CN116929906A - Large-temperature gradient area adjustable mechanical test device based on laser heating - Google Patents

Large-temperature gradient area adjustable mechanical test device based on laser heating Download PDF

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Publication number
CN116929906A
CN116929906A CN202310727159.2A CN202310727159A CN116929906A CN 116929906 A CN116929906 A CN 116929906A CN 202310727159 A CN202310727159 A CN 202310727159A CN 116929906 A CN116929906 A CN 116929906A
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China
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atmosphere
atmosphere furnace
laser
temperature
test piece
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CN202310727159.2A
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Chinese (zh)
Inventor
晋小超
许琦鹏
侯成
杨晶晶
冯圣
范学领
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN202310727159.2A priority Critical patent/CN116929906A/en
Publication of CN116929906A publication Critical patent/CN116929906A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/48—Thermography; Techniques using wholly visual means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/20—Investigating the presence of flaws
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/18—Performing tests at high or low temperatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0066—Propagation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0071—Creep
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073—Fatigue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0228—Low temperature; Cooling means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/023—Pressure
    • G01N2203/0234—Low pressure; Vacuum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0236—Other environments
    • G01N2203/0238—Inert
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0244—Tests performed "in situ" or after "in situ" use
    • G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0694—Temperature

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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a large-temperature gradient area adjustable mechanical test device based on laser heating, which comprises a laser heater, a mechanical property test device, an atmosphere tank, an atmosphere furnace, an illumination light source, a camera, a thermal imager, an industrial microscope and the like; the atmosphere furnace is clamped and fixed in the mechanical property test device, one end of the atmosphere furnace is provided with a light path channel, the other end of the atmosphere furnace is provided with an atmosphere channel, and a test piece is placed in the atmosphere furnace during the test; the laser heater is arranged on the bracket and is flush with the light path channel, and the pipe orifice of the laser heater is close to the light path channel in the atmosphere furnace; the atmosphere tank uniformly sprays compressed gas to the back of the heated part of the test piece through the pressure stabilizing valve; the illumination source, the camera, the thermal imager and the industrial microscope are aligned to the heated part of the test piece through the observation window. The invention can realize the variable heating area, adjustable heating temperature and controllable temperature gradient, and simultaneously realize the performance test under different atmosphere environments and monitor various injuries in real time.

Description

Large-temperature gradient area adjustable mechanical test device based on laser heating
Technical Field
The invention belongs to the technical field of aerospace, and particularly relates to a large-temperature-gradient area adjustable mechanical test device based on laser heating.
Background
The hypersonic aircraft nose cone, the front edge of the wing, the turbine blade of the aeroengine, the combustion chamber and other hot end components are in an extremely high-temperature environment when in service, and the surface temperature of the hot end components needs to be reduced by an efficient cooling method so as to ensure that the hot end components are in service in a specific temperature range. However, due to the interaction of the cooling channels, irregular component structures and uneven temperature fields, after the high-temperature gas flows through the wall surface of the hot end component, the temperature distribution in the wall surface is uneven, the temperature difference between the inside and the outside of the wall surface is extremely large, and the hot end components such as a nose cone, a wing front edge, a turbine blade, a combustion chamber and the like face the test of extreme temperature gradient load. When bearing a load with a large temperature gradient, different parts of the hot end part will have inconsistent volume changes, so that deformation is inconsistent, and great thermal stress is generated. In addition, the hot end components are also subjected to mechanical loads, which can accelerate the creation of damage and breakage. Therefore, the development of mechanical property test research of high-temperature materials under the service environment and large temperature gradient can provide technical support for the examination of key hot end components of aerospace important equipment, and is beneficial to the improvement of the comprehensive performance of the aerospace important equipment.
The key to develop in-situ mechanical test under large temperature gradient is to select advanced heating technology, and the traditional heating technology mainly comprises electromagnetic induction heating, resistance heating, quartz lamp irradiation heating, gas heating and the like. The electromagnetic induction heating skin effect is obvious, the thermal inertia is large, and nonmetallic materials such as ceramics and the like cannot be effectively heated; the resistance heating has large thermal inertia, low temperature rising and falling speed and poor temperature control precision; the quartz lamp irradiation heating lamp tube has short service life, low upper temperature limit and dispersed heat; the gas heating temperature control precision is poor and the temperature distribution is uneven. In recent years, due to the advantages of concentrated energy, high upper temperature limit, high temperature rising rate and the like, the laser heating technology is used for thermal gradient assessment experiments related to the military by foreign research institutions such as the American aerospace agency (NASA), the university of California and the like. However, according to limited reports, the thermal gradient examination test device based on laser heating by the research institutions cannot simulate the environment and atmosphere under the real service condition, lacks an accurate damage monitoring system, has low integration level and has certain defects. Therefore, an advanced laser heating mode which is accurate in temperature control, adjustable in atmosphere, variable in heating area, high in integration level and accurate in damage monitoring is developed, and an air cooling device, a mechanical test system and a damage in-situ monitoring system are combined to examine comprehensive mechanical properties of high-temperature materials in a service environment and a large temperature gradient, so that the method has great significance in developing large national devices such as advanced hypersonic aircrafts in China and aeroengines with high thrust-weight ratio.
Disclosure of Invention
The invention aims to provide a large-temperature-gradient areA-Adjustable mechanical test device based on laser heating, which can realize variable heating area, adjustable heating temperature and controllable temperature gradient, can realize performance test under vacuum and different oxidizing/reducing atmosphere environments and can monitor crack expansion in real time to study crack expansion properties of materials in the service process.
The invention is realized by the following technical scheme:
the large-temperature gradient area adjustable mechanical test device based on laser heating comprises a bracket, a laser heater, a mechanical property test device, an atmosphere tank, a pressure stabilizing valve, an atmosphere furnace, an illumination light source, a camera, a thermal imager and an industrial microscope;
the atmosphere furnace is clamped and fixed in the mechanical property test device, one end of the atmosphere furnace is provided with a light path channel, the other end of the atmosphere furnace is provided with an atmosphere channel, and a test piece is arranged in the atmosphere furnace during test; the laser heater is arranged on the bracket and is flush with the light path channel, and the pipe orifice of the laser heater is close to the light path channel in the atmosphere furnace; the atmosphere tank is connected with an atmosphere channel in the atmosphere furnace through the pressure stabilizing valve, and the pressure stabilizing valve enables compressed gas in the atmosphere tank to be uniformly sprayed to the back of the heated part of the test piece; the illumination light source, the camera, the thermal imager and the industrial microscope are aligned to the heated part on the test piece through the quartz glass observation window on the side surface of the atmosphere furnace.
The invention is further improved in that the mechanical property test device comprises a clamping device, a cross beam, a guide rail, a connecting rod and a base;
the guide rail is fixed with the base, the cross beam is in sliding connection with the guide rail, the clamping device is fixed on the cross beam and the base, the atmosphere furnace is in sliding connection with the guide rail through the connecting rod, the atmosphere furnace slides up and down along the guide rail and can be locked at any position of the guide rail, the atmosphere furnace is arranged between the clamping devices, the test piece is clamped by the clamping devices, and the test piece penetrates through the upper opening and the lower opening of the atmosphere furnace.
The mechanical property test device is further improved in that the mechanical property test device is provided with a resistance damage monitoring system and comprises an inner resistance wire and an outer resistance wire, wherein the outer resistance wire is wound at the outermost end of a test piece, the inner resistance wire is wound at the inner end of the test piece, and the clamping device is meshed with the positions around which the outer resistance wire and the inner resistance wire are wound.
The invention is further improved in that the mechanical property test device is provided with an acoustic emission damage monitoring system, and the acoustic emission damage monitoring system comprises an acoustic emission sensor, wherein the acoustic emission sensor is attached to a test piece between the clamping device and the atmosphere furnace.
The invention is further improved in that a laser light path channel containing a lens is embedded in the atmosphere furnace in the mechanical property test device, and the lens is fixed at the tail end of the laser light path channel and can slide along with the laser light path channel so as to adjust the size of a laser spot.
The mechanical property test device is further improved in that the mechanical property test device is provided with a temperature measurement system, and specifically comprises a thermocouple and a thermal imager, wherein the temperature measurement end of the thermocouple is attached to a heated part and a cooling part of a test piece, and the thermal imager is opposite to the heated part through quartz glass.
The invention is further improved in that the outer layer of the atmosphere furnace is made of stainless steel, the inner layer is made of mullite, and the surface of the clamping device is sprayed with a zirconia ceramic coating.
A further development of the invention is that the holder can be moved horizontally with the laser heater.
The invention is further improved in that 8 air dispersing holes are respectively arranged on the upper surface and the lower surface of the atmosphere furnace and are used for atmosphere overflow.
The invention is further improved in that the mechanical property test device is provided with a non-contact strain monitoring system, which comprises a camera and an illumination light source and is used for carrying out strain monitoring on the interested part which is coated with the speckles.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. the large-temperature gradient area adjustable mechanical test device based on laser heating provided by the invention adopts an advanced laser heating device to replace traditional heating modes such as electromagnetic induction heating, resistance heating, quartz lamp irradiation heating and the like, can rapidly cool the other side of the test piece while rapidly heating a heated area on one side in a non-contact manner, can simulate controllable large temperature gradient, has wide applicable material range and strong practicability, has a short test period, and provides a reliable test platform for the large-temperature gradient mechanical property test;
2. according to the large-temperature-gradient area adjustable mechanical test device based on laser heating, the heating area and the temperature of a test piece can be changed by adjusting the distance between the lens and the test piece and the power of the laser heater so as to meet different test requirements;
3. according to the large-temperature-gradient area adjustable mechanical test device based on laser heating, the atmosphere environment in the test process can be changed by adjusting the duty ratio of various atmospheres in the atmosphere tank, so that the actual service environment of a test piece can be simulated as truly as possible, and the accuracy of test data is improved;
4. the large-temperature-gradient area adjustable mechanical test device based on laser heating is internally provided with the resistance damage monitoring system, the acoustic emission damage monitoring system, the strain monitoring system and the shape damage monitoring system, and can perform multi-functional, multi-angle and high-accuracy nondestructive damage monitoring by matching and combining various damage monitoring systems. In addition, the advantages of high laser energy density and local heating are utilized, a complex cooling system is not needed, and a sensitive sensor is not easy to damage due to high temperature.
Drawings
FIG. 1 is a schematic diagram of a large temperature gradient area adjustable mechanical test device based on laser heating.
FIG. 2 is a front view of the mechanical property test apparatus and atmosphere furnace of the present invention.
Fig. 3 is a cross-sectional view of the holding device and the atmosphere furnace of the present invention, wherein fig. 3 (b) is A-A cross-sectional view of fig. 3 (a).
Reference numerals illustrate:
1. a bracket; 2. a laser heater; 3. mechanical property test device; 4. an atmosphere tank; 5. a pressure stabilizing valve; 6. an atmosphere furnace; 7. a laser light path channel; 8. a lens; 9. a thermocouple; 10. an atmosphere channel; 11. a test piece; 12. an internal resistance wire; 13. a clamping device; 14. an external resistance wire; 15. an illumination light source; 16. a camera; 17. a thermal imager; 18. an acoustic emission sensor; 19. air dispersing holes; 20. quartz observation window; 21. a cross beam; 22. a guide rail; 23. a connecting rod; 24. a base; 25. industrial microscopes.
Detailed Description
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the large-temperature-gradient area adjustable mechanical test device based on laser heating provided by the invention comprises a bracket 1, a laser heater 2, a mechanical property test device 3, an atmosphere tank 4, a pressure stabilizing valve 5, an atmosphere furnace 6, an illumination light source 15, a camera 16 and a thermal imager 17. As shown in fig. 2, the mechanical property test device 3 is characterized in that a guide rail 22 is fixed with a base 24, a cross beam 21 is slidably connected with the guide rail 22, a clamping device 13 is fixed on the cross beam 21 and the base 24, an atmosphere furnace 6 is slidably connected with the guide rail 22 through a connecting rod 23, slides up and down along the guide rail 22 and can be locked at any position of the guide rail 22, the atmosphere furnace 6 is arranged between the clamping devices 13, and a test piece 11 is clamped by the clamping devices 13 and penetrates through upper and lower openings of the atmosphere furnace 6. The side face of the atmosphere furnace 6 is provided with a high-temperature resistant quartz glass observation window 20, and the laser light path channel 7 is connected with the quartz glass observation window 20 in a sliding way, can slide along the axial direction and can be fixed at any position. The laser heater 2 is arranged on the bracket 1 and is flush with the light path channel 7, the pipe orifice is close to the light path channel 7 in the atmosphere furnace 6, and the bracket 1 can carry the laser heater 2 to move horizontally. The atmosphere tank 4 is connected with an atmosphere channel 10 in the atmosphere furnace 6 through a pressure stabilizing valve 5, and the pressure stabilizing valve 5 enables the compressed gas in the atmosphere tank 4 to be uniformly sprayed to the back of the heated part of the test piece 11. The non-contact strain observation system is composed of an illumination light source 15 and a camera 16, wherein the illumination light source 15, the camera 16, the thermal imager 17 and the industrial microscope 25 are aligned to a heated part on the test piece 11 through a quartz glass observation window 20. The illumination source 15, the camera 16, the thermal imager 17 and the industrial microscope 25 are fixed on the bracket 1, wherein the camera 16 is provided with a filter to prevent stray light from interfering with imaging.
The laser heater 2 is CO 2 Gas laserThe laser has relatively high power and high energy conversion efficiency, and a water cooling system is arranged between the laser channel and the outer wall for cooling the interior of the laser heater 2.
As shown in fig. 3, the outer resistance wire 14 is wound around the outermost end of the test piece 11, the inner resistance wire 12 is wound around the inner end of the test piece 11, and the clamping device 13 is engaged with the portions around which the outer resistance wire 14 and the inner resistance wire 12 are wound. The acoustic emission sensor 18 is attached to the test piece 11 between the holding device 13 and the atmosphere furnace 6.
As shown in fig. 3, 8 air diffusing holes 19 are formed in each of the upper and lower surfaces of the atmosphere furnace 6 for atmosphere overflow.
As shown in fig. 3, the lens 8 is fixed to the laser path 7 and can slide along with the laser path 7 to adjust the laser spot size.
As shown in fig. 3, the temperature measuring end of the thermocouple 9 is attached to the heated portion of the test piece 11.
The outer layer of the atmosphere furnace 6 is made of stainless steel, the inner layer is made of mullite, and the surface of the clamping device is sprayed with a zirconia ceramic coating to prevent the atmosphere furnace 6 and the clamping device 13 from being corroded and oxidized in the high-temperature test process.
The invention relates to a large-temperature gradient in-situ mechanical property test device with a changeable heating area, which is implemented as follows:
the test device can be used for carrying out the stretching, fatigue and creep tests of the high-temperature material under a large temperature gradient. Before the test, the integrity of the test device was checked, and after the heated portion of the test piece 11 was sprayed with high temperature-resistant specks, the thermocouple 9 was attached to the heated portion of the test piece 11. After the test piece 11 is passed through the atmosphere furnace 6 by adjusting the positions of the holding device 13 and the atmosphere furnace 6, the outer resistance wire 14 and the inner resistance wire 12 are wound around the test piece 11, both ends of the test piece 11 are held by the holding device 13, and the acoustic emission sensor 18 is bonded to the test piece 11 between the atmosphere furnace 6 and the holding device 13. The height of the bracket 1 is adjusted, the laser heater 2 is aligned to the laser light path channel 7, the heights and angles of the illumination light source 15, the camera 16, the thermal imager 17 and the industrial microscope 25 are adjusted, the heated part on the test piece 11 is aligned, the atmosphere furnace 6 is connected with the atmosphere tank 4 through the pressure stabilizing valve 5, the atmosphere tank 4 is filled with the prefabricated atmosphere, the water cooling system in the laser heater 2 is turned on, and the power supply is turned on.
In the test process, the pressure stabilizing valve 5 is opened firstly, so that the atmosphere furnace 6 is filled with the prefabricated atmosphere in the atmosphere tank 4 until the atmosphere overflows from the upper opening and the lower opening of the atmosphere furnace 6, then the power of the laser heater 2 is adjusted to the minimum, and the light path channel 7 is moved, so that the heated part is filled with the heating light spots. The power of the laser heater 2 and the pressure stabilizing valve 5 are regulated so that the temperatures measured by the thermocouple 9 and the thermal imager 17 reach rated temperatures and the temperature distribution is uniform. The mechanical property test device 3 was opened and a tensile/fatigue/creep test was performed. During the test, the data monitored by the inner resistance wire 12, the outer resistance wire 14 and the acoustic emission sensor 12, and the images obtained by the thermal imager 17 and the camera 16 are collected and stored.
After the test is finished, the pressure stabilizing valve 5 and the laser heater 2 are closed, when the temperature in the atmosphere furnace 6 is reduced to room temperature, the atmosphere furnace 6 is opened, the test piece 11 is taken out, the inner resistance wire 12, the outer resistance wire 14 and the acoustic emission sensor 12 are removed, and the obtained data and images are processed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. The large-temperature-gradient area adjustable mechanical testing device based on laser heating is characterized by comprising a bracket, a laser heater, a mechanical property testing device, an atmosphere tank, a pressure stabilizing valve, an atmosphere furnace, an illumination light source, a camera, a thermal imager and an industrial microscope;
the atmosphere furnace is clamped and fixed in the mechanical property test device, one end of the atmosphere furnace is provided with a light path channel, the other end of the atmosphere furnace is provided with an atmosphere channel, and a test piece is arranged in the atmosphere furnace during test; the laser heater is arranged on the bracket and is flush with the light path channel, and the pipe orifice of the laser heater is close to the light path channel in the atmosphere furnace; the atmosphere tank is connected with an atmosphere channel in the atmosphere furnace through the pressure stabilizing valve, and the pressure stabilizing valve enables compressed gas in the atmosphere tank to be uniformly sprayed to the back of the heated part of the test piece; the illumination light source, the camera, the thermal imager and the industrial microscope are aligned to the heated part on the test piece through the quartz glass observation window on the side surface of the atmosphere furnace.
2. The large-temperature-gradient area adjustable mechanical testing device based on laser heating according to claim 1, wherein the mechanical testing device comprises a clamping device, a cross beam, a guide rail, a connecting rod and a base;
the guide rail is fixed with the base, the cross beam is in sliding connection with the guide rail, the clamping device is fixed on the cross beam and the base, the atmosphere furnace is in sliding connection with the guide rail through the connecting rod, the atmosphere furnace slides up and down along the guide rail and can be locked at any position of the guide rail, the atmosphere furnace is arranged between the clamping devices, the test piece is clamped by the clamping devices, and the test piece penetrates through the upper opening and the lower opening of the atmosphere furnace.
3. The large-temperature-gradient area adjustable mechanical testing device based on laser heating according to claim 2, wherein the mechanical performance testing device is provided with a resistance damage monitoring system and comprises an inner resistance wire and an outer resistance wire, wherein the outer resistance wire is wound at the outermost end of a test piece, the inner resistance wire is wound at the inner end of the test piece, and the clamping device is meshed with a part wound with the outer resistance wire and the inner resistance wire.
4. The large-temperature-gradient area adjustable mechanical testing device based on laser heating according to claim 2, wherein the mechanical performance testing device is provided with an acoustic emission damage monitoring system, and the acoustic emission damage monitoring system comprises an acoustic emission sensor, and the acoustic emission sensor is attached to a test piece between the clamping device and the atmosphere furnace.
5. The large-temperature-gradient area adjustable mechanical testing device based on laser heating according to claim 2, wherein a laser light path channel comprising a lens is embedded in an atmosphere furnace in the mechanical property testing device, and the lens is fixed at the tail end of the laser light path channel and can slide along with the laser light path channel so as to adjust the laser spot size.
6. The large-temperature-gradient area adjustable mechanical testing device based on laser heating according to claim 2, wherein the mechanical performance testing device is provided with a temperature measuring system, and specifically comprises a thermocouple and a thermal imager, wherein the temperature measuring end of the thermocouple is attached to a heated part and a cooling part of a test piece, and the thermal imager is opposite to the heated part through quartz glass.
7. The large-temperature-gradient area adjustable mechanical test device based on laser heating according to claim, wherein the outer layer of the atmosphere furnace is made of stainless steel, the inner layer of the atmosphere furnace is made of mullite, and the surface of the clamping device is sprayed with a zirconia ceramic coating.
8. The large temperature gradient area adjustable mechanical test device based on laser heating according to claim 1, wherein the bracket is capable of carrying the laser heater for horizontal movement.
9. The large-temperature-gradient area adjustable mechanical test device based on laser heating according to claim 1, wherein 8 air dispersing holes are respectively formed in the upper surface and the lower surface of the atmosphere furnace and are used for atmosphere overflow.
10. The large-temperature-gradient area adjustable mechanical testing device based on laser heating according to claim 1, wherein the mechanical performance testing device is provided with a non-contact strain monitoring system, and comprises a camera and an illumination light source, and the non-contact strain monitoring system is used for strain monitoring of a region of interest covered with speckles.
CN202310727159.2A 2023-06-19 2023-06-19 Large-temperature gradient area adjustable mechanical test device based on laser heating Pending CN116929906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310727159.2A CN116929906A (en) 2023-06-19 2023-06-19 Large-temperature gradient area adjustable mechanical test device based on laser heating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310727159.2A CN116929906A (en) 2023-06-19 2023-06-19 Large-temperature gradient area adjustable mechanical test device based on laser heating

Publications (1)

Publication Number Publication Date
CN116929906A true CN116929906A (en) 2023-10-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116929906A (en)

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