CN105651433B - The separation method of dynamic stress and static stress in dynamic photo-elasticity system - Google Patents
The separation method of dynamic stress and static stress in dynamic photo-elasticity system Download PDFInfo
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- CN105651433B CN105651433B CN201511024883.0A CN201511024883A CN105651433B CN 105651433 B CN105651433 B CN 105651433B CN 201511024883 A CN201511024883 A CN 201511024883A CN 105651433 B CN105651433 B CN 105651433B
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- 230000003068 static effect Effects 0.000 title claims abstract description 111
- 238000000926 separation method Methods 0.000 title claims abstract description 29
- 239000007787 solid Substances 0.000 claims abstract description 28
- 230000007547 defect Effects 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 230000002950 deficient Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 description 5
- 238000002604 ultrasonography Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/241—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet by photoelastic stress analysis
Abstract
The present invention relates to the separation methods of dynamic stress and static stress in a kind of dynamic photo-elasticity system, in one embodiment, comprising: dynamic stress and the photoelastic image in static stress supercoated stress field and the photoelastic image in static stress field in acquisition transparent solid；The measuring point for separating dynamic stress in photoelastic image is chosen, and reads supercoated stress gray value of image and static stress gray value of image at the measuring point respectively；Seek the angle of dynamic stress principal stress Yu static stress principal stress；Based on gray value of image and angle information, the dynamic stress at measuring point is isolated.In another embodiment, then the photoelastic image of dynamical field is acquired, the point for separating static stress in photoelastic image is chosen, and read dynamic stress gray value of image, isolates the static stress at selected point.The embodiment of the present application can be separated the static stress near defect in solid by being analyzed and processed to photoelastic gray value of image, or the dynamic stress near defect is separated, and also extend to the separation of small dynamic stress and small static stress.
Description
Technical field
This application involves points of dynamic stress in technical field of acoustics more particularly to a kind of dynamic photo-elasticity system and static stress
From method.
Background technique
It will appear what static stress (such as residual stress) and dynamic stress (such as ultrasonic stress) were superimposed in photodynamics experiment
Situation needs to process transparent sample, makes spy especially when using dynamic photoelasticity system research sound field scattering problems
Fixed defect.In process, residual stress can be generated at edge, being formed has the residual stress field being centainly distributed, thus
Stronger noise is introduced into the image of system photographs.In the photoelastic image with residual stress, it is difficult to ultrasonic signal is differentiated,
It is separated.
From the point of view of patent published at present and document, the method that there is no the residual stress near separation defect at present,
The research of propagation and scattering problems of the ultrasonic wave near defect is hindered to a certain extent.
Summary of the invention
The purpose of the application is to provide the separation of dynamic stress and static stress in a kind of dynamic photoelasticity system for existing defect
Method can determine dynamic stress by the photoelastic image of the photoelastic image of superimposed field and static stress field, can also be photoelastic by superimposed field
Image and the photoelastic image of dynamical field, determine static stress.
To achieve the above object, on the one hand, the present invention provides dynamic stress in a kind of dynamic photoelasticity system and static stress
Separation method determines dynamic stress by the photoelastic image of the photoelastic image of superimposed field and static stress field, which comprises
Acquire dynamic stress and the photoelastic image in static stress supercoated stress field and the photoelastic image in static stress field in transparent solid；
The measuring point for separating dynamic stress in the photoelastic image is chosen, and reads supercoated stress gray value of image at measuring point respectively
With static stress gray value of image；
Seek the angle of dynamic stress principal stress Yu static stress principal stress；
Based on angle information described in described image sum of the grayscale values, the dynamic stress at measuring point is isolated.
Preferably, dynamic stress and the photoelastic image in static stress supercoated stress field and static stress in the acquisition transparent solid
The photoelastic image in field, comprising:
Utilize the dynamic stress and the photoelastic figure of static stress superimposed field in the defective transparent solid of dynamic photo-elasticity system acquisition band
Picture, and under the conditions of there is no in transparent solid dynamic stress near defect, acquire the photoelastic image in static stress field.
Preferably, described to choose the measuring point that dynamic stress is separated in the photoelastic image, and read be superimposed at the measuring point respectively
The gray value of image of stress image sum of the grayscale values static stress, before the step further include: by program of interpreting blueprints, read the superposition
The rgb value of the photoelastic image of stress, and red, blue channel is filtered, remake image gray processing processing.
Preferably, the angle of dynamic stress principal stress Yu static stress principal stress is sought, comprising:
Determine dynamic stress deviator stress to the folder with static stress principal direction of stress by the geometrical relationship of static stress and measuring point
Angle.
It is preferably based on angle information described in described image sum of the grayscale values, isolates the dynamic stress at measuring point, comprising:
Pass through formulaIsolate the dynamic stress at measuring point；
Wherein, A is supercoated stress gray value of image, and B is static stress gray value of image, and C is dynamic stress gray value of image, θ
For the angle in dynamic stress deviator stress direction and static stress deviator stress direction.
On the other hand, the present invention provides the separation methods of dynamic stress and static stress in a kind of dynamic photo-elasticity system, lead to
The photoelastic image of superimposed field and the photoelastic image of dynamical field are crossed, determines static stress, which comprises
Acquire dynamic stress and the photoelastic image in static stress supercoated stress field and the photoelastic image of dynamical field in transparent solid；
The measuring point for separating static stress in the photoelastic image is chosen, and reads supercoated stress image ash at the measuring point respectively
The gray value of image of angle value and dynamic stress；
Seek the angle of dynamic stress principal stress Yu static stress principal stress；
Based on angle information described in described image sum of the grayscale values, the static stress at measuring point is isolated.
Preferably, dynamic stress and the photoelastic image in static stress supercoated stress field and dynamic stress in the acquisition transparent solid
The photoelastic image in field, comprising:
Utilize the dynamic stress and the photoelastic figure of static stress superimposed field in the defective transparent solid of dynamic photo-elasticity system acquisition band
Picture, and under the conditions of there is no in transparent solid static stress near zero defect, acquire the photoelastic image of dynamical field.
Preferably, described to choose the measuring point that static stress is separated in the photoelastic image, and read be superimposed at the measuring point respectively
The gray value of image of stress image sum of the grayscale values dynamic stress, before the step further include: by program of interpreting blueprints, read the superposition
The rgb value of the photoelastic image of stress, and red, blue channel is filtered, remake image gray processing processing.
Preferably, the angle of dynamic stress deviator stress Yu static stress deviator stress is sought, comprising:
The folder of dynamic stress principal direction of stress Yu static stress principal direction of stress is determined by the geometrical relationship of static stress and measuring point
Angle.
It is preferably based on angle information described in described image sum of the grayscale values, isolates the static stress at measuring point, comprising:
Pass through formulaIsolate the static stress at selected point；
Wherein, A is supercoated stress gray value of image, and B is dynamic stress gray value of image, and C is quiet gray value of image, and θ is
The angle in deviator stress direction and static stress deviator stress direction.
The present invention can be carried out the static stress near defect in solid by being analyzed and processed to photoelastic gray value of image
Separation, or can separate the dynamic stress of zero defect attachment in solid, also extend to small dynamic stress and small static stress
Separation.The primary condition of separation supercoated stress field can determine according to demand, to obtain dynamical field value, need supercoated stress field
The gray value of image and the gray value of static stress field picture are as primary condition.To obtain the value of static stress field picture, need
The gray value of the gray value of image and dynamical field image of wanting supercoated stress field is as primary condition.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description briefly to introduce.It should be evident that is reflected in following accompanying drawings is only this
A part of the embodiment of invention, for those of ordinary skill in the art, without any creative labor, also
The other embodiment of the present invention can be obtained according to these attached drawings.And all these embodiments or embodiment are all of the invention
Within protection scope.
Fig. 1 is dynamic photo-elasticity imaging system；
Fig. 2 (a) is one of dynamic and static stress separation process figure provided in an embodiment of the present invention；
Fig. 2 (b) is the two of dynamic and static stress separation process figure provided in an embodiment of the present invention；
Fig. 3 ultrasound stress and the photoelastic gray level image schematic diagram of residual stress superimposed field；
The photoelastic gray level image schematic diagram in the residual stress field Fig. 4；
The supercoated stress gray value of image of measuring point is read in Fig. 5 Fig. 3；
The residual stress gray value of image of measuring point is read in Fig. 6 Fig. 4；
Fig. 7 ultrasound principal stress and residual stress principal stress angle schematic diagram.
Specific embodiment
Below by attached drawing and specific embodiment, the present invention is further detailed, it should be appreciated that these
Embodiment, which is only used for being described in more detail, to be used, and but should not be understood as being not intended to present invention is limited in any form
It limits the scope of the invention.
In a specific embodiment, the present invention provides the separation of dynamic stress and static stress in a kind of dynamic photoelasticity system
Method determines dynamic stress by the photoelastic image of the photoelastic image of superimposed field and static stress field.In the present embodiment, dynamic stress is with super
For sound stress, static stress is described by taking residual stress as an example.Fig. 2 (a) and (b) are provided in an embodiment of the present invention dynamic and static
Stress separation process figure, by the step of shown in Fig. 2 (a), the present embodiment carries out dynamic stress and static stress separation are as follows:
It is photoelastic to acquire dynamic stress and the photoelastic image in static stress supercoated stress field and static stress field in transparent solid by S11
Image.
It is acquired using dynamic photo-elasticity imaging system shown in FIG. 1 with the ultrasonic stress and remnants in defective transparent solid
The photoelastic image in Stress superposition field.Then by interpreting blueprints program, the photoelastic rgb value in supercoated stress field (three color values) can be obtained, due to
Used laser is green light, therefore is subject to G (green) value, filters out R (red) B (blue) channel, and carry out at gray processing
Reason, as shown in Figure 3.It should be noted that gray value size is determined by deviator stress in image, following example image all carries out ash
Degreeization processing；
Using defect in dynamic photo-elasticity imaging system shown in FIG. 1 acquisition transparent solid nearby without ultrasonic stress condition
Under, the photoelastic image in residual stress field, the image also carries out gray processing processing, as shown in Figure 4.
S12 chooses the measuring point for separating dynamic stress in the photoelastic image, and reads supercoated stress image at the measuring point respectively
Sum of the grayscale values static stress gray value of image.
The coordinate points for choosing the measuring point of ultrasonic stress to be separated on image pass through such as the coordinate points (404,366) in Fig. 5
Interpreting blueprints program, can obtain the measuring point supercoated stress gray value of image, herein be denoted as the supercoated stress gray value of image of the measuring point
A can obtain A=116 as shown in Figure 5；
Obtain in the case where no residual stress with same coordinate point among the above, as in Fig. 6 coordinate points (404,
366), by program of interpreting blueprints, it can get the measuring point residual stress gray value.Herein by the residual stress gray value of image of the measuring point
It is denoted as B, as shown in Figure 6, knows B=13.
S13 seeks the angle of dynamic stress principal stress Yu static stress principal stress.
Dynamic stress principal direction of stress and static stress principal direction of stress are determined by the geometrical relationship of static stress and selected point
Angle.Specifically:
The direction of fault location residual stress principal stress, can be according to the vertical defect boundary in residual stress field deviator stress direction
Characteristic acquires the angle theta of residual stress principal stress and ultrasonic principal stress by selected measuring point coordinate and central coordinate of circle geometrical relationship
=10.8 °, as shown in Figure 7.It should be noted that angle theta can change according to the changes in coordinates of selected measuring point.
S14 isolates the dynamic stress at measuring point based on angle information described in described image sum of the grayscale values.
According to the following formula, the dynamic stress at measuring point can be isolated, isolates ultrasound stress at measuring point in the present embodiment:
Wherein, A is supercoated stress gray value of image, and B is residual stress gray value of image, and C is ultrasonic stress image gray scale
Value, θ are the angle of residual stress principal stress and ultrasonic principal stress.
A, B, θ of above-mentioned acquisition are updated to formulaIn, just it can be successfully separated
Ultrasonic stress out, obtaining C as 54, C is ultrasonic stress image gray value.
In another specific embodiment, the present invention provides points of dynamic stress in a kind of dynamic photoelasticity system and static stress
Static stress is determined by the photoelastic image of superimposed field and the photoelastic image of dynamical field from method.In the present embodiment, dynamic stress with
For ultrasonic stress, static stress is described by taking residual stress as an example.Fig. 2 (a) and (b) be it is provided in an embodiment of the present invention it is dynamic,
Static stress separation process figure, by the step of shown in Fig. 2 (b), the present embodiment carries out dynamic stress and static stress separation are as follows:
S21 acquires dynamic stress and the photoelastic image in static stress supercoated stress field and the photoelastic figure of dynamical field in transparent solid
Picture.
It is acquired using dynamic photo-elasticity imaging system shown in FIG. 1 with the ultrasonic stress and remnants in defective transparent solid
The photoelastic image in Stress superposition field.Then by interpreting blueprints program, the photoelastic rgb value in supercoated stress field (three color values) can be obtained, due to
Used laser is green light, therefore is subject to G (green light) value, filters out R (red) B (blue) channel, and carry out at gray processing
Reason.It should be noted that gray value size is determined by deviator stress in image, following example image all carries out gray processing processing；
There is no residual stress item nearby using zero defect in dynamic photo-elasticity imaging system shown in FIG. 1 acquisition transparent solid
Under part, the ultrasonic photoelastic image of stress field, the image also carries out gray processing processing.
S22 chooses the measuring point for separating static stress in the photoelastic image, and reads supercoated stress image at the measuring point respectively
Sum of the grayscale values dynamic stress gray value of image.
The coordinate points for choosing the measuring point of residual stress to be separated on image can be obtained and be folded at the measuring point by program of interpreting blueprints
Add stress image gray value, the supercoated stress gray value of image at the measuring point is denoted as A herein；
It obtains and ultrasound stress image gray scale at the measuring point can get by program of interpreting blueprints with identical coordinate points among the above
Value, is denoted as B for the ultrasonic stress image gray value of the measuring point herein.
S23 seeks the angle of dynamic stress principal stress Yu static stress principal stress.
The folder of dynamic stress principal direction of stress Yu static stress principal direction of stress is determined by the geometrical relationship of static stress and measuring point
Angle.Specifically:
The direction of fault location residual stress principal stress, can be according to the spy on the vertical defect boundary of residual stress field principal direction of stress
Property, by selected burble point coordinate and central coordinate of circle geometrical relationship, acquire the angle of residual stress principal stress and ultrasonic principal stress
θ, as shown in Figure 7.It should be noted that angle theta can change according to the changes in coordinates of selected measuring point.
S24 isolates the static stress at measuring point based on angle information described in described image sum of the grayscale values.
According to the following formula, the static stress at measuring point can be isolated, isolates residual stress at measuring point in the present embodiment:
Wherein, A is supercoated stress gray value of image, and B is ultrasonic stress image gray value, and C is residual stress image grayscale
Value, θ are the angle of residual stress principal stress and ultrasonic principal stress.
A, B, θ of above-mentioned acquisition are updated to formulaIn, just it can be successfully separated
Residual stress out, C are residual stress gray value of images.
In embodiments of the present invention, for dynamic stress by taking ultrasonic stress as an example, static stress describes dynamic by taking residual stress as an example
The separation method of dynamic stress and static stress in photoelastic system is determined by the photoelastic image of the photoelastic image of superimposed field and static stress field
Dynamic stress；Static stress can also be determined by the photoelastic image of superimposed field and the photoelastic image of dynamical field.The present invention passes through to photoelastic
Gray value of image is analyzed and processed, and can separate the residual stress near defect in solid, or will be near defect in solid
Ultrasonic stress separation, also extend to the separation of small dynamic stress and small static stress.
Professional should further appreciate that, described in conjunction with the examples disclosed in the embodiments of the present disclosure
Unit and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software generally describes each exemplary composition and step according to function in the above description.
These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.
Professional technician can use different methods to achieve the described function each specific application, but this realization
It should not be considered as beyond the scope of the present invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can be executed with hardware, processor
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described specific embodiment has carried out further the purpose of the application, technical scheme and beneficial effects
It is described in detail, it should be understood that being not used to limit the application the foregoing is merely the specific embodiment of the application
Protection scope, within the spirit and principles of this application, any modification, equivalent substitution, improvement and etc. done should all include
Within the scope of protection of this application.
Claims (8)
1. the separation method of dynamic stress and static stress in a kind of dynamic photo-elasticity system, which is characterized in that the described method includes:
Acquire dynamic stress and the photoelastic image in static stress supercoated stress field and the photoelastic image in static stress field in transparent solid；
Choose the measuring point that dynamic stress is separated in the photoelastic image, and read at the measuring point respectively supercoated stress gray value of image and
Static stress gray value of image；
Seek the angle of dynamic stress principal stress Yu static stress principal stress；
Based on angle information described in described image sum of the grayscale values, pass through formulaIt obtains
Dynamic stress gray value of image, wherein A is supercoated stress gray value of image, and B is static stress gray value of image, and C is dynamic stress image
Gray value, θ are the angle in dynamic stress deviator stress direction and static stress deviator stress direction.
2. separation method according to claim 1, which is characterized in that dynamic stress and static stress in the acquisition transparent solid
The photoelastic image of the photoelastic image in supercoated stress field and static stress field, comprising:
Using the dynamic stress and the photoelastic image of static stress superimposed field in the defective transparent solid of dynamic photo-elasticity system acquisition band, with
And under conditions of there is no dynamic stress near defect in transparent solid, the photoelastic image in static stress field is acquired.
3. separation method according to claim 1, which is characterized in that described choose in the photoelastic image separates dynamic stress
Measuring point, and read supercoated stress gray value of image and static stress gray value of image at the measuring point respectively, also wrapped before the step
It includes: by program of interpreting blueprints, reading the rgb value of the photoelastic image of the supercoated stress, and filter red, blue channel, remake image grayscale
Change processing.
4. separation method according to claim 1, which is characterized in that seek dynamic stress principal stress and static stress principal stress
Angle, comprising:
The angle of dynamic stress principal direction of stress Yu static stress principal direction of stress is determined by the geometrical relationship of static stress and measuring point.
5. the separation method of dynamic stress and static stress in a kind of dynamic photo-elasticity system, which is characterized in that the described method includes:
Acquire dynamic stress and the photoelastic image in static stress supercoated stress field and the photoelastic image of dynamical field in transparent solid；
Choose the measuring point that static stress is separated in the photoelastic image, and read at the measuring point respectively supercoated stress gray value of image and
Dynamic stress gray value of image；
Seek the angle of dynamic stress principal stress Yu static stress principal stress；
Based on angle information described in described image sum of the grayscale values, pass through formulaIt obtains
Static stress gray value of image, wherein A is supercoated stress gray value of image, and B is dynamic stress gray value of image, and C is static stress image
Gray value, θ are the angle of dynamic stress principal direction of stress and static stress principal direction of stress.
6. separation method according to claim 5, which is characterized in that dynamic stress and static stress in the acquisition transparent solid
The photoelastic image in supercoated stress field and the photoelastic image of dynamical field, comprising:
Using the dynamic stress and the photoelastic image of static stress superimposed field in the defective transparent solid of dynamic photo-elasticity system acquisition band, with
And under the conditions of there is no static stress near zero defect in transparent solid, the photoelastic image of dynamical field is acquired.
7. separation method according to claim 5, which is characterized in that described choose in the photoelastic image separates static stress
Measuring point, and read supercoated stress gray value of image and dynamic stress gray value of image at the measuring point respectively, also wrapped before the step
It includes: by program of interpreting blueprints, reading the rgb value of the photoelastic image of the supercoated stress, and filter red, blue channel, remake image grayscale
Change processing.
8. separation method according to claim 5, which is characterized in that seek dynamic stress principal stress and static stress principal stress
Angle, comprising:
Static stress and the geometrical relationship of measuring point determine the angle of dynamic stress principal direction of stress Yu static stress principal direction of stress.
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| CN85100284B (en) * | 1985-04-01 | 1985-09-10 | 北京大学 | Automatic measuring method and apparatus |
| TW476846B (en) * | 2000-06-12 | 2002-02-21 | Hiwin Tech Corp | A measure method using photo-elastic analysis for finding the touching point between the ball and track profile |
| CN100468044C (en) * | 2005-03-17 | 2009-03-11 | 中国科学院半导体研究所 | Tester and method for residual stress of seniconductor material |
| CN103552225B (en) * | 2013-10-28 | 2015-11-25 | 郑州大学 | Transparent article injection compression molding process internal stress distribution real-time detection method |
| CN103575381B (en) * | 2013-11-14 | 2015-09-09 | 中国科学院声学研究所 | Based on the measuring method of the sound fields of ultrasonic transducers of dynamic photoelasticity |
| CN104458081B (en) * | 2014-12-03 | 2016-07-20 | 中国矿业大学 | A kind of method of stress measurement separating main stresses based on ultrasonic surface wave and device |
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