CN109884125A - A kind of caliberating device and scaling method based on DCPD method crack propagation signal - Google Patents
A kind of caliberating device and scaling method based on DCPD method crack propagation signal Download PDFInfo
- Publication number
- CN109884125A CN109884125A CN201910134575.5A CN201910134575A CN109884125A CN 109884125 A CN109884125 A CN 109884125A CN 201910134575 A CN201910134575 A CN 201910134575A CN 109884125 A CN109884125 A CN 109884125A
- Authority
- CN
- China
- Prior art keywords
- crack
- liquid metal
- cavity
- signal
- crack propagation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a kind of caliberating devices and scaling method based on DCPD method crack propagation signal, caliberating device includes cavity, cavity base and Plastic section, the top of cavity base is arranged in cavity, cavity shape is rectangular parallelepiped structure, the cavity that the cavity wall of cavity surrounds is rectangular intracoelomic cavity, and the middle part of antetheca and rear wall, which is vertically arranged, to be had the gap, and the two sides in gap are provided with scale along its length, liquid metal is full of in rectangular intracoelomic cavity, Plastic section can be inserted into gap internal cutting liquid metal.The present invention is in a liquid state at normal temperature using liquid metal and the performance with certain fluidity, by liquid metal cutting can intuitive, image simulating crack extension the case where, for research and develop based on DCPD method crack monitoring instrument provide it is a kind of can the simulating crack of Reusability and directly perceived characterization extend the method for signal, have the advantages that performance is stablized and can be operated repeatedly, greatly reduces the manufacturing cost based on DCPD method crack monitoring instrument.
Description
Technical field
The invention belongs to nuclear power structure safety analysis technique fields, are believed more particularly, to one kind based on DCPD method crack propagation
Number caliberating device and scaling method.
Background technique
In nuclear power field, chief part is in high temperature and pressure water environment, due to stress corrosion at welding point
It is easy to produce crackle, monitoring crack length and to evaluate the machine components service life be to save nuclear power cost, reduce Nuclear Safety accident hair
Raw important research technical field.At abroad, MTS company has developed the crackle measuring system based on DCPD (direct current potential drop) method
It is measured for crack Propagation, MATELECT company has developed a kind of monitoring crack growth instrument use using pulse direct current technology
The test button crack propagation in monitoring mechanical test.But due to technical know-how etc., these external test equipment technologies
It is relatively fewer to introduce data.Although also there is correlative study in the country but due to history, the country is in desk-top high-acruracy survey instrument
It has a long way to go in terms of device with world level, market is still monopolized by the foreign well-knowns manufacturer such as An Jielun, Tyke at present, instrument price
Height causes crackle measuring system cost high.For technology blockage of breaking up monopoly, the price of pertinent instruments is reduced, realizes instrument
The production domesticization of device, research and development integrated level is high, precision is high, crack monitoring instrument at low cost is extremely important.
Currently, most of monitoring of nuclear power part crack uses DCPD (direct current potential drop) method, sample is measured with DCPD method
Crack length be substantially measure sample crackle both end voltage signal variation, when sample both ends add constant DC current
When, the voltage drop at crackle both ends is gradually increased with the growth of crackle, and the voltage signal of crack propagation is microvolt grade signal.Cause
This, needs a voltage signal conduct corresponding with actual crack length in the research and development of the crack monitoring instrument based on DCPD method
The signal source for researching and developing instrument, carrys out the extension voltage signal of On Crack Propagation length to quantify to demarcate.But due to nuclear power field
The crack growth rate of nuclear power part is very slow, then tens days short, the long then more than ten years, its experimental situation is real in instrument R&D process
The existing period is too long, signal source when being not appropriate for as research and development test equipment.Therefore, the crackle at home based on DCPD method at present
There is no obtain stable performance, Reusability and effective crack propagation signal to quantify to demarcate for the development of monitoring instrument.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art described above, a kind of crack propagation based on DCPD method is provided
Signal scaling device, the development for the domestic crack monitoring instrument based on DCPD method provide effective crack propagation signal
Quantization calibration, has the advantages that fracture stimulations are visual in image, performance is stable, repeatedly used, greatly reduces based on DCPD method
The manufacturing cost of crack monitoring instrument.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of mark based on DCPD method crack propagation signal
Determine device, it is characterised in that: including cavity, cavity base and Plastic section, the top of cavity base, institute is arranged in the cavity
The shape for stating cavity is rectangular parallelepiped structure, and the cavity is made of antetheca, rear wall, left wall, right wall and bottom wall, the antetheca, after
The cavity that wall, left wall, right wall and bottom wall surround is rectangular intracoelomic cavity, liquid metal is full of in the rectangular intracoelomic cavity, before described
The middle part of wall and rear wall, which is vertically arranged, to be had the gap, and the gap on the antetheca and rear wall is symmetrical, two lateral edges in the gap
Length direction is provided with scale, and the Plastic section inserted into gap is interior and for cutting liquid metal, the Plastic section
Thickness is equal with the width in gap, and the length of the Plastic section is greater than the height of rectangular intracoelomic cavity, the width of the Plastic section
Degree is greater than the width of rectangular intracoelomic cavity.
Above-mentioned a kind of caliberating device based on DCPD method crack propagation signal, it is characterised in that: the caliberating device is answered
Calibration for crack monitoring instrument to the crack propagation signal of 304 steel curved beams, the crack monitoring instrument are based on DCPD method
Crack monitoring instrument.
A kind of above-mentioned caliberating device based on DCPD method crack propagation signal, it is characterised in that: the length of the cavity
L1 is 20mm, width W1 is 12mm, height H1 is 20mm, the length L2 of the rectangular intracoelomic cavity is 16mm, width W2 be 10mm,
Height H2 is 18mm.
A kind of above-mentioned caliberating device based on DCPD method crack propagation signal, it is characterised in that: the width in the gap
For 0.3mm, the length of the Plastic section is 20mm, width 12mm, with a thickness of 0.3mm.
Above-mentioned a kind of caliberating device based on DCPD method crack propagation signal, it is characterised in that: the liquid metal is
Gallium kirsite liquid metal.
Above-mentioned a kind of caliberating device based on DCPD method crack propagation signal, it is characterised in that: the liquid metal
Volume is 2.88 milliliters.
A kind of above-mentioned caliberating device based on DCPD method crack propagation signal, it is characterised in that: the gallium zinc liquid
The quality of gallium metal and the mass ratio of zinc metal are 3:1 in state metal.
The present invention also provides a kind of scaling method carried out using above-mentioned apparatus based on DCPD method crack propagation signal,
It is characterized in that, method includes the following steps:
Step 1: at room temperature, liquid metal is injected into rectangular intracoelomic cavity with needle tubing, so that liquid metal is full of whole
A rectangular intracoelomic cavity；
Step 2: the current signal output end connecting line of the crack monitoring instrument based on DCPD method is inserted along on the inside of antetheca
Enter in liquid metal, the voltage signal acquisition end connecting line of the crack monitoring instrument based on DCPD method is inserted along the inside of antetheca
Enter in liquid metal, the input current value of liquid metal is set on the crack monitoring instrument based on DCPD method as 0.1A；
Step 3: the voltage output signal that the crack monitoring instrument based on DCPD method acquired and saved liquid metal is V0；
Step 4: liquid metal is cut downwards using Plastic section along gap and according to the scale that gap two sides identify,
Scale is incremented by from top to bottom, stops cutting when cutting to 1mm and keeps the position of Plastic section constant, so that liquid metal produces
The shape of raw simulating crack extension；
Step 5: the crack monitoring instrument based on DCPD method acquires and to save voltage of the liquid metal when cutting 1mm defeated
Signal is V out1；
Step 6: the experimental verification of finite element model analysis and liquid metal based on 304 steel curved beams, obtains liquid metal
Relationship between the voltage signal and 304 steel curved beam crack propagation signals under cut state are as follows: when input current is 0.1A,
Liquid metal cutting dmm can simulate the crack propagation signal of the 304 steel curved beam crack growth dmm when input current is 1A, by
It is 1mm in the Cutting Length difference of collection voltages output signal twice, the voltage acquired twice according to above relationship is believed
Number difference DELTA V=V1-V0The crack propagation signal of 304 steel curved beam crack growth 1mm of analog, therefore will be based on DCPD method
The Δ V signal of crack monitoring instrument acquisition is demarcated as crack propagation when 304 steel curved beam input currents are 1A, crack propagation 1mm
Signal；
Step 7: set the cutting increment of liquid metal as 1mm, step 4 and step 5 are repeated and by collected electricity
Pressure signal and the voltage signal of step 3 acquisition seek difference, according to the known relationship conclusion in step 6 come to different 304
The extension signal of the crack extending length of steel curved beam is demarcated, when completion crack extending length is the crack propagation signal of 5mm
Calibration when, the crack propagation signal scaling of the crack monitoring instrument based on DCPD method terminates.
Compared with the prior art, the present invention has the following advantages:
1, caliberating device structure of the invention is simple, is in a liquid state at normal temperature using liquid metal and has certain flowing
Property performance, after liquid metal is cut can intuitive, image simulating crack extension the case where, be that research and development are based on DCPD method crackle
Monitoring instrument provide it is a kind of can Reusability and directly perceived characterization simulating crack extension signal method, and as cavity stitches
The unlimited lengthening of gap, the simulating crack extension that the method can be limitless, therefore accelerate the period of instrument research and development.
2, surface layer can produce layer oxide film to liquid metal of the invention at room temperature, between this oxidation film and Plastic section
It does not adhere, therefore the conductive continuity of the liquid metal close to cavity wall inner wall is effectively guaranteed, so that liquid metal is around modeling
The distribution of material slice simultaneously generates potential difference along the direction of simulating crack extension, successfully simulates the crack propagation feelings based on DCPD method
Condition.
3, the present invention intends crack propagation situation using Plastic section cutting liquid metal mold, feasibility is strong, it is easy to operate simultaneously
It can operate repeatedly, solve the problems, such as that the actual metal sample crack propagation period is long and it is destructive to have, experiment consumptive material is big, save
The experimental study cost of research and development crack monitoring instruments.
4, the present invention can be by changing the multiple parameters such as the thickness of liquid metal, the width of cutting gap come simulating crack expansion
Situation is opened up, more accurate voltage change signal, the overall process of more preferable simulation various sample crack propagation can be effectively chosen.
Below by drawings and examples, the present invention is described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of caliberating device of the present invention.
Fig. 2 is the longitudinal sectional drawing of caliberating device of the present invention.
The top view of the position Fig. 3 caliberating device of the present invention.
Fig. 4 is the connection relationship diagram of caliberating device cavity and cavity base of the present invention.
Fig. 5 is the fall-of-potential method schematic diagram that sample of the present invention does not contain crackle.
Fig. 6 is the fall-of-potential method schematic diagram that sample of the present invention contains crackle.
Fig. 7 is the crack propagation figure of sample of the present invention.
Fig. 8 is the graph of relation of liquid metal crack growth amount and potential drop of the present invention.
Fig. 9 is the finite element model figure of 304 steel curved beams of the invention.
Figure 10 is the finite element result figure of 304 steel curved beams of the invention.
Figure 11 is the crack growth amount of 304 steel curved beams and the curve graph of potential drop of the invention.
Figure 12 is caliberating device of the present invention and the connection relationship diagram based on DCPD method crack monitoring instrument.
Description of symbols:
1-rectangular intracoelomic cavity；2-gaps；3-cavitys；
4-cavity bases；5-Plastic sections；6-liquid metals.
Specific embodiment
The principle of the DCPD applied in crack monitoring instrument based on DCPD (direct current potential drop) method are as follows: fall-of-potential method is base
In the conductive characteristic of metal material itself come the method that measures crack length.As shown in Figure 5 and Figure 6, on containing precracked specimen, electricity
Flow field is specimen geometry, especially the function of crack size, and when passing through constant current in sample, potential can be in sample
The increase of crack length and increase.For fall-of-potential method with generally being implemented with four probe method, two probe of outside (C1, C2) is electric current electricity
Pole, for exciting current I from two probe of outside by tested sample, two probe of inside (P1, P2) is voltage V (potential difference) electrode, electricity
Potential difference depends on the distribution of electric current in sample.
The present invention in order to determine relationship between voltage signal and crack propagation signal under liquid metal difference Cutting Length,
Carry out following working contents:
One, the establishment foundation of scaling method
The extension of crackle is exactly material defects to the eye, and air enters test button, when being passed through electric current, due to
The air insulation of entrance, using liquid metal, utilizes the flowing of liquid so that the potential drop of test button changes
Property, serving as air insulation using Plastic section acts on, as shown in fig. 7, the crack propagation of sample will be presented in liquid metal, thus
Intend the extension of crackle by cutting liquid metal mold, it is no matter from principle or intuitively very simple clear, it can help non-special
Industry personage more fully understands this analogy method.
In conjunction with crack propagation mechanism, the crack propagation using DCPD method is simulated using liquid metal, compares other simulations
Method, more intuitive and stable, the acquisition of signal is more accurate.Since liquid metal surface layer will form thin film at room temperature,
Come to ensure that the leakproofness i.e. liquid metal of device will not flow out from reserved slice gap, Plastic section initial cut
Liquid metal can make liquid metal generate the gap with Plastic section condition of equivalent thickness, with the intensification of slice depth of cut, gap
It can gradually lengthen, when Plastic section continuously cuts liquid metal, liquid metal can bypass Plastic section, to reach and reality
The identical effect of crack growth.
Two, the finite element model analysis of 304 steel curved beams
Choosing most common 304 steel in metal parts is sample to carry out finite element model analysis, determines 304 steel crackles
Relationship between extension length and crack propagation signal；
(1) as shown in figure 9, establishing the finite element model of 304 steel curved beams；
(2) the associated materials attribute of 304 steel curved beam finite element models of setting, Conductivity=0.19w/ (mm),
Electrical conductivity=26100/ Ω mm, Joule heat fraction=1；
(3) assembling model；
(4) analysis step is created, type is General:Couple thermal-electric, defines initial gain amount and most
Big increment is 0.1；
(5) boundary condition, electric current 1A and environment temperature field in input set are created；
(6) grid division, Element types are DC3D8E unit；
(7) it submits operation and checks as a result, wherein the finite element result of 304 steel curved beams is as shown in Figure 10,304 steel curved beams
The curve of crack growth amount and potential drop is as shown in figure 11.
Three, liquid metal cutting experiment
(1) experimental situation temperature is 25 DEG C, the liquid metal of gallium kirsite is injected into inner cavity with needle tubing, by Deco skill
Constant-current source electric current output lead along cavity 3 antetheca on the inside of insertion liquid metal in, by the letter of the nanovoltmeter of Deco skill
Number acquisition connecting line is along in insertion liquid metal, setting the output current value of constant-current source as 1A, constant current on the inside of the antetheca of cavity 3
The output voltage values in source are 6.6 μ V, and it is 6.6 μ V that nanovoltmeter, which measures original state,；
(2) the use of length is 20mm, width be 12mm and with a thickness of 0.3mm Plastic section from cavity top end along gap
Liquid metal is cut downwards according to the scale of mark and scale is incremented by from top to bottom, in order to protect with the crack propagation increment in Figure 11
It holds consistent and in order to more accurately depict simulating crack propagation and voltage drop variation relation figure, sets liquid metal
Cutting incremental change is 0.5mm, and every cutting 0.5mm is using nanovoltmeter successively collection voltages signal, when having acquired cutting-in as the liquid of 5mm
After the voltage signal of state metal, end of data is acquired；
(3) curve graph is made in the relationship of the crack growth amount of liquid metal and voltage drop, as shown in Figure 8.
Four, the crack propagation signal of the finite element model of 304 steel curved beams and the liquid metal voltage signal of acquisition are to score
Analysis
As seen in Figure 11,304 steel crack propagations are a nonlinear propagation process, and the every extension of crackle increases
1mm, corresponding voltage value added is not identical, i.e.,
ΔU21≠ΔU22≠ΔU23……≠ΔU2n
Wherein Δ U21The crack propagation signal value of 1mm, Δ U are expanded to from 0mm for 304 steel curved beam crackles2nFor the examination of 304 steel
Sample crackle expands to the crack propagation signal value of n mm from (n-1) mm；
As seen in Figure 8, the crack propagation of liquid metal simulation is also a nonlinear propagation process, that is, is cut
The every growth 1mm of length, corresponding voltage value added is not also identical, i.e.,
ΔU11≠ΔU12≠ΔU13……≠ΔU1n
Wherein Δ U11The crack propagation signal value of 1mm, Δ U are expanded to from 0mm for liquid metal simulating crack1nFor liquid
Metal simulating crack expands to the crack propagation signal value of n mm from (n-1) mm；
For the crack propagation of unit length, the incrementss Δ U of potential drop in liquid metal simulating crack expansion process11With
The incrementss Δ U of potential drop in 304 steel curved beam crack propagation processes21Though it is not identical, there are certain proportionate relationship, and ratio
Coefficient is identical, by Ohm's law, adjusts the value of initial current, available identical potential drop value added uses mathematical formulae
Expression are as follows:
ΔU11=K Δ U21
ΔU12=K Δ U22
......
ΔU1n=K Δ U2n
As shown in Figure 11, when to be passed through electric current be 1A, the signal of its crack propagation becomes when the crack growth 1mm of 304 steel curved beams
Turn to 0.5 μ V；As shown in Figure 8, when to be passed through electric current be 1A, its voltage change is 5uV when the cutting-in 1mm of liquid metal, then releases:
ΔU11=10 Δ U21
By Ohm's law it is found that when adjusting initial current is 0.1A, the initial voltage variation Δ U of liquid metal11For
0.5uV, this and 304 steel curved beam crack propagation initial voltage Δ U21It is identical, the voltage drop proving by the same methods of other sections: Δ U1n=
10·ΔU2n, i.e., only need to be 0.1A by current regulation before experiment, so that it may simulate splitting for 304 steel curved beams completely with liquid metal
Line extends actual conditions.
Five, conclusion
The voltage signal when cutting-in of cutting liquid metal is dmm, input current is 0.1A can be used as 304 steel curved beams and split
Simulating crack when line extends dmm, electric current input 1A extends signal.
As Figure 1-Figure 4, using relationship determined above to the crack propagation of the crack monitoring instrument based on DCPD method
Cavity base 4 is arranged in the caliberating device of signal scaling, including cavity 3, cavity base 4 and Plastic section 5, the cavity 3
The shape at top, the cavity 3 is rectangular parallelepiped structure, and the cavity 3 is made of antetheca, rear wall, left wall, right wall and bottom wall, institute
Stating the cavity that antetheca, rear wall, left wall, right wall and bottom wall surround is rectangular intracoelomic cavity 1, is full of liquid in the rectangular intracoelomic cavity 1
The middle part of metal 6, the antetheca and rear wall, which is vertically arranged, has the gap 2, and the gap 2 on the antetheca and rear wall is symmetrical, institute
The two sides for stating gap 2 are provided with scale along its length, and 5 inserted into gap 2 of Plastic section is interior and for cutting liquid gold
Belong to 6, the thickness of the Plastic section 5 is equal with the width in gap 2, and the length of the Plastic section 5 is greater than rectangular intracoelomic cavity 1
Highly, the width of the Plastic section 5 is greater than the width of rectangular intracoelomic cavity 1.
In the present embodiment, the caliberating device is applied to crack monitoring instrument to the crack propagation signals of 304 steel curved beams
Calibration, the crack monitoring instrument are the crack monitoring instrument based on DCPD method.
In the present embodiment, the length L1 of the cavity 3 is 20mm, width W1 is 12mm, height H1 is 20mm, described rectangular
The length L2 of intracoelomic cavity 1 is 16mm, width W2 is 10mm, height H2 is 18mm.
In the present embodiment, the width in the gap 2 is 0.3mm, and the length of the Plastic section 5 is 20mm, width is
12mm, with a thickness of 0.3mm.
In the present embodiment, the liquid metal 6 is gallium kirsite liquid metal.
In the present embodiment, the volume of the liquid metal 6 is 2.88 milliliters.
In the present embodiment, the quality of gallium metal and the mass ratio of zinc metal are 3:1 in the gallium kirsite liquid metal.
Scaling method based on DCPD method crack propagation signal the following steps are included:
Step 1: at room temperature, liquid metal 6 is injected into rectangular intracoelomic cavity 1 with needle tubing, so that liquid metal 6 fills
Full entire rectangular intracoelomic cavity 1；
Step 2: as shown in figure 12, by the current signal output end connecting line edge of the crack monitoring instrument based on DCPD method
On the inside of antetheca in insertion liquid metal 6, by the voltage signal acquisition end connecting line edge of the crack monitoring instrument based on DCPD method
Antetheca inside insertion liquid metal 6 in, on the crack monitoring instrument based on DCPD method set liquid metal 6 input electricity
Flow valuve is 0.1A；
Step 3: the voltage output signal that the crack monitoring instrument based on DCPD method acquired and saved liquid metal 6 is V0；
Step 4: cutting liquid gold downwards using Plastic section 5 along gap 2 and according to the scale that 2 two sides of gap identify
Belong to 6, scale is incremented by from top to bottom, stops cutting when cutting to 1mm and keeps the position of Plastic section 5 constant, so that liquid
Metal 6 generates the shape of simulating crack extension；
Step 5: the crack monitoring instrument based on DCPD method acquires and to save voltage of the liquid metal 6 when cutting 1mm defeated
Signal is V out1；
Step 6: the experimental verification of finite element model analysis and liquid metal 6 based on 304 steel curved beams, obtains liquid gold
Belong to 6 relationship between the voltage signal and 304 steel curved beam crack propagation signals under cut state are as follows: when input current is 0.1A
When, liquid metal 6, which cuts d mm, can simulate the crack propagation letter of the 304 steel curved beam crack growth d mm when input current is 1A
Number, since the Cutting Length difference of collection voltages output signal twice is 1mm, the electricity acquired twice according to above relationship
Press the difference DELTA V=V of signal1-V0The crack propagation signal of 304 steel curved beam crack growth 1mm of analog, therefore DCPD will be based on
The Δ V signal of the crack monitoring instrument acquisition of method is demarcated as crackle when 304 steel curved beam input currents are 1A, crack propagation 1mm
Extend signal；
Step 7: the cutting increment for setting liquid metal 6 as 1mm, repeats step 4 and step 5 and will be collected
Voltage signal and the voltage signal of step 3 acquisition seek difference, according to the known relationship conclusion in step 6 come to different
The extension signal of the crack extending length of 304 steel curved beams is demarcated, and is believed when completing the crack propagation that crack extending length is 5mm
Number calibration when, the crack propagation signal scaling of the crack monitoring instrument based on DCPD method terminates.
In general, the service life of 304 steel is just unable to satisfy engine request after the crack growth 5mm of 304 steel, because
This signal for monitoring crack extension meets requirement of engineering.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification, change and equivalent structure transformation to the above embodiments, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (8)
1. a kind of caliberating device based on DCPD method crack propagation signal, it is characterised in that: including cavity (3), cavity base (4)
With Plastic section (5), cavity (3) setting is cuboid knot in the top of cavity base (4), the shape of the cavity (3)
Structure, the cavity (3) are made of antetheca, rear wall, left wall, right wall and bottom wall, and the antetheca, rear wall, left wall, right wall and bottom wall enclose
At cavity be rectangular intracoelomic cavity (1), liquid metal (6) are full of in the rectangular intracoelomic cavity (1), in the antetheca and rear wall
Portion, which is vertically arranged, to be had the gap (2), and the gap (2) on the antetheca and rear wall is symmetrical, two lateral edge length of the gap (2)
Direction is provided with scale, and Plastic section (5) inserted into gap (2) is interior and for cutting liquid metal (6), and the plastics are cut
The thickness of piece (5) is equal with the width of gap (2), and the length of the Plastic section (5) is greater than the height of rectangular intracoelomic cavity (1),
The width of the Plastic section (5) is greater than the width of rectangular intracoelomic cavity (1).
2. a kind of caliberating device based on DCPD method crack propagation signal described in accordance with the claim 1, it is characterised in that: described
Caliberating device is applied to calibration of the crack monitoring instrument to the crack propagation signal of 304 steel curved beams, and the crack monitoring instrument is
Crack monitoring instrument based on DCPD method.
3. a kind of caliberating device based on DCPD method crack propagation signal according to claim 2, it is characterised in that: described
The length L1 of cavity (3) is 20mm, width W1 is 12mm, height H1 is 20mm, and the length L2 of the rectangular intracoelomic cavity (1) is
16mm, width W2 are 10mm, height H2 is 18mm.
4. a kind of caliberating device based on DCPD method crack propagation signal described in accordance with the claim 3, it is characterised in that: described
The width in gap (2) is 0.3mm, the length of the Plastic section (5) is 20mm, width 12mm, with a thickness of 0.3mm.
5. a kind of caliberating device based on DCPD method crack propagation signal according to claim 4, it is characterised in that: described
Liquid metal (6) is gallium kirsite liquid metal.
6. a kind of caliberating device based on DCPD method crack propagation signal according to claim 5, it is characterised in that: described
The volume of liquid metal (6) is 2.88 milliliters.
7. a kind of caliberating device based on DCPD method crack propagation signal according to claim 5, it is characterised in that: described
The quality of gallium metal and the mass ratio of zinc metal are 3:1 in gallium kirsite liquid metal.
8. a kind of scaling method carried out using device as claimed in claim 7 based on DCPD method crack propagation signal, feature
It is, method includes the following steps:
Step 1: at room temperature, liquid metal (6) is injected into rectangular intracoelomic cavity (1) with needle tubing, so that liquid metal (6)
Full of entire rectangular intracoelomic cavity (1)；
Step 2: by the current signal output end connecting line of the crack monitoring instrument based on DCPD method along insertion liquid on the inside of antetheca
In state metal (6), the voltage signal acquisition end connecting line of the crack monitoring instrument based on DCPD method is inserted along the inside of antetheca
Enter in liquid metal (6), set on the crack monitoring instrument based on DCPD method the input current value of liquid metal (6) as
0.1A；
Step 3: the voltage output signal that the crack monitoring instrument based on DCPD method acquired and saved liquid metal (6) is V0；
Step 4: cutting liquid downwards using Plastic section (5) along gap (2) and according to the scale that gap (2) two sides identify
Metal (6), scale is incremented by from top to bottom, stops cutting when cutting to 1mm and keeps the position of Plastic section (5) constant, makes
Obtain the shape that liquid metal (6) generate simulating crack extension；
Step 5: the crack monitoring instrument based on DCPD method acquires and saves voltage output of the liquid metal (6) when cutting 1mm
Signal is V1；
Step 6: the experimental verification of finite element model analysis and liquid metal (6) based on 304 steel curved beams, obtains liquid metal
(6) relationship between the voltage signal and 304 steel curved beam crack propagation signals under cut state are as follows: when input current is 0.1A
When, liquid metal (6) cutting d mm can simulate the crack propagation of the 304 steel curved beam crack growth d mm when input current is 1A
Signal is acquired since the Cutting Length difference of collection voltages output signal twice is 1mm according to above relationship twice
The difference DELTA V=V of voltage signal1-V0The crack propagation signal of 304 steel curved beam crack growth 1mm of analog, therefore will be based on
The Δ V signal of the crack monitoring instrument acquisition of DCPD method is demarcated as when 304 steel curved beam input currents are 1A, crack propagation 1mm
Crack propagation signal；
Step 7: set the cutting increment of liquid metal (6) as 1mm, step 4 and step 5 are repeated and by collected electricity
Pressure signal and the voltage signal of step 3 acquisition seek difference, according to the known relationship conclusion in step 6 come to different 304
The extension signal of the crack extending length of steel curved beam is demarcated, when completion crack extending length is the crack propagation signal of 5mm
Calibration when, the crack propagation signal scaling of the crack monitoring instrument based on DCPD method terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134575.5A CN109884125B (en) | 2019-02-23 | 2019-02-23 | Calibration device and calibration method based on crack propagation signals of DCPD method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134575.5A CN109884125B (en) | 2019-02-23 | 2019-02-23 | Calibration device and calibration method based on crack propagation signals of DCPD method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109884125A true CN109884125A (en) | 2019-06-14 |
| CN109884125B CN109884125B (en) | 2021-08-17 |
Family
ID=66929031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910134575.5A Active CN109884125B (en) | 2019-02-23 | 2019-02-23 | Calibration device and calibration method based on crack propagation signals of DCPD method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109884125B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113065224A (en) * | 2021-03-05 | 2021-07-02 | 天津大学 | Deep sea pipeline crack propagation monitoring and reliability evaluation method based on image recognition |
| CN113533435A (en) * | 2021-06-28 | 2021-10-22 | 南京航空航天大学 | Curve crack propagation monitoring method combining potential method and replica method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281017A (en) * | 2008-05-23 | 2008-10-08 | 中国船舶重工集团公司第七二五研究所 | Automatic measuring method of large size sample face crack extending length |
| US20090132193A1 (en) * | 2007-11-20 | 2009-05-21 | Honeywell International, Inc. | Methods and apparatus for calibrating striation density models for materials |
| JP2012088093A (en) * | 2010-10-16 | 2012-05-10 | Sumitomo Kinzoku Technol Kk | Crack opening measuring instrument under high pressure gas |
| JP2014202730A (en) * | 2013-04-10 | 2014-10-27 | 新日鐵住金株式会社 | Test piece for evaluating brittle crack propagation stop characteristics and method for evaluating brittle crack propagation stop characteristics of thick steel plate |
| CN104677259A (en) * | 2015-03-11 | 2015-06-03 | 中国航空工业集团公司北京航空材料研究院 | Calibration method for measuring accuracy of high-temperature crack length through direct current potential method |
| JP2016080631A (en) * | 2014-10-21 | 2016-05-16 | 株式会社島津製作所 | Material testing machine |
| CN106372275A (en) * | 2016-08-16 | 2017-02-01 | 天津理工大学 | Correction method used for creep crack growth numerical simulation result |
| JP2017151107A (en) * | 2016-02-25 | 2017-08-31 | 三菱日立パワーシステムズ株式会社 | Crack evaluation method inside welded part using phased array method, and welded part maintenance and management method |
| CN107402158A (en) * | 2017-07-21 | 2017-11-28 | 中国科学院金属研究所 | Improve the reverse current method of direct current potential drop crack growth rate measurement accuracy |
| CN108362558A (en) * | 2017-12-13 | 2018-08-03 | 中国特种飞行器研究所 | A kind of panels with multiple site damage Crack growth analysis method based on local stress correction factor |
| JP2018159700A (en) * | 2017-03-21 | 2018-10-11 | 三菱重工業株式会社 | Miniature fracture toughness test piece and method for producing miniature fracture toughness test piece |
-
2019
- 2019-02-23 CN CN201910134575.5A patent/CN109884125B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090132193A1 (en) * | 2007-11-20 | 2009-05-21 | Honeywell International, Inc. | Methods and apparatus for calibrating striation density models for materials |
| CN101281017A (en) * | 2008-05-23 | 2008-10-08 | 中国船舶重工集团公司第七二五研究所 | Automatic measuring method of large size sample face crack extending length |
| JP2012088093A (en) * | 2010-10-16 | 2012-05-10 | Sumitomo Kinzoku Technol Kk | Crack opening measuring instrument under high pressure gas |
| JP2014202730A (en) * | 2013-04-10 | 2014-10-27 | 新日鐵住金株式会社 | Test piece for evaluating brittle crack propagation stop characteristics and method for evaluating brittle crack propagation stop characteristics of thick steel plate |
| JP2016080631A (en) * | 2014-10-21 | 2016-05-16 | 株式会社島津製作所 | Material testing machine |
| CN104677259A (en) * | 2015-03-11 | 2015-06-03 | 中国航空工业集团公司北京航空材料研究院 | Calibration method for measuring accuracy of high-temperature crack length through direct current potential method |
| JP2017151107A (en) * | 2016-02-25 | 2017-08-31 | 三菱日立パワーシステムズ株式会社 | Crack evaluation method inside welded part using phased array method, and welded part maintenance and management method |
| CN106372275A (en) * | 2016-08-16 | 2017-02-01 | 天津理工大学 | Correction method used for creep crack growth numerical simulation result |
| JP2018159700A (en) * | 2017-03-21 | 2018-10-11 | 三菱重工業株式会社 | Miniature fracture toughness test piece and method for producing miniature fracture toughness test piece |
| CN107402158A (en) * | 2017-07-21 | 2017-11-28 | 中国科学院金属研究所 | Improve the reverse current method of direct current potential drop crack growth rate measurement accuracy |
| CN108362558A (en) * | 2017-12-13 | 2018-08-03 | 中国特种飞行器研究所 | A kind of panels with multiple site damage Crack growth analysis method based on local stress correction factor |
Non-Patent Citations (2)
| Title |
|---|
| HE XUE ET AL.: ""A Monitoring System for Crack Growth Rate Based on Direct Current Potential Drop"", 《2018 INTERNATIONAL CONFERENCE ON SENSOR NETWORKS AND SIGNAL PROCESSING (SNSP)》 * |
| 杜东海 等: ""直流电压降法应力腐蚀裂纹扩展速率在线测定试验***"", 《理化检验-物理分册》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113065224A (en) * | 2021-03-05 | 2021-07-02 | 天津大学 | Deep sea pipeline crack propagation monitoring and reliability evaluation method based on image recognition |
| CN113533435A (en) * | 2021-06-28 | 2021-10-22 | 南京航空航天大学 | Curve crack propagation monitoring method combining potential method and replica method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109884125B (en) | 2021-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106443381B (en) | Dynamic arc model building method and system | |
| CN109884125A (en) | A kind of caliberating device and scaling method based on DCPD method crack propagation signal | |
| CN101672699B (en) | Electric cable conductor transient-state temperature determining method and determining device | |
| CN103411878B (en) | Method for stray current corrosion test of buried steel pipeline under tensile stress action | |
| CN102393501A (en) | MOSFET reliability test analysis system and method thereof | |
| CN101788513A (en) | Measurement device of thermal conductivity of materials and method thereof | |
| Gandossi et al. | The potential drop method for monitoring crack growth in real components subjected to combined fatigue and creep conditions: application of FE techniques for deriving calibration curves | |
| CN102967809A (en) | Corona resistance testing device and method for varnished wires | |
| CN104459412A (en) | Transformer thermal ageing real-time simulation measurement device and application thereof | |
| Li et al. | Cox-proportional hazards modeling in reliability analysis—A study of electromagnetic relays data | |
| CN100595600C (en) | Method for revising relative air density of DC equipment corona-starting voltage | |
| CN104535410A (en) | Temperature compensation method used for compact tension sample high temperature crack expansion test | |
| CN109870481B (en) | Calibration device and calibration method for crack propagation signal by water bath method | |
| CN103727982A (en) | Heat gun calibrating method | |
| CN201222042Y (en) | Apparatus for measuring material thermal conductivity parameter | |
| CN200996949Y (en) | Steel wire thermal-expansion coefficient determiner | |
| CN113761712A (en) | Method and system for evaluating measurement uncertainty of calibration system | |
| Kumar et al. | Simulation and experimental research of material removal rate in micro-electrochemical discharge machining process | |
| CN102495384B (en) | Transition resistance simulation device of on-load tap-changer of transformer | |
| CN203422878U (en) | Electricity comprehensive experimental instrument integrated case | |
| JPH05264207A (en) | Measuring instrument for thickness of liquid film | |
| CN108844886B (en) | Power-on acceleration simulation system and method for accurately controlling pitting corrosion | |
| CN111879425A (en) | In-situ temperature measuring gasket in diamond anvil cell press and preparation method thereof | |
| CN204287357U (en) | A kind of bicavate transformer heat ageing real time modelling measurement mechanism | |
| CN204269747U (en) | A kind of transformer heat ageing real time modelling measurement mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |