CN104535412B - Ultraviolet illumination DIC (digital image correction)-based mechanical property loading measuring system and method for high-temperature material - Google Patents
Ultraviolet illumination DIC (digital image correction)-based mechanical property loading measuring system and method for high-temperature material Download PDFInfo
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- CN104535412B CN104535412B CN201410840914.9A CN201410840914A CN104535412B CN 104535412 B CN104535412 B CN 104535412B CN 201410840914 A CN201410840914 A CN 201410840914A CN 104535412 B CN104535412 B CN 104535412B
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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
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- 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
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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
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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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
- G01N3/08—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
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Abstract
The invention discloses an ultraviolet illumination DIC (digital image correction)-based mechanical property loading measuring system and method for a high-temperature material. The measuring system is characterized by comprising the following steps: projecting an ultraviolet light source on the surface of a to-be-measured sample which is in a set temperature environment and in a set loaded state; and collecting images of the surface of the to-be-measured sample by using an ultraviolet sensitive image collection module to acquire collection images on the surface of the to-be-measured sample, corresponding to different temperatures, moments and loading forces, and carrying out DIC image processing on the collected images to acquire full-field thermal deformation information of the surface of the to-be-measured sample. The system and the method disclosed by the invention can be used for effectively achieving the non-contacted measurement of full-field strain of the material with the temperature being over 1000 DEG C.
Description
Technical field
The present invention relates to a kind of mechanical performance of the whole field deformation under power for high temp objects surface, Thermal Load is surveyed
Amount system and its measuring method, are applied to strain and deformation under the hot conditionss of each field such as machine-building, Aero-Space, material
Measurement.
Background technology
The accurate measurement of high-temperature material mechanical mechanics property under the high temperature conditions, to aerospace flight vehicle material and knot
The reliability assessment of structure, biometry and safe design are most important, obtain the deformation under material surface high-temperature condition and answer
Variable field information is the key to its Study on Mechanical Properties and basis.In prior art, for high-temperature material under the high temperature conditions
There are the following problems for the measurement of mechanical mechanics property:
One be for more than 1000 DEG C high temperature also not be adapted full field deformation measure technology；
The contact deformation measurement method that two is traditional can only realize single-point or average deformation information it is impossible to obtain the whole audience
Information.In noncontact whole audience optical measurement method, laser speckle interferometry method (espi) is not only harsh to environmental requirement, and in material
Material because temperature high in cannot measure in the state of rubescent；
Three is that traditional method cannot realize high temperature furnace and stretching-machine cooperation carries out the loading of power while heating, simultaneously high
Measured by the temperature sensor of its own of warm stove is the temperature of furnace gas, due to existing between measured material and furnace gas
The temperature of the temperature that temperature contrast, therefore temperature sensor record not measured material；
Digital Image Correlation Method (digital image correlation, dic) is a kind of whole audience non-contact method,
It is widely used in the measurement in each field such as machine-building, Aero-Space, material；But, due to material when heating surface from
Luminous spectrum with the superposition of imaging illumination light source, when temperature is higher than 1000 DEG C, specimen surface burnt red reach approximately white
Color.Surface emitting spectrum has covered whole visible region (wavelength 390nm～780nm), and radiant intensity will be greater than illumination light
Source strength, causes the luminance saturation of gathered image, thus occurring serious moving back correlation effect.
It is illustrated in figure 2 material thermal spectrum under more than 1000 DEG C different temperatures it is seen that rising with temperature, its heat
Radiation spectrum has the trend (and radiation wavelength offsets) translating from right to left toward shortwave direction.At 1000 DEG C, radiation spectrum energy exists
500nm wave band is also fainter, but to 1400 DEG C, radiation spectrum all also has in purple light section (wavelength 380nm～400nm) to be sent out
Penetrate.Therefore under this high-temperature condition, common monochromatic illumination light source (as 450nm blue light) and filtering cannot be anti-from sample
Penetrate and in spectrum, detect useful information.
Content of the invention
The present invention is for avoiding the weak point existing for above-mentioned prior art, provide a kind of based on ultra violet illumination dic's
High-temperature material mechanical performance loading measurement system and measuring method, to being capable of the non-of more than 1000 DEG C material whole audience strains
Contact measurement.
The present invention is to solve technical problem to adopt the following technical scheme that
The high-temperature material mechanical performance based on ultra violet illumination dic for the present invention loads measuring method, is characterized in: for being in
Tested sample under the temperature environment setting the stress state being in setting, wavelength is less than the ultraviolet source projection of 380nm
Surface in described tested sample；Using ultraviolet sensitivity image capture module, the surface of described tested sample is carried out image and adopted
Collection, obtains each collection image corresponding to different temperatures, tested sample surface not in the same time, under different loading force, by right
Described each collection image carries out dic image procossing, obtains the whole audience thermal deformation information on tested sample surface.
The high-temperature material mechanical performance based on ultra violet illumination dic for the present invention loads measuring method, is characterized in: described temperature
Environment is 1000 DEG C～3000 DEG C.
The high-temperature material mechanical performance loading measurement system based on ultra violet illumination dic for the present invention, is characterized in that system is constituted
Including high temperature loading unit and measuring unit；Described high temperature loading unit is that the tensile axis of stretching-machine are vertically stretched to height
In warm stove, and clamp tested sample using tensile axis axle head fixture, make tested sample be in the visually transparent window position of high temperature furnace
Place；Described measuring unit is arranged on the outside of described high temperature furnace, comprising:
One arrowband ultra violet illumination light source, uniform with the ultraviolet light that wavelength is less than 380nm by described arrowband ultra violet illumination light source
Irradiate the tested sample being in high temperature furnace；
One ultraviolet sensitivity image capture module, is narrow in the front end setting of the ultraviolet imagery camera lens of ultraviolet sensitivity ccd camera
Band ultraviolet filter constitutes ultraviolet sensitivity image capture module, obtains tested sample with described ultraviolet sensitivity image capture module
The collection image of measured surface；
One infrared thermal sensation video camera, with described infrared thermal sensation video camera obtain not in the same time under tested sample tested table
The temperature information in face；
One scaling board, in order to demarcate the camera parameter of ultraviolet sensitivity ccd camera.
The measuring method based on the high-temperature material mechanical performance loading measurement system of ultra violet illumination dic for the present invention, its feature
It is to carry out according to the following procedure:
Step 1: tested sample is placed in high temperature furnace, and by the tensile axis axle head fixture clamping being arranged in high temperature furnace；
Ultraviolet source is projeced into the surface of tested sample；The ultraviolet imagery camera lens of adjustment ultraviolet sensitivity image capture module makes described purple
Outer sensitivity ccd camera can carry out image acquisition for the surface of described tested sample；Arranging infrared thermal sensation video camera makes to get profit
The temperature of tested sample can be recorded with described infrared thermal sensation video camera in real time；
Step 2: using described ultraviolet sensitivity ccd camera, image acquisition is carried out for the surface of described tested sample, obtain
Corresponding to each collection image of different temperatures, tested sample surface not in the same time, under different loading force, by respectively adopting to described
Collection image carries out dic image procossing, obtains the whole audience thermal deformation information on tested sample surface.
The present invention is loading force simultaneously under material is in heating condition, measures material temperature in real time, can be prevented effectively from thing
What itself radiant light of body surface face produced moves back correlation effect, thus certainty of measurement being greatly improved and reducing difficulty of test, with existing skill
Art is compared, and the present invention has the beneficial effect that:
1st, the present invention using wavelength, send out by the narrow-band ultraviolet light lighting source in the range of arrowband ultraviolet filter band-pass wavelength
The ultraviolet light going out, by pyrometry sample, its centre wavelength avoids the spontaneous heating radiant light of material under high temperature to uniform irradiation completely
Wavelength；Recycle ultraviolet filter to separate the ultraviolet light of light source with material heat radiation light, it is to avoid the interference of material heat radiation, make
Image capturing system being capable of blur-free imaging；(common lens are to ultraviolet ultraviolet light can be made effectively to pass through using ultraviolet imagery camera lens
Light transmission rate is very low, affects blur-free imaging), simultaneously using ultraviolet sensitivity ccd camera, can be (general to ultraviolet image sensitive imaging
Logical ccd camera insensitive to ultraviolet it is impossible to imaging).
2nd, stretching-machine is matched by the present invention with high temperature furnace, inside the stretch insertion high temperature furnace of stretching-machine, using fixture
Clamping sample, realizes carrying out the loading of power while material is heated, and shoots loading procedure by pyroceram window.
3rd, the present invention utilizes infrared thermal sensation video camera captured in real-time sample, successfully avoids high temperature furnace own temperature sensor strip
The temperature error come, realizes the real-time precision measurment to measured material temperature.
4th, the present invention processes, using related software in computer, the whole field deformation information obtaining material under high temperature, is 1000 DEG C
Above material deformation measurement provides a kind of high accuracy and noncontact and convenient-to-running measuring system and method.
Brief description
Fig. 1 constitutes schematic diagram for present system；
Fig. 2 is material itself thermal radiation optical spectrum curve synoptic diagram under different temperatures of the present invention；
In figure label: 1 ultraviolet sensitivity ccd camera, 2 ultraviolet imagery camera lenses, 3 arrowband ultraviolet filters, 4 arrowband ultraviolets
Lighting source, 5 scaling boards, 6 support systems, 7 computers, 8 high temperature furnaces, 9 stretching-machines, 10 infrared thermal sensation video cameras, 11
Tested sample.
Specific embodiment
In the present embodiment, the high-temperature material mechanical performance based on ultra violet illumination dic loads measuring method is: sets for being in
Fixed temperature environment the tested sample under being in the stress state of setting, the ultraviolet source that wavelength is less than 380nm is projeced into
The surface of tested sample；Using ultraviolet sensitivity image capture module, image acquisition is carried out for the surface of described tested sample 11,
Obtain each collection image corresponding to different temperatures, tested sample surface not in the same time, under different loading force, by respectively adopting
Collection image carries out dic image procossing, obtains the whole audience thermal deformation information on tested sample surface.
In the present embodiment, measuring method is adapted to the measurement process that temperature environment is 1000 DEG C～3000 DEG C.
Referring to Fig. 1, the system of the high-temperature material mechanical performance loading measurement system based on ultra violet illumination dic in the present embodiment
Constitute and include high temperature loading unit, measuring unit and the computer 7 for carrying out data processing；High temperature loading unit is to draw
The tensile axis stretching machine 9 vertically stretch in high temperature furnace 8, and using tensile axis axle head fixture clamp tested sample 11, make by
Test specimens 11 are at the visually transparent window position of high temperature furnace 8；Measuring unit is arranged on the outside of high temperature furnace 8, comprising:
Wavelength is less than the ultraviolet light uniform irradiation of 380nm by arrowband ultra violet illumination light source 4 with arrowband ultra violet illumination light source 4
It is in the tested sample 11 in high temperature furnace 8.
Ultraviolet sensitivity image capture module, is narrow in the front end setting of the ultraviolet imagery camera lens 2 of ultraviolet sensitivity ccd camera 1
Band ultraviolet filter 3 constitutes ultraviolet sensitivity image capture module, obtains tested sample 11 with ultraviolet sensitivity image capture module
The collection image of measured surface.
Infrared thermal sensation video camera 10, with infrared thermal sensation video camera 10 obtain not in the same time under tested sample 11 tested table
The temperature information in face.
Scaling board 5, is adjacent to tested sample 11 surface using ultraviolet sensitivity ccd collected by camera scaling board in camera fields of view
The image of diverse location, in order to demarcate the camera parameter of ultraviolet sensitivity ccd camera, and then demarcates ultraviolet sensitivity image capture module
Optical parametric.
In being embodied as, ultraviolet sensitivity ccd camera 1 and infrared thermal sensation video camera 10 are separately fixed at base by screw
On, on horizontal guide rail on being fixed on spider for the floor installation, support system is constituted by base and horizontal guide rail and spider
6 so that ultraviolet sensitivity ccd camera 1 and infrared thermal sensation video camera 10 can obtain respectively in inclination angle and horizontal level and highly going up
A range of adjustment, and then enable ultraviolet sensitivity ccd camera 1 and infrared thermal sensation video camera 10 obtain respectively tested
The surface image of sample 11.
Measurement process:
Step 1: tested sample is placed in high temperature furnace, and by the tensile axis axle head fixture clamping being arranged in high temperature furnace；
Ultraviolet source is projeced into the surface of tested sample；The ultraviolet imagery camera lens of adjustment ultraviolet sensitivity image capture module makes described purple
Outer sensitive image acquisition module can carry out image acquisition for the surface of described tested sample；Arranging infrared thermal sensation video camera makes
Can must record the temperature of tested sample using described infrared thermal sensation video camera in real time.
Step 2: using ultraviolet sensitivity image capture module, image acquisition is carried out for the surface of tested sample, obtain and correspond to
In each collection image of different temperatures, tested sample surface not in the same time, under different loading force, by entering to each collection image
Row dic image procossing, obtains the whole audience thermal deformation information on tested sample surface.
The spontaneous radiation of material is few near ultraviolet region, and in the present invention, arrowband ultra violet illumination light source 4 is to adopt narrow band light
Spectrum led array, spectral centroid wavelength avoids the radiation spectrum that tested sample produces at high temperature, and spectral bandwidth is chosen as 5～
10nm.
Fig. 2 show the material thermal spectrum under more than 1000 DEG C different temperatures, with the rising of temperature, material itself spoke
Penetrate spectrum to short-wave band extension, cover whole visible region (390nm～780nm).And the ultraviolet light wave band (wavelength selected
Below 380nm) it is located at outside material itself high temperature heat radiation wave band, the interference of high temperature heat radiation light can be prevented effectively from.
Claims (2)
1. a kind of high-temperature material mechanical performance based on ultra violet illumination dic loads measuring method, for the temperature ring being in setting
Border the tested sample under being in the stress state of setting, by light source projects in the surface of described tested sample；Adopted using image
Collection module carries out image acquisition for the surface of described tested sample, obtain corresponding to different temperatures, not in the same time, different load
Each collection image on the tested sample surface under power, by carrying out dic image procossing to described each collection image, obtains tested
The whole audience thermal deformation information on sample surface；It is characterized in that: described light source is the ultraviolet source that wavelength is less than 380nm, described image is adopted
Integrate module as ultraviolet sensitivity image capture module.
2. the high-temperature material mechanical performance based on ultra violet illumination dic loads measuring method, its feature according to claim 1
It is: described temperature environment is 1000 DEG C～3000 DEG C.
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| CN201410840914.9A CN104535412B (en) | 2014-12-29 | 2014-12-29 | Ultraviolet illumination DIC (digital image correction)-based mechanical property loading measuring system and method for high-temperature material |
| CN201610958243.5A CN106468636A (en) | 2014-12-29 | 2014-12-29 | High-temperature material mechanical performance loading measurement system based on ultra violet illumination DIC |
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| CN201410840914.9A CN104535412B (en) | 2014-12-29 | 2014-12-29 | Ultraviolet illumination DIC (digital image correction)-based mechanical property loading measuring system and method for high-temperature material |
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| CN201610958243.5A Pending CN106468636A (en) | 2014-12-29 | 2014-12-29 | High-temperature material mechanical performance loading measurement system based on ultra violet illumination DIC |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2819262C1 (en) * | 2024-01-10 | 2024-05-16 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) | Method of determining mechanical stresses in metal structures |
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| CN107255454B (en) * | 2017-07-12 | 2019-03-19 | 北京航空航天大学 | A kind of multiple dimensioned multi-functional strain measurement system of superhigh temperature based on ultraviolet imagery DIC and measurement method |
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| JPH10317010A (en) * | 1997-05-14 | 1998-12-02 | Nippon Koshuha Steel Co Ltd | Instrument for measuring shape of material to be heat-treated and method for measuring shape thereof |
| JP2000146787A (en) * | 1998-11-05 | 2000-05-26 | Nippon Steel Corp | Measuring method for restriction in tensile test |
| CN201096733Y (en) * | 2007-04-19 | 2008-08-06 | 华东理工大学 | A measuring device for coated layer high-temperature worm distortion |
| CN101201245A (en) * | 2007-12-24 | 2008-06-18 | 中国人民武装警察部队学院 | Method for measuring deformation of metallic material in hyperthermia mechanical test as well as observation instrument |
| CN102003946B (en) * | 2010-09-02 | 2012-06-20 | 北京航空航天大学 | High-temperature three-dimensional digital image related measurement system and measurement method |
| CN103558243B (en) * | 2013-11-19 | 2015-10-07 | 北京航空航天大学 | A kind of high-speed aircraft hot surface full field deformation measure device based on optical means |
| CN104034601A (en) * | 2014-07-03 | 2014-09-10 | 哈尔滨工业大学 | Method for accurately determining high-temperature mechanical property parameters of heat preventing material based on digital image related technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2819262C1 (en) * | 2024-01-10 | 2024-05-16 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) | Method of determining mechanical stresses in metal structures |
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