CN108613871A - A kind of device and method of ultrasonic wave assisting tension - Google Patents
A kind of device and method of ultrasonic wave assisting tension Download PDFInfo
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- CN108613871A CN108613871A CN201810247690.9A CN201810247690A CN108613871A CN 108613871 A CN108613871 A CN 108613871A CN 201810247690 A CN201810247690 A CN 201810247690A CN 108613871 A CN108613871 A CN 108613871A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The present invention relates to the researchs of material stretching experiment, are espespecially directed to the device and method that hard metal carries out a kind of ultrasonic wave assisting tension of tired stretching using ultrasonic wave；The stretching device is in integrally that vertical direction assembles, mainly including the same supersonic generator of two parameters, the identical connecting rod stretching structure of two nested structures, it is mounted on amplitude transformer on connecting rod stretching structure, assemble workpiece in amplitude transformer one end, other end is electrically connected by energy converter and supersonic generator so that supersonic generator is by ultrasonic wave electrical energy transportation to ultrasonic transducer；The ultrasonic tensioning system of the present invention can simulate severe workpiece Service Environment, and having carried out unidirectional and biaxial tension to workpiece tests, and the extension mechanism of military service workpiece crackle under the effect of ultrasonic vibration uniaxial or biaxial stretching load has been obtained in conjunction with data analysis.
Description
Technical field
The present invention relates to the researchs of material stretching experiment, are espespecially directed to hard metal and carry out tired stretching using ultrasonic wave
A kind of device and method of ultrasonic wave assisting tension.
Background technology
Aluminium alloy and steel are all important industrial materials, are especially widely used in aviation aerospace industry, aluminium alloy quilt
Skin, load-carrying construction and securing member for making aircraft, rocket, the load suffered by modern mechanical structure and environment
Condition is very harsh, but higher and higher for reliability of structure, security requirement, wherein requiring the tired longevity being on active service safely
Life is also increasingly longer.Additionally, because the reason of aerodynamics and machine operation vibrate, structure also often faces acoustic fatigue or super
The threat of acoustic fatigue, alternate stress caused by this vibration can seriously affect the bearing capacity of these components, component materials
It will appear " softening " behavior, so when designing and checking this base part, just cannot be carried out according to conventional thinking, it must be understood that institute
The various mechanical performance indexs of design part material in this case.For these reasons, our schools voluntarily have studied one
Kind of Ultrasonic fatigue testing device and method, hard metal carry out supersonic frequency (20-40kHz), high such as aluminium alloy or steel
The fatigue behaviour of cycle (N=105~1010) is studied, to predict that other metal materials are exerted oneself in ultrasonic vibration simple tension
Learn the variation tendency of performance indicator.Experiment before has carries out simple tension vibration test to material, but sometimes workpiece is taking
When labour, force environment is not single, so one directional tensile test is difficult to simulate worse Service Environment.
Invention content
The present invention is for the deficiency for carrying out Service Environment simulation test to metal material at present, it is desirable to provide one kind can be right
The device and method that material carries out biaxial tension, espespecially a kind of device and method of ultrasonic wave assisting tension.
The technical solution adopted by the present invention is：A kind of ultrasonic wave assisting tension device, the stretching device are in integrally perpendicular
Histogram is to assembly, mainly including the same supersonic generator of two parameters, the identical connecting rod stretching structure of two nested structures, connecting rod
Amplitude transformer is mounted on stretching structure, workpiece is assembled in amplitude transformer one end, and other end passes through energy converter and supersonic generator
It is electrically connected so that supersonic generator is by ultrasonic wave electrical energy transportation to ultrasonic transducer.
The supersonic generator output power is more than 3000W, and frequency adjustable extent is the ultrasound of 20KHz~40KHz
Wave source.
The energy converter uses electrostrictive transducer, and the supersonic frequency electric oscillation signal that supersonic generator is generated turns
Change supersonic frequency mechanical oscillation into.
The amplitude transformer uses stretched wire type amplitude transformer.
The connecting rod stretching structure includes fixed plate and adjustable plate, is connected by adjusting bolt between fixed plate and adjustable plate
It connects, the displacement of adjustable plate in the vertical direction is adjusted by debugging the position on adjusting bolt vertical direction.
Amplitude transformer is equipped on the adjustable plate, adjustable plate drives amplitude transformer to be moved in the vertical direction so that being assemblied in
Workpiece in amplitude transformer carries out the stretching on vertical direction.
One of stretching device amplitude transformer is equipped with workpiece one end to be measured, and the assembly of another amplitude transformer waits for
The other end of workpiece is surveyed, starts supersonic generator and brings the vibration on vertical direction to workpiece, while debugging two connecting rods
Adjusting bolt on stretching structure is realized carries out biaxial tension to workpiece.
The amplitude transformer in the lower orientation of the stretching device is equipped with workpiece one end to be measured, starts supersonic generator to work
Part brings the vibration on vertical direction, debugging adjusting bolt to carry out simple tension to workpiece.
A kind of method of ultrasonic wave assisting tension, the drawing process mainly include the following steps that：
Step 1: preparing supersonic generator：The environmental parameter that the material and material tested as needed use in advance is selected
Supply voltage is 220V, frequency 50Hz, peak power output 3000W, and frequency adjustable extent is the ultrasound of 20KHz~40KHz
Wave source；
Step 2: processing test piece：The small ladder shaft-like in the big centre in both ends is worked the work piece into, the big multi-diameter shaft in both ends loads
In the amplitude transformer of ultrasonic vibration stretching device, convert to obtain the theoretical fracture position of workpiece by mechanics, and mark.
Step 3: carrying out simple tension vibration performance test to workpiece：Workpiece is grouped, every group has 6-8 workpiece,
One end of wherein six groups workpiece is loaded in the amplitude transformer on lower orientation connecting rod stretching structure, supersonic generator is started, into
Row single vibration performance test；
Step 4: carrying out biaxial tension vibration performance test to workpiece：Wherein one end of six groups of workpiece is loaded in lower orientation to connect
In amplitude transformer on bar stretching structure, other end is assemblied in the amplitude transformer on upper position connecting rod stretching structure, super by two
The output of sonic generator is tuned into unanimously, while starting two supersonic generators, carries out the test examination of biaxial tension vibration performance
It tests；
Step 5: analysis of Fatigue-life：S-N curves are obtained by stretching, the S-N for more particularly obtaining different workpieces is bent
Line, S-N curves show the phenomenon of typical ultrasonic fatigue or high cycle fatigue, and analysis Al alloy parts are in how many fatigues
Fatigue fracture occurs in cycle section, and application scanning electron microscope examines the fatigue fracture of workpiece, to divide
Analyse crack initiation and the extension mechanism of fatigue crack；
Step 6: stress variation is analyzed：According to obtained stress strain curve is tested, finite element simulation is carried out to the model established
Analysis, has shown that workpiece is answered in ultrasonic vibration uniaxial or biaxial stretching at the distribution map of internal stress and workpiece centre point
The version of power.
The beneficial effects of the invention are as follows：The ultrasonic tensioning system of the present invention can simulate severe workpiece Service Environment, right
Workpiece has carried out unidirectional and biaxial tension experiment, has obtained military service workpiece in the one-way or bi-directional drawing of ultrasonic vibration in conjunction with data analysis
Stretch the extension mechanism of the lower crackle of load effect.
Description of the drawings
Fig. 1 is the structural schematic diagram of ultrasonic wave assisting tension device in the present invention
Attached drawing marks explanation：1- supersonic generators, 2 connecting rod stretching structures, 3- amplitude transformers, 4- energy converters, 21- fixed plates, 22-
Adjustable plate, 23- adjusting bolts.
Specific implementation mode
Below in conjunction with the Figure of description specific implementation mode that the present invention will be described in detail：
Refer to the distortion property of material generally to the discussion of material constitutive relation, therefore involved in the discussion of constitutive relation
Be equivalent shear stress and equivalent shearing strain, that is, the deviator part of stress and strain tensor, and to stress and strain tensor
Ball amount part research then belong to the equation of state research range；Meanwhile tension test is the various mechanics parameters of research material
One of most common method, in order to study constitutive relation of the metal material under Action of Superhigh Frequency Vibration and each mechanical property parameters compared with
Normality stretch lower situation of change, ultrasonic activation is applied on workpiece 5 by the application, the examination of progress ultrasonic wave assisting tension
It tests, obtains the mechanical characteristic situation of material, tension tests mainly are carried out to No. 2219 aluminium alloys or No. 20 steel in the application, 2219
Number aluminium alloy is usually used in space rocket welding oxidant slot, supersonic plane covering and constitutional detail, and the operating temperature of normality is-
270 ~ 300 DEG C, weldability is good, and fracture toughness is high；No. 20 steel belong to high-quality low-carbon carbon steel, cold extrusion, carburizing hardened steel, the steel
Intensity is low, and toughness, plasticity and weldability are good, tensile strength 253-500MPa, and elongation >=24%, No. 20 steel is suitable for system
It makes and builds the parts, such as automobile such as not too important middle-size and small-size carburizing carbo-nitriding in automobile, tractor and common mechanical manufacturing industry
On parking brake shoe plate, lever shaft, gearbox speed fork, transmission driven gear and tractor upper camshaft, suspension balanced device axis, equilibrium
External bushing etc. in device；Stress is little for manufacturing under hot rolling or normalized condition, and the various machine components for requiring toughness high；
In weight, medium-sized machinery manufacturing industry, such as the pull rod of forging or compacting, shackle, lever, sleeve, fixture.In steam turbine and boiler system
It makes and is chiefly used in pressure≤6N/ squares in industry, the pipe that works in the non-corruption medium of temperature≤450 DEG C, flange, header and various
Fastener；For manufacturing the casting such as crosshead, piston on railway, rolling stock, so being done to both materials unidirectional or double
Research significance is had to tension test.
The application mainly in uniaxial or biaxial stretching experiment, passes through grinding to the stress-strain diagram obtained by experiment
Study carefully, discloses the changing rule of aluminum alloy materials each performance parameter under ultrasonic vibration, and in terms of fracture mechanics and finite element numerical
Calculation method is theoretical foundation, using the fatigue life for stretching obtained S-N tracing analysis aluminum alloy materials, and utilizes maturation
General finite element software ANSYS and data processing software matlab analysis aluminum alloy materials there is " softening " mechanism.
As shown in Figure 1, the application devises a set of ultrasonic vibration stretching that can be carried out at the same time simple tension and biaxial tension
Device, stretching device include mainly the same supersonic generator 1 of two parameters, the identical stretching connecting rod stretching knot of two nested structures
Structure 22 is equipped with amplitude transformer 3 on connecting rod stretching structure 22, and amplitude transformer 3 is electrically connected by energy converter 4 and supersonic generator 1,
Make supersonic generator 1 by ultrasonic wave electrical energy transportation to ultrasonic transducer 4；The effect of energy converter 4 is by supersonic generator 1
The supersonic frequency electric oscillation signal of generation is converted into supersonic frequency mechanical oscillation, and the application is using electrostrictive transducer 4；It is described
Connecting rod stretching structure 2 include fixed plate 21 and adjustable plate 22, connected by adjusting bolt 23 between fixed plate 21 and adjustable plate 22
It connects, the displacement of adjustable plate 22 in the vertical direction is adjusted by debugging the position on 23 vertical direction of adjusting bolt；Described
Amplitude transformer 3 is equipped on adjustable plate 33, adjustable plate 22 drives amplitude transformer 3 to be moved in the vertical direction so that being assemblied in amplitude transformer 3
In workpiece 5 carry out vertical direction on stretching；One of stretching device amplitude transformer 3 is equipped with workpiece 5 to be measured
One end, another amplitude transformer 3 assemble the other end of workpiece for measurement 5, start supersonic generator 1 and are brought vertically to workpiece 5
Vibration on direction, while debugging the adjusting bolt 23 on two connecting rod stretching structures 2 and realizing to the progress biaxial tension of workpiece 5；
The amplitude transformer 3 in the lower orientation of the stretching device is equipped with 5 one end of workpiece to be measured, starts supersonic generator 1 to workpiece band
Carry out the vibration on vertical direction, debugging adjusting bolt 23 carries out simple tension to workpiece.
Embodiment one carries out ultrasonic wave assisting tension experiment to No. 2219 aluminium alloys
Step 1: preparing supersonic generator 1：The environmental parameter that the material and material tested as needed use in advance is selected
Supply voltage is 220V, frequency 50Hz, peak power output 3000W, and frequency adjustable extent is the ultrasound of 20KHz~40KHz
Wave source.
Supersonic generator 1 is also known as ultrasonic frequency generator, is supplied with the energy of the ultrasonic electric energy of ultrasonic transducer 4, effect
It is that alternating current is changed into the output of supersonic frequency electrical power, vibrates required energy to provide the workpiece 5 when ultrasonic vibration stretches.
It is mainly made of parts such as oscillator, voltage amplifier, power amplifier and output transformers.Wherein, oscillator is ultrasound
The heart of wave producer 1.In order to ensure the frequency stabilization of supersonic generator 1, the impedance matching of generator and energy converter 4, most
The supersonic generator 1 closely developed is also equipped with acoustic tracking circuit and frequency automatic tracking circuit.
Although the 1 model H66MC of supersonic generator of the generally use in tension test of technology before, supply voltage
220V, frequency 50Hz, output power are more than 250W, and frequency adjustable extent is 18KHz~22KHz, in practice it has proved that, this ultrasound hair
Although raw device performance is stablized, power is low, it is difficult to reach the environment that really simulate and use, so obtained data reference valence
Value is little.
The supersonic generator 1 of the application is to make to measure, no concrete model, and purpose is exactly in order to mould to greatest extent
Quasi- use environment so that test data has a reference value, 1 forward power of supersonic generator of the application is big, it is small, at
This is low, degree of intelligence is high, can show frequency of oscillation, has micro-processor controlled acoustic tracking circuit and frequency automatic tracking circuit and height
Reliability, emphasis are to carry out uniaxial or biaxial stretching to workpiece 5, and experiment before is all that can only unidirectionally be drawn workpiece 5
It stretches, while to make generator and energy converter 4 match in the present embodiment, so as to generator efficiency highest, 3 amplitude of amplitude transformer is most
Greatly, it has been tested and used, 1 output power of supersonic generator in the present embodiment has reached corresponding technical indicator；Frequency
Stablize, and can continuously adjust within the required range, there is automatic frequency tracking system；The output impedance of generator should be with energy converter 4
Matches impedances, during the test, almost without resonant frequency drift phenomenon, amplitude without reduction, meets use environment substantially
Simulation, test data is with a high credibility.
Step 2: processing test piece 5：It is processed into the small ladder shaft-like in the big centre in both ends using No. 2219 aluminium alloys, two
Big multi-diameter shaft is loaded in the amplitude transformer 3 of ultrasonic vibration stretching device, is converted to obtain the theoretical of workpiece 5 by mechanics and is broken
Position, and mark.
The shape of workpiece 5 is not limited to the small ladder shaft-like in the big centre in both ends, can be processed into required various workpiece 5
Shape, such as dumbbell shaped or other required shapes, as long as ensureing that drawing force cannot influence ultrasonic vibration stretching device
Vibrating effect, while ultrasonic vibration stretching device can not influence the effect that workpiece 5 is stretched, it is two-way when being carried out to workpiece 5
The experiment of stretching is that the output frequency of two sets of supersonic generators 1 can be the same or different, and in addition adjusts the wave of ultrasonic wave
Peak is located at the theoretical fracture position of workpiece 5.
Step 3: carrying out simple tension vibration performance test to workpiece 5：Workpiece 5 is grouped, every group has 6-8 work
One end of wherein six groups workpiece 5 is loaded in the amplitude transformer 3 on lower orientation connecting rod stretching structure 22 by part 5, starts ultrasonic wave hair
Raw device 1, carries out single vibration performance test, and in six groups of workpiece 5, every group of workpiece 5 carries out the stretching under different frequency respectively
It tests, the stretching of one group of workpiece 5 is completed under each frequency, to select rational curve, test data is drawn with ball-and-socket hinge style
Instrument is stretched to measure using method of addition；Test temperature is 280 DEG C, and experiment loading velocity is 15mm/min, due to being drawn in ultrasonic activation
It stretches in experiment, workpiece 5 can heat up fever, and since the frequency vibrated and stretched is larger, heating can be very fast, therefore uses simultaneously air-cooled
With the cooling method of water cooling, i.e., during stretching experiment, the cold wind come out using compressor compresses is incessantly toward on workpiece 5
Blowing, while intermittently toward spraying water on workpiece 5.
Ultrasonic amplitude transformer 3, also known as ultrasonic gear lever, ultrasound amplification bar, supersonic concentrator, are the key that ultrasonic vibration systems
One of part, including electrostriction and magnetostrictive transducer 4, the dilatation very little under high-frequency electrical oscillation action, even if
Under resonant conditions, there was only 4 μm~5 μm from the directly getable amplitude maximum of energy converter 4, and in order to reach most apparent ultrasound
Vibration drawing effect, it is desirable that the amplitude of tool will at least reach 10~20 microns, be necessarily required in this way in energy converter 4 and processing
Increase Amplitude amplification part, i.e. amplitude transformer 3 between tool, there are two the main functions of amplitude transformer 3：First, by the position of mechanical oscillation
It moves or velocity amplitude amplifies, or energy is concentrated on smaller radiating surface, i.e. cumulative action；Another functions as machine
The converter of tool impedance makes ultrasonic energy from ultrasonic transducer 4 more effectively to load transmission, due to the material of the application experiment
It is solid, during needing certain static pressure, especially Ultrasonic machining at work, machining tool is constantly worn, and is at this moment born
Load changes greatly, thus the requirement to amplitude transformer 3 also requires job stability other than having sufficiently large amplification coefficient
Height has enough bending stifiness, so using stretched wire type amplitude transformer 3.
Step 4: carrying out biaxial tension vibration performance test to workpiece 5：Wherein one end of six groups of workpiece 5 is loaded in down
In amplitude transformer 3 on orientation connecting rod stretching structure 22, other end is assemblied in the amplitude transformer 3 on upper position connecting rod stretching structure 22
In, the output of two supersonic generators 1 is tuned into unanimously, while starting two supersonic generators 1, carries out biaxial tension and shake
Dynamic performance test, in six groups of workpiece 5, every group of workpiece 5 carries out the tension test under different frequency respectively, under each frequency
The stretching for completing one group of workpiece 5, to select rational curve, test data is surveyed with ball-and-socket hinge style tens(i)ometer using method of addition
.
Test temperature is 280 DEG C, and experiment loading velocity is 15mm/min, due in ultrasonic activation stretching experiment, work
Part 5 can heat up fever, and since the frequency vibrated and stretched is larger, heating can be very fast, therefore uses air-cooled and water cooling drop simultaneously
Warm mode, i.e., during stretching experiment, the cold wind come out using compressor compresses is incessantly toward 5 up-draught of workpiece, simultaneously
Intermittently toward spraying water on workpiece 5.
Step 5: analysis of Fatigue-life：S-N curves are obtained by stretching, more particularly obtain the S-of different workpieces 5
N curves, S-N curves show the phenomenon of typical ultrasonic fatigue or high cycle fatigue, and analysis Al alloy parts 5 are how many
Fatigue fracture occurs in tired cycle section, and application scanning electron microscope examines the fatigue fracture of workpiece 5,
With the crack initiation of fatigue analysis crackle and extension mechanism；It in experiment, is found by scanning electron microscope, No. 2219 aluminium alloys are normal
State stretching fracture and ultrasonic stretching fracture are obviously different, and ultrasonic stretching fracture shows more obviously to mould than normality stretching fracture
Property Fracture Characteristics, the presence of plastic fracture feature illustrates that material is implicitly present in " softening " phenomenon, with material in ultrasonic stretching action
The variation of lower mechanical property is consistent, and the variation of power and frequency can also cause the difference of fracture apperance, disconnected in conjunction with stretching
Degree of lip-rounding looks signature analysis and crackle show that No. 2219 aluminium alloys are stretched in ultrasonic vibration and make in the evolution mechanism of ultrasonic stretching action
" softening " mechanism under is that high frequency high cycle fatigue is destroyed.
Step 6: stress variation is analyzed：According to obtained stress strain curve is tested, finite element is carried out to the model established
Simulation analysis has obtained 5 center of the distribution map of internal stress and workpiece in ultrasonic vibration uniaxial or biaxial stretching of workpiece 5
The version of stress at point；More particularly, by establishing model, with finite element analysis software ANSYS to 5 He of workpiece
The assembly of amplitude transformer 3 carries out model analysis, obtains the resonant frequency of the assembly, and to workpiece 5 under ultrasonic vibration stretching
Stress distribution carried out Computer Simulation, 5 central point stress of clearly 5 stress envelope of workpiece and workpiece can be obtained
Variation tendency, by with workpiece 5 normality stretching under analog result compare and analyze, it was confirmed that ultrasonic wave changes really
Material constitutive relation.
Unidirectional and biaxial tension is carried out using the ultrasonic tensioning system of the application to workpiece 5 to test, combining with theoretical analysis
The extension mechanism of the crackle under the effect of ultrasonic vibration uniaxial or biaxial stretching load is obtained；Obtain No. 2219 aluminium alloys in ultrasound
Vibrate " softening " mechanism under the effect of simple tension load.
The above is only presently preferred embodiments of the present invention, is not intended to limit the scope of the present invention, one's own profession
The technical staff of industry can make some deformations and modification, every technology according to the present invention under the inspiration of the technical program
Essence still falls within the range of technical solution of the present invention to any modification, equivalent variations and modification made by above embodiment
It is interior.
Claims (9)
1. a kind of ultrasonic wave assisting tension device, it is characterised in that：The stretching device is in integrally that vertical direction assembles, mainly
Including the same supersonic generator of two parameters, the identical connecting rod stretching structure of two nested structures, pacify on connecting rod stretching structure
Equipped with amplitude transformer, workpiece is assembled in amplitude transformer one end, and other end is electrically connected by energy converter and supersonic generator so that super
Sonic generator is by ultrasonic wave electrical energy transportation to ultrasonic transducer.
2. a kind of ultrasonic wave assisting tension device according to claim 1, it is characterised in that：The supersonic generator
Output power is more than 3000W, and frequency adjustable extent is the ultrasound source of 20KHz~40KHz.
3. a kind of ultrasonic wave assisting tension device according to claim 1, it is characterised in that：The energy converter is using electricity
Striction transducer is caused, the supersonic frequency electric oscillation signal that supersonic generator generates is converted into supersonic frequency mechanical oscillation.
4. a kind of ultrasonic wave assisting tension device according to claim 1, it is characterised in that：The amplitude transformer is using outstanding
Chain amplitude transformer.
5. a kind of ultrasonic wave assisting tension device according to claim 1, it is characterised in that：The connecting rod stretching structure
It including fixed plate and adjustable plate, is connected by adjusting bolt between fixed plate and adjustable plate, by debugging adjusting bolt side vertically
Upward position adjusts the displacement of adjustable plate in the vertical direction.
6. a kind of ultrasonic wave assisting tension device according to claim 1, it is characterised in that：It is assembled on the adjustable plate
There is amplitude transformer, amplitude transformer is driven to move in the vertical direction for adjustable plate so that the workpiece being assemblied in amplitude transformer carries out vertical direction
On stretching.
7. according to a kind of ultrasonic wave assisting tension device of claim 1-6 any one of them, it is characterised in that：The stretching dress
It one of sets amplitude transformer and is equipped with workpiece one end to be measured, another amplitude transformer assembles the other end of workpiece for measurement,
Start supersonic generator and bring the vibration on vertical direction to workpiece, while debugging the adjusting spiral shell on two connecting rod stretching structures
Bolt is realized carries out biaxial tension to workpiece.
8. according to a kind of ultrasonic wave assisting tension device of claim 1-6 any one of them, it is characterised in that：The stretching dress
The amplitude transformer in the lower orientation set is equipped with workpiece one end to be measured, starts supersonic generator and is brought on vertical direction to workpiece
Vibration, debugging adjusting bolt carry out simple tension to workpiece.
9. a kind of method of ultrasonic wave assisting tension, it is characterised in that：The drawing process mainly includes the following steps that：
Step 1: preparing supersonic generator：The environmental parameter that the material and material tested as needed use in advance is selected
Supply voltage is 220V, frequency 50Hz, peak power output 3000W, and frequency adjustable extent is the ultrasound of 20KHz~40KHz
Wave source；
Step 2: processing test piece：The small ladder shaft-like in the big centre in both ends is worked the work piece into, the big multi-diameter shaft in both ends loads
In the amplitude transformer of ultrasonic vibration stretching device, convert to obtain the theoretical fracture position of workpiece by mechanics, and mark；
Step 3: carrying out simple tension vibration performance test to workpiece：Workpiece is grouped, every group has 6-8 workpiece, by it
In one end of six groups of workpiece be loaded in the amplitude transformer on lower orientation connecting rod stretching structure, start supersonic generator, carry out single
To vibration performance testing experiment；
Step 4: carrying out biaxial tension vibration performance test to workpiece：Wherein one end of six groups of workpiece is loaded in lower orientation to connect
In amplitude transformer on bar stretching structure, other end is assemblied in the amplitude transformer on upper position connecting rod stretching structure, super by two
The output of sonic generator is tuned into unanimously, while starting two supersonic generators, carries out the test examination of biaxial tension vibration performance
It tests；
Step 5: analysis of Fatigue-life：S-N curves are obtained by stretching, the S-N for more particularly obtaining different workpieces is bent
Line, S-N curves show the phenomenon of typical ultrasonic fatigue or high cycle fatigue, and analysis Al alloy parts are in how many fatigues
Fatigue fracture occurs in cycle section, and application scanning electron microscope examines the fatigue fracture of workpiece, to divide
Analyse crack initiation and the extension mechanism of fatigue crack；
Step 6: stress variation is analyzed：According to obtained stress strain curve is tested, finite element simulation is carried out to the model established
Analysis, has shown that workpiece is answered in ultrasonic vibration uniaxial or biaxial stretching at the distribution map of internal stress and workpiece centre point
The version of power.
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| CN111855447A (en) * | 2020-07-30 | 2020-10-30 | 四川大学 | Ultrasonic fatigue stress amplifying device with unified sample size |
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| CN110044722B (en) * | 2019-05-15 | 2022-04-01 | 吉林大学 | Mechanical property testing instrument and method for ultrahigh-temperature high-frequency material |
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| CN111855447A (en) * | 2020-07-30 | 2020-10-30 | 四川大学 | Ultrasonic fatigue stress amplifying device with unified sample size |
| CN112858010A (en) * | 2020-12-09 | 2021-05-28 | 南京航空航天大学 | Ultrasonic vibration tensile test device based on segmented resonance design and design method and application thereof |
| CN112881207A (en) * | 2021-01-12 | 2021-06-01 | 钢铁研究总院 | Method for evaluating ultrahigh cycle fatigue performance of carburizing steel |
| CN113310805A (en) * | 2021-05-28 | 2021-08-27 | 湖北工业大学 | Axial stress measuring device with novel electromagnetic ultrasonic longitudinal transducer |
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