CN106053608A - Ultrasonic fatigue testing method of cylindrical sample with uniform cross sections - Google Patents

Ultrasonic fatigue testing method of cylindrical sample with uniform cross sections Download PDF

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CN106053608A
CN106053608A CN201610340473.5A CN201610340473A CN106053608A CN 106053608 A CN106053608 A CN 106053608A CN 201610340473 A CN201610340473 A CN 201610340473A CN 106053608 A CN106053608 A CN 106053608A
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sample
cylindrical sample
ultrasonic fatigue
uiform section
section cylindrical
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彭文杰
骆海贺
严龙
薛欢
刘冬
邝兰翔
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0234—Metals, e.g. steel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/262—Linear objects

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  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses an ultrasonic fatigue testing method of a cylindrical sample with uniform cross sections. The method comprises the following steps: (1) determining the size of a cylindrical sample with uniform cross sections; (2) processing a material into a cylindrical sample with uniform cross sections; (3) fixing the cylindrical sample in a displacement amplifier of an ultrasonic fatigue testing machine; (4) starting ultrasonic fatigue system control software, picking the sample type as a transition arc containing cylindrical sample, and determining the size of the transition arc containing cylindrical sample; (5) determining the stress amplitude ([sigma]<max>) that is loaded on the cylindrical sample, and calculating the stress amplitude ([sigma]<0><max>) that is loaded on the transition arc containing cylindrical sample under a same displacement amplitude; (6) inputting the stress amplitude ([sigma]<0><max>) into the ultrasonic fatigue system control software, setting other test parameters, and starting an ultrasonic fatigue test until the sample is broken down. The ultrasonic fatigue test control of a cylindrical sample with uniform cross sections is indirectly realized through the ultrasonic fatigue test control of a transition arc containing cylindrical sample.

Description

Uiform section cylindrical sample Ultrasonic fatigue testing method
Technical field
The present invention relates to a kind of metal material Ultrasonic fatigue testing method, particularly relate to a kind of uiform section cylindrical sample and surpass Acoustic fatigue test method.
Background technology
Ultrasonic fatigue testing is a kind of new technique testing fatigue of materials performance, and it uses piezoelectric ceramic transducer by high frequency The signal of telecommunication of power supply supply is converted into the mechanical vibration of same frequency, then amplifies through vibration displacement amplifier.Sample one end with Displacement amplifier is connected, and other end is freely.Under the excitation of displacement amplifier, there is resonance, generate resonance wave in the sample, It is axially formed cyclic load under symmetric tension-compression along sample, sets up length travel, stress (strain) field.
Relative to traditional testing fatigue technology, the advantage of Ultrasonic fatigue testing is it is clear that the operating frequency of its test High, fatigue test efficiency can be greatly improved, be mainly used in the Fatigue Life in Very High Cycle test of high-strength steel.Traditional high frequency is tired Labor experiment work frequency is 100～200Hz, and the operating frequency of Ultrasonic fatigue testing can reach 2.0 × 104Hz is (because of ultrasonic Fatigue machine and different), testing a fatigue life is 1 × 109Sample, traditional high-cycle fatigue need to carry out 100 days left Right continual test, and Ultrasonic fatigue testing only needs the time of about one day to complete.Ultrasonic fatigue testing technology is One revolution in testing fatigue field, greatly improves test efficiency and efficiency of research and development.
At present steel high-end market has the biggest demand to super high cycle fatigue test, utilizes the Ultrasonic fatigue testing technology can Obtain Important Project steel 107Fatigue Life in Very High Cycle more than cycle, and it is supplied to user, design safer for user Tired criterion provides reference, and the range of application to popularization product, space of exploiting market has great significance.
Existing Ultrasonic Fatigue Test-Bed, as a example by the USF-2000 Ultrasonic Fatigue Test-Bed that Shimadzu Corporation of Japan produces, System controlling software on its equipment is only furnished with containing transition arcs and the cylindrical sample containing breach, the most as depicted in figs. 1 and 2, Wherein the use containing transition arcs cylindrical sample with Fig. 1 is relatively broad.But exist the most several containing transition arcs cylindrical sample Subject matter:
1) design is containing when transition arcs is cylindrical and other contain transition arcs Specimen for Fatigue Test at Ultrasonic Frequency, the most false for ease of analytical Calculation If sample variable cross-section section curve is catenary, but machining has been difficult to, and generally adds man-hour actual, comes with circular arc camber Substituting catenary curved surface, this replacement can cause the indeed vibrations shift value of sample to there is deviation with theoretical value, thus impact is super The degree of accuracy of acoustic fatigue test result.
2) fatigue test is higher to specimen surface smoothness requirements, and especially super high cycle fatigue test is bright and clean to specimen surface Degree requires higher, contains transition arcs containing transition arcs cylindrical sample due to centre and causes sample polishing difficulty to strengthen, thus affects The surface smoothness of sample.
3) sometimes, need to be acquired sample vibration strains analyzing.Containing transition arcs cylindrical sample with containing lacking The cylindrical sample of mouth, owing to containing transition arcs and breach in the middle of sample, causes foil gauge to paste, thus cannot be to strain It is acquired analyzing.
4) the displacement amplitude interval of general Ultrasonic Fatigue Test-Bed steady operation is 10 μm～50 μm.To some intensity level Relatively low material, tests if being designed to the cylindrical sample containing transition arcs, it is possible that displacement amplitude is too small and causes Test instability, even cannot the situation of starting of oscillation.
Summary of the invention
It is an object of the invention to provide a kind of uiform section cylindrical sample Ultrasonic fatigue testing method, make uiform section cylinder Shape Specimen for Fatigue Test at Ultrasonic Frequency can occur resonance effectively on Ultrasonic Fatigue Test-Bed, and by the stress of uiform section cylindrical sample It is converted on system controlling software the stress containing transition arcs cylindrical sample, to realize utilizing existing equipment and software to complete Uiform section cylindrical sample Ultrasonic fatigue testing controls.
For achieving the above object, the uiform section cylindrical sample Ultrasonic fatigue testing method designed by the present invention, including such as Lower step:
1) size of the uiform section cylindrical sample that resonance occurs under frequency f is determined,
Determine uiform section cylindrical sample resonance length L the most as follows:
L = 1 2 f E &rho; ,
Wherein, f is ultrasonic fatigue system frequency (the sample frequency of vibration of resonance i.e. occurs), and ρ is the density of test material, E is the elastic modelling quantity of test material；
B. draft the radius R of uiform section cylindrical sample, owing to not affecting resonance, arbitrarily can give according to practical situation Fixed；
2) according to the resonance length L and radius R of the uiform section cylindrical sample obtained, materials processing is become uiform section cylinder Shape sample, and specimen surface is polished；
3) the uiform section cylindrical sample processed is fixed in Ultrasonic Fatigue Test-Bed displacement amplifier；
4) opening ultrasonic fatigue system controlling software, choosing specimen types is containing transition arcs cylindrical sample, determines frequency f The dimensional parameters containing transition arcs cylindrical sample of lower generation resonance:WithWhereinThe thinnest for sample The radius at place,For the radius of cylindrical section at sample two ends,For the half of sample transition arcs segment length,For sample one end The length (resonance length) of cylindrical section；
5) stress amplitude σ that uiform section cylindrical sample needs to load is draftedmax, try to achieve as follows with uiform section The stress amplitude needing loading containing transition arcs cylindrical sample corresponding under the displacement amplitude that cylindrical sample is identical
Wherein, &beta; = &alpha; 2 - k 2 , k = 2 &pi; f / E &rho; ;
6) in ultrasonic fatigue system controlling software, input needs the stress amplitude loaded containing transition arcs cylindrical sample
7), after setting other every test parameterss in Control System Software, the axial of uiform section cylindrical sample is started Tension and compression Ultrasonic fatigue testing, until sample fracture.
Preferably, step 2) in, surface roughness R after polishing specimen surfacea≤0.4.It is said that in general, the strength of materials is more Height, requires the highest to polishing, i.e. RaThe least.
Alternatively, step 4) in, the dimensional parameters containing transition arcs cylindrical sample determines by the following method:
1) draft
2)Automatically be given by Ultrasonic Fatigue Test-Bed system controlling software.
Alternatively, step 4) in, the dimensional parameters containing transition arcs cylindrical sample determines by the following method:
1) draft
2)It is calculated by below equation:
L 2 0 = 1 k a r c t a n { 1 k &lsqb; &beta; tanh ( &beta;L 1 0 ) - &alpha; tanh ( &alpha;L 1 0 ) &rsqb; }
In formula,ρ is sample material Density, E is the elastic modelling quantity of sample material, and f is sample frequency of vibration.
Preferably, during Ultrasonic fatigue testing, (preferably position, middle, i.e. stress, registration coupon middle part Maximum) winding-up cold air to cool down uiform section cylindrical sample.Cooled down by winding-up cold air, uiform section can be avoided cylindrical Sample is overheated during fatigue test.The mode that can also use water spray cools down.
Preferably, it is-1 that the method is applied to stress ratio, the axial push-pull ultrasonic fatigue of frequency of vibration f=15～30KHz Test.
Preferably due to the displacement amplitude scope of Ultrasonic Fatigue Test-Bed is generally 10 μm～50 μm, therefore, to springform Amount is E, and density is ρ uiform section cylindrical sample, proof stress amplitude σmaxScope is:
2 f &pi; E &rho; &times; ( 10 &mu; m ) ~ 2 f &pi; E &rho; &times; ( 50 &mu; m ) .
There is advantages that
1) uiform section cylindrical ultrasound fatigue testing specimen is applicable to low intensity metal material, extends Ultrasonic Fatigue Test-Bed The scope of application.
2) uiform section cylindrical sample can occur resonance effectively on Ultrasonic Fatigue Test-Bed, and test frequency is high, energy Enough greatly accelerate fatigue test.
3) utilize existing equipment and software by the Ultrasonic fatigue testing containing transition arcs cylindrical sample is controlled indirectly Achieve uiform section cylindrical sample Ultrasonic fatigue testing control, it is not necessary to software and the upgrading of equipment, saved and tested into This.
4) simple in construction of uiform section cylindrical sample, mismachining tolerance is little, and is easily polished and obtains surface smoothness very High sample.
5) additionally, for uiform section cylindrical sample, conveniently foil gauge can be pasted at specimen surface and come examination The vibration strains of sample is acquired analyzing.
Accompanying drawing explanation
Fig. 1 is the structural representation containing transition arcs cylindrical sample.
Fig. 2 is the structural representation containing breach cylindrical sample.
Fig. 3 is uiform section cylindrical sample and stress amplitude thereof and the schematic diagram of displacement width distribution.
Fig. 4 is containing transition arcs cylindrical sample and stress amplitude thereof and the schematic diagram of displacement width distribution.
Fig. 5 is the structural representation of Shimadzu USF-2000 Ultrasonic Fatigue Test-Bed.
Wherein: transducer 1, displacement amplifier 2, Specimen for Fatigue Test at Ultrasonic Frequency 3, cooling air nozzle 4, ultrasonic generator 5 and be System controls software 6
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As Fig. 1～2 show that conventional Ultrasound fatigue test method used containing transition arcs cylindrical sample with containing breach The structural representation of cylindrical sample.
As it is shown in figure 5, be the USF-2000 Ultrasonic Fatigue Test-Bed of Shimadzu Corporation of Japan production, its resonant frequency is 20KHz.This Ultrasonic Fatigue Test-Bed is mainly by transducer 1, displacement amplifier 2, cooling air nozzle 4, ultrasonic generator 5 and be System controls software 6 and forms.Wherein, the signal of telecommunication of 50Hz is converted to the ultrasonic sinusoidal wave signal of telecommunication of 20KHz by ultrasonic generator 5, The amplitude of sine wave is changed by adjusting voltage；The signal of telecommunication that ultrasonic generator 5 provides is converted into mechanical vibration by transducer 1 Signal；Displacement amplifier 2 amplifies the vibration displacement amplitude from transducer, makes Specimen for Fatigue Test at Ultrasonic Frequency 3 obtain required displacement and shakes Width, cooling air nozzle 4 is for cooling down Specimen for Fatigue Test at Ultrasonic Frequency 3.One end of Specimen for Fatigue Test at Ultrasonic Frequency 3 is fixed on displacement equations The bottom of device 2, the other end is freely.
As a example by certain engineering steel, use Shimadzu USF-2000 Ultrasonic Fatigue Test-Bed to carry out Ultrasonic fatigue testing, pass through Uiform section cylindrical sample Ultrasonic fatigue testing method equal cross section cylindrical sample provided by the present invention carries out ultrasonic fatigue Specifically comprising the following steps that of test
1) specimen size is designed.Presetting axial push-pull sample is uiform section cylindrical sample, as shown in Figure 3.First Measure engineering steel elasticity modulus of materials E=206GPa, density p=7850kg/m3.According to formula:Meter Calculation can obtain the resonance length L=128.07mm of sample.Cylindrical radius arbitrarily can give according to practical situation, drafts cylindrical radius R=4mm.To this uiform section cylindrical sample, the stress range of its test is 51MPa～253MPa.
2) according to parameter L, materials processing is become uiform section cylindrical ultrasound fatigue testing specimen by R, polishes specimen surface, reaches light Cleanliness Ra=0.32.
3) sample processed is fixed in Ultrasonic Fatigue Test-Bed displacement amplifier, adjusts cooling air nozzle, right Position, quasi-sample middle, opens valve, cooling samples, as shown in Figure 5.
4) open ultrasonic fatigue system controlling software, choose containing transition arcs cylindrical sample type, draft containing transition arcs circle Cylindricality specimen size parameterHumorous by the following cylindrical sample containing transition arcs Length of shaking analytic formula:
L 2 0 = 1 k a r c t a n { 1 k &lsqb; &beta; tanh ( &beta;L 1 0 ) - &alpha; tanh ( &alpha;L 1 0 ) &rsqb; }
Or tried to achieve the resonance length containing transition arcs cylindrical sample by Ultrasonic Fatigue Test-Bed system controlling software 6
5) stress amplitude σ that cross section cylindrical sample needs to load is draftedmax=200MPa, according to draft containing transition arcs The dimensional parameters of cylindrical sample With uiform section circle The dimensional parameters L=128.07mm of cylindricality sample, stress transmission formula beTry to achieve The stress amplitude needing loading containing transition arcs cylindrical sample corresponding under the displacement amplitude identical with uiform section cylindrical sample
6) in system controlling software, the stress amplitude that the cylindrical sample Han transition arcs is corresponding is inputted Vibration displacement amplitude now is 39.6 μm.σmaxDuring=200MPa, if directly using the cylindrical sample Han transition arcs to try Test, dimensional parameters Containing transition arcs cylinder try The displacement amplitude of sample is 9.85 μm, has exceeded the oscillating region of Ultrasonic Fatigue Test-Bed, and test cannot complete.
7), after setting other every test parameterss in Control System Software, the axial of uiform section cylindrical sample is started Tension and compression Ultrasonic fatigue testing, frequency of vibration is 20kHz, through 1.38 × 106After the circulation of cycle, sample fracture.
Attached: the formulation process in the present invention
1) the size design formula of uiform section cylindrical ultrasound fatigue testing specimen, solving can be effectively at Ultrasonic fatigue testing The size of the uiform section cylindrical ultrasound fatigue testing specimen of resonance resonance is there is on machine.
A. drafting R data, R is the radius of cylinder；
B. the resonance length L of uiform section cylindrical sample is calculated.According to continuous system Theory of Vibration, material meets preferable bullet Gonosome condition, as it is shown on figure 3, the end points that Assumed coordinate initial point is sample axis, materialses axially for x-axis.(x, t) for sitting for U Cross section at mark x is in the extensional vibration displacement of t.The sample longitudinal wave equation when resonance is:
&part; 2 U &part; x 2 = 1 c 2 &part; 2 U &part; t 2 - - - ( 1 )
Wherein,
C is resonance wave propagation rate in test material, and E is the elastic modelling quantity of sample, and ρ is the density of material.
In formula,For to function U (x, t) derivation,For to x second order derivation,For to t second order derivation.Formula (1) General solution is
U = &Sigma; n = 1 &infin; U n ( x , t ) - - - ( 3 )
In formula,
Wherein, n is natural number, the resonance length of L uiform section cylindrical sample.
The boundary condition of Ultrasonic fatigue testing requires the vibration displacement amplitude maximum in the cross section, both ends of sample, correspondence Answer vanishing, it may be assumed that
( &part; U &part; x ) x = 0 , L = 0 - - - ( 5 )
To single order mode of oscillation, formula (4) is: U (x, t)=Umaxcos(kx)sin(wt) (6)
Wherein, Umax=U |X=L, it is the displacement amplitude of sample free end, is also the maximum displacement amplitude of sample.
k = n &pi; L , &omega; = n &pi; c L , n = 1 - - - ( 7 )
At sample axial coordinate x, the vibration displacement width of cross section is:
U (x)=A0cos(kx) (8)
The natural frequency of Specimen for Fatigue Test at Ultrasonic Frequency is identical with ultrasonic fatigue vibrational system frequency, is f, then angular velocity of vibration ω =2 π f (9)
When can be f in the hope of natural frequency by formula (2), formula (7) and formula (9), the resonance length of sample be:
L = 1 2 f E &rho; - - - ( 10 )
F is frequency of vibration, and value is 20kHz here.
By formula (10) it can be seen that the resonance length of uiform section cylindrical ultrasound sample is unrelated with its body diameter, only with The elastic modelling quantity of material is relevant with density.
2) derivation uiform section cylindrical sample and containing the stress transmission formula between transition arcs cylindrical sample, this formula will The stress transmission of uiform section cylindrical ultrasound fatigue testing specimen becomes the cylindrical sample containing transition arcs on system controlling software corresponding Stress, to realize utilizing existing equipment and software to control this mesh to complete uiform section cylindrical sample Ultrasonic fatigue testing 's.
Ultrasonic fatigue testing technology is by Control Assay end displacement amplitude, realizes Control Assay stress amplitude.And Transducer voltage is linear relationship with the vibration displacement width of outfan, and after given sample end displacement amplitude, ultrasonic fatigue tries Machine of testing adjusts displacement amplitude by changing the voltage of transducer.Therefore, to given stress amplitude σmaxSample, first have to Obtain vibration displacement amplitude U of its correspondencemax。
Stress distribution function σ (x) of described uiform section cylindrical ultrasound fatigue testing specimen can be by displacement width function U X () derivation obtains:Its maximum stress width in the sample between cross sectionPlace.Try to achieve uiform section cylinder The maximum stress width of shape sample is:
&sigma; m a x = E &part; U ( x ) &part; x | x = L 2 = E &pi; L U m a x - - - ( 11 )
Wherein, E is the elastic modelling quantity of sample, and L is the resonance length of uiform section cylindrical sample.
For the uiform section cylindrical sample shown in Fig. 3, first record its physical parameter elastic modulus E and density p, root Trying to achieve its resonance length L according to size design formula (10), the stress amplitude that drafting needs to load is σmax, can be in the hope of by formula (11) Obtain uiform section cylindrical sample stress amplitude σmaxCorresponding displacement amplitude
Fig. 4 show in USF-2000 Ultrasonic Fatigue Test-Bed system controlling software containing transition arcs cylindrical sample.Intend FixedData,The radius the most carefully located for the cylindrical sample containing transition arcs,For cylinder at sample two ends Radius,Half for sample transition arcs segment length.So resonance length containing transition arcs cylindrical sampleCan be by system Control software to be automatically given, it is also possible to be given by the resonance length analytic formula containing transition arcs cylindrical sample:
L 2 0 = 1 k a r c t a n { 1 k &lsqb; &beta; tanh ( &beta;L 1 0 ) - &alpha; tanh ( &alpha;L 1 0 ) &rsqb; } . - - - ( 12 )
In formula,ρ is sample material Density, E is the elastic modelling quantity of sample material, and f is sample frequency of vibration.
Stress distribution function σ containing transition arcs cylindrical sample0X () is by obtaining, shown in Fig. 4 its displacement function derivation Containing transition arcs cylindrical sample maximum stress widthCross section (x=0) place between in the sample:
Wherein, E is the elastic modelling quantity of sample material, UmaxFor the maximum displacement amplitude of sample, k = 2 &pi; f / E &rho; .
When sample analytical Calculation, for ease of calculating, it is assumed that the cylindrical sample variable cross-section section curve containing transition arcs is stretched wire Line, but machining has been difficult to, and generally adds man-hour actual, substitutes catenary curved surface with circular arc camber, by WithCan be in the hope of containing transition arcs cylindrical sample variable cross-section section transition arcs radiusBased on this Transformational relation, respectively relates toWithFormula in, one of them amount can be converted to R0, thus obtain different public affairs Formula, its formula provided with the present invention is substantially equal to.
From formula (13), in order to make the displacement amplitude of uiform section cylindrical sample be Umax, need to draft containing transition arcs cylinder Shape sample is at the displacement amplitude U identical with uiform section cylindrical samplemaxThe stress amplitude of lower correspondenceFor:
Formula (14) is uiform section cylindrical sample and containing the stress transmission formula between transition arcs cylindrical sample, formula In, σmaxFor the stress amplitude of uiform section cylindrical sample,For corresponding trying containing transition arcs cylinder under same displacement amplitude The stress amplitude of sample, L is the resonance length of uiform section cylindrical sample,
Owing to the displacement amplitude scope of Ultrasonic Fatigue Test-Bed is generally 10 μm～50 μm, convolution (10), (11) Understanding, be E to elastic modelling quantity, density is ρ uiform section cylindrical sample, and proof stress amplitude range is

Claims (8)

1. a uiform section cylindrical sample Ultrasonic fatigue testing method, it is characterised in that: comprise the steps:
1) size of the uiform section cylindrical sample that resonance occurs under frequency f is determined,
Determine the resonance length L of uiform section cylindrical sample the most as follows:
L = 1 2 f E &rho; ,
Wherein, f is ultrasonic fatigue system frequency, and ρ is the density of test material, and E is the elastic modelling quantity of test material；
B. the radius R of uiform section cylindrical sample is drafted；
2) according to the resonance length L and radius R of the uiform section cylindrical sample obtained, materials processing become uiform section cylinder try Sample, and specimen surface is polished；
3) the uiform section cylindrical sample processed is fixed in the displacement amplifier (2) of Ultrasonic Fatigue Test-Bed；
4) opening ultrasonic fatigue system controlling software, choosing specimen types is containing transition arcs cylindrical sample, determines that frequency f issues The dimensional parameters containing transition arcs cylindrical sample of raw resonance:WithWhereinThe most carefully locate for sample Radius,For the radius of cylindrical section at sample two ends,For the half of sample transition arcs segment length,For sample one end cylinder The length of section；
5) stress amplitude σ that uiform section cylindrical sample needs to load is draftedmax, try to achieve as follows with uiform section cylinder The stress amplitude needing loading containing transition arcs cylindrical sample corresponding under the displacement amplitude that shape sample is identical
Wherein,
6) in ultrasonic fatigue system controlling software, input needs the stress amplitude loaded containing transition arcs cylindrical sample
7), after setting other every test parameterss in Control System Software, the axial push-pull of uiform section cylindrical sample is started Ultrasonic fatigue testing, until sample fracture.
Uiform section cylindrical sample Ultrasonic fatigue testing method the most according to claim 1, it is characterised in that: step 2) In, surface roughness R after polishing specimen surfacea≤0.4。
Uiform section cylindrical sample Ultrasonic fatigue testing method the most according to claim 1, it is characterised in that: step 4) In, the dimensional parameters containing transition arcs cylindrical sample determines by the following method:
1) draft
2)Automatically be given by Ultrasonic Fatigue Test-Bed system controlling software.
Uiform section cylindrical sample Ultrasonic fatigue testing method the most according to claim 1, it is characterised in that: step 4) In, the dimensional parameters containing transition arcs cylindrical sample determines by the following method:
1) draft
2)It is calculated by below equation:
L 2 0 = 1 k arctan { 1 k &lsqb; &beta; tanh ( &beta;L 1 0 ) - &alpha; tanh ( &alpha;L 1 0 ) &rsqb; }
In formula,ρ is the close of sample material Degree, E is the elastic modelling quantity of sample material, and f is sample frequency of vibration.
5., according to the uiform section cylindrical sample Ultrasonic fatigue testing method according to any one of Claims 1 to 4, its feature exists In: during Ultrasonic fatigue testing, registration coupon centre position winding-up cold air is to cool down uiform section cylindrical sample.
6., according to the uiform section cylindrical sample Ultrasonic fatigue testing method according to any one of Claims 1 to 4, its feature exists In: during Ultrasonic fatigue testing, spray water to cool down uiform section cylindrical sample in registration coupon centre position.
7., according to the uiform section cylindrical sample Ultrasonic fatigue testing method according to any one of Claims 1 to 4, its feature exists In: it is-1 that the method is applied to stress ratio, the axial push-pull Ultrasonic fatigue testing of frequency of vibration f=15～30KHz.
8., according to the uiform section cylindrical sample Ultrasonic fatigue testing method according to any one of Claims 1 to 4, its feature exists In: step 5) in, draft stress amplitude σ that uiform section cylindrical sample needs to loadmaxIn the range of
CN201610340473.5A 2016-05-20 2016-05-20 Ultrasonic fatigue testing method of cylindrical sample with uniform cross sections Pending CN106053608A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106644718A (en) * 2016-12-20 2017-05-10 武汉钢铁股份有限公司 Method for detecting micro defect inside metal material
CN109765129A (en) * 2019-03-22 2019-05-17 吉林大学 A kind of resonator system of achievable multi-axis ultrasonic fatigue test
CN110231402A (en) * 2019-05-22 2019-09-13 张博湉 A kind of Container inspection system method and device
CN110345655A (en) * 2019-07-08 2019-10-18 马鞍山钢铁股份有限公司 Cooling device and cool-down method for the cooling of HF fatigue testing machine sample
CN110609052A (en) * 2019-08-26 2019-12-24 武汉钢铁有限公司 Method and device for predicting fatigue life of cylindrical metal material and electronic equipment
CN110609052B (en) * 2019-08-26 2022-06-07 武汉钢铁有限公司 Method and device for predicting fatigue life of cylindrical metal material and electronic equipment

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