CN104297158A - Adjustable laser crack growth rate recording meter - Google Patents
Adjustable laser crack growth rate recording meter Download PDFInfo
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- CN104297158A CN104297158A CN201410603305.1A CN201410603305A CN104297158A CN 104297158 A CN104297158 A CN 104297158A CN 201410603305 A CN201410603305 A CN 201410603305A CN 104297158 A CN104297158 A CN 104297158A
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- laser
- growth rate
- line laser
- guide rail
- crack growth
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Abstract
The invention discloses an adjustable laser crack growth rate recording meter, and the application method thereof. The adjustable laser crack growth rate recording meter comprises two first type guide rail supports, a second type guide rail support, two guide rail pipes, a line laser power regulator, a line laser transmitter, two first type sliding blocks, a second type sliding block, a group of convex lenses with different focal lengths, a photoelectricity receiving device and a plurality of height-adjusting rods. According to the adjustable laser crack growth rate recording meter provided by the invention, the measurement of crack dynamic growth rate under various conditions with multiple angles in a large range is realized.
Description
Technical field
The present invention relates to a kind of Dynamic Crack Propagation rate test technology, for the deficiency of the method for application laser luminous flux displacement in the past, the method existing application laser luminous flux being measured to crack displacement carries out comprehensive improvement, under achieving multiple condition, the mensuration of multi-angle, on a large scale Dynamic Crack Propagation speed.
Background technology
In recent years, in Experimental Mechanics field, along with the development of experimental technique, much new measuring technique is referred in experiment gradually, be used for measuring the stress of sample, strain, displacement and the mechanical quantity needed for other, thereupon also more and more higher to the requirement of the convenience of experimental precision, accuracy, metering etc.Wherein experimental precision and accuracy have decisive role for the impact of experimental result.In precision, not only the measuring error of experimental technique needs to consider, reduces experimental test procedures and the impact of test piece deformation is also become to the important method improving experimental precision.Optical measurement has simply, noncontact, be easy to many-sided advantages such as realization, is therefore more and more applied to experiment.
In Dynamic Fracture experiment, the method for the most basic test sample distortion in the past pastes foil gauge, but, paste foil gauge and inherently belong to contact type measurement, and can only test sample be certain a bit or strain value of some point, there is significant limitation.In addition, Digital Speckle Correlation Method has also been introduced in the test of Dynamic Fracture experiment by someone, strain and the displacement of specimen surface can be measured by digital speckle method, but due to the problem of data processing software, can not well process at the spreading rate of the sample crack surfaces at fault line place.A wordline laser is utilized to irradiate crackle, make laser rays and crack planes perpendicular, in crack propagation process, the surperficial distance of two, crackle constantly changes, the luminous flux of the laser therefore passed through also can change thereupon, thus can record the spreading rate of crackle by the rate of change measuring luminous flux.
Can find from existing research, the research for the spreading rate of fatigue crack is more, but is not a lot of for the research of the spreading rate of crackle high-speed expansion, and method is all comparatively complicated.Utilize in the document of the opening displacement of laser measurement crackle and can find, the equipment of its application has significant limitation, because the amount by crackle of laser is little, in measuring process, is therefore easy to the interference being subject to ambient light photograph.In addition, for large sample, in sample destructive process, the propagation of crackle is very large, therefore needs the line laser that length is longer.Meanwhile, if measure process in the difference such as crackle form and flaw angle, a lot of inconvenience is brought to measurement.These problems are all urgently to be resolved hurrily above.
Summary of the invention
The object of the invention is to utilize adjustable wordline laser and photoelectric receiving arrangement to measure Dynamic Crack Propagation speed, and by regulating the intensity of laser, and the live width of laser, realize the mensuration to the dynamic expansion speed of the crackle of various scope, various angle under kinds of experiments condition.
The present invention adopts following technical scheme to realize the above object.
Adjustable laser crack growth rate instrument comprises: first kind guide rail bearing (two), Equations of The Second Kind guide rail bearing (one), guide rail pipe (two), line laser power governor (one), line laser transmitter (), first kind slide block (two), Equations of The Second Kind slide block (one), the convex lens (one group) of different focal, photoelectric receiving arrangement (), height regulating rod (some).
Below the effect of each ingredient of adjustable laser crack growth rate instrument is described.
Two described first kind guide rail bearings, an Equations of The Second Kind guide rail bearing, two guide rail pipes, two first kind slide blocks and Equations of The Second Kind slide block together constitute the guide rail of adjustable laser crack growth rate instrument.
Two first kind guide rail bearings bear the task of static line laser power regulator simultaneously.
Two first kind slide blocks play the supporting role of the convex lens of line laser transmitter and different focal respectively, and can make it at slide on rails.
Equations of The Second Kind slide block is used for supporting photoelectric receiving arrangement, and it can be made at slide on rails.
Line laser power governor and line laser transmitter together constitute the line laser emission coefficient of adjustable laser crack growth rate instrument.
The power of the laser of laser transmitter projects can control in the scope of 0mW-10mW by line laser power governor;
The wavelength of the laser of laser transmitter projects is 650nm, and light emitting anger is 10 °.
The focal length of convex lens is respectively 10cm, 15cm, 20cm, 25cm.
Containing photodiode in photoelectric receiving arrangement, wherein the spectrum respective range of photodiode is 400-1000nm, and photoelectric receiving arrangement response frequency reaches 1MHz.
Described adjustable laser crack growth rate instrument realizes the measurement to the dynamic expansion speed of crackle by following steps.
Step one: according to be measured containing precracked specimen size and the convex lens estimating choose reasonable respective focal to the final extension width of crackle.
Step 2: convex lens are arranged on corresponding first kind slide block.
Step 3: according to the distance of the opinion of the rule reasonable adjusting convex lens on guide rail and generating laser light hole, ensure that the center of the bright dipping of line laser transmitter is at the focus place of convex lens, thus the light obtained after laser light convex lens is directional light.
Step 4: adjustable laser crack growth rate instrument is placed in be measured containing the rational position around precracked specimen, regulates the height of line laser transmitter, convex lens, photoelectricity receiving device, ensure that it is coaxial.
Step 5: the switch opening line laser power governor, the light intensity experimentally needed for condition adjustment, observe the line laser sent, the line laser that rotational line generating laser makes it send is vertical with fault line simultaneously.
Step 6: the external data line of photoelectric receiving arrangement is received on an oscillograph.
Complete above step, and ensure the correctness of operation, just can test, in experimentation, the spreading rate of crackle can be recorded by adjustable laser crack growth rate instrument.
The present invention adopts above technical scheme, by regulating the light intensity of line laser, and coordinate the convex lens of different focal, can the energy of easier adjustment unit line laser length laser, thus the mensuration of the Dynamic Crack Propagation speed under kinds of experiments condition can be realized.By regulating the angle of line laser transmitter, the mensuration of multi-angle Dynamic Crack Propagation speed can be realized.The mensuration of the Dynamic Crack Propagation speed containing precracked specimen of various sizes can be realized by the focal length of the convex lens using different focal.By the mensuration regulating the height of line laser transmitter, convex lens and optoelectronic receiver can measure the Dynamic Crack Propagation speed containing precracked specimen of different installation situation.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram of adjustable laser crack growth rate registering instrument of the present invention, comprise as shown in the figure: first kind guide rail bearing (two), Equations of The Second Kind guide rail bearing (one), guide rail pipe (two), line laser power governor (one), line laser transmitter (one), line laser transmitter support (one), first kind slide block (two), Equations of The Second Kind slide block (one), the convex lens (a group) of different focal, convex lens support (), photoelectric receiving arrangement (one), height regulating rod (some).
Fig. 2 is the schematic diagram of first kind guide rail bearing.
Fig. 3 is the schematic diagram of Equations of The Second Kind guide rail bearing.
Fig. 4 is guide rail pipe schematic diagram.
Fig. 5 is first kind slide block schematic diagram.
Fig. 6 is Equations of The Second Kind slide block schematic diagram.
Fig. 7 is line laser power governor schematic diagram.
Fig. 8 is line laser transmitter schematic diagram.
Fig. 9 is laser line generator transmitter rack schematic diagram.
Figure 10 is convex lens support schematic diagram.
Figure 11 is photoelectric receiving arrangement schematic diagram.
Figure 12 height regulating rod schematic diagram.
Embodiment
In order to clearly set forth equipment characteristic of the present invention, technological merit and concrete using method, below in conjunction with accompanying drawing, the assembling of adjustable laser crack growth rate registering instrument and using method are specifically described.
Assembling for adjustable laser crack growth rate registering instrument needs correctly to install in strict accordance with the position of each parts shown in Fig. 1, and the rational position is in FIG carried out fastening with the bolt of corresponding size.In label 1 in Fig. 2, Fig. 3, the label 1 in label 1, Fig. 5 and the through hole shown in label 1 in figure six are used to the horizontal level of the guide rail pipe shown in location map 4.The countersunk head threaded hole shown in label 2 in label 2 in Fig. 2 and Fig. 3 is used to the position coordinating fixed guide pipe and the first kind and Equations of The Second Kind guide rail bearing with corresponding bolt, makes it can not relative motion.The threaded hole shown in label 3 in Fig. 2 is used to corresponding bolt and coordinates static line laser power regulator, makes it can be fixed on guide rail.Label 3 in Fig. 5 and the threaded hole shown in label 3 in Fig. 6 coordinate with corresponding bolt can fix first kind slide block and the position of Equations of The Second Kind slide block on guide rail.Label in Fig. 54 makes the height regulating rod shown in Figure 12 pass wherein with the square unthreaded hole shown in label 4 in Fig. 6, and to be coordinated the height adjusting the relative and guide rail of height regulating rod with corresponding bolt by the label 2 in Fig. 5 and the label 2 in Fig. 6.The threaded hole 2 of the laser line generator transmitter rack shown in Fig. 9, the threaded hole 2 of the convex lens support shown in Figure 10 and the threaded hole 1 of the photoelectric receiving arrangement shown in Figure 11 are connected with the external thread of corresponding height regulating rod respectively, by adjusting the height of height regulating rod thus reaching the object of height of adjustment generating laser, convex lens, photoelectric receiving arrangement.The threaded hole 2 of the height regulating rod shown in Figure 12 has identical diameter with the external thread 1 of height regulating rod, can cooperatively interact, if the length of height regulating rod falls short of, longer height regulating rod can be connected to form with many height regulating rods, thus reach test purpose.
The following detailed description of the regulative mode of adjustable laser crack growth rate registering instrument.
The light emitting anger of line laser transmitter is 10 ° as previously described, therefore according to the ABC that light is propagated, the travel path of laser with the distance of line laser transmitter light hole is
sposition, the width of line laser is
l.From formula, when
sduring=10cm,
l=1.743cm; When
sduring=15cm,
l=2.615cm; When
sduring=20cm,
l=3.49cm; When
swhen=25,
l=4.36cm.The focal length of the focal length convex lens of convex lens is respectively
f 1 =10cm,
f 2 =15cm,
f 3 =20cm,
f 4 =25cm, in experimentation, selects suitable convex lens, and is the focus place being centrally located at convex lens of the light hole of line laser transmitter, will obtain the line laser of different in width.The power of the laser of laser transmitter projects can control in the scope of 0mW-10mW by line laser power governor, therefore in order to adapt to the experiment under various condition, can select the intensity of line laser according to actual conditions and coordinate the convex lens of different focal.Such as, the intensity of line laser is transferred to maximum, simultaneously with the use of
f 1 the convex lens of=10cm, so just can obtain the line laser of largest light intensity in unit length.In like manner, the line laser of multiple intensity, multiple width can be obtained.So just bring great convenience to experiment, and the impact of testing by external environment drops to minimum.
Because the experimental facilities used for the loading experiment containing precracked specimen is had nothing in common with each other, therefore the dirigibility for surveying instrument proposes very large challenge, and the present invention applies method that some height regulating rods are connected cleverly and achieves adjustment to generating laser, convex lens, photoelectric receiving arrangement height.And different due to crackle and horizontal level angle in experiment, the line laser that can be sent by adjustment generating laser and the angle of surface level, make that line laser is vertical with fault line reaches measurement requirement.In specific experiment, make to be measured being placed between convex lens and photoelectric receiving arrangement containing precracked specimen, and ensure that line laser can receive through crackle and by photoelectric receiving arrangement in experimentation, then tests.In experimentation, utilize adjustable laser crack growth rate instrument can obtain Dynamic Crack Propagation situation bottom offset
uin time
tthe curve of change.According to the relation between speed and displacement, the dynamic expansion speed of crackle in each moment can be obtained
vcan by formula
v=du/dtrepresent.According to dynamic expansion speed
vexpression formula coding, and be implanted in oscillograph, just can realize the object of the measurement to Dynamic Crack Propagation speed.
To sum up, under the present invention achieves multiple condition by the adjustment of the height of the line laser that sends line laser intensity, generating laser and the angle of surface level, the focal length of convex lens and each parts, the mensuration of multi-angle, on a large scale Dynamic Crack Propagation speed.
Claims (3)
1. adjustable laser crack growth rate registering instrument, it is characterized in that: first kind guide rail bearing (two), Equations of The Second Kind guide rail bearing (one), guide rail pipe (two), line laser power governor (), line laser transmitter (one), first kind slide block (two), Equations of The Second Kind slide block (), the convex lens (a group) of different focal, photoelectric receiving arrangement (one), height regulating rod (some).
2. the power passing through adjustment line laser and the convex lens applying multiple focal length obtain many intensity, the line laser of many width, thus realize the mensuration to the dynamic expansion speed of the crackle of various working environments, sizes.
3. by the structure of appropriate design adjustable laser crack growth rate registering instrument, the line laser regulating generating laser to send and the angle of surface level, and regulate the height of all parts to realize the mensuration of the dynamic expansion speed of the crackle loaded based on plurality of devices by height regulating rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410603305.1A CN104297158A (en) | 2014-11-01 | 2014-11-01 | Adjustable laser crack growth rate recording meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410603305.1A CN104297158A (en) | 2014-11-01 | 2014-11-01 | Adjustable laser crack growth rate recording meter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106871800A (en) * | 2017-01-11 | 2017-06-20 | 合肥工业大学 | A kind of photoelectric diameter measurement system |
| CN107402151A (en) * | 2017-07-31 | 2017-11-28 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of method that control brittle material surface and through-wall crack size is motivated by ultrasound |
| CN108613872A (en) * | 2018-06-13 | 2018-10-02 | 山东科技大学 | Transparent rocks test specimen crack propagation monitors system and method |
| CN108831245A (en) * | 2018-06-27 | 2018-11-16 | 张鹏 | A kind of adjustable teaching indicator of luminous point |
-
2014
- 2014-11-01 CN CN201410603305.1A patent/CN104297158A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106871800A (en) * | 2017-01-11 | 2017-06-20 | 合肥工业大学 | A kind of photoelectric diameter measurement system |
| CN107402151A (en) * | 2017-07-31 | 2017-11-28 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of method that control brittle material surface and through-wall crack size is motivated by ultrasound |
| CN107402151B (en) * | 2017-07-31 | 2020-06-05 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for controlling size of surface and through crack of brittle material by ultrasonic excitation |
| CN108613872A (en) * | 2018-06-13 | 2018-10-02 | 山东科技大学 | Transparent rocks test specimen crack propagation monitors system and method |
| CN108613872B (en) * | 2018-06-13 | 2019-03-12 | 山东科技大学 | Transparent rocks test specimen crack propagation monitors system and method |
| CN108831245A (en) * | 2018-06-27 | 2018-11-16 | 张鹏 | A kind of adjustable teaching indicator of luminous point |
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Application publication date: 20150121 |
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