CN101832970A - Device and method for reckoning fatigue crack propagation rate of flat alloy by AC potentiometry - Google Patents
Device and method for reckoning fatigue crack propagation rate of flat alloy by AC potentiometry Download PDFInfo
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Abstract
The invention provides a device and a method for reckoning the fatigue crack propagation rate of a flat alloy by AC potentiometry, relating to the field of detecting material fatigue performance. The method comprises the following steps: in the process of a tension-tension fatigue test, two pairs of probes are arranged on the surface of a flat alloy sample, and the sample monitors electric potential change at the two sides of a crack in real time by an AC potentiometry sensor thereon when the fatigue crack propagates; the electric potential change is transmitted to a dual-trace oscilloscope by an amplifier; the dual-trace oscilloscope displays the electric potential oscillogram of the propagation of the two ends of the crack; and the electric potential oscillogram is input to a computer by an A/D converter, and is analyzed by a bundled software to obtain fatigue propagation rate such as the fatigue crack propagation rate and the like. The device of the invention mainly comprises a fatigue-testing machine, sample fixtures, the AC potentiometry sensor, potential measurement probes, lead wires, a signal amplifier, the dual-trace oscilloscope, the A/D converter, a CCD image acquisition system and the computer. The invention is applicable to research on the fatigue crack propagation behavior of the alloy.
Description
Technical field
The present invention relates to fatigue of materials Performance Detection field, refer in particular to a kind of method and apparatus of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry, mainly be applicable to the research of alloy fatigue crack propagation behavior.
Background technology
The antifatigue crack propagation performance of material becomes important parameter in the design of real member, for guaranteeing the requirement of member safe handling, need the fatigue and the crack propagation behavior of research material.Therefore function formula when adopting potential method to derive crack Propagation between potential difference (PD) and the crack length can be used to calculate FATIGUE CRACK GROWTH speed with potential difference (PD) as the function that characterizes crack position and dimensional parameters.The potential monitoring method is divided into dc-bit method (DCPD) and ac potential method (ACPD), and the ac potential method mainly is to be used for monitoring the conductive surface crackle to produce and spread scenarios.
During ac potential method monitoring crack Propagation, add alternating current and provide lasting alternating current by a pair of current supply probe to member, the potential difference (PD) when a pair of potential measurement probe is monitored the point-to-point transmission crack Propagation changes, and voltage table shows the respective electrical place value.By monitoring and analysis potential difference signal, can draw the component surface fatigue crack and produce and spread scenarios, obtain crack propagation data such as fatigue crack growth rate at last.
Rapid crack is especially in the two-forty district, and crackle is tired to be expanded, and various noise in the expansion, and external environment is abominable in addition, brings many troubles for the surperficial crack Propagation of real-time monitoring.And the long-time auto-real-time monitoring crack Propagation of ac potential method energy is easy to operate, simple and easy, is suitable as the method for research material crack propagation behavior.
The patent that relates to the ac potential method both at home and abroad seldom, application number is that 03128293.8 Chinese patent " detects the ground electrical measurement method of underground metallic conduit corrosion condition ", utilize ac potential method principle to detect underground metallic conduit corrosion condition, it is characterized in that based on ac potential method monitoring principle, arrange ground connection transmitting electrode and potential electrode along survey line perpendicular to pipeline rout, potential electrode is connected the voltage table that replaces with in the principle and is connected with the wide spectrum electric pilot, constantly change frequency with the wide spectrum electric pilot and carry out potential difference (PD) amplitude and phase measurement, determine according to the size of the unusual amplitude of pipeline on the phase frequency spectral curve whether pipeline is corroded and is corroded degree again.This method needs constantly to change wide spectrum electric pilot frequency in detection, and automatism and blindness are bigger; Formula based on the theoretical formula of the amplitude of alternating electric field and phase place is more loaded down with trivial details, and calculated amount is big; And detect extent of corrosion with the ac potential method, other tired expansion is not related to, application surface is narrow, can not draw the overall process of corrosion fatigue expansion automatically.
Wang Liang
[1]Deng the people once inquired into dc-bit method under the high temperature measure the method for crack Propagation and use in solution ([1] Wang Liang of going wrong, Ding Chuanfu. dc-bit method is measured the application [J] of crack length under the high temperature. physical and chemical inspection-physics fascicle, 2006,42 (9): 454-456).This method and ac potential method measuring principle are similar, different is that impressed current is a direct current, this method can record fatigue crack length, the automaticity that improves, weak point is that this method adopts at sample punching embedding potential measurement probe, destroy the integrality of sample, be difficult to realize Non-Destructive Testing.
Summary of the invention
The objective of the invention is to diminish deficiencies such as sample integrality, the limitation of data integrity record, the restriction of monitoring various alloy sample crack Propagation environmental factors and the raising of system and device precision for overcoming potential measurement probe embedding sample, design improved ac potential method sensor, potential change during by the expansion of improvement potential measurement probe monitoring crackle two, add the visual image of the online shooting specimen surface of CCD crack propagation, thereby propose a kind of method and apparatus of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry.
The method that the present invention adopts is: the flat alloy sample that has precrack draws in the whole process of testing fatigue, electric potential signal when the ac potential method sensor that is installed in the surface crack place is expanded by potential measurement probe on-line real time monitoring crackle two, after amplifier amplifies, in dual trace oscilloscope, demonstrate two potential waveform figure, the electric potential signal that monitors is stored in the computing machine at last, by supporting integrated software, from computing machine, draw sample crack Propagation data such as fatigue crack growth rate etc., be the whole process of concrete statement crack Propagation, adopt the ccd image acquisition system among the present invention, the record crack propagation process also deposits computing machine in, take the situation directly perceived of crack Propagation from another angle comprehensively, avoid the careless omission of crack Propagation important research details.
The device of implementing this method comprises fatigue tester and specimen holder, precrack flat alloy sample, ac potential method sensor, potential measurement probe, lead-in wire, signal amplifier, dual trace oscilloscope, A/D converter, ccd image acquisition system and has the computing machine of supporting integrated software.Induce coil to be installed in the surface of the flat alloy sample that has precrack together with two pairs of potential measurement probes in a pair of rectangle of ac potential method sensor, two pairs of potential measurement probes are positioned at two of precrack and this crackle are contained in the centre position, two of ac potential method sensor induce coil to lay respectively at tested alloy sample precrack two, surface and two pairs of potential measurement probes are comprised wherein, integral body places on the fatigue tester, with anchor clamps the alloy sample two ends is fixed; Lead on the flat-top lid of one of them probe of every pair of potential measurement probe links to each other with the input end of a signal amplifier, and the lead on another flat-top lid then links to each other with the output terminal of dual trace oscilloscope; Be connected with two input ends of dual trace oscilloscope with the output terminal of lead with two signal amplifiers, the output terminal of dual trace oscilloscope then links to each other with the input end of A/D converter again, at last with the output terminal of A/D converter and the computing machine that has supporting integrated software.Ccd image acquisition system and fatigue tester also link to each other with this computing machine.
The potential measurement probe is made of two parts, i.e. cylinder blanket and the flat-top lid that is embedded with lead.Cylinder blanket connects by middle snap lock, the conducting resinl of two pairs of cylindrical shapes on the flat alloy sample, moulding in precrack two head region, entangle with the conducting resinl of cylinder blanket two pairs of cylindrical shapes, continue again in these two pairs of cylinder blankets, to inject conducting resinl, allow the conducting resinl and the shell of cylindrical shape combine closely, make the potential measurement probe can be fixed in the measurement zone, cover the flat-top lid that is embedded with lead at last.
Cylinder blanket convenient disassembly, freedom, need not brokenly the ring sample integrality, reusable.The flat-top lid is designed to the flat-top shape, can guarantee that conducting resinl fills with shell, and the tinsel in the lead is applied in the shell simultaneously, guarantees best conductive effect.Cylinder blanket and flat deck roof are to be composited by two kinds of materials, and skin all adopts insulating material such as electro-insulating rubber to make, and can shield the interference of extraneous big resistance etc., and internal layer all adopts conductive material, is made of such as copper, and guarantees good conductivity.She Ji potential measurement probe can be fixed on crack Propagation measurement zone monitoring potential change like this, do not need to destroy sample yet, as embedding probe etc. to sample punching, and the interference of the design of insulation can avoid extraneous high resistance object that fatigue crack is monitored the time.
Two of ac potential method sensor induce coil to lay respectively at tested alloy sample precrack two, surface and two pairs of potential measurement probes are comprised wherein, with induce coil by rectangle around to 22mm-25mm height, the long 55mm-59mm of this rectangle, wide 25mm-29mm, Δ=35-39mm.The extrinsic motivated electric current flows in this inducing coil, and the electric field of variation produces induced magnetic field, induces the generation induced current between two pairs of potential measurement probes, impressed current is provided for this sensor.The coil of inducing in this improved ac potential method gathers the local test scope with induced current, and electric current diffusion diminishes, and it is just clear relatively to monitor potential value, precision improvement.
The method concrete steps of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry are as follows:
(6) two head region of the precrack on the flat alloy sample are installed two pairs of potential measurement probes, precrack is contained in the centre position, again crackle two around on induce coil to form ac potential method sensor, integral body places on the fatigue tester, the extrinsic motivated electric current flows in inducing coil, lead on one of them flat-top lid of every pair of potential measurement probe is linked to each other with a signal amplifier, lead on another flat-top lid then is connected with the output terminal of dual trace oscilloscope, the signal amplifier that links together with lead in the open system again, dual trace oscilloscope, A/D converter, ccd image acquisition system and have the devices such as computing machine of supporting integrated software, and make fatigue tester in running order.
(7) signal of crackle two potential change of causing by two pairs of potential measurement probe on-line real time monitoring crack Propagation of ac potential method sensor.
(8) two signal amplifiers amplify crackle two potential change signal that two pairs of potential measurement probes monitor, and are sent in the dual trace oscilloscope potential data when showing the expansion of crackle two simultaneously by dual trace oscilloscope and can survey oscillogram.
(9) electric signal collected of above-mentioned dual trace oscilloscope is in two A/D converters input computing machines, and potential data machine is as calculated handled crack propagation data such as drawing fatigue crack growth rate.Computer software is based on the potential change of Johnson derivation and the functional relation between the crack Propagation parameter.
(10) CCD is used for taking the image of whole Fatigue Cracks Propagation, and recorded information also is stored in the computing machine that contains software kit, avoids the careless omission of crack Propagation important research details, carries out standby to the subsequent treatment of crack Propagation.
The present invention compares with existing potential method monitoring crack Propagation, has following advantage:
(1) the potential measurement probe that designs among the present invention promptly possesses the effect of transmitting alternating current, can completely cut off extraneous possible high resistance again and disturb.This probe is made of two parts, i.e. cylinder blanket and flat deck roof, and cylinder blanket is formed by two kinds of material sortings, and inner layer material has higher conductive capability, and skin has shielding action, can freely open, and is convenient to repeatedly use; Flat-top cover design, purpose are that the cylindrical shell therewith that the conducting resinl of inside injection is moulded meets fully, improve electrical efficiency.
(2) among the present invention general ac potential method is improved, adopt the Theory of Electromagnetic Field of " magnetoelectricity interpromoting relation in five elements ", excite magnetic field with exciting current, produce induced current in the area monitoring zone, compare with general ac potential method, this induced current is dispersed few, can accumulate in the monitored area, has improved the precision of monitoring electric potential signal.
(3) two pairs of potential measurement probes are set at crackle two, and electric potential signal during with the sample two crack Propagation that monitors, after amplifier amplifies, deliver to dual trace oscilloscope, so not only can read the size of electric potential signal simultaneously, more can intuitively demonstrate the oscillogram of the electric potential signal that these two pairs of potential measurement probes monitor.
(4) alloy specimen surface place crack Propagation is adopted the ccd image acquisition system, can take the spread scenarios of alloy sample surface fatigue crackle in real time, software by supporting design in this system, can carry out follow-up study to surperficial crack Propagation handles, from many aspects, multi-angle is understood crack Propagation, the details of the crack Propagation that difficult carelessness is important.
(5) fatigue tester Control Software, crack Propagation analysis software and ccd image acquisition system integrated software system are housed in the computing machine.The crack Propagation analysis software can onlinely draw tired growth daties such as fatigue crack growth rate and comprise numerical value and diagram based on the funtcional relationship between Johnson current potential and the crack Propagation parameter.
Description of drawings
Fig. 1 is the closed control system synoptic diagram of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry.
Fig. 2 is the synoptic diagram of device at the ac potential method sensor (4) at alloy sample surface crack place.
Fig. 3 is ac potential method sensor (4) the system and device three-view diagram that places alloy sample surface crack place.
Fig. 4 is potential measurement probe (a 6) structural design drawing.
Fig. 5 is embedded with the flat-top lid (17) of lead-in wire (7) for potential measurement probe (6)
Fig. 6 is probe (6) cylinder blanket (18) structural drawing of monitoring electric potential signal.
Ccd image acquisition system (12) diagram of Fig. 7 for specimen surface place crack Propagation is taken in real time
Fig. 8 is computing machine (11) synoptic diagram that fatigue tester Control Software, crack Propagation analysis software and ccd image acquisition system software are installed.
Among the figure, 1. fatigue tester 2. specimen holders 3. flat alloy samples 4. ac potential method sensors 5. prepared surface crackles 6. potential measurement probes 7. leads 8. signal amplifiers 9. dual trace oscilloscope 10.A/D converters 11. computing machine 12.CCD image capturing systems 13. are induced coil 14. exciting currents 15. induced currents 16. induced magnetic fields 17. flat-top lids 18. cylinder blankets 19. tinsels 20. snap locks.
Embodiment
Describe the details and the working condition of the concrete device of the present invention's proposition in detail below in conjunction with accompanying drawing.
The device that carries out reckoning fatigue crack propagation rate of flat alloy by AC potentiometry with the present invention comprise fatigue tester (1), specimen holder (2) and between dull and stereotyped sample (3), sample on the computing machine (11) of the ac potential method sensor (4), prepared surface crackle (5), potential measurement probe (6), lead-in wire (7), signal amplifier (8), dual trace oscilloscope (9), A/D converter (10), ccd image acquisition system (12) and the installation software kit control program that install.
Fig. 1 is the closed control system synoptic diagram of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry.At first the sensor (4) based on ac potential method principle is installed on this sample (3), integral body places on the fatigue tester (1) afterwards, and sample all is in the testing fatigue state that draws in the whole observation process.Ac potential method sensor (4) on the one hand to sample provide ability of aggregation higher add alternating current (15), two pairs of potential measurement probes (6) of settling of matching surface crackle (5) two on the other hand, every pair of potential measurement probe (6) all is contained in the centre position with crackle (5), the variation of the crackle both sides current potential that real-time monitoring crack Propagation causes, these two pairs of electrode catheters monitorings (6) to current potential amplify by two amplifiers (8) respectively, be resent in the dual trace oscilloscope (9), the potential waveform figure that can show the expansion of crackle two by this oscillograph (9) simultaneously, through A/D converter (10), in the input computing machine (11), carry out the processing of crack Propagation aspect data, can draw crack propagation data such as fatigue crack growth rate.CCD (12) is used for taking the image of whole Fatigue Cracks Propagation, its image recording and fatigue tester (1) load loads and also controls and store by this computing machine (11), subsequent treatment to crack Propagation is carried out place mat, thereby forms a closed control system of monitoring crack Propagation in real time.
Fig. 2 is the synoptic diagram of device at the ac potential method sensor (4) at alloy sample surface crack place.Build a pair of rectangle on tested alloy sample surface and induce coil (13), induce coil by rectangle around to 22mm-25mm height, the long 55mm-59mm of this rectangle, wide 25mm-29mm, the centreline spacing Δ=35-39mm of two rectangles.Extrinsic motivated electric current (14) flows in this inducing coil, the electric field that changes produces induced magnetic field (16), according to the right-hand rule with induce the direction of coil current loop can judge the direction of this induced magnetic field, as Fig. 2, the induced magnetic field direction is perpendicular to specimen surface.The magnetic field that changes produces electric field, produces the strong induced current (15) of aggregation at this in the middle of inducing coil thus.
Fig. 3 is ac potential method sensor (4) the system and device three-view diagram of device at alloy sample surface crack place.The picture left above is the vertical view of improved ac potential law technology, and lower-left figure and right figure are side view.General ac potential method is improved, on tested sample, build a pair of rectangle and induce coil (13), a=25mm-29mm, b=55mm-59mm, c=22mm-25mm, h=5～12mm, H=0mm, feed exciting current (14) to this to inducing coil, make in the middle of two coils, to induce and produce induced current (15), and this induced current flows through crackle and is equivalent in the above-mentioned synoptic diagram 2 directly to add alternating current with what lead was introduced, induced current in this improved ac potential method is not directly to introduce with lead, but induces generation.This improved ac potential law technology is more much bigger than the potential value that general potential method technical monitoring arrives, especially the monitoring of counter stress corrosion cracking expansion, its potential value that monitors is bigger tens times than general potential method, and its precision is also higher than general potential method technology.The electric current that uses in improved ac potential method and the general potential method is compared, because induce coil that induced current is gathered the local test scope, the electric current diffusion diminishes, and it is just clear relatively to monitor potential value, precision improvement.As seen the ac potential method among the present invention can also be used to monitoring surperficial fatigue crack depth direction spread scenarios.
Fig. 4 is potential measurement probe (a 6) structural design drawing.This probe is made of two parts, i.e. cylinder blanket (18) and be embedded with the flat-top lid (17) of lead.The conducting resinl of two pairs of cylindrical shapes in last precrack (5) two head region of flat alloy sample (3), moulding, entangle with the conducting resinl of cylinder blanket (18) two pairs of cylindrical shapes, continue in these two pairs of cylinder blankets (18), to inject conducting resinl again, allow the conducting resinl and the shell (18) of cylindrical shape combine closely, make potential measurement probe (6) can be fixed in the measurement zone, cover the flat-top lid (17) that is embedded with lead at last; Distance between a pair of potential measurement probe (6) is 5mm～12mm.Conducting resinl can be selected the silver-plated conductive rubber of copper etc. for use.She Ji potential measurement probe (6) can be fixed on crack Propagation measurement zone monitoring potential change like this, do not need to destroy sample (3) yet, as embedding probe etc. to sample punching, and the interference of the design of insulation can avoid extraneous high resistance object that fatigue crack is monitored the time.
Fig. 5 is embedded with the flat-top lid (17) of lead-in wire (7) for potential measurement probe (6).Flat-top lid (17) is composited by two kinds of materials, the outer insulating material that adopts, make as electro-insulating rubber, internal layer adopts conductive material, do as copper, why like this design is filled with this potential measurement probe case (18) because can guarantee conducting resinl, tinsel (19) in the lead-in wire (7) is applied in the potential measurement probe case (18) simultaneously, guarantees best conductive effect.
Fig. 6 is probe (6) cylinder blanket (18) structural drawing of monitoring electric potential signal.Cylinder blanket (18) connects by middle snap lock (20), and the conducting resinl of going up two pairs of cylindrical shapes moulding in precrack (5) two head region at flat alloy sample (3) is entangled.Shell (18) convenient disassembly, freedom, need not brokenly the ring sample integrality, reusable, be composited by two kinds of materials, outer insulating material such as the electro-insulating rubber of adopting made, and can shield external world's interference of resistance etc. greatly, internal layer adopts conductive material, is made of such as copper, and guarantees good conductivity.
Ccd image acquisition system (12) diagram of Fig. 7 for specimen surface place crack Propagation is taken in real time.This system comprises camera system and storage system, camera system is made up of two parts again, it is the image importation that optical microscope, CCD camera and video frequency collection card are formed, also have this image output of high resolution display, the computing machine among Fig. 1 (11) can be used as image storage, processing and analytical equipment.Wherein the CCD camera need drive down with the pulsed laser pulse action, forms vision signal.Video frequency collection card is then imported the vision signal of camera collection in the computing machine, and this is installed with A/D converter and image displaying circuit, can import dynamic image and material object rapidly.The high resolution display output device can show the image of handling whole flow process fast, links to each other with input equipment.
Fig. 8 is computing machine (11) synoptic diagram that fatigue tester Control Software, crack Propagation analysis software and ccd image acquisition system software are installed.The crack Propagation analysis software is based on the current potential of Johnson derivation and the functional relation between the crack Propagation parameter, the fatigue crack growth rate data be can onlinely draw and numerical value and diagram comprised, the data that also have the torture test of various national standard sample, can be considered as making this invention have purpose and comparability with reference to the contrast object.
Ac potential method sensor is monitored the crack Propagation electric potential signal in real time, the machine software processes draws parameters such as fatigue crack growth rate as calculated, the online shooting crack Propagation of ccd image acquisition system dynamic image, multi-angle overall understanding crack Propagation situation.
Claims (4)
1. the device of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry, it is characterized in that, comprise fatigue tester (1) and specimen holder (2), ac potential method sensor (4), potential measurement probe (6), lead (7), signal amplifier (8), dual trace oscilloscope (9), A/D converter (10), ccd image acquisition system (12) and computing machine (11); The a pair of rectangle of described ac potential method sensor (4) induces coil (13) and two pairs of described potential measurement probes (6) to be installed in the surface of the flat alloy sample (3) that has precrack, two tops that described two pairs of potential measurement probes (6) are positioned at the precrack of alloy sample (3) are contained in the centre position with this crackle, induce coil (13) to lay respectively at two tops of the surperficial precrack of tested alloy sample (3) and two pairs of potential measurement probes (6) are comprised wherein for described two, alloy sample (3) places on the fatigue tester (1); The lead (7) of one of them probe of every pair of potential measurement probe (6) links to each other with the input end of a signal amplifier (8), and the lead of another probe (7) then links to each other with the output terminal of dual trace oscilloscope (9); The output terminal of two described signal amplifiers (8) is connected with two input ends of dual trace oscilloscope (9) by lead (7), the output terminal of dual trace oscilloscope (9) links to each other with the input end of A/D converter (10) by lead (7), and the output terminal of A/D converter (10) links to each other with computing machine (11) by lead (7); Described ccd image acquisition system (12) links to each other with this computing machine (11) by lead (7) with fatigue tester (1); Described computing machine (11) software is based on the potential change of Johnson derivation and the functional relation between the crack Propagation parameter.
2. the device of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry according to claim 1, it is characterized in that, described potential measurement probe (6) is made up of cylinder blanket (18) and flat deck roof (17), described flat-top lid (17) is the flat-top shape, be embedded with lead, the tinsel (19) in the described lead is applied in the cylinder blanket (18); Described cylinder blanket (18) connects by snap lock (20); Described cylinder blanket (18) and flat deck roof (17) are to be composited by two kinds of materials, and skin all adopts insulating material, and internal layer all adopts conductive material to make.
3. the device of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry according to claim 1 and 2, it is characterized in that, two of described ac potential method sensor (4) induce coil (13) to press rectangle around to the 22mm-25mm height, the long 55mm-59mm of described rectangle, wide 25mm-29mm, the centreline spacing Δ=35-39mm of two described rectangles; To described coil (13) the extrinsic motivated electric current (14) of inducing, the electric field of variation produces induced magnetic field (16), induces to produce induced current (15) between two pairs of potential measurement probes (6), impressed current is provided for this sensor.
4. implement the method for the device of reckoning fatigue crack propagation rate of flat alloy by AC potentiometry according to claim 1, it is characterized in that, concrete steps are as follows:
(1) precrack two head region on flat alloy sample (3) are installed two pairs of potential measurement probes (6), and precrack is contained in the centre position, again crackle two around on induce coil (13) to form ac potential method sensor (4); The conducting resinl of two pairs of cylindrical shapes in last precrack (5) two head region of flat alloy sample (3), moulding, entangle with the conducting resinl of cylinder blanket (18) two pairs of cylindrical shapes, continue in these two pairs of cylinder blankets (18), to inject conducting resinl again, allow the conducting resinl and the shell (18) of cylindrical shape combine closely, make potential measurement probe (6) can be fixed in the measurement zone, cover the flat-top lid (17) that is embedded with lead at last; Integral body places on the fatigue tester (1), extrinsic motivated electric current (14) flows in inducing coil (13), lead on one of them flat-top lid (17) of every pair of potential measurement probe (6) is linked to each other with a signal amplifier (8), lead on another flat-top lid (17) then is connected with the output terminal of dual trace oscilloscope (9), opens the device of described reckoning fatigue crack propagation rate of flat alloy by AC potentiometry;
(2) signal of crackle two potential change of causing of two pairs of potential measurement probes (6) the on-line real time monitoring crack Propagation by described ac potential method sensor (4);
(3) described two signal amplifiers (8) amplify crackle two potential change signal that two pairs of potential measurement probes (6) monitor, be sent in the dual trace oscilloscope (9), show the potential data in crackle two when expansion simultaneously and can survey oscillogram by dual trace oscilloscope (9);
(4) electric signal collected of described dual trace oscilloscope (9) is in two A/D converters (10) input computing machines (11), and potential data machine (11) is as calculated handled crack propagation data such as drawing fatigue crack growth rate;
(5) described CCD is used for taking the image of whole Fatigue Cracks Propagation, and recorded information also is stored in the computing machine (11) that contains software kit, avoids the careless omission of crack Propagation important research details, carries out standby to the subsequent treatment of crack Propagation.
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| CN102565140A (en) * | 2012-02-20 | 2012-07-11 | 南京航空航天大学 | Method for measuring fatigue crack growth rate on basis of potential method |
| CN105203402A (en) * | 2015-11-03 | 2015-12-30 | 华北电力大学 | Device and method for realizing high-temperature steam oxidation and stress corrosion cracking tests simultaneously |
| CN105203402B (en) * | 2015-11-03 | 2018-04-10 | 华北电力大学 | The device and method of pyrogenic steam oxidation and test for stress corrosion cracking is realized simultaneously |
| US11181498B2 (en) | 2016-11-16 | 2021-11-23 | 3M Innovative Propperties Company | Temperature-independent verifying of structural integrity of materials using electrical properties |
| US11609203B2 (en) | 2016-11-16 | 2023-03-21 | 3M Innovative Properties Company | Suppressing thermally induced voltages for verifying structural integrity of materials |
| US10983081B2 (en) | 2016-11-16 | 2021-04-20 | 3M Innovative Properties Company | Electrode placement for verifying structural integrity of materials |
| US11060993B2 (en) | 2016-11-16 | 2021-07-13 | 3M Innovative Properties Company | Suppressing thermally induced voltages for verifying structural integrity of materials |
| US11609202B2 (en) | 2016-11-16 | 2023-03-21 | 3M Innovative Properties Company | Electrode placement for verifying structural integrity of materials |
| US11255807B2 (en) | 2016-11-16 | 2022-02-22 | 3M Innovative Properties Company | Verifying structural integrity of materials |
| US10816495B2 (en) | 2016-12-16 | 2020-10-27 | 3M Innovative Properties Company | Verifying structural integrity of materials |
| US11112374B2 (en) | 2016-12-16 | 2021-09-07 | 3M Innovative Properties Company | Verifying structural integrity of materials |
| US11371952B2 (en) | 2016-12-16 | 2022-06-28 | 3M Innovative Properties Company | Verifying structural integrity of materials |
| US11105762B2 (en) | 2016-12-16 | 2021-08-31 | 3M Innovative Properties Company | Verifying structural integrity of materials using reference impedance |
| CN108680607A (en) * | 2018-08-30 | 2018-10-19 | 四川大学 | Pipeline crack corrosion monitoring process based on multi-communication potential drop |
| 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 |
| CN113533074A (en) * | 2021-07-20 | 2021-10-22 | 华东理工大学 | Material high-temperature fatigue threshold value measuring system and crack length high-precision calibration method |
| CN115046872A (en) * | 2022-08-09 | 2022-09-13 | 南通泰胜蓝岛海洋工程有限公司 | Fatigue crack real-time measuring method |
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