CN105319402A - Micro resistor measurement gripper of damage detection of metal materials and usage method thereof - Google Patents
Micro resistor measurement gripper of damage detection of metal materials and usage method thereof Download PDFInfo
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- CN105319402A CN105319402A CN201510015880.4A CN201510015880A CN105319402A CN 105319402 A CN105319402 A CN 105319402A CN 201510015880 A CN201510015880 A CN 201510015880A CN 105319402 A CN105319402 A CN 105319402A
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Abstract
The present invention provides a micro resistor measurement gripper of damage detection of metal materials and a usage method thereof. The micro resistor measurement gripper of damage detection of metal materials comprises: two test piece fixed plates configured to fix metal test pieces, two probes configured to measure resistances of the metal test pieces, two probe fixed plates configured to fix the probes, two screws configured to connect in series the test piece fixed plates with the probe fixed plates, eight nuts (with spacers) configured to fix the test piece fixed plates and the probe fixed plates, and two insulation spacers configured to insulate between the test pieces and the test piece fixed plates. The micro resistor measurement gripper is able to fix probes to the ends of the test pieces to ensure the stability of the measured reading of resistances and detect tiny variations of the resistances of metal test pieces under the action of detection load or environment, so that the accuracy and the precision of measurement may be improved and the variation of the resistances is used for representation of the damaging of the metal materials. Moreover, the micro resistor measurement gripper of damage detection of metal materials and the usage method thereof are applicable to the field of the measurement of micro resistances and resistance variation.
Description
Technical field
The present invention relates to the technical field of micro-resistance and micro-resistance change measurement, specifically a kind of resistance measurement grip device carrying out the evolution of characterizing metal material damage by detecting micro-resistance variations, and introduce the using method of this resistance measurement grip device.
Background technology
Metal and alloy material thereof use usually used as structured material, and the component be made up of it needs the effect of bearing various complex load and environment in process under arms, and thus its mechanical property is in the process of a deterioration gradually.Material damage detects the basis being not only structural intergrity assessment, is also the basis of engineering machinery and structural damage tolerance design.Therefore, for metal material various simple or complex load (stretch, compression, bending, to reverse and combination loads) measurement of the lower hierarchical loading damage of effect, the measurement damaged under the measurement damaged under especially creep, fatigue, creep-fatigue interaction and environmental activity just become Strength of Metallic Materials theoretical with apply in basic work.About the characterizing method of damage of metal material, both can adopt the change of the mechanical property parameters of metal material, mechanical performance parameter to measure, and also can adopt the change of Physical Properties of Metallicmateriais parameter to measure.Because resistance has accuracy and susceptibility to damaging the metal material microstructure change caused, and the resistance measurement of metal material is simple, and the damage of metal material sign thus based on electric-resistivity method is used widely.But in the process of measuring resistance, because the resistance of test specimen own is little, the feature that test specimen loads or after environmental activity, resistance change is less, if do not adopt custom-designed resistance measurement fixture, then brings very large difficulty can to the measurement of micro-resistance.
Under the load modes such as hierarchical loading, fatigue, creep loading or environmental activity, the resistance of metal specimen is change in process amount, needs to take multiple measurements.General measuring method is the two ends two probes directly being ridden over test specimen, or rides over specimen test segment mark line position place.But the method for this measuring resistance can not ensure that each probe rides over same position, meanwhile, always shake during people's handheld probe or be subject to the interference of other extraneous factors.The uncertainty of probe location, the shake of probe in test specimen measuring point and the slip in surface of test piece, all can cause the instability of resistance readings, and the accuracy and precision of resistance measurement is not high, is difficult to differentiate the faint change of resistance under load or environmental activity.Therefore, be necessary the microresistivity survey grip device designing a kind of effective detection damage of metal material, and introduce the using method of this device, in order to accurately to measure the initial value resistance of test specimen and the current resistance under load or environmental activity, application resistance change rate carrys out the damage development process of characterizing metal material.
Summary of the invention
The invention provides a kind of the microresistivity survey grip device and the using method that detect damaged metal, have simple to operate, data stability good, measuring accuracy is high, accuracy of measurement is high, measuring error is little, the advantage of applied range.
A kind of microresistivity survey grip device detecting damage of metal material of the present invention comprises: two pieces of upper test specimen stators 2 for fixing metal test specimen 1 and lower test specimen stator 3(test specimen stator 2 and 3 material are metal, the equal centre punching of stator 2 and 3); Two for measuring the probe 4 and 5 of metal specimen resistance; Two pieces of upper probe stators 6 for stationary probe and lower probe stator 7(probe stator 6 and 7 material are metal; The equal centre punching of probe stator 6 and 7, aperture is less than probe nib upper boss diameter, and aperture is greater than a probe body diameter); Two for being connected in series screw rod 8 and the screw rod 9 of upper and lower test specimen stator (2 and 3) and upper and lower probe stator (6 and 7); Two nuts 10 for fixing upper test specimen stator 2 and nut 11(nut configuration pad); Two nuts 12 for fixing lower test specimen stator 3 and nut 13(nut configuration pad); Two nuts 14 for fixing upper probe stator 6 and nut 15(nut configuration pad); Two nuts 16 for fixing lower probe stator 7 and nut 17(nut configuration pad); Two pieces for the upper insulation spacer 18 that insulate between test specimen and test specimen stator 6 and 7 and lower insulation spacer 19, insulation spacer centre punching, aperture is less than the aperture of test specimen stator 2 and 3 and suitable with probe tip diameter, to ensure that probe 4 and 5 effectively to contact with test specimen and to prevent the relative sliding between probe and test specimen end face.
The invention provides a kind of using method detecting the microresistivity survey grip device of damage of metal material, adopt following technical scheme.
Step one, test specimen is placed between upper test specimen stator 2 and lower test specimen stator 3 vertically, rotate test specimen stator nut 10,11,12,13, test specimen stator 2 and lower test specimen stator 3 are slowly drawn close, until specimen holder is fixed by upper test specimen stator 2 and lower test specimen stator 3, and ensure that the axis of test specimen 1, upper test specimen stator 2 and the lower test specimen stator 3 central through hole line of centres, upper insulation spacer 18 and the lower insulation spacer 19 central small hole line of centres three line overlap.
Step 2, probe 4 syringe needle pass the central small hole of insulation spacer 18 also slowly near test specimen, until probe just touches test specimen, rotating probe stator nut 14,15, probe stator 6 is moved, probe 4 is fixed, to prevent probe 4 and test specimen from coming off, ensure the stability that probe 4 contacts with test specimen.
Step 3, probe 5 syringe needle pass the central small hole of insulation spacer 19 also slowly near test specimen, until probe just touches test specimen, rotating probe stator nut 16,17, probe stator 7 is moved, probe 5 is fixed, to prevent probe 5 and test specimen from coming off, ensure the stability that probe 5 contacts with test specimen.
Step 4, probe to be picked out by wire, coordinate sense resistance bridge diagram, measure the initial resistance resistance of metal specimen.
Step 5, successively reverse rotation probe stator nut 16,17, unclamp probe stator 7, probe tip be separated with test specimen; Reverse rotation test specimen stator nut 12,13, unclamps test specimen stator 3, is taken out by test specimen.
Step 6, by specimen holder in Material Testing Machine, carry out fatigue, creep, creep-fatigue interaction test, or temperature, corrosive atmosphere test.
Step 7, will experience certain load history or the test specimen of environmental activity lower a period of time take out, repeat step one, step 3.
Step 8, probe wire to be picked out, coordinate sense resistance bridge diagram, measure the current resistance of metal specimen after experience load or environmental activity, calculate resistance change rate.
Step 9, repeat step 5, step 6, step 7, step 8, measure metal specimen resistance under different loads or environment course successively, record each resistance test data, until test specimen reaches damage tolerance and lost efficacy.
The present invention is a kind of microresistivity survey grip device and using method of detecting damage of metal material, and compared with prior art, innovative point of the present invention and beneficial effect comprise the following aspects.
1. the present invention is in the micro-resistance of detection and micro-resistance variations, has simple to operate, that measuring resistance data stability is good, measuring accuracy is high feature.Resistance has accuracy and susceptibility to damaging the metal material microstructure change caused, and under load or environmental activity, the resistance of test specimen is a change in process amount, needs to take multiple measurements.The initial resistance resistance of metal specimen is very little, and after experiencing certain load or environmental activity, the current resistance of test specimen is compared with initial resistance resistance, and its variable quantity is less.Adopt this resistance measurement grip device, can ensure that each probe contacts at same position with test specimen, probe is fixed at test piece end, avoid the shake of probe and the slip in surface of test piece, when ensureing to measure test specimen resistance, the stability of resistance reading, effectively can improve the degree of accuracy of microresistivity survey.
2. a kind of microresistivity survey grip device detecting damage of metal material of the present invention coordinates sense resistance bridge diagram, both the resistance measuring system error because the control of test method, surveying instrument used, test condition and the subjective factor of experimenter itself cause can have been reduced, also the using method of experimenter in strict accordance with microresistivity survey grip device and microresistivity survey testing regulations can be pointed out to handle affairs, avoid the human error in microresistivity survey process as far as possible, improve the accuracy of metal material test specimen microresistivity survey.
3. the present invention a kind of detect damage of metal material microresistivity survey grip device and using method applied widely, both be applicable to metal specimen various simple or complex load (stretch, compression, bending, to reverse and combination loads) measurement that the lower hierarchical loading of effect is damaged, be also applicable to the measurement that metal specimen is damaged under creep, fatigue, creep-fatigue interaction; Both be applicable to the measurement that metal specimen is damaged under normal temperature static load or Under Dynamic Load, be also applicable to the measurement that metal specimen is damaged under high temperature static load or Under Dynamic Load; Both be applicable to the measurement that metal specimen is damaged under load effect, be also applicable to the measurement that metal specimen is damaged under environmental activity.
On the whole, a kind of microresistivity survey grip device and using method detecting damage of metal material of the present invention, there is simple to operate, that data stability good, measuring accuracy is high, accuracy of measurement is high, measuring error is little advantage, the damage check of metal material test specimen under various load or environmental activity can be applied to, follow the tracks of the subtle change of metal material resistance, utilize the damage of resistance change rate characterizing metal material.The present invention is applicable to micro-resistance and micro-resistance change measurement field.
Accompanying drawing explanation
Fig. 1 is one-piece construction figure of the present invention.
Fig. 2 is one-piece construction outboard profile.
Fig. 3 is one-piece construction sectional view.
Fig. 4 is test specimen stator 2 three-view diagram.
Fig. 5 is test specimen stator 3 three-view diagram.
Fig. 6 is probe stator 6(7) three-view diagram.
1-metal specimen, 2-upper test specimen stator, 3-lower test specimen stator, 4,5-probe, 6-upper probe stator, 7-lower probe stator, 8-left screw rod, 9-right screw rod, 10,11,12,13,14,15,16,17-nut, 18-upper insulation spacer, 19-lower insulation spacer.
Fig. 7 is according to the test result figure of the embodiment of the present invention.
Embodiment
Detect microresistivity survey grip device and the using method of damage of metal material, can be used for measuring the resistance variations situation of metal specimen under load or environmental activity in real time, in order to the damage development process of characterizing metal test specimen.Below in conjunction with embodiment also with reference to accompanying drawing, set forth the present invention further.
Embodiment 1.
Detecting microresistivity survey grip device and the using method of damage of metal material, for measuring test specimen resistance variations situation in fatigue and damage experiment, characterizing the damage development process of test specimen.
Step one, test specimen is placed on vertically between upper test specimen stator 2 and lower test specimen stator 3, the center of insulation spacer 18 and lower insulation spacer 19 is aimed at the center at test specimen two ends respectively, rotate test specimen stator nut 10, 11, 12, 13, test specimen stator 2 and lower test specimen stator 3 are slowly drawn close, until specimen holder is fixed by upper test specimen stator 2 and lower test specimen stator 3, and ensure the axis of test specimen 1, upper test specimen stator 2 and lower test specimen stator 3 central through hole line, upper insulation spacer 18 and the lower insulation spacer 19 central small hole line of centres three line overlap.
Step 2, probe 4 syringe needle pass the central small hole of insulation spacer 18 also slowly near test specimen, until probe just touches test specimen, rotating probe stator nut 14,15, probe stator 6 is moved, probe 4 is fixed, to prevent probe 4 and test specimen from coming off, ensure the stability that probe 4 contacts with test specimen.
Step 3, probe 5 syringe needle pass the central small hole of insulation spacer 19 also slowly near test specimen, until probe just touches test specimen, rotating probe stator nut 16,17, probe stator 7 is moved, probe 5 is fixed, to prevent probe 5 and test specimen from coming off, ensure the stability that probe 5 contacts with test specimen.
Step 4, probe to be picked out by wire, coordinate precision resister surveying instrument QJ57 type direct current resistance electric bridge (measurement range is 0.01 μ Ω ~ 1111.10 Ω), measure the initial resistance resistance of test specimen.
Step 5, successively reverse rotation probe stator nut 16,17, unclamp probe stator, probe tip be separated with test specimen; Reverse rotation test specimen stator nut 12,13, unclamps test specimen stator, is taken out by test specimen.
Step 6, by specimen holder on fatigue tester, carry out torture test.
Step 7, every certain tired cycle, unclamp torture test machine clamp, test specimen is taken out, repeat step one, step 3, probe wire is picked out, coordinate QJ57 type direct current resistance electric bridge, after measuring the certain tired cycle of experience, the current resistance of test specimen.
Step 8, repetition step 5, step 6, step 7, test specimen resistance under the different fatigue of measurement experience successively cycle, records each test figure, until test specimen reaches damage tolerance and lost efficacy.
Step 9, test figure to be processed, calculate corresponding different fatigue cycle, the resistance change rate of test specimen, and adopt resistance change rate to carry out the damage development process of characterizing metal material.
Under Cyclic Load, the micromechanism of material can change, and namely cyclic loading causes the damage of material.The generation of these microdefects, makes the parameters such as the elastic modulus of material, effective bearing area, density and resistance change.Injury tolerance
ddefinition be
D=1-(
A/
A 0)(1)
In formula,
afor impaired rear effective bearing area,
a 0for impaired front effective bearing area.
For high-cycle fatigue test, if suppose, impaired front and back piece lengths and resistivity remain unchanged, then according to the relation of resistance and cross-sectional area, can obtain
D=1-(
R 0/
R)=Δ
R/(
R 0+Δ
R)(2)
In formula,
rfor impaired rear test specimen resistance,
r 0for impaired front test specimen resistance, Δ
r=
r-
r 0for the resistance change of impaired front and back.
Chaboche damage model is adopted to describe Metal Material Fatigue accumulated damage evolutionary process, namely
d
D/d
N={
σ a/[
b(1-
D)]}
β (1-
D)
-
β1
(3)
In formula,
nrepresent tired cycle,
σ afor stress amplitude,
bwith
b 1for material constant, and
b=
b 0(1-
b 1 σ m),
b 0with
b 1for material constant,
σ mfor mean stress.
To formula (3) integration,
D=1-[1-(1+
β+
β 1)(
σ a/
b)
β N]
1/(1+
β+
β1)
(4)
According to the starting condition of fatigue damage (
n=0,
d=0) and final value condition (
n=
n f,
d=1;
n ffor fatigue lifetime), formula (4) can be rewritten as
D=1-[1-(
N/
N f)]
1/(1+
β+
β1)
(5)
Formula (2) is substituted into formula (5), can obtain
Δ
R/
R 0=[1-(
N/
N f)]
-1/(1+
β+
β1)
-1(6)
Formula (6) is the damage of metal material EVOLUTION EQUATION characterized with resistance change rate.
Carry out high-cycle fatigue test to certain titanium alloy test specimen, the resistance change rate collected changes test figure as shown in symbol in Fig. 7 " ■ " with tired cycle.Applying equation (6) carries out nonlinear regression analysis to test figure, and its damage development curve is as shown in solid line in Fig. 7.
Claims (7)
1. detect a microresistivity survey grip device for damage of metal material, it is characterized in that, comprising:
Test specimen stator, both sides symmetry have two fixed vias passed for screw rod, there is a through hole passed through for probe at its center, and two pieces of test specimen stators are by applying pressure with fixing test specimen with test specimen two end in contact to test specimen;
Probe, two probes contact the resistance to measure test specimen with test specimen two sections respectively, and probe nib upper circular boss diameter is greater than the diameter of a probe body;
Probe stator, both sides symmetry have two fixed vias passed for screw rod, center has one for the through hole of stationary probe, in order to block probe nib upper boss, probe is contacted with test specimen;
Screw rod, is fixed test specimen stator and probe stator entirety by nut.
2. resistance measurement grip device as claimed in claim 1, is characterized in that, also comprise:
Insulation spacer, this insulation spacer and test specimen stator are fixed together, and there is the aperture be convenient to probe and passed through at center, for the insulation between test specimen and measured material device.
3. the resistance measurement grip device as described in claim 1,2, is characterized in that, insulation spacer central small hole aperture is suitable with probe tip diameter, to prevent the relative sliding between probe and test specimen.
4. the resistance measurement grip device as described in claim 1,2, it is characterized in that, test specimen stator central through hole aperture should be greater than insulation spacer small aperture, makes probe tip smoothly by test specimen stator central through hole, avoid probe and test specimen stator to come in contact.
5. the resistance measurement grip device as described in claim 1,2, it is characterized in that, probe stator central through hole aperture should be greater than a probe body diameter and be less than probe nib upper boss diameter, make a probe body can smoothly by probe stator central through hole, and probe nib upper boss can be blocked by probe stator central through hole.
6. the resistance measurement grip device as described in claim 1,2,3,4,5, is characterized in that, test specimen stator and probe stator length and width ratio are 4 to 1, and test specimen stator width must be greater than the characteristic dimension of test piece end xsect.
7. detect a using method for the microresistivity survey grip device of damage of metal material, it comprises the steps:
Step one, test specimen is placed between two pieces of test specimen stators, rotate test specimen stator nut, the distance of adjustment two pieces of test specimen stators, fixes test specimen, and ensures that test specimen axis, the two ends test specimen stator central through hole line of centres, the insulation spacer central small hole line of centres three line overlap;
Step 2, the probe stator installing probe is inserted in two standing screws, probe contacts with test specimen with insulation spacer central small hole respectively by test specimen stator central through hole, rotating probe stator nut, the distance of adjustment two panels probe stator, is fixed on probe tip on test specimen;
Step 3, probe wire to be picked out, coordinate sense resistance bridge diagram, measure the initial resistance resistance of metal specimen;
Step 4, successively reverse rotation probe stator nut, unclamp probe stator, probe tip be separated with test specimen; Reverse rotation test specimen stator nut, unclamps test specimen stator, is taken out by test specimen;
Step 5, by specimen holder in Material Testing Machine, carry out fatigue, creep, creep-fatigue interaction test, or temperature, corrosive atmosphere test;
Step 6, will experience certain loading sequence or the test specimen of environmental activity lower a period of time take out, repeat step one, step 2;
Step 7, probe wire to be picked out, coordinate sense resistance bridge diagram, measure the current resistance of metal specimen under experience load or environmental activity, calculate resistance change rate;
Step 8, repeat step 4, step 5, step 6, step 7, measure metal specimen resistance under different loads or environment course successively, record each resistance test data, until test specimen reaches damage tolerance and lost efficacy.
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| CN201510015880.4A CN105319402B (en) | 2015-01-13 | 2015-01-13 | A kind of microresistivity survey grip device and application method for detecting damage of metal material |
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| CN105319402B CN105319402B (en) | 2018-03-09 |
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| CN106770674A (en) * | 2016-12-06 | 2017-05-31 | 大连理工大学 | A kind of ultrasonic cutter detecting method |
| WO2018103323A1 (en) * | 2016-12-06 | 2018-06-14 | 大连理工大学 | Ultrasonic cutter detection method and device |
| CN109632897A (en) * | 2019-01-07 | 2019-04-16 | 中材科技股份有限公司 | A kind of damage detecting method of conductive fiber tow |
| CN110044740A (en) * | 2019-04-22 | 2019-07-23 | 东南大学 | Measuring method, application, device and the fixture of cable steel wire corrosion fatigue damage rule |
| CN111208325A (en) * | 2020-03-03 | 2020-05-29 | 东南大学 | Four-end measuring clamp capable of achieving accurate positioning |
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| CN109632897A (en) * | 2019-01-07 | 2019-04-16 | 中材科技股份有限公司 | A kind of damage detecting method of conductive fiber tow |
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| CN110044740B (en) * | 2019-04-22 | 2021-12-24 | 东南大学 | Method, application, device and clamp for measuring corrosion fatigue damage law of cable steel wire |
| CN111208325A (en) * | 2020-03-03 | 2020-05-29 | 东南大学 | Four-end measuring clamp capable of achieving accurate positioning |
| CN114660126A (en) * | 2022-03-18 | 2022-06-24 | 为天(深圳)检测科技有限公司 | Metal structure health monitoring method and low-temperature welding method for monitoring |
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