CN202533335U - Multi-head creep testing device for miniature samples - Google Patents
Multi-head creep testing device for miniature samples Download PDFInfo
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- CN202533335U CN202533335U CN2011205737406U CN201120573740U CN202533335U CN 202533335 U CN202533335 U CN 202533335U CN 2011205737406 U CN2011205737406 U CN 2011205737406U CN 201120573740 U CN201120573740 U CN 201120573740U CN 202533335 U CN202533335 U CN 202533335U
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Abstract
The utility model provides a multi-head creep testing device for miniature samples. The multi-head creep testing device comprises a loading system, a clamping system, a heating system, a temperature control system, a measuring system and an external support. The loading system loads vertically at the top ends of weights and is located on the upper portion of the external support. The clamping system is fixed on the external support and located below the loading system and inside the heating system. The heating system provided with the temperature control system outside is connected with the bottom of the external support. The measuring system is connected with the loading system and the external support and located on the upper portion of the external support. Independent parts are connected by the external support to form a multi-head creep device system. By the multi-head creep testing device, the problem that existing creep testing devices cannot perform multi-head creep testing to miniature samples is solved, creep testing for a plurality of miniature samples of identical or different sizes under a certain working condition can be realized by the creep testing device and a creep testing method, and creep testing for various types of samples such as cantilever samples, three-point bending parts, four-point bending parts and small punching rods can be realized by replacing clamps.
Description
Technical field
The utility model relates to a kind of device of novel test material at high temperature croop property, especially a kind of bull microspecimen creep test device.
Background technology
There are many metal constructions under hot environment, to work for a long time in the industries such as oil, chemical industry, Aero-Space and nuclear power; Creep is the principal mode that these thermal structures destroy; The application of high temperatures structural intergrity is theoretical; Accurately estimate the residual life at the labour high-temperature component, being on active service for the safety that guarantees the high temperature bearing carrier has great importance.
Predict that the security of this class formation and the basic premise of residual life are to obtain these high-temperature behavior parameters at the labour member.Common method is to obtain these parameters through the standard sample uniaxial static creep test, but the standard sample size is bigger, often needs more material, draws materials in a large number and can bring destruction to original equipment, influences the normal operation of equipment; For tubular element (heat exchanger tube, boiler tube) or some small device, desirable volume of sample is too little, can't satisfy the requirement of traditional experiment to specimen size, thereby causes test to carry out.And non-standard microspecimen stress state is complicated, more can reflect the true stressing conditions of member, and therefore adopting microspecimen to make an experiment is comparatively desirable method.
The small drill drift creepage test method is the more micro-test sample creep test method of studying at present, and it is few to draw materials, and has harmless (or partly harmless) and the double dominant easily of taking a sample concurrently, is a kind of economical and effective safety detection means.But the test findings of small punch creep test receives the influence of external factor such as anchor clamps, drift size bigger, makes that the data of small punch creep test are deficient, creep experimental data when especially lacking length; In addition, the various countries researcher there are differences on used sample, load mode, makes test figure to compare.These are very unfavorable with the related aspect of traditional uniaxial static creep test for the test of research small drill drift creepage.
Three-point bending and four-point bending test; Sample is simple, easy to operate; Data through bending creep test; The creep energy of activation Q of stress and strain, the assessment material of the convertible uniaxial tensile test that obtains equivalence, the microstructure and the analysis of material creep mechanical property of research bend specimen, but the material at high temperature performance data that the bending creep test through micro-test sample obtains is less.
The micro-test sample creep test is mostly on traditional uniaxial static creep test machine at present, realizes creep test through improvement or design special anchor clamps.For the micro-test sample creep test, required test load is less, is in the Load Control lower limit of traditional creep testing machine, and original Load Control error will be greater than the influence to traditional large dimension specimen to the influence of micro-test sample; Simultaneously; At present the micro-test sample creep test device once can only carry out the creep test of a sample, and required test period is long, experimentation cost is high, and sample of living in environment is consistent can not guarantee to test the time at every turn; Increase the variable number of systematic error, reduced the comparability of test figure.
Summary of the invention
The purpose of the utility model is intended to overcome the problem of above-mentioned existence, and a kind of bull micro-test sample creep test device of test material croop property is provided.
The utility model is realized through following technical scheme:
A kind of bull microspecimen creep test device is characterized in that described device comprises outside support, loading system, measuring system, mounting and clamping system and heating and temperature control system; Described outside support comprises a base 23, is connected four pillars 3 on the base 23, and upper cover plate 5 is supported by four pillars 3; Described heating and temperature control system comprise that one has the high temperature furnace 4 of temperature controller 1, are fixed on through grate 22 on the base 23 of outside support, and thermopair 2 is fixed on the micro-test sample of being tested 30; Described loading system comprises; Be installed on the orienting sleeve 12 on the upper cover plate 5 of outside support; By 13 tightenings of orienting sleeve set nut, at least two depression bars 14, its upper end is passed orienting sleeve 12 and is threaded with weight tray 11; Weight tray 11 cooperates with orienting sleeve 12, and the lower end of depression bar 14 is stretched in the high temperature furnace 4 and contacted with pressure head 15; Described measuring system comprises two support bars 6 that are fixed on the upper cover plate 5; By sensor clamp 7 displacement transducer 8 clampings are being measured on the support bar 6; Measurement plate 10 is installed on the weight tray 11 and with weight tray 11 and moves up and down; The probe of displacement transducer 8 vertically is contacted with on the measurement plate 10 on the weight tray 11, and displacement transducer 8 is through the data acquisition card connection of cable and industrial computer 38; Said mounting and clamping system comprises that a lower end is fixed on the pillar 21 on the base 23; The upper end of pillar 21 is stretched in the heating furnace 4 and is connected with built-up jig 26 through screw thread and flat key 20; Described built-up jig 26 comprises a chassis 17; At least one pair of anchor clamps is that symmetric points are uniformly set on the chassis 17 along circumference with the center of circle, and described anchor clamps comprise following three kinds of structures:
The first anchor clamps 33a comprises that a guiding patrix 25 is fixed on the chassis 17 by lock-screw 24; Have chassis groove 35 on the chassis 17; Comprise that also one compresses patrix 16 and is threaded with chassis 17, an end of micro-test sample 30 is fastened on by housing screw 27 on the cell wall of chassis groove 35, and the other end of micro-test sample 30 is unsettled to be positioned in the chassis groove 35 pressure head 15 that passes guiding patrix 25 by a lower end and to hold out against; The upper end of pressure head 15 holds out against depression bar 14, and the lower end of pressure head 15 is a semi-cylindrical.
The second anchor clamps 33b comprises that a guiding patrix 25 is fixed on the chassis 17 by lock-screw 24, has chassis groove 35, guiding patrix 25 and chassis groove 35 corresponding bottom surface portions on the chassis 17; Have one and chassis groove 35 corresponding upper grooves 36; Micro-test sample 30 is supported by two support rollers 31 and places in the chassis groove 35, and one or two pressure heads 15 are set, and its lower end is passed guiding patrix 25 and held out against micro-test sample 30; Pressure head 15 upper ends hold out against depression bar 14, and the lower end of pressure head 15 is a semi-cylindrical;
The 3rd anchor clamps 33c comprises that a guiding patrix 25 is fixed on the chassis 17 by lock-screw 24, has chassis groove 35, guiding patrix 25 and chassis groove 35 corresponding bottom surface portions on the chassis 17; Have a boss 37 that matches with chassis groove 35; Micro-test sample 30 is positioned in the chassis groove 35, and ceramic bead 39 places on the micro-test sample 30, and a pressure head 15 is set; Its lower end holds out against ceramic bead 39 in the middle of passing boss 37; Pressure head 15 upper ends hold out against depression bar 14, and pressure head 15 is a hollow tube, and the internal diameter of pipe is not more than the diameter of ceramic bead 39.
The chassis groove 35 perforation chassis 17 of described the 3rd anchor clamps 33c, 17 bottom perforation place is provided with a plug 41 and is threaded with chassis 17 on the chassis.
The described first anchor clamps 33a, the second anchor clamps 33b, the 3rd anchor clamps 33c can respectively or be combined into being installed on the chassis 17.
The beneficial effect of the utility model:
1, the utility model can carry out the creep test of a plurality of samples simultaneously, can guarantee to be in work under the identical environment with batch to be tested, reduces the dispersiveness of creep experimental data, shortens the creep test time relatively.
2, the utility model adopts microspecimen to carry out creep test, draws materials less, sample structure is simple, and is little to the damage that causes in the sampling of labour equipment.
3, the built-up jig of the utility model and column adopt and are threaded, and only need to change the type of built-up jig, just can carry out dissimilar creep tests such as cantilever sample, 3 curved samples, 4 curved samples, little jumper bar sample.
4, the utility model adopts counterweight to load, and has avoided the load fluctuation in the process of the test, has simplified the power down process process in the creep test simultaneously.
5, the utility model adopts displacement transducer to write down the deformation data of sample continuously, automatically, the test figure precision is provided, has reduced workload.
Description of drawings
Fig. 1 is a bull microspecimen creep test device front schematic view.
Wherein, 1: temperature controller, 2: thermopair, 3: pillar, 4: high temperature furnace, 5: upper cover plate, 6: measure support bar, 7: sensor clamp, 8; Displacement transducer, 9: counterweight, 10: measure plate, 11: weight tray, 12: orienting sleeve; 13: orienting sleeve set nut, 14: depression bar, 15: pressure head, 16: compress patrix; 17: chassis, 18: column set nut, 19: sleeve, 20: flat key; 21: column, 22: grate, 23: base, 38: industrial computer.
Fig. 2 is a bull microspecimen creep test device side schematic view.
Wherein, 3: pillar, 4: high temperature furnace, 5: upper cover plate, 6: measure support bar, 7: the sensor clamp; 8: displacement transducer, 9: counterweight, 10: measure plate, 11: weight tray, 12: orienting sleeve; 13: orienting sleeve set nut, 14: depression bar, 21: column, 22: grate, 23: base.
Fig. 3 is six microspecimen creep test device built-up jig synoptic diagram, and these anchor clamps can once be accomplished the creep test of 6 micro-test samples.
Wherein, 15: pressure head, 16: compress patrix, 17: chassis, 18: column set nut, 21: column, 24: lock-screw, 25: guiding patrix, 26: built-up jig, 27: housing screw, 30: micro-test sample.
Fig. 4 is a four-head microspecimen creep test device built-up jig synoptic diagram.These anchor clamps can once be accomplished the creep test of 4 micro-test samples.
Wherein, 15: pressure head, 16: compress patrix, 17: chassis, 18: column set nut, 21: column, 24: lock-screw, 25: guiding patrix, 26: built-up jig, 27: housing screw, 30: micro-test sample.
Fig. 5 is two microspecimen creep test device built-up jig synoptic diagram.These anchor clamps can once be accomplished the creep test of 2 micro-test samples.
Wherein, 15: pressure head, 16: compress patrix, 17: chassis, 18: column set nut, 21: column, 24: lock-screw, 25: guiding patrix, 26: built-up jig, 27: housing screw, 30: micro-test sample.
Fig. 6 is the structural representation of the first anchor clamps 33a of test cantilever microspecimen.
Wherein, 14: depression bar, 15: pressure head, 16: compress patrix, 17: chassis, 24: lock-screw, 25: guiding patrix, 27: housing screw, 30: micro-test sample, 35: the chassis groove.
Fig. 7 is the second anchor clamps 33b structural representation of 3 curved microspecimens of test.
Wherein, 14: depression bar, 15: pressure head, 17: chassis, 24: lock-screw, 25: guiding patrix, 30: micro-test sample, 31: support rollers, 36: upper groove.
Fig. 8 is the second anchor clamps 33b structural representation of 4 curved microspecimens of test.
Wherein, 14: depression bar, 15: pressure head, 17: chassis, 24: lock-screw, 25: guiding patrix, 30: micro-test sample, 31: support rollers, 36: upper groove.
Fig. 9 is the 3rd an anchor clamps 33c structural representation of the little jumper bar microspecimen of test.
Wherein, 14: depression bar, 15: pressure head, 17: chassis, 24: lock-screw, 25: guiding patrix, 30: micro-test sample, 35: chassis groove, 37: boss, 39: ceramic bead, 41: plug.
Figure 10 is for test the built-up jig structural representation of cantilever microspecimen, 3 curved microspecimens, little jumper bar microspecimen simultaneously.
Wherein, 15: pressure head, 16: compress patrix, 17: chassis, 18: column set nut, 21; Column, 24; Lock-screw, 25: guiding patrix, 26; Built-up jig, 27: housing screw, 30: micro-test sample, 33a: first anchor clamps, 33b: second anchor clamps, 33c: the 3rd anchor clamps.
3 curved micro-test sample creeping displacement curves of Figure 11.
The graph of a relation of 3 curved micro-test sample loaded line displacement minimized creep rates of displacement of Figure 12 and load.
Figure 13 3 curved, little jumper bar micro-test sample creeping displacement curves.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further elaboration:
Outside support comprises pillar 3, upper cover plate 5 and base 23.Upper cover plate 5 is propped up by four pillars 3 that are installed on the base 23.The part of displacement measurement system and loading system is installed on the upper cover plate 5, and wherein the orienting sleeve in the loading system 12 is fixed on the upper cover plate 5.
Loading system comprises pressure head 15, depression bar 14, orienting sleeve 12, orienting sleeve set nut 13, weight tray 11 and counterweight 9; Load mode adopts the top vertical loading; Orienting sleeve 12 is installed on the outside support upper cover plate 5, and by 13 tightenings of orienting sleeve set nut, weight tray 11 forms with orienting sleeve 12 and is dynamically connected; By orienting sleeve 12 assurance top load vertical loading; Weight tray 11 is threaded with depression bar 14, and depression bar 14 contacts with pressure head 15 but is not connected, with the loading deviation of avoiding coaxiality error to cause.
Heating and temperature control system comprise thermopair 2, high temperature furnace 4, grate 22 and temperature controller 1.Thermopair 2 is used for the temperature control of high temperature furnace 4 and the temperature survey of micro-test sample 30, is connected on the industrial computer to show, write down temperature value.Grate 22 threaded one ends are connected on the high temperature furnace 4, and the other end is placed on the base 23, and the upper-lower position of high temperature furnace 4 is adjustable.High temperature furnace 4 is the rectangle stove of simple gate open-type, and it is convenient that sample is installed.Heating system is positioned at the middle part of whole device.
Measuring system comprises measures support bar 6, sensor clamp 7, measurement plate 10, displacement transducer 8, data collecting card, industrial computer 38 and data acquisition software.Install and measure support bar 6 on the upper cover plate 5, measure sensor installation clamp 7 on the support bar 6, clamping displacement transducer 8; Measuring plate 10 is installed on the weight tray 11; Move up and down with weight tray, the probe of displacement transducer 8 vertically is contacted with to be measured on the plate 10, and displacement transducer also is connected on the data collecting card of industrial computer through cable; The data acquisition software interface of industrial computer can show displacement curve and write down shift value over time, and then data are handled, analyzed.It is PCI-9221 that displacement transducer 8 is selected linear differential displacement transducer, data collecting card model for use; Data acquisition software is selected LabView 2009 for use, compiling data acquisition program, the automatic record of realization displacement data; And can SF be set according to the requirement of process of the test.
Mounting and clamping system comprises column 21, flat key 20, sleeve 19, set nut 18 and built-up jig 26.Built-up jig 26 is connected through two set nuts 18 with column 21, and micro-test sample 30 places in the built-up jig 26, is provided with flat key 20 between the chassis 17 of built-up jig 26 and the column 21, only needs to rotate the relative position of the just adjustable chassis assembly 17 of column 21.
Mounting and clamping system of the present invention can be arranged to six, four-head and two (being on the chassis of built-up jig six pairs, four pairs and two pairs of anchor clamps to be installed respectively), and six, four and two samples can be installed simultaneously.
With reference to accompanying drawing 1,2, bull micro-test sample creep test device mainly is made up of loading system, mounting and clamping system, heating and temperature control system, measuring system and outside support.
With reference to accompanying drawing 3,6; With cantilever sample built-up jig is example; The anchor clamps 33a of built-up jig 26 comprises chassis 17, compresses patrix 16, lock-screw 24, guiding patrix 25 and housing screw 27 are formed, and compresses patrix 16, guiding patrix 25 connects through lock-screw 24 with chassis 17.As shown in Figure 6, the chassis groove 35 on chassis 17 screws in the housing screw 27 that compresses in the patrix 16 and compresses the micro-test sample stiff end in order to lay cantilever micro-test sample 30, and depression bar 14 transfers loads on the cantilever micro-test sample 30 through pressure head 15.
With reference to accompanying drawing 4, the difference of four-head microspecimen creep test device is built-up jig is replaced by four-head.Built-up jig is set to four-head, is after considering imposed load, and the stressed symmetry of should trying one's best of each sample is avoided anchor clamps caused by out-of-balance force and toppled.With the cantilever sample is example, and built-up jig 26 comprises chassis 17, compresses patrix 16, lock-screw 24, guiding patrix 25 and housing screw 27 are formed, and compresses patrix 16, guiding patrix 25 connects through lock-screw 24 with chassis 17.But, open four chassis grooves 35 above the disk clamp, device once carries out the creep test of 4 cantilever samples.
Difference with reference to 5, two microspecimen creep test devices of accompanying drawing is built-up jig is replaced by two.Built-up jig is set to two, is after considering imposed load, and the stressed symmetry of should trying one's best of each sample is avoided anchor clamps caused by out-of-balance force and toppled.With the cantilever sample is example, and built-up jig 26 comprises chassis 17, compresses patrix 16, lock-screw 24, guiding patrix 25 and housing screw 27 are formed, and compresses patrix 16, guiding patrix 25 connects through lock-screw 24 with chassis 17.But, open 2 chassis grooves 35 above the disk clamp, device once can only carry out the creep test of 2 cantilever samples at most.
With reference to accompanying drawing 7, the built-up jig of bull microspecimen creep test device is 3 curved microspecimen built-up jigs.3 curved micro-test sample built-up jigs comprise chassis 17, lock-screw 24, guiding patrix 25 and cylinder support rollers 31 compositions, and guiding patrix 25 connects through lock-screw 24 with chassis 17.Wherein, cylinder support rollers 31 is positioned at the chassis groove 35 on the chassis 17, and micro-test sample is positioned on the support rollers 31, exceeds the upper surface 0.5mm of disk clamp 28, and pressure head 15 passes the hole in the guiding patrix 25, on loading to three a curved micro-test sample 30.
With reference to accompanying drawing 8, the built-up jig of bull microspecimen creep test device is 4 curved micro-test sample built-up jigs.4 curved micro-test sample built-up jigs comprise chassis 17, guiding patrix 25, lock-screw 24 and cylinder support rollers 31 compositions with 3 curved basically identicals, and guiding patrix 25 connects through lock-screw 24 with chassis 17.Wherein, cylinder support rollers 31 is positioned at the chassis groove 35 on the chassis 17, and micro-test sample 30 is positioned on the support rollers 31, exceeds the upper surface 0.5mm on chassis 17.Different with 3 curved situations, the pressure head 15 of 4 curved built-up jigs has two load(ing) points, and pressure head 15 passes the hole in the guiding patrix 25, on loading to four a curved micro-test sample 30.
With reference to accompanying drawing 9, the built-up jig of bull microspecimen creep test device is little punching micro-test sample built-up jig.Little punching micro-test sample creep test device comprises chassis 17, guiding patrix 25, lock-screw 24, ceramic bead 39 and plug 41 compositions.Guiding patrix 25 connects through lock-screw 24 with chassis 17.Wherein, have chassis groove 35 on the chassis 17, guiding patrix 25 bottoms are boss; Cooperate with chassis groove 35, micro-test sample 30 is put into the groove on chassis 17, behind the locking guiding patrix 25; The gap that patrix bottom surface and micro-test sample upper surface should keep 0.1mm makes micro-test sample be in the stress free state.The guiding patrix 25 the middle part have manhole, pressure head 15 punching press ceramic beads 39, with loading to little punching micro-test sample 30.Have manhole in the chassis groove 35 on chassis 17, screw plug 41 is equipped with in the bottom, is used for micro-test sample fracture back and collects ceramic bead 39.
With reference to accompanying drawing 10, the built-up jig of bull microspecimen creep test device is the array configuration of three kinds of dissimilar specimen holders.The array configuration of three kinds of dissimilar specimen holders comprises the first anchor clamps 33a, the second anchor clamps 33b, the 3rd anchor clamps 33c; Three groups of anchor clamps mounted in pairs; On chassis 17, be symmetrically distributed, on same chassis, just can carry out the creep test of three types of cantilever micro-test samples, the curved micro-test sample of three (four) points, little punching micro-test sample.
Bull microspecimen creep test method: with the cantilever sample is example; Micro-test sample 30 is packed in the chassis groove 35 on chassis 17; To compress patrix 16 with lock-screw 24 and be fixed on the chassis 17, and screw in housing screw 27 and compress cantilever micro-test sample 30, guiding patrix 25 will be installed subsequently.Treat that sample packs into behind the built-up jig, be connected on the column 21, then thermopair 2 is installed on the micro-test sample 30 with two nuts 18.Because this device adopts counterweight top vertical loading; The parts that sample top loading system is comprised all should be as the load of sample; Therefore before loading system is installed, answer the weight of weighing pressure head 15, depression bar 14 and weight tray 11, with this weight preloading as creep test.Pressure head 15 is installed, depression bar 14 is screwed in weight tray 11 bottoms, pass orienting sleeve 12 from top to bottom.After the depression bar 14 and the pressure head 15 of micro-test sample all installs, rotate column 21, the depression bar 14 of each micro-test sample is positioned on the same axis with pressure head 15 as far as possible, but do not apply counterweight load this moment.Displacement transducer 8 is installed on the sensor clamp 7, and adjustment sensor clamp 7 is pressed on it and measures on the plate 10 in the position of measuring on the support bar 6.After treating that all micro-test samples install; Close high temperature furnace 4, heat up, be heated to set point of temperature, after a period of time is treated temperature stabilization in insulation; Apply counterweight load 9 step by step, reposefully, notice that the load of sample is the weight and counterweight load 9 sums of pressure head 15, depression bar 14, weight tray 11.After load applies and finishes, on the displacement acquisition interface of industrial computer,, and the shift value of each sample of opening entry, show displacement curve with sensor 8 zeroing.
Embodiment 1: 3 curved micro-test sample creep tests under uniform temp, the different loads
(being of a size of 20 * 5 * 1.5mm) packs in the chassis groove 35 on chassis 17 with 3 curved micro-test samples 30;, guiding patrix 25 is installed, treat that six micro-test samples all pack into behind the built-up jig 26; Be connected on the column 21 with two column set nuts 18, thermopair 2 is installed.The weight of weighing pressure head 15, depression bar 14 and weight tray 11 is with this weight preloading as creep test.Pressure head 15 is installed, depression bar 14 is screwed in weight tray 11 bottoms, pass orienting sleeve 12 from top to bottom.After installing, the fine rotation column makes the pressure head of each micro-test sample contact and be adjusted on the same axis direction with depression bar, but does not apply counterweight load this moment.Displacement transducer 8 is installed on the sensor clamp 7, and adjustment sensor clamp 7 is pressed on it and measures on the plate 10 in the position of measuring support bar 6.Close electric furnace 4, intensification, insulation a period of time apply counterweight load 9 after treating temperature stabilization step by step, reposefully, notice that the load of sample is the weight and counterweight load 9 sums of pressure head 15, depression bar 14, weight tray 11.After load applies and finishes, on the displacement acquisition interface of industrial computer,, and the shift value of each sample of opening entry, show displacement curve with sensor 8 zeroing.
On six 3 curved built-up jigs 26, carried out three groups (totally 6 samples, the load of wherein per two samples is identical) test simultaneously, the different loads that is obtained, same temperature (600 ℃) three groups of average creeping displacement curves of P91 material down are shown in figure 11.Can find out that from this figure the creep process of micro-test sample is divided into tangible two stages, the subordinate phase that phase one that creep rate reduces gradually and creep rate are constant meets the deformation of creep rule of P91 material.Steady state creep rate of deformation among Figure 11
is seen Figure 12 with the relation of load p; Under log-log coordinate system; Both have good linear relationship; Meet
(wherein N, n represent the creep constant relevant with temperature, creep loading index respectively) rule, with the association of traditional uniaxial static creep test experimental basis is provided for studying this method.
The creep test of 6 samples is carried out in this test simultaneously, can guarantee to be in work under the identical environment with batch to be tested, reduces the dispersiveness of creep experimental data, shortens the creep test time relatively; The employing counterweight loads, and has avoided the load fluctuation in the process of the test, has simplified the power down process process in the creep test simultaneously; Adopt displacement transducer to write down the deformation data of sample continuously, automatically, the test figure precision is provided, has reduced workload.
Embodiment 2: the little jumper bar under uniform temp, the different loads, 3 curved micro-test sample creep tests
(little jumper bar micro-test sample is of a size of Φ 10 * 0.5mm with micro-test sample 30; 3 curved micro-test samples are of a size of 20 * 5 * 1.5mm) and pack in the chassis 17; Guiding patrix 25 is installed, and is fixed, treat that 2 micro-test samples all pack into behind the built-up jig 26 with lock-screw 24; With two column set nuts 18 built-up jig 26 is connected on the column 21, thermopair 2 is installed then.The weight of weighing pressure head 15, depression bar 14 and weight tray 11 is with this weight preloading as creep test.Pressure head 15 is installed, depression bar 14 is screwed in weight tray 11 bottoms, pass orienting sleeve 12 from top to bottom.After depression bar and the pressure head of treating 2 samples all installed, fine rotation column 21 made the pressure head of 2 samples contact and be adjusted to depression bar and is positioned on the same axis direction, but do not apply counterweight load this moment.Displacement transducer 8 is installed on the sensor clamp 7, and adjustment sensor clamp 7 is pressed on it and measures on the plate 10 in the position of measuring on the support bar 6.Close electric furnace 4, intensification, insulation a period of time apply counterweight load 9 after treating temperature stabilization step by step, reposefully, notice that the load of sample is the weight and counterweight load 9 sums of pressure head 15, depression bar 14, weight tray 11.After load applies and finishes, on the displacement acquisition interface of industrial computer,, and the shift value of each sample of opening entry, show displacement curve with sensor 8 zeroing.
In same stove, carried out 3 curved and little jumper bar micro-test sample creep tests simultaneously, test findings is shown in figure 13.The creep test curve of little jumper bar micro-test sample has tangible three stages, deceleration creep, steady state creep, tertiary creep; 3 curved micro-test sample creeping displacement curves have tangible two stages, deceleration creep, steady state creep.
Can once realize the creep test of two kinds of same temperature of dissimilar samples, different loads, and trial curve meets the deformation of creep rule of material.Adopt this device, can shorten the creep test test, and can guarantee the comparability of the creep data that different micro-test sample methods are obtained.
Claims (3)
1. a bull microspecimen creep test device is characterized in that described device comprises outside support, loading system, measuring system, mounting and clamping system and heating and temperature control system; Described outside support comprises a base (23), is connected four pillars (3) on the base (23), and upper cover plate (5) is supported by four pillars (3); Described heating and temperature control system comprise a heating furnace (4) that has temperature controller (1), are fixed on through grate (22) on the base (23) of outside support, and thermopair (2) is fixed on little style (30) of being tested; Described loading system comprises; Be installed on the orienting sleeve (12) on the upper cover plate (5) of outside support; By orienting sleeve set nut (13) tightening, at least two depression bars (14), the upper end of depression bar (14) is passed orienting sleeve (12) and is threaded with weight tray (11); Orienting sleeve (12) cooperates with weight tray (11), and the lower end of depression bar (14) is stretched in the high temperature furnace (4) and contacted with pressure head (15); Described measuring system comprises two support bars (6) that are fixed on the upper cover plate (5); By sensor clamp (7) displacement transducer (8) clamping is being measured on the support bar (6); Measurement plate (10) is installed in weight tray (11) and goes up and move up and down with weight tray (11); The probe of displacement transducer (8) vertically is contacted with on the measurement plate (10) on the weight tray (11), on the data collecting card of displacement transducer (8) through cable and industrial computer (38); Said mounting and clamping system comprises that a lower end is fixed on the pillar (21) on the base (23); The upper end of pillar (21) is stretched in the heating furnace (4) and is connected with built-up jig (26) through screw thread and flat key (20); Described built-up jig (26) comprises a chassis (17); At least one pair of anchor clamps is that symmetric points are uniformly set on the chassis (17) along circumference with the center of circle, and described anchor clamps comprise following three kinds of structures:
First anchor clamps (33a) comprise that a guiding patrix (25) is fixed on the chassis (17) by lock-screw (24); Have chassis groove (35) on the chassis (17); Comprise that also one compresses patrix (16) and is threaded with chassis (17); One end of micro-test sample (30) is fastened on the cell wall of chassis groove (35) by housing screw (27), and the other end of micro-test sample (30) is unsettled to be positioned in the chassis groove (35) pressure head (15) that passes guiding patrix (25) by a lower end and to hold out against, and the upper end of pressure head (15) holds out against depression bar (14); The lower end of pressure head (15) is a semi-cylindrical
Second anchor clamps (33b) comprise that a guiding patrix (25) is fixed on the chassis (17) by lock-screw (24); Have chassis groove (35) on the chassis (17); Guiding patrix (25) and the corresponding bottom surface portions of chassis groove (35) have one and the corresponding upper groove (36) of chassis groove (35), and micro-test sample (30) is supported by two support rollers (31) and places in the chassis groove (35); One or two pressure heads (15) are set; Its lower end is passed guiding patrix (25) and is held out against micro-test sample (30), and pressure head (15) upper end holds out against depression bar (14), and the lower end of pressure head (15) is a semi-cylindrical;
The 3rd anchor clamps (33c) comprise that a guiding patrix (25) is fixed on the chassis (17) by lock-screw (24), have chassis groove (35) on chassis (17), guiding patrix (25) and the corresponding bottom surface portions of chassis groove (35); Have a boss (37) that matches with chassis groove (35); Micro-test sample (30) is positioned in the chassis groove (35), and ceramic bead (39) places on the micro-test sample (30), and a pressure head (15) is set; Its lower end holds out against ceramic bead (39) in the middle of passing boss (37); Pressure head (15) upper end holds out against depression bar (14), and pressure head (15) is a hollow tube, and the internal diameter of pipe is not more than the diameter of ceramic bead (39).
2. bull microspecimen creep test device as claimed in claim 1 is characterized in that, the chassis groove (35) of described the 3rd anchor clamps (33c) connects chassis (17), and bottom perforation place of (17) is provided with a plug (41) and is threaded with chassis (17) on the chassis.
3. bull microspecimen creep test device as claimed in claim 1 is characterized in that, described first anchor clamps (33a), second anchor clamps (33b), the 3rd anchor clamps (33c) can respectively or be combined into being installed on the chassis (17).
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| CN2011205737406U CN202533335U (en) | 2011-12-30 | 2011-12-30 | Multi-head creep testing device for miniature samples |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011205737406U CN202533335U (en) | 2011-12-30 | 2011-12-30 | Multi-head creep testing device for miniature samples |
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