CN104897465A - Equipment for measuring tensile deformation recovery capacity of epoxy resin joist - Google Patents
Equipment for measuring tensile deformation recovery capacity of epoxy resin joist Download PDFInfo
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- CN104897465A CN104897465A CN201510316791.3A CN201510316791A CN104897465A CN 104897465 A CN104897465 A CN 104897465A CN 201510316791 A CN201510316791 A CN 201510316791A CN 104897465 A CN104897465 A CN 104897465A
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Abstract
The invention relates to equipment for measuring the tensile deformation recovery capacity of an epoxy resin joist. The equipment comprises a stepping motor loading device, a water-bath circulating temperature control system and a camera shooting device, wherein the water-bath circulating temperature control system comprises a water-bath circulating box body with an upward opening; a baffle is arranged in the middle of the water-bath circulating box body; a plurality of mounting holes are formed in the baffle; a temperature controller is arranged in the water-bath circulating box body and used for regulating the water temperature in the water-bath circulating box body; the stepping motor loading device comprises an E-shaped mounting bracket, sliding bars, a fixing end fixture, a movable end fixture, a lead screw and a motor; the camera shooting device comprises a camera fixed at the top of the water-bath circulating box body and used for observing the epoxy resin joist, and a video capture card for collecting the data from the camera. According to the equipment for measuring the tensile deformation recovery capacity of the epoxy resin joist, the full process of the tensile deformation recovery of the epoxy resin joist can be simply and efficiently measured, and through the data obtained through measurement by the equipment, the tensile deformation curve and the tensile deformation-recovery curve, which change along with time, of the tensile deformation of the epoxy resin joist can be obtained.
Description
Technical field:
The invention belongs to casting resin performance test technical field, be specifically related to a kind of equipment measuring epoxy resin girder tensile deformation restorability.
Background technology:
The method measuring casting resin tensile deformation restorability is not provided in China " casting resin method for testing performance GB/T 2567-2008 ".The method that existing some measure epoxy resin girder tensile deformation restorability comprises: adopt special method to fix its stress and strain after epoxy resin girder is stretched to certain length, standing finally by allowing it to remember activationary temperature, observing its deformation rejuvenation; Under certain temperature conditions sample being stretched to certain distance by a certain gauge length, this distortion of quick freezing 1min, under placing it in specific temperature conditions, through measuring the length between a certain moment gauge length after a period of time, calculating tensile deformation recovery rate with this.But, said determination method or can only the tensile deformation restorability of characterizing epoxy resin girder qualitatively, or the tensile deformation recovery rate of a certain moment epoxy resin girder can only be characterized quantitatively, can not the continuous overall process recovered of characterizing epoxy resin girder tensile deformation quantitatively.
In view of the defect that existing mensuration epoxy resin girder deformation stretch recovery can exist, need a kind of equipment measuring epoxy resin girder tensile deformation restorability of research and development badly.
Summary of the invention:
The object of the invention is to for the deficiencies in the prior art, a kind of equipment measuring epoxy resin girder tensile deformation restorability is provided.
For achieving the above object, the present invention adopts following technical scheme to be achieved:
Measure an equipment for epoxy resin girder tensile deformation restorability, comprise stepping motor charger, water-bath loop temperature-control system and camera head; Wherein,
Water-bath loop temperature-control system opening direction water-bath circulation casing upward, the middle part of water-bath circulation casing is provided with baffle plate, and this baffle plate offers some mounting holes, is also provided with the temperature controller for regulating water temperature in water-bath circulation casing in water-bath circulation casing;
Stepping motor charger comprises E type mounting bracket, E type mounting bracket is arranged on baffle plate by the mounting hole on baffle plate, E type mounting bracket comprises the motor stage in three the first vertical plates be arranged in parallel, the second vertical plate, the 3rd vertical plate and horizontal direction, three vertical plates are cascaded by the sliding thick stick that two horizontal directions be arranged in parallel, and the first vertical plate and the 3rd vertical plate are fixed on the two ends of motor stage, the second vertical plate can move on motor stage along sliding thick stick; First vertical plate is provided with stiff end fixture, the second vertical plate is provided with movable end fixture, during stretching, the two ends of epoxy resin girder are separately fixed on stiff end fixture and movable end fixture; Stepping motor charger also comprises successively through the leading screw of three vertical plates, and leading screw is flexibly connected with between the first vertical plate and the 3rd vertical plate, is threaded with between the second vertical plate, and one end of leading screw is provided with the motor for driving it to rotate;
Camera head comprises and is fixed on water-bath circulation casing top for observing the camera of epoxy resin girder, and for collecting the video frequency collection card of camera data.
The present invention further improves and is: be also provided with the electric water pump being provided for water circulation in water-bath circulation casing in water-bath circulation casing.
The present invention further improves and is: the water inlet of electric water pump and water delivering orifice lay respectively at two diagonal angles place of water-bath circulation casing.
The present invention further improves and is: stepping motor charger also comprises the driver for controlling machine operation, and for providing the power-supply controller of electric of electric energy for motor and driver.
The present invention further improves and is: stepping motor charger also comprises and being arranged on motor stage for measuring the steel ruler of the little beam length of epoxy resin.
The present invention further improves and is: the initial end of steel ruler is alignd with stiff end fixture.
The present invention further improves and is: camera is fixed on the top of water-bath circulation casing by tripod.
The present invention further improves and is: camera head also comprises the power supply for providing electric energy for camera.
The present invention further improves and is: camera head also comprises computing machine, and the output terminal of video frequency collection card connects the input end of computing machine.
Relative to prior art, the present invention measures the equipment of epoxy resin girder tensile deformation restorability, this equipment can record the overall process that epoxy resin girder tensile deformation recovers simply and effectively, the data recorded by this equipment can obtain the time dependent tensile deformation curve of tensile deformation of epoxy resin girder, tensile deformation-recovery curve, supply in existing specification the defect lacking and measure epoxy resin girder tensile deformation restorability, compensate for the deficiency of existing survey and valuation epoxy resin girder tensile deformation restorability.
Accompanying drawing illustrates:
Fig. 1 is a kind of stereographic map measuring the equipment of epoxy resin girder tensile deformation restorability of the present invention.
Fig. 2 is a kind of vertical view measuring the equipment of epoxy resin girder tensile deformation restorability of the present invention.
Fig. 3 is epoxy resin deformation stress strain curve figure at 39 DEG C.
Fig. 4 is epoxy resin deformation stretching recovery curve figure at 39 DEG C.
Fig. 5 is epoxy resin deformation stress strain curve figure at 44 DEG C.
Fig. 6 is epoxy resin deformation stretching recovery curve figure at 44 DEG C.
In figure: 1-stepping motor charger, 1-1-motor, 1-2-driver, 1-3-power-supply controller of electric, 1-4-leading screw, 1-5-cunning thick stick, 1-6-movable end fixture, 1-7-stiff end fixture, 1-8-steel ruler, 1-9-motor stage, 2-water-bath loop temperature-control system, 2-1-water-bath circulation casing, 2-2-baffle plate, 2-3-electric water pump, 2-4-temperature controller, 3-camera head, 3-1-camera, 3-2-power supply, 3-3-video frequency collection card, 3-4-computing machine.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, a kind of equipment measuring epoxy resin girder tensile deformation restorability of the present invention, comprises stepping motor charger 1, water-bath loop temperature-control system 2 and camera head 3.
Wherein, water-bath loop temperature-control system 2 opening direction water-bath circulation casing 2-1 upward, the middle part of water-bath circulation casing 2-1 is provided with baffle plate 2-2, this baffle plate 2-2 offering some mounting holes, in water-bath circulation casing 2-1, being also provided with the temperature controller 2-4 for regulating water temperature in water-bath circulation casing 2-1;
Stepping motor charger 1 comprises E type mounting bracket, E type mounting bracket is arranged on baffle plate 2-2 by the mounting hole on baffle plate 2-2, E type mounting bracket comprises the motor stage 1-9 in three the first vertical plates be arranged in parallel, the second vertical plate, the 3rd vertical plate and horizontal direction, three vertical plates are cascaded by the sliding thick stick 1-5 that two horizontal directions be arranged in parallel, and the first vertical plate and the 3rd vertical plate are fixed on the two ends of motor stage 1-9, the second vertical plate can move on motor stage 1-9 along sliding thick stick 1-5; First vertical plate is provided with stiff end fixture 1-7, the second vertical plate is provided with movable end fixture 1-6, during stretching, the two ends of epoxy resin girder are separately fixed on stiff end fixture 1-7 and movable end fixture 1-6; Stepping motor charger 1 also comprises successively through the leading screw 1-4 of three vertical plates, and leading screw 1-4 is flexibly connected with between the first vertical plate and the 3rd vertical plate, be threaded with between the second vertical plate, one end of leading screw 1-4 is provided with the motor 1-1 for driving it to rotate;
Camera head 3 comprises and is fixed on water-bath circulation casing 2-1 top for observing the camera 3-1 of epoxy resin girder, and for collecting the video frequency collection card 3-3 of camera 3-1 data.
Further, in water-bath circulation casing 2-1, be also provided with the electric water pump 2-3 being provided for water circulation in water-bath circulation casing 2-1, and the water inlet of electric water pump 2-3 and water delivering orifice lay respectively at two diagonal angles place of water-bath circulation casing 2-1.
Further, stepping motor charger 1 also comprises the driver 1-2 worked for controlling motor 1-1, and for providing the power-supply controller of electric 1-3 of electric energy for motor 1-1 and driver 1-2.In addition, stepping motor charger 1 also comprises and being arranged on for measuring the steel ruler 1-8 of the little beam length of epoxy resin on motor stage 1-9, and the initial end of steel ruler 1-8 is alignd with stiff end fixture 1-7.
Further, camera 3-1 is fixed on the top of water-bath circulation casing 2-1 by tripod, and camera head 3 also comprises the power supply 3-2 for providing electric energy for camera 3-1.In addition, camera head 3 also comprises computing machine 3-4, and the output terminal of video frequency collection card 3-3 connects the input end of computing machine 3-4.
Motor 1-1 in above-mentioned stepping motor charger 1 is as most crucial part, one end is connected with driver 1-2, the other end is connected with leading screw 1-4, the test parameterss such as the loading speed that driver 1-2 controls motor by being connected with power-supply controller of electric 1-3, the other end of leading screw 1-4 connects with movable end fixture 1-6, between floating holder 1-6 and stiff end fixture 1-7 after installing ring epoxy resins girder sample, driver 1-2 drive motor 1-1, motor 1-1 drives leading screw 1-4, thus realizes the drawing process of sample.Steel ruler 1-8 is placed on motor stage 1-9, its initial end is alignd with stiff end fixture 1-7, test sample is marked with gauge length in 50mm place, middle part, after power-supply controller of electric 1-3 is connected with power supply, start driver 1-2, motor 1-1 drives leading screw 1-4 to rotate, thus tensile sample, by the situation of change of the scale reflection sample stretching on steel ruler 1-8 with its gauge length spacing in rejuvenation.Loading procedure in process of the test controls to be completed by stepping motor charger 1.
For water-bath loop temperature-control system 2, electric water pump 2-3 is placed at the bottom of the case of water-bath circulation casing 2-1, the water inlet of electric water pump 2-3 and water delivering orifice lay respectively at two diagonal angles place of water-bath circulation casing 2-1, it can make the water in water-bath circulating box keep flow state, thus make the water temperature of whole casing keep uniformity, the porose baffle plate 2-2 of band is put in the upper position of water-bath circulation casing 2-1, this baffle plate can as stilt, place the stepping motor 1 after repacking in the above, the upper left corner of water-bath circulation casing 2-1 is provided with temperature controller 2-4, it can be temperature required to test by the lower water temperature in casing, and keep the constant of temperature.There is the water-bath loop temperature-control system of temperature control and temperature incubation function, being placed in temperature-controlled box by installing the charger of sample, test can be reached by water-bath loop temperature-control system temperature required and guarantee the constant of test temperature in process of the test.
For camera head 3, camera 3-1 is arranged on the appropriate location of water-bath loop temperature-control system 2, the data line one end of being drawn by camera 3-1 is connected with power supply 3-2, the other end is connected with video frequency collection card 3-3, by video frequency collection card 3-3 is connected on computing machine 3-4, can clear, the stretching-rejuvenation of observing sample deformation in real time.The aftertreatment work of the data acquisition in process of the test and test figure is completed by video camera and the computing machine that is connected with video camera.Tensile deformation time dependent tensile deformation curve, tensile deformation-recovery curve at different tests temperature of epoxy resin girder can be drawn out by analyzing the data gathered.
In order to understand further the present invention, existing to being described in detail as follows.
1, shape memory recovers principle
Epoxy resin has remarkable recovery characters and mechanical property.The shape-memory properties of epoxy resin refers to and the epoxide resin material of figuration is heated to uniform temperature, and apply external force and make it be out of shape, cool in a deformed state, frozen strss, when being heated to uniform temperature again, epoxide resin material stress relief automatically restores to the ability of initial figuration state.The sign of shape-memory properties has very important theoretical and practical significance for the high performance shape-memory polymer of exploitation and compound substance thereof.Research shows, shape memory effect is finally determined by two aspect factors, and one is the structure of shape-memory material itself; Two is the external condition that shape memory occurs.Accordingly, the curve of characterizing epoxy resin girder tensile deformation restorability drawn out by this instructions according to equipment test result: the time dependent tensile deformation curve of epoxy resin stretching deformation, tensile deformation-recovery curve.
2, test parameters
Test parameters comprises: sample dimensions, test temperature, test rate, test displacement and test period etc.
1. sample dimensions
In order to the accuracy of warranty test result and the convenience of operation, epoxy resin girder adopts the specimen shape in " casting resin method for testing performance " (GB/T 2567-2008).
2. test temperature
In order to be better applied in bituminous pavement by epoxy resin girder, need to measure its deformation stretching at different temperatures and restorability.Adopt the glass transition temperature of the epoxy resin preparing epoxy resin girder to be 34 DEG C, test temperature with the glass transition temperature of this epoxy resin for benchmark, up and down with 5 DEG C for temperature interval float.Therefore, the test temperature drafted is 24 DEG C, 29 DEG C, 34 DEG C, 39 DEG C, 44 DEG C.Before starting test, first should by the thermostatic of water-bath loop temperature-control system to temperature required.
3. test rate
The speed of this measuring apparatus epoxy resin girder deformation stretch recovery energy adopts the rate of extension in " casting resin method for testing performance " (GB/T 2567-2008), is 10mm/min.
4. displacement is tested
When carrying out tension test, stretching displacement is as the criterion with the fracture of epoxy resin girder.
5. test period
After epoxy resin girder is broken, stepping motor after repacking stops loading, the rejuvenation of epoxy resin girder tensile deformation is observed by monitoring, because test temperature is different, test displacement is different, the time that sample recovers is different, thus test period scope by be stretched to sample and recover the stabilization sub stage.
3, test procedure
Before carrying out the test of epoxy resin girder tensile deformation restorability, should guarantee that instrument each several part can normally work, and get out preparing sample and shifting to an earlier date preheating vacuum drying chamber, water-bath circulating box of epoxy resin girder.
Test procedure is as follows:
1. by epoxy resin, JH230 toughner and hardening agent by certain proportioning preparation, then pour in beaker by the material prepared, beaker being put into temperature is that the vacuum drying chamber of 50 DEG C carries out deaeration process.
2. until when there is no bubble in beaker, take out beaker, epoxy resin is carefully poured in channel-shaped die trial, the temperature of vacuum drying chamber is adjusted to 80 DEG C.
3. by epoxy resin is housed die trial in vacuum drying chamber after the cured at ambient temperature 5h of 80 DEG C, take out die trial, take out the epoxy resin girder of dumbbell shaped.Because sample is dumbbell shaped, in order to keep the homogeneity of test findings, after standing a period of time, portion distance 50mm carries out gauge length in the sample.Guage section is stretched portion.
4. open temperature regulation switch and the cycling switch of water-bath loop temperature-control system, thermoregulator upper and lower limit temperature is all set to test temperature required.
5. between the platform graduated steel ruler of band being placed on the stepping motor after repacking and fixture, the epoxy resin girder having marked spacing is arranged on fixture, wherein, the position of fixture is the position of two graticules, guarantees to be clear that the scale between gauge length.Then the stepping motor after repacking is put into water-bath loop temperature-control case.
6. be fixed on by camera on the upside of water-bath loop temperature-control case, the general location of sample parts faces camera.By video frequency collection card, camera is connected on computer, open video collector, the charger with sample parts in water-bath loop temperature-control case can be clearly illustrated, according to the image adjustment camera position of video display, to measure the rejuvenation with record sample tensile deformation like clockwork.
7., after above-mentioned work is carried out, putting into water by installing the charger of sample, making water cover sample 1-2mm, and in water constant temperature certain hour, then open the stepping motor after repacking, stretch with the speed of 10mm/min.
8. sample moment of breaking, close stepping motor, by observation camera, return to after steady state (SS) until sample, termination test.
4, the innovative point of equipment and advantage
This testing equipment can record the tensile deformation restorability of epoxy resin girder simply and effectively.Compensate for the defect that shortage in existing specification evaluates epoxy resin girder tensile deformation restorability method, other researchers observe epoxide resin material restorability qualitatively.The maximum bright spot of this equipment is Continuous Observation to recover overall process with the tensile deformation of record epoxy resin girder, can obtain the time dependent tensile deformation curve of epoxy resin girder tensile deformation, tensile deformation-recovery curve under different temperatures, this does not have in the method measuring epoxy resin girder restorability at present.In addition, owing to have employed the water-bath circulating box of oneself research and development, can need to regulate test temperature according to test, and the effect of constant temperature can be played, stablizing of warranty test environment.The charger adopted can regulate test rate as required, simple to operation.
The advantage of this equipment mainly contains:
(1) adopt water-bath loop temperature-control system, required test temperature can be adjusted to according to test needs, and can constant temperature, guarantee that epoxy resin girder is tested under constant test temperature.This water-bath loop temperature-control system makes very simple, water bath is by can the rectangular box of retaining and temperature regulator form, in order to make the homogeneous temperature in water bath, water pump is put at the bottom of water bath, on the diagonal line that its water inlet and water delivering orifice are positioned at the bottom of case, play the effect of uniform temperature and circulator bath, then baffle plate with holes is placed on the middle part of water-bath circulating box, in the above charger is installed.
(2) data collector adopts planar pickup head unit, stretching-the rejuvenation of sample can be shown true, clear, in real time, according to the data of camera collection, epoxy resin girder time dependent tensile deformation curve, tensile deformation-recovery curve at different tests temperature can be drawn out.
(3) stepping motor is adopted to carry out load test.The stepping motor of this equipment is through repacking: the screw mandrel be positioned in the middle part of original stepping motor is moved on to side, and owing to sample will be put into water, and the motor part of motor can not be intake, and is therefore raised the position of motor.Stretching device adopts fixture pattern, can see the scale change of sample spacing like this clearly, be placed between stepping motor platform and fixture by graduated for band steel ruler, and the movable end of fixture adopt form of springs, simply controlled.Adopt the stepping motor after repacking to load, mechanics principle is simple, easy to operate controlled, is applicable to spread and uses, have a good application prospect.
(4) die trial processing and fabricating is quite simple, adopts the polytetrafluoroethylmaterial material with resistance to elevated temperatures to make die trial, low price, not only meets the high temperature resistant requirement vacuumized epoxy resin girder, and can reduce costs.Epoxy resin and polytetrafluoroethylmaterial material do not glue, and therefore, the demoulding is simple, can save the plenty of time.
5, correlation theory achievement
According to the measuring apparatus that this instructions is researched and developed, epoxy resin girder is respectively 39 DEG C in test temperature, the deformation stretching recovery curve under 44 DEG C of conditions.Its tensile deformation curve, tensile deformation-recovery curve are shown in Fig. 3 ~ Fig. 6.
Known from above test findings: two test temperatures, epoxy resin girder tensile deformation curve is in time straight line, and slope is consistent.This is because the position of charger fixture is just the position of two graticules, the sample rate of extension that camera head collects is the rate of extension of charger.3 groups of panel data degree of agreements under two test temperatures are very high, illustrate that test findings is reliable, stable.Stretching time under two test temperatures is all directly proportional to stretching distance.
For the breaking length of epoxy resin girder, 39 DEG C be 70 ± 1mm, 44 DEG C be 65 ± 1mm.This is because be the epoxy resin of 33 DEG C for glass transition temperature, too high temperature has a certain impact to its performance.
The rejuvenation of the tensile deformation of epoxy resin girder is: that recovers at the beginning is fast especially, the 1s starting to recover all recovers about 10mm, 1mm/s is recovered in ensuing 3s-4s, recover afterwards gradually to slow down, when especially getting back to 50mm by 51mm, it needs 75s-95s, but epoxy resin dumbbell shaped girder finally can get back to its initial gage.
Claims (9)
1. measure an equipment for epoxy resin girder tensile deformation restorability, it is characterized in that: comprise stepping motor charger (1), water-bath loop temperature-control system (2) and camera head (3); Wherein,
Water-bath loop temperature-control system (2) opening direction water-bath circulation casing (2-1) upward, the middle part of water-bath circulation casing (2-1) is provided with baffle plate (2-2), this baffle plate (2-2) offering some mounting holes, in water-bath circulation casing (2-1), being also provided with the temperature controller (2-4) for regulating water-bath circulation casing (2-1) interior water temperature;
Stepping motor charger (1) comprises E type mounting bracket, E type mounting bracket is arranged on baffle plate (2-2) by the mounting hole on baffle plate (2-2), E type mounting bracket comprises three the first vertical plates be arranged in parallel, second vertical plate, motor stage (1-9) in 3rd vertical plate and horizontal direction, three vertical plates are cascaded by the sliding thick stick (1-5) that two horizontal directions be arranged in parallel, and the first vertical plate and the 3rd vertical plate are fixed on the two ends of motor stage (1-9), second vertical plate can be upper mobile at motor stage (1-9) along sliding thick stick (1-5), first vertical plate is provided with stiff end fixture (1-7), second vertical plate is provided with movable end fixture (1-6), during stretching, the two ends of epoxy resin girder are separately fixed on stiff end fixture (1-7) and movable end fixture (1-6), stepping motor charger (1) also comprises successively through the leading screw (1-4) of three vertical plates, and leading screw (1-4) is flexibly connected with between the first vertical plate and the 3rd vertical plate, be threaded with between the second vertical plate, one end of leading screw (1-4) is provided with the motor (1-1) for driving it to rotate,
Camera head (3) comprises and is fixed on water-bath circulation casing (2-1) top for observing the camera (3-1) of epoxy resin girder, and for collecting the video frequency collection card (3-3) of camera (3-1) data.
2. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 1, is characterized in that: be also provided with the electric water pump (2-3) being provided for water-bath circulation casing (2-1) interior water circulation in water-bath circulation casing (2-1).
3. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 2, is characterized in that: the water inlet of electric water pump (2-3) and water delivering orifice lay respectively at two diagonal angles place of water-bath circulation casing (2-1).
4. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 1, it is characterized in that: stepping motor charger (1) also comprises the driver (1-2) worked for controlling motor (1-1), and for providing the power-supply controller of electric (1-3) of electric energy for motor (1-1) and driver (1-2).
5. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 1, is characterized in that: stepping motor charger (1) also comprises and being arranged on motor stage (1-9) for measuring the steel ruler (1-8) of the little beam length of epoxy resin.
6. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 5, is characterized in that: the initial end of steel ruler (1-8) is alignd with stiff end fixture (1-7).
7. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 1, is characterized in that: camera (3-1) is fixed on the top of water-bath circulation casing (2-1) by tripod.
8. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 1, is characterized in that: camera head (3) also comprises the power supply (3-2) for providing electric energy for camera (3-1).
9. a kind of equipment measuring epoxy resin girder tensile deformation restorability according to claim 1, it is characterized in that: camera head (3) also comprises computing machine (3-4), the output terminal of video frequency collection card (3-3) connects the input end of computing machine (3-4).
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| CN201510316791.3A CN104897465A (en) | 2015-06-10 | 2015-06-10 | Equipment for measuring tensile deformation recovery capacity of epoxy resin joist |
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| CN201510316791.3A CN104897465A (en) | 2015-06-10 | 2015-06-10 | Equipment for measuring tensile deformation recovery capacity of epoxy resin joist |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106124331A (en) * | 2016-06-08 | 2016-11-16 | 中国民航大学 | A kind of fatigue tester carrying out temperature cycles |
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