CN209727655U - A kind of high-efficiency high-accuracy creep test device - Google Patents
A kind of high-efficiency high-accuracy creep test device Download PDFInfo
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- CN209727655U CN209727655U CN201920318833.0U CN201920318833U CN209727655U CN 209727655 U CN209727655 U CN 209727655U CN 201920318833 U CN201920318833 U CN 201920318833U CN 209727655 U CN209727655 U CN 209727655U
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Abstract
The utility model provides a kind of high-efficiency high-accuracy creep test device, including rack, high-temperature cabinet, sample fixing device, strain gauge means and heating device, high-temperature cabinet is arranged on the rack, sample fixing device is arranged in high-temperature cabinet, sample fixing device is for clamping sample and provides the stress for making sample that tension and compression creep occur, heating device is used to heat sample or keep the temperature, and strain gauge means are used to carry out real-time measurement to the dependent variable of sample；Heating device includes power supply and thermocouple, and the thermoelectricity sensing element of thermocouple is sticked in specimen surface.The utility model measures the high temperature deformation of sample using contactless DIC digital image collection system, it avoids traditional indirect method of measurement and is easy to the low problem of measurement accuracy caused by being interfered by material coefficient of expansion difference and extraneous factor, measurement data is smoothly accurate, it is reproducible, in the utility model, using the pulse power as the power supply of heating device, efficiency is 5 times of conventional heating methods or so.
Description
Technical field
The utility model relates to metal material creep ageing behavioral value technology, especially a kind of high-efficiency high-accuracy creep examination
Experiment device can be used for stretching and compression stress relaxation ag(e)ing test.
Background technique
With the fast development of aerospace cause, have high structural integrity, intensity height and good seal performance etc. all
The large-scale integral panel component of more advantages is more and more in the weight of civilian big aircraft, military aircraft and new generation's carrier rocket
It wants to use in structure.Creep age forming be it is a kind of for manufacture high-precision, high-performance large-scale integrated member and grow up new
Based plate manufacturing process.The manufacture of large-scale component creep ageing high-quality is primary on condition that accurate by simple tension or compression test
Detect the creep ageing deformation and performance development rule of material.It stretches at present or compression test is generally in high-temerature creep testing machine
Upper progress.Creep testing machine includes the parts such as rack, load control system, strain measurement system and temperature control system.
Existing stretching or compression creep test operating process generally comprise following process: 1, sample is connected with fixture,
Device of extending is fixed on sample marking distance both ends convex ridge and connects grating displacement sensor, measures the strain of test process sample；2,
Technological parameter is set, specific temperature loading path is set on control computer；3, creep ageing is tested, and creep machine is kept for a long time
Constant temperature constant load makes sample creep age forming become second nature.
But above-mentioned existing stretching or compression creep test have the following disadvantages: 1, due to creep ageing characteristic basic test
It needs systematically to study the technological parameters such as different temperatures, stress and time to advise material creep deformation and the influence of mechanical property
Rule, it is necessary to carry out a large number of experiments, and existing creep testing machine is tested every time can only test a sample, therefore every time can only be right
The A single sample provides the test of a certain process conditions (process conditions may include the parameters such as temperature, stress, time), but to be
The creep age forming that system grasps material becomes second nature rule, then needs to carry out under the process conditions such as a large amount of different temperatures, stress, time
Experiment, therefore existing A single sample creep test efficiency is very low.And at present the rated load of creep machine usually 50~
It is between 100KN (thousand Ns) or bigger, and load maximum required for individual sample creep test does not generally exceed 8KN at present,
Only it is utilized a bit of before creep testing machine load stroke range, the load stroke of creep testing machine does not obtain abundant benefit
With, there are also it is biggish utilize space.2, existing creep machine mostly uses greatly displacement sensor sample high temperature deformation, sample
The factors such as clamping gap and external environment are also easy to that sensor reading is caused to change, and misdeem so as to cause system
Accidentally, test measurement precision is reduced, be embodied in: existing creep machine generally uses two sets of bars of extending to be separately fixed on sample
Lower both ends ridge, displacement sensor measures sample deformation by the relative deformation of two sets of bars of extending of measurement, wherein bar part of extending
In high-temperature cabinet, displacement sensor is then outside high-temperature cabinet, even if displacement sensor precision itself is higher, extend bar and sample
Due to material thermal expansion coefficient difference, obtained sample deformation result precision is not also high, and simultaneous displacement sensor has highly sensitive
It spends and exposes in the environment, it is easy to be interfered by site environment factor, influence to test accuracy or even the failure of an experiment.3, existing
Creep machine heating generally use the form of Resistant heating, it is longer that sample is warming up to the time required for target temperature, influences
Test progress and efficiency.
Chinese patent 201810011860.3 discloses a kind of high-throughput creep test device load loading system and compression
Creep equipment including driving assembly, is connected on driving assembly and for connecting the support platform and connection of multiple test samples
Hydraulic package above support platform and for abutting with test sample, driving assembly driving support platform move up and down, liquid
Pressing component includes closed hydraulic cylinder and multiple hydraulic pistons being connected in its hydraulic cylinder, and the diameter of each hydraulic piston is equal
Identical, and its hydraulic piston one end is connected in the hydraulic cylinder, the other end is for being connected to the top of the test sample.Though
Compression creep test can be carried out to multiple test samples simultaneously in the right program, but since its multiple sample is in same hydraulic cylinder
It is loaded under the multiple hydraulic pistons driven, and its multiple sample can only be tested under identical stress condition, only
The synchronism detection that can only realize multistation is only to change single test relative to the creep testing machine of A single sample
Quantity, this, which is actually unable in, is really achieved mutually indepedent between each sample, therefore, can make there is still a need for one kind in the prior art
It can reach independent between multiple samples mutually in stress, time, temperature, the scheme for not influencing each other or involving, Lai Tigao
The efficiency and effect of creep test.
Utility model content
The utility model aim is to provide a kind of high-efficiency high-accuracy creep test device, to solve to propose in background technique
The problem of.
A kind of high-efficiency high-accuracy creep test device, including rack, high-temperature cabinet, sample fixing device, strain gauge means,
Heating device, the high-temperature cabinet are arranged on the rack, and the sample fixing device is arranged in high-temperature cabinet, and sample fixing device is used
In clamping sample and the stress for making sample that tension and compression creep (tensile creep or compression creep) occur is provided, the heating device is used for
Sample is heated or is kept the temperature, the dependent variable that the strain gauge means are used to that sample to occur tension and compression creep carries out real-time measurement.
Further, the sample fixing device is more sample fixing devices, and more sample fixing devices include parallel
The supporting beam one and supporting beam two of setting, supporting beam one are equipped with multiple (multiple refer to is greater than or equal to 2) seal chambers, Mei Gemi
The corresponding sample of chamber is sealed, is provided with piston in seal chamber, a seal chamber is separated into two points of cavitys, the piston by piston
It is connected with strut and tie one, strut and tie one stretches out outside seal chamber the one end for being used to connect sample close to one end of supporting beam two, described
The position of each seal chamber is connected with a strut and tie two in the corresponding supporting beam one of supporting beam two, and strut and tie two is for connecting
The other end of sample is connect, a seal chamber passes through piping connection to hydraulic pressure system via two points of cavitys that piston is separated respectively
Two actuator ports of system, it is poor by adjusting the oil pressure in two points of cavitys, sample can be carried out to stretch or compression creep tries
It tests.
The number for the seal chamber (31) that the supporting beam one is equipped with is 4~12, preferably 5~8.
Preferably, each component cavity included by each seal chamber is connected in the working oil path of same hydraulic system.
Preferably, the corresponding one end far from sample of the seal chamber is provided with opening, and opening is sealed by sealing plug
It closes, while guaranteeing the sealing of seal chamber, convenient for the installation of piston and strut and tie one.
Further, one end that the strut and tie one is used to connect sample is connected with insulation connection ring one, and strut and tie two is used
Insulation connection ring two is connected in one end of connection sample.
One end of insulation connection ring one is connect with strut and tie one, and the other end of insulation connection ring one is connected with for directly connecting
Connect the sample fixed link one of sample one end, one end of insulation connection ring two is connect with strut and tie two, the connection ring two that insulate it is another
End is connected with the sample fixed link two for being directly connected to the sample other end.
The sample fixed link one and sample fixed link two are electric conductor, between sample fixed link one and strut and tie one with
And clearance for insulation is maintained between sample fixed link two and strut and tie two, sample fixed link one and sample fixed link two are electric respectively
Property is connected to the power supply positive and negative polarities of heating device.
Further, one end that the strut and tie two connects supporting beam two is arranged to T-shaped structure, is provided in supporting beam two
With the matched T-shaped hole of strut and tie T-shaped structure, the T-shaped hole both ends are open, and strut and tie two is used to connect one end of sample from T
The place open at one end in shape hole is stretched out, and the other end opening of T-shaped hole is provided with nut, and cap end protrudes into T-shaped hole and tension and compression
Bar two offsets.
Further, more sample fixing devices further include tensile stress sensor and compression sensor, and the drawing is answered
The sensing element of force snesor is arranged between strut and tie two and the hole shoulder of T-shaped hole, the sensing element of the compression sensor
It is arranged between strut and tie two and nut.
Further, when sample bar samples externally threaded for end band, the sample fixed link one and sample
Fixed link two be used for connect sample position be provided with the matched threaded hole of sample end external screw thread, when the sample be end
When holding the plate tensile sample with mounting hole, the position that the sample fixed link one is used to connect sample with sample fixed link two is respectively provided with
There is the groove for the insertion of sample end, and the position of sample fixed link one and two respective slot of sample fixed link is provided with for installation
Sell across through-hole, mounting pin pass through the mounting hole of through-hole and sample end and realize sample one end and fixed link one connection and
The connection of the sample other end and fixed link two.
Preferably, the strain gauge means use DIC (Digital Image Correlation) digital image acquisition
System measures the strain of sample, strain gauge means include mounting rack, light source, DIC video camera and with DIC video camera
The computer of connection, the Sample Image which is used to acquire DIC video camera carries out on-line analysis, and generates sample
Strain as a result, the computer can be carried with creep testing machine itself PC control machine be integrated together, mounting rack is fixed on
In rack and be located at outside high-temperature cabinet, the DIC video camera and light source are arranged on mounting rack, the camera lens of DIC video camera and
For the direction of illumination of light source towards the sample in high-temperature cabinet, the side that the high-temperature cabinet corresponds to DIC video camera is set as transparent view
Window.
Preferably, the transparent window material uses transparency silica glass.
Preferably, the DIC number of cameras is two, is maintained between the optical center axis of two DIC video cameras
30 °~120 ° of angle, in order to acquire the strain pattern of sample from different directions, convenient for computer according to sample different location
Strain pattern combine generate sample three dimensional strain process.
Further, the heating device includes power supply, thermocouple and temperature controller, and the sample fixed link one and sample are solid
The connecting terminal for connecting positive pole or cathode is provided in fixed pole two, the thermoelectricity sensing element of the thermocouple is sticked
Real-time measurement is carried out in specimen surface and for the temperature to sample, power supply is electrically connected control by the temperature controller with thermocouple
System.
The sensing element of the thermocouple, which is preferably sticked, deviates from the one side of DIC camera lens in sample.
The power supply preferred pulse power supply of the heating device, pulse power frequency be 100~1000Hz, preferably 200~
500Hz。
The utility model provides a kind of more sample tension and compression creep test methods, uses above-mentioned high-efficiency high-accuracy creep test
Device is tested, comprising the following steps:
1) sample installation is connected between strut and tie one and strut and tie two, specifically, one end of sample is passed through insulation
Connection ring one and sample fixed link one are connect with strut and tie one, and the other end of sample is fixed by insulation connection ring two and sample
Bar two is connect with strut and tie two.
2) it connects and starts heating device, start to keep the temperature after making sample be warming up to target temperature.
3) start hydraulic system and strain gauge means, control two points of cavitys corresponding to each sample as needed
In oil pressure it is poor, sample stretch or compression creep test, while the dependent variable of strain gauge means real-time testing sample；Institute
State the oil pressure in two points of cavitys and the correspondence setting of oil liquid flow direction and tension and compression creep test are as follows: sample needs tension
When stress, the oil pressure divided in cavity close to sample is greater than the oil pressure divided in cavity far from sample, divides cavity close to sample
Oil inlet divides cavity oil return far from sample；When sample needs compression chord, it is less than close to the oil pressure of sample divided in cavity separate
The oil pressure of sample divided in cavity, divides cavity oil inlet far from sample, divides cavity oil return close to sample.
Preferably, the strain gauge means in the step 3 use DIC (Digital Image Correlation) figure
As acquisition system, before step 1 starts, upper speckle first is sprayed in specimen surface, in order to which DIC camera carries out Image Acquisition.
Preferably, the supporting beam one and supporting beam two are horizontal positioned direct rod shape, and the seal chamber in supporting beam one is in
Symmetrical expression distribution, when multiple samples that synchronization is carried out are not all the same by creep stress direction, supporting beam one and support
Sample stress between beam two is set as being distributed in tension and compression compartment, i.e. creep stress direction suffered by two sample of arbitrary neighborhood
On the contrary to make supporting beam one and supporting beam two keep balancing as far as possible.
The utility model at least has the advantages that
The utility model proposes a kind of high-efficiency high-accuracy creep test devices.By close to each sample setting one
Chamber is sealed, each seal chamber divides cavity including there are two, can be to its corresponding examination by the oil pressure difference changed in two points of cavitys
Sample provides tensile stress or compression stress, so that the suffered stress intensity of each part sample and stress time can under synchronization
Keep relatively independent, under synchronization, aliquot can be tension, and aliquot can be to be pressurized, in terms of the stress time, and part is tried
The sample stress time can be grown, and another part sample stress time can be short, can be achieved at the same time multiple samples under same creep machine
The experiment of different technology conditions is carried out, and is able to achieve the load of sample and the independent control of time, significantly improves creep examination
The efficiency and precision tested, and strong flexibility, the case where especially for needing to do single factor experiment or comparative test, this is practical new
The superiority of type is more prominent.
The utility model also introduces the heating device of tape pulse power supply, and the temperature of each sample is pulse current by power supply
Heating device individually controlled, the temperature of each sample is mutually independent of each other, but whole concentrates in high-temperature cabinet again.Utilize pulse
The joule heating effect and non-thermal effect of electric current, cooperation thermocouple feed back the temperature of sample, can be needed according to test to examination
Sample realizes quickly heating, heat preservation and cooling, and the pulse power is as a kind of moment high energy outfield, the high energy joule heating effect generated
Make to be heated to target temperature in the sample short time with electromigration, efficiency is 5~8 times of conventional heating methods；And electric arteries and veins
There is high aggregation characteristic can accurately realize a variety of examinations in high-temperature cabinet by reasonable Arrangement electric pulse heating system for punching energy field
Sample temperature coexists, and can be realized the independent accurate temperature controlling of each sample of different location in high-temperature cabinet, and the temperature of each sample it
Between again do not influence independently of each other.
The utility model measures the high temperature deformation of sample using contactless DIC digital image collection system,
Sample can be strained and carry out high-acruracy survey, avoided traditional indirect method of measurement and be easy to different and extraneous by the material coefficient of expansion
The low problem of measurement accuracy caused by factor is interfered, and due to DIC strain measurement system be it is untouchable, measurement data is more flat
It is sliding accurate, it is reproducible (i.e. the obtained data consistent degree of repetitive test measurement is high).
In order to preferably measure the strain of sample, two DIC video cameras are set in the utility model, binocular is formed to sample
Stereoscopic visual effect realizes the three-dimensional coordinate of specimen surface in deformation process, displacement by tracking the speckle image of body surface
It measures with the dynamic of strain, is measured relative to the existing single axle using displacement sensor, it is more precisely intuitive.
Constant by proof stress, the high-precision creep test device of the utility model can be used for stretching and compression pine
Relaxation ag(e)ing test.
Other than objects, features and advantages described above, there are also other purposes, feature and excellent for the utility model
Point.Below with reference to figure, the utility model is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide a further understanding of the present invention, the utility model
Illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.In attached drawing
In:
Fig. 1 is that the high-efficiency high-accuracy creep test device integral outer topology view of the preferred embodiment in the utility model is (high
Incubator internal element is not shown)；
The removal high-temperature cabinet and the high-efficiency high-accuracy creep after strain gauge means that Fig. 2 is the preferred embodiment in the utility model
Experimental rig main view；
Fig. 3 is more sample fixing device stereochemical structure views of the preferred embodiment in the utility model；
Fig. 4 is more sample fixing device stereochemical structure views with internal structure of the preferred embodiment in the utility model.
In figure: 1- rack, 11- column one, 12- column two, 2- high-temperature cabinet, 21- transparent window, 3- supporting beam one, 31- is close
Chamber is sealed, 310- divides cavity a, 311- to divide cavity b, 312- pipeline a, 313- pipeline b, 32- piston, 33- strut and tie one, 34- sealing
Plug screw, 35- insulation connection ring one, 36- sample fixed link one, 4- supporting beam two, 41- strut and tie two, 42- insulation connection ring two,
43- sample fixed link two, 44- nut, 45- stress induction element a, 46- stress induction element b, 5- sample, 6- clearance for insulation,
7- connecting terminal, 8- thermoelectricity sensing element, 91- mounting rack, 92- light source, 93-DIC video camera.
Specific embodiment
The embodiments of the present invention are described in detail below in conjunction with attached drawing, but the utility model can be according to power
Benefit requires to limit and the multitude of different ways of covering is implemented.
A kind of high-efficiency high-accuracy creep test device referring to figs. 1 to 4, including rack 1, high-temperature cabinet 2, more samples are fixed
Device, strain gauge means and heating device, the high-temperature cabinet are arranged on the rack, and more sample fixing devices and heating fill
It installs in high-temperature cabinet, more sample fixing devices are for clamping sample and providing makes sample that tension and compression creep (tensile creep occur
Or compression creep) stress, the heating device be used for sample heat or keep the temperature, the strain gauge means be used for sample
The dependent variable that tension and compression creep occurs carries out real-time measurement.
More sample fixing devices include the supporting beam 1 and supporting beam 24 of vertical bar shape disposed in parallel, supporting beam one
It is fixedly connected respectively with column 2 12 with rack by the column 1 through high temperature box body with supporting beam two, in supporting beam one
If each seal chamber corresponds to a sample 5 there are six equidistant symmetrical seal chamber 31, it is provided with piston 32 in seal chamber,
One seal chamber is separated into two points of cavitys (be respectively defined as point cavity a310 and divide cavity b311) by piston, and the piston connects
It is connected to strut and tie 1, strut and tie one stretches out outside seal chamber the one end for being used to connect sample 5 close to one end of supporting beam two, described
The position of each seal chamber is connected with a strut and tie 2 41 in the corresponding supporting beam one of supporting beam two, and strut and tie two is used for
Connect the other end of sample, a seal chamber dividing of being separated cavity a and divides cavity b to pass through pipeline a312 respectively via piston
Two actuator ports of hydraulic system are connected to pipeline b313.
(a component cavity refers to divides cavity a310 included by a seal chamber to each component cavity included by each seal chamber
With divide cavity b311) may be connected in the working oil path of same hydraulic system, two points of cavitys included by each seal chamber
Between pressure difference can adjust and control by one group of hydraulic control valve.
Referring to fig. 4, the corresponding one end far from sample 5 of the seal chamber 31 is provided with opening, and opening passes through sealing plug 34
It is closed, while guaranteeing the sealing of seal chamber, convenient for the installation of piston 32 and strut and tie 1.
Referring to fig. 4, one end that the strut and tie one is used to connect sample is connected with the insulation connection ring one of cylinder-like structure
35, one end that strut and tie two is used to connect sample is connected with the insulation connection ring 2 42 of cylinder-like structure.
The both ends of insulation connection ring one are equipped with internal screw thread, one end internal screw thread for the connection ring one that insulate and one end of strut and tie
External screw thread screw connection, the other end internal screw thread for the connection ring one that insulate and the external screw thread of one 36 end of sample fixed link screw company
It connects；The both ends of insulation connection ring 2 42 are equipped with internal screw thread, one end internal screw thread for the connection ring two that insulate and 2 41 end of strut and tie
External screw thread screw connection, the other end internal screw thread for the connection ring two that insulate and the external screw thread of 2 43 end of sample fixed link screw company
It connects.Referring to fig. 4, it is maintained between sample fixed link one and strut and tie one and between sample fixed link two and strut and tie two absolutely
Intermarginal gap 6 prevents electric current from flowing into equipment to be formed into a loop after flowing a current through sample fixed link and sample.
Sample fixed link one and sample fixed link two are electric conductor, in the sample fixed link one and sample fixed link two
It is provided with the connecting terminal 7 for connecting positive pole or cathode, sample fixed link one and sample fixed link two pass through wiring
The power supply positive and negative polarities of heating device (not shown) are electrically connected in terminal 7.
The heating device includes power supply, thermocouple and temperature controller, and the thermoelectricity sensing element 8 of the thermocouple, which is sticked, to be tried
Sample surface, sensing element, which is preferably sticked, deviates from the one side of DIC camera lens in sample, and is located at the centre in specimen length direction
Position, power supply are electrically connected control, the sample real time temperature that temperature controller is fed back according to thermocouple by the temperature controller with thermocouple
And start or close power supply, it in the not up to sample creep test temperature of setting, opens power supply and sample is heated, set when reaching
When fixed sample creep test temperature, sample can be kept the temperature with frequency by reducing the size of current of power supply, this implementation
In example, the fast pulse power of the power supply selection heating speed of heating device.
Referring to fig. 4, one end that the strut and tie two connects supporting beam two is arranged to T-shaped structure, is provided in supporting beam two
With the matched T-shaped hole of strut and tie T-shaped structure, the T-shaped hole both ends are open, and strut and tie two is used to connect one end of sample from T
The place open at one end in shape hole is stretched out, and the other end opening of T-shaped hole is provided with nut 44, and cap end is protruded into T-shaped hole and drawn
Compression bar 2 41 offsets.
In the present embodiment, more sample fixing devices further include tensile stress sensor and compression sensor, the tensile stress
The stress induction element a45 of sensor is arranged between strut and tie two and the hole shoulder of T-shaped hole, the stress of the compression sensor
Sensing element b46 is arranged between strut and tie two and nut, it is noted that tensile stress sensor described in the utility model
For being opposite sample with " drawing " and " pressure " in compression sensor, " drawings " and " pressure " respectively refer to sample tension stress and by
Compression.When carrying out compression creep test, i.e., sample compression chord when, compression sensor described in the utility model is answered
Power sensing element b46 is to be pressurized, and the stress induction element a45 of tensile stress sensor does not work；Carrying out tensile test
When, i.e., sample tension stress when, the stress induction element a45 of tensile stress sensor described in the utility model be pressurized, pressure
The stress induction element b46 of strain gauge does not work.
The stress induction element a45 of tensile stress sensor and the stress induction element b46 of compression sensor are respectively used to
Real-time measurement, and the stress value that sample is subject to are carried out to stress suffered by sample in sample tension stress and compression chord
The controlling terminal of hydraulic system is fed back to, in order to which controlling terminal is in time to dividing cavity a to adjust with the pressure difference of cavity b is divided
It is whole, form a closed-loop control system.
In the present embodiment, sample is the externally threaded bar samples of end band, the sample fixed link one and sample fixed link
Two are provided with and the matched threaded hole of sample end external screw thread for connecting the position of sample.
Referring to Fig. 1, the strain gauge means of the present embodiment are using DIC (Digital Image Correlation) number
Image capturing system measures the strain of sample, and strain gauge means include mounting rack 91, light source 92, DIC video camera 93
And the computer (not shown) connecting with DIC video camera, mounting rack are fixed on the rack and are located at outside high-temperature cabinet, institute
It states DIC video camera and light source is arranged on mounting rack, the camera lens of DIC video camera and the direction of illumination of light source are towards quasi- high temperature
Sample in case, the side that the high-temperature cabinet corresponds to DIC video camera are set as transparent window 21, and transparent window material is using transparent
Quartz glass.
In the present embodiment, DIC number of cameras is two, is maintained between the optical center axis of two DIC video cameras
45 ° of angle, in order to acquire the strain pattern of sample from different directions, convenient for computer according to the strain of sample different location
Image combines the three dimensional strain process for generating sample.
A kind of more sample tension and compression creep test methods, are tested using above-mentioned high-efficiency high-accuracy creep test device, packet
Include following steps:
1) sample installation is connected between strut and tie one and strut and tie two, specifically, one end of sample is passed through insulation
Connection ring one and sample fixed link one are connect with strut and tie one, and the other end of sample is fixed by insulation connection ring two and sample
Bar two is connect with strut and tie two.
2) it connects and starts heating device, start to keep the temperature after making sample be warming up to target temperature.
3) start hydraulic system and strain gauge means, control two points of cavitys corresponding to each sample as needed
In oil pressure it is poor, sample stretch or compression creep test, while the dependent variable of strain gauge means real-time measurement sample.
The correspondence setting of oil pressure and oil liquid flow direction and tension and compression creep test in described two points of cavitys are as follows: sample need by
When tensile stress, (oil pressure divided in cavity a) is greater than divides cavity (to divide in cavity b) to the cavity that divides of close sample far from sample
Oil pressure, divide cavity oil inlet close to sample, divide cavity oil return far from sample；When sample needs compression chord, close to sample
The oil pressure divided in cavity be less than the oil pressure divided in cavity far from sample, divide cavity oil inlet far from sample, close to sample
Divide cavity oil return.
In the present embodiment, the strain gauge means in the step 3 use DIC (Digital Image
Correlation) image capturing system before step 1 starts, first sprays upper speckle in specimen surface with matt white paint, so as to
Image Acquisition is carried out in DIC camera.
In the present embodiment, the supporting beam one is horizontal positioned direct rod shape with supporting beam two, the sealing in supporting beam one
Chamber is in symmetrical distribution, when multiple samples that synchronization is carried out are not all the same by creep stress direction, supporting beam one with
Sample stress between supporting beam two is set as being distributed in tension and compression compartment as far as possible, i.e. creep suffered by two sample of arbitrary neighborhood
Stress direction on the contrary, to make supporting beam one and supporting beam two keep stress balance as far as possible.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of high-efficiency high-accuracy creep test device, which is characterized in that including rack (1), high-temperature cabinet (2), the fixed dress of sample
Set, strain gauge means and heating device, the high-temperature cabinet are arranged on the rack, the sample fixing device is arranged in high-temperature cabinet
It is interior, sample fixing device for clamping sample and provide make sample occur tension and compression creep stress, the heating device for pair
Sample heating or heat preservation, the dependent variable that the strain gauge means are used to that sample to occur tension and compression creep carry out real-time measurement；
The heating device includes power supply and thermocouple, and the thermoelectricity sensing element (8) of the thermocouple is sticked in specimen surface, and
Thermoelectricity sensing element is sticked in the middle position in specimen length direction, and the power supply of the heating device selects the pulse power.
2. a kind of high-efficiency high-accuracy creep test device according to claim 1, which is characterized in that the fixed dress of the sample
It is set to more sample fixing devices, more sample fixing devices include supporting beam one (3) disposed in parallel and supporting beam two (4),
Supporting beam one is equipped with multiple seal chambers (31), the corresponding sample (5) of each seal chamber, is provided with piston in seal chamber
(32), a seal chamber is separated into two points of cavitys by piston, and the piston is connected with strut and tie one (33), and strut and tie one is close
The one end for being used to connect sample outside seal chamber is stretched out in one end of supporting beam two, and the supporting beam two corresponds to each in supporting beam one
The position of seal chamber is connected with a strut and tie two (41), and strut and tie two is used to connect the other end of sample, a sealing
Chamber is divided to cavity to pass through piping connection respectively to two actuator ports of hydraulic system via two that piston is separated, passes through tune
Oil pressure in whole two points of cavitys is poor, change strut and tie one mobile trend or direction and to sample carry out stretch or compression creep
Test；The frequency of the pulse power is 100~1000Hz.
3. a kind of high-efficiency high-accuracy creep test device according to claim 1 or 2, which is characterized in that the strain is surveyed
Amount device measures the strain of sample using DIC digital image collection system, strain gauge means include mounting rack (91),
Light source (92), computer DIC video camera (93) and connect with DIC video camera, mounting rack is fixed on the rack and is located at height
Outside incubator, the DIC video camera and light source are arranged on mounting rack, the camera lens of DIC video camera and the direction of illumination of light source
Towards the sample in quasi- high-temperature cabinet, the side that the high-temperature cabinet corresponds to DIC video camera is set as transparent window (21).
4. a kind of high-efficiency high-accuracy creep test device according to claim 3, which is characterized in that thermoelectricity sensing element patch
It is located at the one side that sample deviates from DIC camera lens.
5. a kind of high-efficiency high-accuracy creep test device according to claim 3, which is characterized in that transparent window material is adopted
Use transparency silica glass.
6. a kind of high-efficiency high-accuracy creep test device according to claim 3, which is characterized in that the DIC video camera
Quantity is two, and 30 °~120 ° of angle is maintained between the optical center axis of two DIC video cameras.
7. a kind of high-efficiency high-accuracy creep test device according to claim 2, which is characterized in that each seal chamber is wrapped
The each component cavity included is connected in the working oil path of same hydraulic system, two points of cavitys included by each seal chamber it
Between pressure difference adjust and control by one group of hydraulic control valve.
8. a kind of high-efficiency high-accuracy creep test device according to claim 2, which is characterized in that the seal chamber (31)
Corresponding one end far from sample is provided with opening, and opening is closed by sealing plug (34)；
One end that the strut and tie one is used to connect sample is connected with insulation connection ring one (35), and strut and tie two is for connecting sample
One end be connected with insulation connection ring two (42)；
It is described insulation connection ring one one end connect with strut and tie one, insulation connection ring one the other end be used for be directly connected to try
The sample fixed link one (36) of sample one end connects；One end internal screw thread of the insulation connection ring two is connect with strut and tie two, is insulated
The other end of connection ring two is connect with the sample fixed link two (43) for being directly connected to the sample other end；
Clearance for insulation is maintained between sample fixed link one and strut and tie one and between sample fixed link two and strut and tie two
(6)；Sample fixed link one and sample fixed link two are electric conductor, are all provided in the sample fixed link one and sample fixed link two
It is equipped with the connecting terminal (7) for connecting positive pole or cathode, sample fixed link one and sample fixed link two pass through terminals
The power supply positive and negative polarities of heating device are electrically connected in son.
9. a kind of high-efficiency high-accuracy creep test device according to claim 2, which is characterized in that the strut and tie two connects
The one end for connecing supporting beam two is arranged to T-shaped structure, be provided in supporting beam two with the matched T-shaped hole of strut and tie T-shaped structure, it is described
T-shaped hole both ends are open, strut and tie two be used to connect one end of sample from T-shaped hole it is open at one end from stretch out, T-shaped hole it is another
It is provided at end opening nut (44), cap end is protruded into T-shaped hole and offseted with strut and tie two (41).
10. a kind of high-efficiency high-accuracy creep test device according to claim 9, which is characterized in that the fixed dress of more samples
Setting further includes tensile stress sensor and compression sensor, and stress induction element a (45) setting of the tensile stress sensor exists
Between strut and tie two and the hole shoulder of T-shaped hole, the stress induction element b (46) of compression sensor setting strut and tie two with
Between nut.
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| CN201920318833.0U CN209727655U (en) | 2019-03-12 | 2019-03-12 | A kind of high-efficiency high-accuracy creep test device |
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| CN201920318833.0U CN209727655U (en) | 2019-03-12 | 2019-03-12 | A kind of high-efficiency high-accuracy creep test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738305A (en) * | 2019-03-12 | 2019-05-10 | 中南大学 | A kind of high-efficiency high-accuracy creep test device |
| CN114941996A (en) * | 2022-07-26 | 2022-08-26 | 西北工业大学 | Fiber grating strain measurement system for round bar fatigue sample |
-
2019
- 2019-03-12 CN CN201920318833.0U patent/CN209727655U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738305A (en) * | 2019-03-12 | 2019-05-10 | 中南大学 | A kind of high-efficiency high-accuracy creep test device |
| CN114941996A (en) * | 2022-07-26 | 2022-08-26 | 西北工业大学 | Fiber grating strain measurement system for round bar fatigue sample |
| CN114941996B (en) * | 2022-07-26 | 2022-11-01 | 西北工业大学 | Fiber grating strain measurement system for round bar fatigue sample |
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