CN104535412A - 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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- CN104535412A CN104535412A CN201410840914.9A CN201410840914A CN104535412A CN 104535412 A CN104535412 A CN 104535412A CN 201410840914 A CN201410840914 A CN 201410840914A CN 104535412 A CN104535412 A CN 104535412A
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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 mechanical property measuring system and the measuring method thereof of the whole field deformation under a kind of power for high temp objects surface, Thermal Load, under being applied to each field hot conditions such as machine-building, Aero-Space, material, strain the measurement with distortion.
Background technology
The Measurement accuracy of high-temperature material mechanical mechanics property under the high temperature conditions, most important to the reliability assessment of aerospace flight vehicle materials and structures, life prediction and safe design, obtaining distortion under material surface high-temperature condition and strain field information is key to its Study on Mechanical Properties and basis.In prior art, for the measurement of high-temperature material mechanical mechanics property under the high temperature conditions, there are the following problems:
One is the full field deformation measure technology also do not adapted for the high temperature of more than 1000 DEG C;
Two is that traditional contact deformation measurement method can only realize single-point or average deformation information, cannot obtain whole audience information.In noncontact whole audience optical measurement method, laser speckle interferometry method (ESPI) is not only harsh to environmental requirement, and material because of temperature height in rubescent state under cannot measure;
Three is loadings that classic method cannot realize carrying out the while that high temperature furnace and drawing machine being engaged in heating power, simultaneously measured by himself temperature sensor of high temperature furnace is the temperature of furnace gas, owing to there is temperature contrast between measured material and furnace gas, the temperature that therefore temperature sensor records not is the temperature of measured material;
Digital Image Correlation Method (Digital Image Correlation, DIC) is a kind of whole audience non-contact method, is widely used in the measurement in each fields such as machine-building, Aero-Space, material; But the surperficial spontaneous spectrum of material is with the superposition of imaging illumination light source during owing to heating, when temperature is higher than 1000 DEG C, specimen surface has burnt and has redly approximately reached white.Surface emitting spectrum has covered whole visible region (wavelength 390nm ~ 780nm), and radiation intensity will be greater than lighting source intensity, cause the luminance saturation of gathered image, thus occurs serious moving back correlation effect.
Be illustrated in figure 2 the material thermal spectrum under more than 1000 DEG C different temperatures, as seen along with the rising of temperature, its thermal spectrum has the trend (and radiation wavelength is toward the skew of shortwave direction) of translation from right to left.At 1000 DEG C, radiation spectrum energy is also fainter at 500nm wave band, but to 1400 DEG C, radiation spectrum all also has transmitting in purple light section (wavelength 380nm ~ 400nm).Therefore, under this high-temperature condition, common monochromatic illumination light source (as 450nm blue light) and filtering cannot detect useful information from sample reflectance spectrum.
Summary of the invention
The present invention is the weak point for avoiding existing for above-mentioned prior art, provides a kind of high-temperature material mechanical property loading measurement system based on ultra violet illumination DIC and measuring method, to realizing the non-cpntact measurement of more than 1000 DEG C material whole audience strains.
The present invention is that technical solution problem adopts following technical scheme:
The high-temperature material mechanical property that the present invention is based on ultra violet illumination DIC adds load measuring method, be characterized in: for being in the temperature environment of setting and the tested sample be under the stress state of setting, ultraviolet source wavelength being less than 380nm is projeced into the surface of described tested sample; Ultraviolet sensitivity image capture module is utilized to carry out image acquisition for the surface of described tested sample, obtain each collection image corresponding to different temperatures, tested sample surface not in the same time, under different loading force, by carrying out DIC image procossing to described each collection image, obtain the whole audience thermal deformation information on tested sample surface.
The high-temperature material mechanical property that the present invention is based on ultra violet illumination DIC adds load measuring method, is characterized in: described temperature environment is 1000 DEG C ~ 3000 DEG C.
The present invention is based on the high-temperature material mechanical property loading measurement system of ultra violet illumination DIC, be characterized in that System's composition comprises high temperature loading unit and measuring unit; Described high temperature loading unit is vertically stretched in high temperature furnace by the tensile axis of drawing machine, and utilize tensile axis axle head holder tested sample, makes tested sample be in the visual transparency window position of high temperature furnace; Described measuring unit is arranged on the outside of described high temperature furnace, comprising:
One arrowband ultra violet illumination light source, ultraviolet light uniform irradiation wavelength being less than 380nm with described arrowband ultra violet illumination light source is in the tested sample in high temperature furnace;
One ultraviolet sensitivity image capture module, be arrange arrowband ultraviolet filter to form ultraviolet sensitivity image capture module in the front end of the ultraviolet imagery camera lens of ultraviolet sensitivity CCD camera, obtain the collection image of the measured surface of tested sample with described ultraviolet sensitivity image capture module;
One infrared hotness video camera, with described infrared hotness video camera obtain not in the same time under the temperature information of measured surface of tested sample;
One scaling board, in order to demarcate the camera parameter of ultraviolet sensitivity CCD camera.
The present invention is based on the measuring method of the high-temperature material mechanical property loading measurement system of ultra violet illumination DIC, be characterized in carrying out according to the following procedure:
Step 1: tested sample is placed in high temperature furnace, and by the tensile axis axle head holder be 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 ultraviolet sensitivity CCD camera can carry out image acquisition for the surface of described tested sample; Arrange infrared hotness video camera to make to utilize described infrared hotness video camera can record the temperature of tested sample in real time;
Step 2: utilize described ultraviolet sensitivity CCD camera to carry out image acquisition for the surface of described tested sample, obtain each collection image corresponding to different temperatures, tested sample surface not in the same time, under different loading force, by carrying out DIC image procossing to described each collection image, obtain the whole audience thermal deformation information on tested sample surface.
The present invention is simultaneously loading force in a heated condition at material place, real-time measurement material temperature, that can effectively avoid body surface self radiant light to produce moves back correlation effect, thus significantly improves measuring accuracy and reduce difficulty of test, compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention utilizes the ultraviolet light that wavelength sends at the arrowband ultraviolet illumination light source that arrowband ultraviolet filter band leads in wavelength coverage, and uniform irradiation is by pyrometry sample, and its centre wavelength avoids the wavelength of the spontaneous heating radiant light of material under high temperature completely; The ultraviolet light of light source is separated with material heat radiation light by recycling ultraviolet filter, avoids material heat radiation interference, enables image capturing system blur-free imaging; Adopt ultraviolet imagery camera lens can make ultraviolet light effectively through (common lens is very low to uv transmittance, affect blur-free imaging), use ultraviolet sensitivity CCD camera simultaneously, can to ultraviolet image sensitive imaging (common CCD camera be insensitive to ultraviolet, cannot imaging).
2, drawing machine matches with high temperature furnace by the present invention, and the stretching bar of drawing machine inserts high temperature furnace inside, utilizing clamp sample, realizing the loading to carrying out power while heating materials, and by pyroceram window shooting loading procedure.
3, the present invention utilizes infrared hotness video camera captured in real-time sample, and the temperature error successfully avoiding high temperature furnace own temperature sensor to bring, realizes the real―time precision measurment to measured material temperature.
4, the present invention utilizes related software process in computing machine to obtain the whole field deformation information of material under high temperature, for more than 1000 DEG C material deformation measurements provide a kind of high precision and noncontact and convenient-to-running measuring system and method.
Accompanying drawing explanation
Fig. 1 is that present system forms schematic diagram;
Fig. 2 is material self thermal radiation optical spectrum curve synoptic diagram under different temperatures of the present invention;
Number in the figure: 1 ultraviolet sensitivity CCD camera, 2 ultraviolet imagery camera lenses, 3 arrowband ultraviolet filters, 4 arrowband ultra violet illumination light sources, 5 scaling boards, 6 support systems, 7 computing machines, 8 high temperature furnaces, 9 drawing machines, 10 infrared hotness video cameras, 11 tested sample.
Embodiment
Adding load measuring method based on the high-temperature material mechanical property of ultra violet illumination DIC in the present embodiment is: for being in the temperature environment of setting and the tested sample be under the stress state of setting, ultraviolet source wavelength being less than 380nm is projeced into the surface of tested sample; Ultraviolet sensitivity image capture module is utilized to carry out image acquisition 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 carrying out DIC image procossing to each collection image, obtain the whole audience thermal deformation information on tested sample surface.
In the present embodiment, measuring method is adapted to the measuring process that temperature environment is 1000 DEG C ~ 3000 DEG C.
See Fig. 1, in the present embodiment, comprise high temperature loading unit, measuring unit and the computing machine 7 for carrying out data processing based on the System's composition of the high-temperature material mechanical property loading measurement system of ultra violet illumination DIC; High temperature loading unit is vertically stretched in high temperature furnace 8 by the tensile axis of drawing machine 9, and utilize tensile axis axle head holder tested sample 11, makes tested sample 11 be in the visual transparency window position of high temperature furnace 8; Measuring unit is arranged on the outside of high temperature furnace 8, comprising:
Arrowband ultra violet illumination light source 4, ultraviolet light uniform irradiation wavelength being less than 380nm with arrowband ultra violet illumination light source 4 is in the tested sample 11 in high temperature furnace 8.
Ultraviolet sensitivity image capture module, be arrange arrowband ultraviolet filter 3 in the front end of the ultraviolet imagery camera lens 2 of ultraviolet sensitivity CCD camera 1 to form ultraviolet sensitivity image capture module, obtain the collection image of the measured surface of tested sample 11 with ultraviolet sensitivity image capture module.
Infrared hotness video camera 10, with infrared hotness video camera 10 obtain not in the same time under the temperature information of measured surface of tested sample 11.
Scaling board 5, utilizes ultraviolet sensitivity CCD camera collection scaling board in camera fields of view, be adjacent to the image of the diverse location on tested sample 11 surface, in order to demarcate the camera parameter of ultraviolet sensitivity CCD camera, and then demarcates the optical parametric of ultraviolet sensitivity image capture module.
In concrete enforcement, ultraviolet sensitivity CCD camera 1 and infrared hotness video camera 10 are separately fixed on base by screw, floor installation is being fixed on the horizontal guide rail on tripod, support system 6 is formed by base and horizontal guide rail and tripod, make ultraviolet sensitivity CCD camera 1 and infrared hotness video camera 10 on inclination angle and horizontal level and height, the adjustment of certain limit can be obtained respectively, and then make ultraviolet sensitivity CCD camera 1 and infrared hotness video camera 10 can obtain the surface image of tested sample 11 respectively.
Measuring process:
Step 1: tested sample is placed in high temperature furnace, and by the tensile axis axle head holder be 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 ultraviolet sensitivity image capture module can carry out image acquisition for the surface of described tested sample; Arrange infrared hotness video camera to make to utilize described infrared hotness video camera can record the temperature of tested sample in real time.
Step 2: utilize ultraviolet sensitivity image capture module to carry out image acquisition for the surface of tested sample, obtain each collection image corresponding to different temperatures, tested sample surface not in the same time, under different loading force, by carrying out DIC image procossing to each collection image, obtain 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 adopts narrow-band spectrum LED array, and spectral centroid wavelength avoids the radiation spectrum that tested sample at high temperature produces, and spectral bandwidth is chosen as 5 ~ 10nm.
Figure 2 shows that the material thermal spectrum under more than 1000 DEG C different temperatures, along with the rising of temperature, material self radiation spectrum is expanded to short-wave band, has covered whole visible region (390nm ~ 780nm).And the ultraviolet light wave band (below wavelength 380nm) selected is positioned at outside material self high temperature heat radiation wave band, high temperature heat radiation light can be effectively avoided to disturb.
Claims (4)
1. one kind adds load measuring method based on the high-temperature material mechanical property of ultra violet illumination DIC, it is characterized in that: for being in the temperature environment of setting and the tested sample be under the stress state of setting, ultraviolet source wavelength being less than 380nm is projeced into the surface of described tested sample; Ultraviolet sensitivity image capture module is utilized to carry out image acquisition for the surface of described tested sample, obtain each collection image corresponding to different temperatures, tested sample surface not in the same time, under different loading force, by carrying out DIC image procossing to described each collection image, obtain the whole audience thermal deformation information on tested sample surface.
2. add load measuring method based on the high-temperature material mechanical property of ultra violet illumination DIC according to claim 1, it is characterized in that: described temperature environment is 1000 DEG C ~ 3000 DEG C.
3., based on a high-temperature material mechanical property loading measurement system of ultra violet illumination DIC, it is characterized in that System's composition comprises high temperature loading unit and measuring unit; Described high temperature loading unit vertically stretches in high temperature furnace (8) by the tensile axis of drawing machine (9), and utilize tensile axis axle head holder tested sample (11), make tested sample (11) be in the visual transparency window position of high temperature furnace (8); Described measuring unit is arranged on the outside of described high temperature furnace (8), comprising:
One arrowband ultra violet illumination light source (4), ultraviolet light uniform irradiation wavelength being less than 380nm with described arrowband ultra violet illumination light source (4) is in the tested sample (11) in high temperature furnace (8);
One ultraviolet sensitivity image capture module, be arrange arrowband ultraviolet filter (3) to form ultraviolet sensitivity image capture module in the front end of the ultraviolet imagery camera lens (2) of ultraviolet sensitivity CCD camera (1), obtain the image of the measured surface of tested sample (11) with described ultraviolet sensitivity image capture module;
One infrared hotness video camera (10), with described infrared hotness video camera (10) obtain not in the same time under the temperature information of measured surface of tested sample (11);
One scaling board (5), in order to demarcate the camera parameter of ultraviolet sensitivity CCD camera.
4. utilize a measuring method for the high-temperature material mechanical property loading measurement system based on ultra violet illumination DIC described in claim 3, it is characterized in that carrying out according to the following procedure:
Step 1: tested sample is placed in high temperature furnace, and by the tensile axis axle head holder be 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 ultraviolet sensitivity CCD camera can carry out image acquisition for the surface of described tested sample; Arrange infrared hotness video camera to make to utilize described infrared hotness video camera can record the temperature of tested sample in real time;
Step 2: utilize described ultraviolet sensitivity image capture module to carry out image acquisition for the surface of described tested sample, obtain each collection image corresponding to different temperatures, tested sample surface not in the same time, under different loading force, by carrying out DIC image procossing to described each collection image, obtain the whole audience thermal deformation information on tested sample surface.
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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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| CN105758719A (en) * | 2016-04-26 | 2016-07-13 | 河海大学 | Homogeneous strain optical measurement device based on double-mirror reflection and method |
| CN106124336A (en) * | 2016-07-22 | 2016-11-16 | 吉林大学 | High-temperature Superplasticity stretching large-deformation measuring apparatus and method |
| CN106500612A (en) * | 2016-10-12 | 2017-03-15 | 北京科技大学 | The non-contact measurement system of material members high temperature deformation and method |
| CN107152917A (en) * | 2017-07-24 | 2017-09-12 | 哈尔滨工业大学 | A kind of stereoscopic vision structure three-dimensional deforms measurement of full field method |
| CN107255454A (en) * | 2017-07-12 | 2017-10-17 | 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 measuring method |
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| CN105758719B (en) * | 2016-04-26 | 2018-03-16 | 河海大学 | A kind of homogeneous strain optical measuring device and method based on bimirror reflection |
| CN105758719A (en) * | 2016-04-26 | 2016-07-13 | 河海大学 | Homogeneous strain optical measurement device based on double-mirror reflection and method |
| CN106124336A (en) * | 2016-07-22 | 2016-11-16 | 吉林大学 | High-temperature Superplasticity stretching large-deformation measuring apparatus and method |
| CN106124336B (en) * | 2016-07-22 | 2018-11-02 | 吉林大学 | High-temperature Superplasticity stretches large-deformation measuring device and method |
| CN106500612A (en) * | 2016-10-12 | 2017-03-15 | 北京科技大学 | The non-contact measurement system of material members high temperature deformation and method |
| CN106500612B (en) * | 2016-10-12 | 2019-08-06 | 北京科技大学 | The non-contact measurement system and method for material members high temperature deformation |
| CN107255454A (en) * | 2017-07-12 | 2017-10-17 | 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 measuring method |
| 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 |
| CN107152917A (en) * | 2017-07-24 | 2017-09-12 | 哈尔滨工业大学 | A kind of stereoscopic vision structure three-dimensional deforms measurement of full field method |
| CN109115114B (en) * | 2018-07-19 | 2021-04-27 | 成都航大新材料有限公司 | Laser extensometer and measuring method thereof |
| CN109115114A (en) * | 2018-07-19 | 2019-01-01 | 成都航大新材料有限公司 | Laser extensometer and its measurement method |
| CN109141267A (en) * | 2018-08-29 | 2019-01-04 | 清华大学 | Measure the method and device of surface deformation of material |
| CN111289361A (en) * | 2020-02-17 | 2020-06-16 | 合肥工业大学 | Material mechanical property measuring device and method based on high-resolution digital image correlation |
| CN111289361B (en) * | 2020-02-17 | 2022-06-07 | 合肥工业大学 | Material mechanical property measuring device and method based on high-resolution digital image correlation |
| CN112285147A (en) * | 2020-10-10 | 2021-01-29 | 中国科学技术大学 | Method for measuring full-field strain of ultrahigh-temperature object based on digital image correlation method |
| CN112629839A (en) * | 2020-11-19 | 2021-04-09 | 西北工业大学 | Method for measuring strain around turbine blade air film hole |
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