase thermograde, runner is had in cooling Connection Block 7, chilled water flows into from water inlet 11, flow out from opposite side water delivering orifice after absorbing heat, take away the heat that heating part conducts backward, thermal insulation board 9 connects cooling Connection Block 7 and sensor below, reduce thermal conduction rate, and increase thermograde.
Shown in Figure 4, electrode 13 is fixed on lower platen 5 by brass screw 14 by described electric field load-on module, and the electric current that electric field power supply 21 exports imports in test specimen 17 by lower platen 5, and the fixture of the other end is connected to negative pole, forms closed-loop path.The circuit of electric field connects shown in Figure 6, changes the voltage of electric field power supply 21, just can realize the loading of different electric current.The insulation of electric field is shown in Figure 2, the insulation before and after hard micarex 6 ensures, lower platen 5, hard micarex 6 and cooling Connection Block 7 are connected by screw 20, and bolt insulation sleeve 19 attachment screw 20 uses, and realizes insulation like this while guarantee effectively connects.
Described magnetic field loading principle is shown in Figure 5, and magnetic field power supply 24 passes into electric current to solenoid 1, and test specimen 17 is among magnetic field.The circuit in magnetic field connects shown in Figure 6, changes the electric current of magnetic field power supply 24, just can realize the change of magnetic field power.The installation in magnetic field is shown in Figure 2, and solenoid 1 is fixed on lower platen 5 by coil stationary magazine creel 2, according to Biot-Savart law, apart from current element
the magnetic induction density at arbitrfary point place is
In formula
for the magnetic permeability (N/A in vacuum
2);
for the strength of current (A) by current element;
for the line element vector of current element;
for current element is to the radius vector (m) of arbitrfary point.
Shown in Figure 2, described solenoid 1 is fixed on lower platen 5 by solenoid stationary magazine creel 2, when not needing magnetic load-on module, dismantle lower from lower platen 5, and a solenoid 1 is respectively installed at the two ends of test specimen 17, ensures higher magnetic field intensity, the suitable length of solenoid 1, ensure that test specimen 17 has enough range of observation, solenoid 1 does not contact with test specimen 17, ensures that test specimen 17 freely can stretch, bends, reverses.
Shown in Figure 2, described hard micarex 6 can realize heat insulation, can realize again insulation, so just can ensure that chilled water and electric field can load simultaneously, and can not occur by chilled water leaky.
Described silicon nitride heating sheet 25 heating-up temperature is high, and firing rate is fast.
Described lower platen 5 is processed by austenitic stainless steel, can ensure the normal use of hot conditions, and lower platen 5 is milled with the groove adapted with specimen holder end, ensures to transmit pulling force, moment of flexure and moment of torsion to test specimen.
There is cooling effect described cooling Connection Block 8 one aspect, has connection function on the other hand, and the left side is connected with lower platen 5 through hard micarex 6 by screw 20.Screw 20 is longer, directly cannot be inserted into corresponding bolt hole from the part that cooling Connection Block 7 mid diameter is less, be mounting screw 20, on the right side of cooling Connection Block 7, have passing hole 10, screw 20 is whole to be passed from the passing hole 10 on right side, is inserted in corresponding bolt hole.Be connected with sensor by studs 8 on the right of cooling Connection Block 7.
Described electric field load-on module is by changing the voltage of electric field power supply 21, just can realize the loading of different electric current, insulation before and after hard micarex 6 ensures, lower platen 5, hard micarex 6 and cooling Connection Block 7 are connected by screw 20, bolt insulation sleeve 19 attachment screw 20 uses, and realizes insulation like this while guarantee effectively connects.
Circuit connection diagram shown in Figure 6, electric field power supply 21 is powered to electrode 13, stabilized voltage supply 23 is powered to silicon nitride heating sheet 25, magnetic field power supply 24 is powered to solenoid 1, the control of three all controlled devices 22 of power supply, and controller 22 also will receive the signal of thermopair 16, realizes the closed-loop control of thermal field.
Described solenoid 1 is fixed on lower platen 5 by solenoid stationary magazine creel 2, when not needing magnetic load-on module, dismantle lower from lower platen 5, and a solenoid 1 is respectively installed at the two ends of test specimen 17, ensure higher magnetic field intensity, the suitable length of solenoid 1, ensure that test specimen 17 has enough range of observation, solenoid 1 does not contact with test specimen 17, ensures that test specimen 17 freely can stretch, bends, reverses.
Shown in Figure 6, described multiple physical field loading method, concrete steps are as follows:
Step 1: by the loading environment of computer settings multiple physical field;
Step 2: computing machine produces the drive singal controlling thermal field, electric field, magnetic field by signal generating module;
Step 3: by power amplifier, the drive singal exported in step 2 is amplified, output current signal;
Step 4: the current signal exported by step 3, drives stabilized voltage supply 23 to export certain voltage-drop loading on silicon nitride heating sheet 25, realizes the loading of thermal field; The current signal exported by step 3, drives electric field power supply 21 to export certain electric current, realizes the loading of electric field; The current signal exported by step 3, driving magnetic field power supply 24 exports certain electric current, realizes the loading in magnetic field;
Step 5: gather multiple physical field sensor signal by A/D capture card;
Step 6: be input in computing machine by the sensor signal of collection, compares with the setting value of computing machine, if meet test condition, then multiple physical field reaches setting value; Otherwise, return step 2 pair multiple physical field drive singal and adjust.
Shown in Figure 7, described top board 4, Qi Tezhengyushi body stainless steel processes, the normal use of hot conditions can be ensured, upper end has the groove adapted with silicon nitride heating sheet 25 profile, four bolts hole around for installing heating plate pressing plate 4, and compress silicon nitride heating sheet 25 by heating plate pressing plate 4.Following pin-and-hole is for realizing the chain connection of upper pressure 4 plate and lower platen 5.
Shown in Figure 8, described lower platen 5, is characterized in that being processed by austenitic stainless steel, can ensure the normal use of hot conditions, and lower platen 5 is milled with the groove adapted with specimen holder end, ensure to test specimen transmission stretching, bending, torsion combined load.The pin-and-hole in left side, for installing left straight pin 18, interference fit, realizes the chain connection of top board 3 and lower platen 5.The pin-and-hole on right side, for installing right straight pin 15, interference fit, realizes the chain connection swinging bolt 12 and lower platen 5.
Shown in Figure 9, described cooling Connection Block 7 is characterized in that there is cooling effect on the one hand, and inside has coolant flow channel, and the flow direction of chilled water as shown by arrows; Have connection function on the other hand, the left side is connected with lower platen 5 through hard micarex 6 by screw 20.Screw 20 is longer, directly cannot be inserted into corresponding bolt hole from the part that cooling Connection Block 7 mid diameter is less, be mounting screw 20, on the right side of cooling Connection Block 7, have passing hole 10, screw 20 is whole to be passed from the passing hole 10 on right side, is inserted in corresponding bolt hole.Be connected with sensor by studs 8 on the right of cooling Connection Block 7.
Outstanding feature of the present invention is to provide a kind of multi-load piece fixture that coupling loads, and can transmit stretching, bending, torsion combined load simply, reliably, efficiently; A kind of multiple physical field coupling loading method is provided, heating module is integrated in fixture inside, avoid heating module and the interference of observation module, avoid observation camera lens to be subject to higher temperature simultaneously; Silicon nitride heating sheet 25 has quick heating, temperature high feature, can ensure comparatively fast to reach higher temperature; Electric field is loaded and is separated by insulcrete with chilled water, and both guarantees can be carried out simultaneously; Lower platen 5 uses austenitic steel to process, and can ensure the usability under hot conditions; Magnetic field load-on module is not interfered with observation module, does not also affect the test that test specimen 17 stretches, bends, reverses.
The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All any amendments made for the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the piece fixture of a multi-load coupling loading, it is characterized in that: for applying to stretch to test specimen (17), bending, to the clamping of test specimen under torsional load condition, simultaneously by thermal field load-on module, electric field load-on module, magnetic field load-on module realizes the thermal field to measured material sample, electric field loads with being coupled of magnetic field, silicon nitride heating sheet (25) compresses by heating plate pressing plate (4), be fixed in the groove of top board (3), three connects into an entirety, top board (3) and lower platen (5) are by left straight pin (18) chain connection, lower platen (5) is provided with the groove identical with specimen holder end physical dimension, top board (3) rotates up opens fixture, specimen holder end is inserted groove, be rotated down top board (3) again and be adjacent to test specimen (17), finally locking swings the nut on bolt respectively, realize the clamping of test specimen (17),
Described thermal field load-on module is: silicon nitride heating sheet (25) contacts with the bare terminal end of test specimen (17), the temperature of test specimen (17) measured by thermopair (16), and temperature signal is fed back to controller (22), controller (22) sends signal to stabilized voltage supply (23) again, change the voltage be applied on silicon nitride heating sheet (25), and then control the heating power of heating plate, make test specimen reach design temperature; Hard micarex (6) slows down heat velocity of propagation to the right, and increases thermograde, is provided with runner in cooling Connection Block (7), and chilled water flows into from water inlet (11), flows out after absorbing heat from opposite side water delivering orifice; Thermal insulation board (9) connects cooling Connection Block (7) and sensor below;
Described electric field load-on module is: lower platen (5) is fixedly connected with electrode (13) by brass screw (14), the electric current that electric field power supply (21) exports imports in test specimen (17) by lower platen (5), the fixture of the other end is connected to negative pole, forms closed-loop path;
Described magnetic field load-on module is: magnetic field power supply (24) passes into electric current to solenoid (1), and make test specimen (17) be among magnetic field, solenoid (1) is fixed on lower platen (5) by solenoid stationary magazine creel (2).
2. the piece fixture of multi-load coupling loading according to claim 1, it is characterized in that: the groove on described lower platen (5) is provided with conical section, and it matches with test specimen tapered intermediate portion, when test specimen (17) bears pulling force, the tapered intermediate portion of test specimen is stuck in the groove conical section of lower platen (5), namely realizes applying drag load to test specimen; After the bare terminal end of test specimen (17) is clamped completely, the bare terminal end opposed jaw of test specimen (17) has determines constant position, when fixing, a chucking position is constant, when another fixture is according to the orbiting motion that test specimen (17) is bending, namely realizes applying cantilever bending loads to test specimen (17); Two bare terminal ends of test specimen (17) are all tabular, and after its two bare terminal ends are respectively by two clamp, bare terminal end can, respectively along with two fixture synchronous axial system, when two fixtures relatively rotate, namely realize applying torsional load to test specimen (17).
3. the piece fixture of multi-load coupling loading according to claim 1 and 2, it is characterized in that: the parallel length part of described test specimen (17) is cylindric, the bare terminal end on both sides is the tabular that thickness is equal with body diameter, has tapered intermediate portion between bare terminal end and parallel length part.
4. the piece fixture of multi-load coupling loading according to claim 1 and 2, it is characterized in that: described lower platen (5) is processed by austenitic stainless steel, lower platen (5) is processed with the groove matched with specimen holder end, ensures to transmit pulling force, moment of torsion and moment of flexure to test specimen (17).
5. the piece fixture of multi-load coupling loading according to claim 1, it is characterized in that: described cooling Connection Block (7) left side is connected with lower platen (5) through hard micarex (6) by screw (20), cooling Connection Block (7) right side has passing hole (10), screw (20) passes from passing hole (10), is inserted in bolt hole; Cooling Connection Block (7) the right is connected with sensor by studs (8).
6. the piece fixture of multi-load coupling loading according to claim 1, it is characterized in that: described solenoid (1) is fixed on lower platen (5) by solenoid stationary magazine creel (2), a solenoid (1) is respectively installed at the two ends of test specimen (17)
,solenoid (1) does not contact with test specimen (17), ensures that test specimen (17) freely stretches, bends, reverses.
7. a multiple physical field coupling loading method for the piece fixture of multi-load coupling loading according to claim 1, is characterized in that: concrete steps are as follows:
Step 1: by the loading environment of computer settings multiple physical field;
Step 2: computing machine produces the drive singal controlling thermal field, electric field, magnetic field by signal generating module;
Step 3: by power amplifier, the drive singal exported in step 2 is amplified, output current signal;
Step 4: the current signal exported by step 3, drives stabilized voltage supply (23) to export default voltage-drop loading on silicon nitride heating sheet (25), realizes the loading of thermal field; The current signal exported by step 3, drives electric field power supply (21) to export the electric current preset, realizes the loading of electric field; The current signal exported by step 3, driving magnetic field power supply (24) exports the electric current preset, and realizes the loading in magnetic field;
Step 5: gather multiple physical field sensor signal by A/D capture card;
Step 6: be input in computing machine by the sensor signal of collection, compares with the setting value of computing machine, if meet test condition, then multiple physical field reaches setting value; Otherwise, return step 2 pair multiple physical field drive singal and adjust.
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| CN109470476B (en) * | 2019-01-14 | 2023-06-27 | 扬州大学 | Torsional fatigue test device and method for vibration reduction gear |
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| CN110320104A (en) * | 2019-07-08 | 2019-10-11 | 山东大学 | It is a kind of can the cooling rock multi- scenarios method test integrated loading device of water and method |
| CN112067038A (en) * | 2020-05-28 | 2020-12-11 | 北京机械设备研究所 | Test platform for multi-physical field dynamic response under transient strong electric heating and mechanical loading device |
| CN112698056A (en) * | 2020-12-07 | 2021-04-23 | 西安交通大学 | Magnetic-force electric coupling loading system for atomic force microscope |
| CN114002064A (en) * | 2021-11-02 | 2022-02-01 | 重庆邮电大学 | Multi-medium-based biaxial stretching instrument capable of adopting and disassembling clamp |
| CN114216847A (en) * | 2021-11-19 | 2022-03-22 | 南方科技大学 | Constant-temperature single-point scratching experimental device, feeding system thereof and single-point scratching experimental method |
| CN114216847B (en) * | 2021-11-19 | 2024-01-16 | 南方科技大学 | Constant-temperature single-point scratching experiment device, feeding system thereof and single-point scratching experiment method |
| CN114526995B (en) * | 2022-04-22 | 2022-07-15 | 成都理工大学 | Pipeline magnetization simulation detection system under action of composite load |
| CN114526995A (en) * | 2022-04-22 | 2022-05-24 | 成都理工大学 | Pipeline magnetization simulation detection system under action of composite load |
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