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60 results about "Ultrasonic fatigue" patented technology
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Ultrasonic bending fatigue experimental device
InactiveCN101819114AGuaranteed resonance conditionsAvoid the influence of vibration wavesSubsonic/sonic/ultrasonic wave measurementMaterial strength using steady bending forcesAudio power amplifierResonance
The invention relates to an ultrasonic bending fatigue experimental device, wherein a transducer is positioned in a force transmitter and connected with a connector. The transducer is positioned in the middle of the ultrasonic bending fatigue experimental device; a backing plate and an upper connecting plate as well as a lower connecting plate of the force transmitter are fixedly connected through force transmitting rods. One end of the connector penetrates through the lower connecting plate at the lower end of the force transmitter and is connected with a displacement amplifier, and the other end penetrates through the upper connecting plate and is connected with the transducer. A supporting device is positioned below the displacement amplifier; and a static load force applying device penetrates through the central hole of the backing plate and is fixedly connected with the backing plate. The transducer, the connector, the displacement amplifier and a pressure head form a longitudinal resonance system, and a longitudinal vibration load is transferred to a bending fatigue sample through the pressure head, so that bending vibration is generated by the bending fatigue sample. The position of the supporting point of the bending fatigue sample can be automatically regulated through a positioning guide screw to realize an ultrasonic bending fatigue experiment, the ultrasonic bending fatigue experiments of the samples with different loading loads and different geometrical sizes can be realized, and the ultrasonic bending fatigue experimental device is suitable for carrying out the bending fatigue experiment by utilizing an axial loading ultrasonic fatigue experiment machine.
Owner:NANTONG JINNIU MACHINERY MFR +1
Sub-ultrasonic high-frequency fatigue testing machine
ActiveCN103091184AReduce frequencySmall sizeMaterial strength using repeated/pulsating forcesStress ratioTransformer
The invention discloses a sub-ultrasonic high-frequency fatigue testing machine. An energy converter used as a driving force source, the energy converter, a tested sample and a driven amplitude transformer form a resonance system, and a prearranged static loading mechanism provides static load for a test piece. The energy converter can be a full-wavelength energy converter or a half-wavelength energy converter. The energy converter converts an electric signal into mechanical vibration under the driving of an external alternating voltage, so the whole system is in a resonance state, and the tested sample has resonance vibration and a stress, thereby the fatigue detection can be realized. The energy converter can be a piezoelectric energy converter or a giant magnetostrictive energy converter. The sub-ultrasonic high-frequency fatigue testing machine allows the sub-ultrasonic high-frequency fatigue tests of the test piece under different stress ratios to be carried out according to the system prearrangement state; compared with traditional high-frequency fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantages of simple structure, small volume, test period shortening, high efficiency and energy saving; and compared with present ultrasonic fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantage of reduction of the frequency effect and the dimension effect to the material fatigue performances.
Owner:天津益普科技发展有限公司
Fretting-wear ultrasonic-vibration ultralong-life fatigue test apparatus
ActiveCN102830029ASimple structureEasy to operateInvestigating abrasion/wear resistanceTransformerTransducer
The invention discloses a fretting-wear ultrasonic-vibration ultralong-life fatigue test apparatus. The apparatus comprises an ultrasonic fatigue test device, a fretting wear device (6) and a temperature test device, wherein the ultrasonic fatigue test device comprises a computer system (1), an ultrasonic generator (2) and a piezoelectric ceramic energy transducer (3) which are sequentially connected; the lower end of the piezoelectric ceramic energy transducer (3) is fixedly connected with a amplitude transformer (4); the output end of the amplitude transformer (4) is connected with a cylindrical extension rod (5) coaxial to the amplitude transformer (4); the size of the cross section of the output end of the amplitude transformer (4) is equal to the size of the cross section of the extension rod (5); and the temperature test device comprises a temperature test meter (8). By adopting the above structure, the apparatus has the advantages of experiment design difficulty reduction and high test precision.
Owner:SICHUAN UNIV
Test method for maximum dimensions of non-metallic inclusions in steel-iron material
ActiveCN104007245ASmall sizeFast testAnalysing solids using sonic/ultrasonic/infrasonic wavesPreparing sample for investigationMaximum dimensionSurface layer
The invention discloses a test method for the maximum dimensions of non-metallic inclusions in a steel-iron material. The test method comprises the following steps: a, cutting a specimen blank, namely cutting the specimen blank from the steel-iron material needing to be tested; b, carrying out heat treatment, namely carrying out quenching and tempering treatment on the specimen blank to enable the hardness of the specimen blank to be 45-50 HRC; c, producing a specimen, namely processing and producing the specimen blank into the specimen with a hourglass shape according to the ingredients of the specimen blank, wherein the inherent frequency of the specimen is equal to the working frequency of an ultrasonic fatigue testing machine due to the dimensions of the specimen; d, carrying out surface reinforcing treatment, namely carrying out shot-blasting treatment on the surface of the specimen obtained in the step c to enable the hardened-layer depth of the surface layer of the specimen to achieve 0.2mm; e, carrying out an ultrasonic test, namely carrying out a fatigue test on the specimen on an ultrasonic fatigue tester; and f, measuring the dimensions of inclusions, namely observing the fracture of the specimen after the ultrasonic test, and measuring the dimensions of the non-metallic inclusions on the fracture of the specimen. The maximum dimensions of the non-metallic inclusions, which are measured by adopting the method, are relatively accurate and reliable.
Owner:SOUTHWEST JIAOTONG UNIV
Ultrasonic high-frequency ball wear fatigue test device
InactiveCN105738236AGuaranteed normal loadingRealize the loadMaterial strength using repeated/pulsating forcesInvestigating abrasion/wear resistanceTest sampleSlide plate
The invention discloses an ultrasonic high-frequency ball wear fatigue test device. By the use of an ultrasonic loading mode, the ultra-long cycle fatigue lives of different ball test samples can be tested under the action of a wear load, and the ultra-long cycle fatigue performance of a vibration test piece can be tested under the action of a high-frequency vibrating and rolling wear composite load. A positioning screw drives two ball moving devices to oppositely move in the axial direction; a sliding plate drives an ultrasonic loading device to move along the longitudinal direction of a dovetail groove of a supporting plate, so as to precisely determine a relative position of the ball test sample and the longitudinal vibrating test piece; the longitudinal vibrating test piece bear a longitudinal vibrating high-frequency cyclic load and a rolling wear composite load, so that the ultra-long cycle fatigue performances of different vibrating test piece materials under the action of the composite load can be tested; a longitudinal contact position of the longitudinal vibrating test piece and the ball test sample is adjusted to load vibrating friction displacements with different sizes onto the ball test sample; the ball moving device is connected with a ball clamping device, so that an ultrasonic fatigue test on two ball test samples can be realized at one time.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Specimen size design method for ultrasonic and tension-compression fatigue test of iron-based powder metallurgical material
InactiveCN103714200AEffective resonanceObtain the Law of Fatigue DestructionSpecial data processing applicationsTension compressionElement analysis
The invention discloses a specimen size design method for ultrasonic and tension-compression fatigue tests of iron-based powder metallurgical materials. The specimen size design method comprises: firstly, measuring parameters of the iron-based powder metallurgical material, such as density, modulus of elasticity and the like; secondly, calculating theoretical sizes of specimens in the tension-compression fatigue tests; thirdly, calculating the response frequency which is needed upon material resonance by means of finite element analysis and regarding the theoretical sizes as boundary conditions; fourthly, fine-tuning the sizes of specimens when the response frequency is not matched with ultrasonic vibration frequency until the sizes of specimens are matched with the ultrasonic vibration frequency, so that the sizes of specimens can be used as experiment parameters. The specimen size design method can be used in various iron-based powder metallurgical materials and the testing frequency in ultrasonic fatigue tests can achieve 20 kHz, and accordingly, the feasibility and efficiency of fatigue tests can be improved.
Owner:SOUTH CHINA UNIV OF TECH
Method for simulating high temperature alloy ultra-high cycle fatigue damage
Belonging to the technical field of measuring and testing, the invention relates to ultra-high cycle fatigue of an ultrasonic fatigue test simulation material, and a high temperature alloy ultra-high cycle fatigue damage simulation method adopting a microanalysis technique for studying micromechanical properties and material deformation to conduct damage assessment. In the invention, a neutron diffraction method is employed to test high temperature alloy funnel-shaped sample surface and subsurface residual stress absolute difference, thus obtaining a relation curve of a cycle number and the residual stress absolute difference; utilizing a nanoindentor to test the elastic modulus absolute difference between dendrite arms and dendrites in the material, thus obtaining a relation curve of the cycle number and the elastic modulus absolute difference; and analyzing the crystal deformation condition by electron back scattering diffraction so as to obtain a relation curve of the cycle number and small angle subboundary crystal deformation. Through comprehensive comparison of the three curves, the dominant factors determining high temperature alloy ultra-high cycle fatigue damage can be understood clearly, and the ultra-high cycle fatigue damage condition of similar other alloys can be predicted.
Owner:AVIC BEIJING INST OF AERONAUTICAL MATERIALS
Ultrasonic fatigue test vibration displacement monitoring device
InactiveCN105334268ADoes not affect resonance parametersDoes not interfere with test resultsMaterial analysis using sonic/ultrasonic/infrasonic wavesUsing optical meansResonanceEngineering
The invention discloses an ultrasonic fatigue test vibration displacement monitoring device which is characterized by comprising a calibration table, a laser displacement sensor, a controller and a computer; the laser displacement sensor is connected with the controller and the computer, and the calibration table composes a base, a back plate and a support arm; the base is vertically connected with the back plate, and the support arm is vertically connected with the back plate, is parallel with the base and can move up and down along the back plate to adjust the height; the laser displacement sensor is fixed on the support arm. The ultrasonic fatigue test vibration displacement monitoring device adopts a non-contact manner, the resonance parameter of an ultrasonic fatigue test system is not affect, the test result is not disturbed, and the operation is rapid, simple and convenient.
Owner:武汉钢铁有限公司
High-temperature ultrasonic fatigue in-situ test instrument and test method
ActiveCN110441163AEasy maintenancePrevent surface oxidationMaterial strength using tensile/compressive forcesScientific instrumentEngineering
The invention relates to a high-temperature ultrasonic fatigue in-situ test instrument and a test method, and belongs to the field of a precise scientific instrument. The instrument consists of an integrated frame module, a mechanical loading module, a high temperature loading module and an in-situ monitoring module, wherein the integrated frame module is used for accurately positioning each functional module and simultaneously providing stable support and effective vibration isolation; the mechanical loading module is used for synchronously exerting static stretching or compression load on two ends of a tested sample and exerting an ultrasonic fatigue load according to test needs and is capable of realizing axial precise positioning; the high temperature loading module is used for exerting a high temperature load on the tested sample; and the in-situ monitoring module is used for performing in-situ monitoring on the surface deformation damage and the internal damage defect of the tested sample. The synchronous representation and three-dimensional reconstruction for the defect information of the tested sample can be implemented from inside to outside and from the exterior to the interior. The high-temperature ultrasonic fatigue in-situ test instrument has the characteristics that the load environment is complex, the test precision is high and meanwhile the material mechanical behavior and deformation damage mechanism can be dynamically monitored.
Owner:JILIN UNIV
Method for detecting micro defect inside metal material
InactiveCN106644718ASolve the defect that can only detect more than 0.5mmIntuitivePreparing sample for investigationMaterial strength using tensile/compressive forcesDefect sizeTest sample
The invention discloses a method for detecting a micro defect inside a metal material. The method comprises the following steps: (1) designing a variable-section ultrasonic fatigue test sample having a circular cross section and containing a constant-section segment according to an elastic modulus and a density value of a metal material to be detected, wherein the size of the test sample is designed according to a following formula: (as shown in the specification); (2) installing the test sample on an ultrasonic fatigue test machine to perform a fatigue test until the test sample is broken; and (3) observing a fracture of the broken test sample, measuring a defect size on the fracture of the test sample, that is a maximum defect size of the metal material. The method can rapidly, intuitively and quantitatively determine the defect in the metal material and can determine the micro defects which are 0.1 mm or smaller and even 10 micrometers or smaller inside the metal material.
Owner:武汉钢铁有限公司
Damage mechanics-based high-strength metal material amplitude variation ultra-high cycle fatigue life predication method
ActiveCN108627406AHigh cycle fatigue performanceClear thinkingAnalysing solids using sonic/ultrasonic/infrasonic wavesMaterial strength using tensile/compressive forcesStress levelMetallic materials
The invention discloses a damage mechanics-based high-strength metal material amplitude variation ultra-high cycle fatigue life predication method. The method is based on an ultra-high cycle fatigue test result and a damage mechanics model, and the high-strength metal material amplitude variation ultra-high cycle fatigue life predication method is provided. The ultrasonic fatigue test is used to rapidly acquire the ultra-high cycle fatigue performance of a high-strength metal material, the test frequency is 20 kHz, only 13.9 hours are needed to finish 109 cycles; based on the nonlinear damagemechanics theory, a damage factor of the amplitude variation stress level is introduced, a material amplitude variation ultra-high cycle fatigue life predication model is established, and the ultra-high cycle fatigue life is quantitatively predicated on amplitude varied load. The thought of the assessment model is clear, and the computation is simple and fast.
Owner:FOSHAN UNIVERSITY
Ultrasonic fatigue testing machine
InactiveCN110411872AMeet different test requirementsAchieving Versatile Fatigue TestingMachine part testingMaterial strength using tensile/compressive forcesControl systemEngineering
The invention relates to a fatigue testing machine, in particular to an ultrasonic fatigue testing machine. The ultrasonic fatigue testing machine comprises a loading system, a control system and a machine cabinet, wherein the loading system is installed in the machine cabinet, the loading system is in signal connection with the control system, a test piece is installed on the loading system, andthe control system controls and monitors fatigue testing of the loading system on the test piece. The loading system comprises a clamp assembly, a static load application assembly and a vibrating assembly, wherein the clamp assembly is detachably installed in the machine cabinet, and used for clamping the test piece; the vibrating assembly is installed in the machine cabinet and connected with thestatic load application assembly, the vibrating assembly applies vibration load to the test piece, and the static load application assembly applies static load to the test piece. The ultrasonic fatigue testing machine has the advantages that multifunctional fatigue testing can be conducted.
Owner:杭州嘉振超声波科技有限公司
Metal ultrasonic fatigue testing method of uniform cross section segment-containing plate-shaped sample
ActiveCN105301113AWide coverageEffective resonanceAnalysing solids using sonic/ultrasonic/infrasonic wavesTension compressionMetallic materials
The invention discloses a metal ultrasonic fatigue testing method of a uniform cross section segment-containing plate-shaped sample. The method comprises the following parts: a first part, firstly, according to density and elastic modulus of a test material, and a dimension designing formula of the uniform cross section segment-containing plate-shaped ultrasonic fatigue sample under a axial tension-compression loading is calculated by analysis; a second part, a stress transformation formula between the uniform cross section segment-containing plate-shaped sample and an arc-shaped sample is derived, a stress of the uniform cross section segment-containing plate-shaped ultrasonic fatigue sample is transformed into a stress corresponding to the arc-shaped sample on a system control software, and a ultrasonic fatigue test control of the uniform cross section segment-containing plate-shaped sample is completed by using existing equipment and software; a third part, a stress correction formula is derived, when a deviation exists between an actual size and a design size of the uniform cross section segment-containing plate-shaped sample, so that more accurate test control is guaranteed. The method is suitable different metal materials, and the cover range is wide; the method can be used for completing an ultra-high cycle fatigue test of the uniform cross section segment-containing plate-shaped sample, upgrade is not needed, and the cost is saved.
Owner:武汉钢铁有限公司
Method for ultrasonic fatigue testing at high temperature, and testing device
InactiveUS20140174184A1Analysing solids using sonic/ultrasonic/infrasonic wavesFluid-tightness measurementRadiation thermometerBlack body
Disclosed are a method for ultrasonic fatigue testing at high temperature and a testing device without needing preliminary Young's modulus measurement, and a method for ultrasonic fatigue testing at high temperature and a testing device capable of securing heat insulation for protecting a vibrator without water cooling of a horn, measuring end surface displacement of a test specimen in a noncontact manner, and solving problems of a noncontact temperature measurement of a test specimen and temperature control. Young's modulus is calculated by inverse calculation, a rod and a horn having heat resistance, heat insulation, and temperature symmetry of a test specimen are used, laser light is irradiated and received from an oblique direction to measure end surface displacement, and a noncontact temperature measurement of a test specimen by a black-body coating and a two-color radiation thermometer and temperature control by a high-frequency coil having a special shape are performed.
Owner:NAT INST FOR MATERIALS SCI
Ultrahigh-temperature high-frequency material mechanical property testing instrument and method
ActiveCN110044722AReduce fatigue test timeImprove accuracyMaterial strength using tensile/compressive forcesMaterial strength using repeated/pulsating forcesFatigue loadingMechanical property
The invention relates to an ultrahigh-temperature high-frequency material mechanical property testing instrument and method and belongs to the field of precision instrument testing. According to the method, a pre-stretching loading module is driven by two servo motors in the vertical direction and realizes adding of a stretching preload to a cross-shaped test piece in the vertical direction; a high-frequency fatigue loading module realizes a mechanical property test on a high-frequency fatigue material of the test piece based on the ultrasonic fatigue experiment principle; a stretching / compression loading module is driven by two horizontally-placed electric actuating cylinders and realizes adding of a stretching / compression complicated load to the cross-shaped test piece; and an ultrahigh-temperature loading module is provided with a low and medium-frequency inductive split heating furnace and realizes ultrahigh-temperature local loading in a test region of the test piece, wherein themaximum loading temperature can reach 1,600 DEG C. The testing instrument and method have the advantages that while a stretching / compression test is performed on the test piece, a high-frequency fatigue test and an ultrahigh-temperature loading environment are additionally arranged, so that the stretching / compression test and the high-frequency fatigue test of the material are more approximate toa real service environment, and the reliability and accuracy of a test result are improved.
Owner:JILIN UNIV
Bed fatigue test controller for light, mechanical and electronic integration medical instrument
InactiveCN106404566AIncrease test frequencyThe test result is accurateMaterial strength using repeated/pulsating forcesImaging analysisEngineering
The invention discloses a bed fatigue test controller for a light, mechanical and electronic integration medical instrument, belonging to the technical field of light, mechanical and electronic integration. The bed fatigue test controller comprises a base, wherein support pillars are respectively arranged on the left side and the right side of the bottom part of the base; support frames are respectively arranged on the left side and the right side of the top part of the base. Compared with an existing bed fatigue test controller for the light, mechanical and electronic integration medical instrument, the bed fatigue test controller for the light, mechanical and electronic integration medical instrument, provided by the invention, adopts ultrasonic fatigue testing; compared with other fatigue testing machines, the test frequency of an ultrasonic fatigue testing machine is larger, so that a test result is more accurate; in addition, on the basis of the existing bed fatigue test controller for the mechanical and electronic integration medical instrument, an image acquisition sub-system and an image analysis sub-system are added, so that a direction and speed of crack propagation of a sample can be analyzed and calculated through real-time monitoring the sample when the sample is subjected to fatigue test, the force analysis is cooperatively carried out on the sample, and thus analyzed data is more accurate.
Owner:天津旁耘科技有限公司
Ultra-high cycle fatigue life forecasting method of high-strength titanium alloy electron beam welding joint
ActiveCN109142529AHigh cycle fatigue lifeWeekly fatigue life avoidanceAnalysing solids using sonic/ultrasonic/infrasonic wavesMetallurgyWelding defect
The invention discloses an ultra-high cycle fatigue life forecasting method of a high-strength titanium alloy electron beam welding joint. According to the method, ultra-high cycle fatigue performances of the high-strength titanium alloy electron beam welding joint are acquired by the aid of an ultrasonic fatigue test, electron beam welding defect size parameters are introduced based on nano-crackpropagation theories, an ultra-high cycle fatigue life loss equation is built, and ultra-high cycle fatigue service lives of high-strength titanium alloy welding structures of different electron beamwelding defects are quantitatively forecasted. The ultra-high cycle fatigue service life loss equation containing electron beam welding defect size parameters is built through the ultrasonic fatiguetest, electron beam welding defect sizes are acquired through metallographic profile or non-destructive inspection, and the ultra-high cycle fatigue service lives of the high-strength titanium alloy welding structures of different electron beam welding defects can be quantitatively forecasted. According to the method, a lot of ultra-high cycle fatigue tests of electron beam welding joints are avoided, ultra-high cycle fatigue service life assessment can be completed, and the method has the advantages of simplicity, rapidness and economical property.
Owner:FOSHAN UNIVERSITY
Ultrasonic fatigue testing machine and ultrasonic fatigue testing method
ActiveUS20150226634A1Appropriate performanceAnalysing solids using sonic/ultrasonic/infrasonic wavesFluid-tightness measurementEngineeringInternal temperature
This ultrasonic fatigue testing machine is one that resonates a test piece by an ultrasonic wave to perform a fatigue test, and configured to include an ultrasonic wave generation part 10, a displacement measurement part 20, and a control part 30 that controls the overall operation of the ultrasonic fatigue testing machine. The control part 30 is configured to have a computer that includes storage devices capable of store programs and various types of data, such as an RAM and an ROM, and an arithmetic unit such as a CPU, and includes an internal temperature estimation part 31, an allowable range setting part 32, and a determination part 33 as a main functional configuration.
Owner:SHIMADZU CORP
Ultrasonic fatigue crack propagation rate measurement method based on inherent frequency
ActiveCN111678990AGuaranteed accuracyEasy to collectAnalysing solids using sonic/ultrasonic/infrasonic wavesStress intensity factorElement analysis
The invention discloses an ultrasonic fatigue crack propagation rate measurement method based on the inherent frequency. The method specifically comprises the following steps: carrying out an ultrasonic fatigue test on a sample material, and acquiring the inherent frequency of the ultrasonic fatigue test in real time; analyzing the fracture of the sample material to obtain a fatigue crack source position of the sample material and obtain a crack source type of the sample material; obtaining a relation formula between the fatigue crack length and the inherent frequency by adopting a finite element analysis method; according to the inherent frequency and a relation formula, obtaining the length of the fatigue crack and the unit length of crack propagation every week; obtaining the maximum stress intensity factor value of the crack tip through the fatigue crack length and the crack source type; and obtaining the ultrasonic fatigue crack propagation rate through the maximum stress intensity factor value of the crack tip and the unit length of crack propagation every week. The relation formula between the fatigue crack length and the inherent frequency is obtained through the finite element analysis method, the crack length can be accurately obtained, and the accuracy of crack propagation rate measurement is guaranteed.
Owner:SICHUAN UNIV
Fretting Friction Ultrasonic Vibration Ultra-Long Life Fatigue Test Device
ActiveCN102830029BSimple structureEasy to operateInvestigating abrasion/wear resistanceThermodynamicsTransformer
The invention discloses a fretting-wear ultrasonic-vibration ultralong-life fatigue test apparatus. The apparatus comprises an ultrasonic fatigue test device, a fretting wear device (6) and a temperature test device, wherein the ultrasonic fatigue test device comprises a computer system (1), an ultrasonic generator (2) and a piezoelectric ceramic energy transducer (3) which are sequentially connected; the lower end of the piezoelectric ceramic energy transducer (3) is fixedly connected with a amplitude transformer (4); the output end of the amplitude transformer (4) is connected with a cylindrical extension rod (5) coaxial to the amplitude transformer (4); the size of the cross section of the output end of the amplitude transformer (4) is equal to the size of the cross section of the extension rod (5); and the temperature test device comprises a temperature test meter (8). By adopting the above structure, the apparatus has the advantages of experiment design difficulty reduction and high test precision.
Owner:SICHUAN UNIV
Method for designing ultrasonic torsion fatigue testing specimen with uniform section
InactiveCN105973983AImprove accuracyRich sample typesAnalysing solids using sonic/ultrasonic/infrasonic wavesTorsion fatigueResonance
The invention proposes a design method for ultrasonic torsional fatigue samples of equal cross-section. First, according to the sample material parameters and geometric design dimensions, the resonance length of the torsional fatigue sample is obtained through the analytical formula of the resonance length of the torsional fatigue sample, and then the resonant length of the torsional fatigue sample is obtained by using the finite element The method analyzes the natural frequency corresponding to the torsional vibration mode of the sample, and corrects the resonant length of the torsional sample according to the analysis results, so that the actual natural frequency of the sample is close to the design frequency within the range of F±0.5kHz, and the equal maximum torsion is obtained in the gauge length section The stress meets the requirements of the ultrasonic torsional fatigue test and improves the accuracy of the test data. The invention enriches the sample types of the ultrasonic fatigue test, expands the application range of the ultrasonic fatigue test method, improves the accuracy of the ultrasonic fatigue test, and lays a foundation for the research on the ultra-high cycle torsional fatigue performance of metal materials.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
A device for testing ultrasonic vibration extra-long life fatigue of a material under a high-pressure state
A device for testing ultrasonic vibration extra-long life fatigue of a material under a high-pressure state is disclosed. A computer system controls electric signals generated by an energy generator (2) to act on a piezoelectric ceramic transducer (3). An amplitude-change pole (5) clamping a sample of the material to be tested is coupled to the piezoelectric ceramic transducer, and can transmit mechanical vibration of the piezoelectric ceramic transducer to the sample of the material to be tested. A sample clamping mechanism of an ultrasonic fatigue testing unit is disposed in a pressure tank (6). A pressure pump (7) is connected to the pressure tank through a pipe. By adoption of the device, the degree of testing difficulty of fatigue performance of materials under high-pressure states is lowered, and satisfied experiment results can be obtained.
Owner:SOUTHWEST JIAOTONG UNIV
Ultrasonic amplitude-change pole assembly, and ultrasonic fatigue loading test device and method
ActiveCN113790975AEasy to integrateEfficient integrationMaterial strength using tensile/compressive forcesMaterial strength using steady bending forcesEngineeringAcoustics
The invention discloses an ultrasonic amplitude-change pole assembly. A rod body of the ultrasonic amplitude-change pole assembly comprises a first ultrasonic amplitude-change pole and a second ultrasonic amplitude-change pole, one of the first ultrasonic amplitude-change pole and the second ultrasonic amplitude-change pole is provided with a sealing flange, and the other one of the first ultrasonic amplitude-change pole and the second ultrasonic amplitude-change pole is connected with a sample; and the sealing flange is positioned at a vibration node of the first ultrasonic amplitude-change pole or the second ultrasonic amplitude-change pole. The rod body is sleeved with the sleeve, and an annular cavity gap with the two ends blocked is formed between the sleeve and the rod body. The cooling flow channel comprises an inner flow channel formed in the rod body, and the inner flow channel communicates with the annular cavity gap. The sealing flange is arranged on the rod body, so that the rod body can be effectively integrated with a complex atmosphere cavity or a high-temperature atmosphere cavity; a cooling medium sequentially flows through the inner flow channel and the annular cavity gap and can cool the rod body of the ultrasonic amplitude transformer assembly from inside to outside, so that the refrigeration efficiency is greatly improved. The invention further provides an ultrasonic fatigue loading test device with the ultrasonic amplitude transformer assembly and an ultrasonic fatigue loading test method based on the ultrasonic fatigue loading test device.
Owner:JILIN UNIV
Ultrasonic fatigue average stress loading device
InactiveCN107957448AGuaranteed Resonance RequirementsAvoid the Harm of ResonanceAnalysing solids using sonic/ultrasonic/infrasonic wavesBall screwEngineering
The invention relates to an ultrasonic fatigue average stress loading device which is used in the field of ultrasonic fatigue tests and solves the problem of loading average stress in the ultrasonic fatigue tests. The ultrasonic fatigue average stress loading device is characterized in that an outer circle of a location seat in an ultrasonic generation assembly penetrates through a through hole atthe uppermost end of a support vertical plate, and the location seat and the support vertical plate are fastened by screws; a linear sliding sleeve a in a stress loading assembly is arranged on a smooth straight rod in the middle of a sliding guiding rod a in a sleeving mode, and a linear sliding sleeve b in the stress loading assembly is arranged on a smooth straight rod in the middle of a sliding guiding rod b in a sleeving mode; a flange structure at the right end of a speed reducer casing in a power assembly and the support vertical plate are fastened by screws, the left end of a ball screw is inserted into a flat key output hole of the speed reducer, and transmission can be achieved after connection. The ultrasonic fatigue average stress loading device disclosed by the invention canprovide + / -40kN axial tensile pressure load infliction for a test piece in the ultrasonic fatigue tests, can achieve 20kHz frequency fatigue tests, effectively shortens fatigue test time and can finish 1010 weekly fatigue tests in high efficiency.
Owner:SOUTHWEST PETROLEUM UNIV
Flexible ultrasonic fatigue damage detection device and manufacturing method thereof
ActiveCN111505119AHigh precisionImplement encapsulationAnalysing solids using sonic/ultrasonic/infrasonic wavesFatigue damageEngineering
The invention relates to a flexible ultrasonic fatigue damage detection device and a manufacturing method thereof. The device comprises multiple pairs of detection parts, each pair of detection partscomprises a signal transmitting unit and a signal receiving unit which are adjacently arranged, and the multiple pairs of detection parts are adjacent and linearly arranged on a flexible substrate. The flexible substrate is used for being wound on a hollow wheel shaft, the signal transmitting unit is used for transmitting an ultrasonic detection signal under the control of a processing circuit, and the signal receiving unit is used for receiving a reflection signal of the ultrasonic detection signal. The processing circuit is further used for determining the signal change according to the ultrasonic detection signals and the reflection signals and determining the fatigue damage condition of the hollow wheel shaft according to the signal change. A packaging layer is located above the flexible substrate and covers the plurality of pairs of detection parts. According to the device and the manufacturing method thereof provided by the embodiment of the invention, the manufactured device issoft, light and thin, can be tightly attached to the surface of the hollow wheel shaft, and is high in precision, stability and reliability of the fatigue damage detection.
Owner:TSINGHUA UNIV
Method for predicting low-temperature ultrahigh-cycle fatigue life of high-strength steel
ActiveCN111044349AMaterial strength using tensile/compressive forcesMaterial strength using single impulsive forceFracture mechanicsEngineering
The invention discloses a method for predicting low-temperature ultrahigh-cycle fatigue life of high-strength steel. According to the method, a low-temperature ultrasonic fatigue test is adopted, parameters reflecting a low-temperature environment are introduced based on a fracture mechanics theory, a low-temperature ultra-high-cycle fatigue life equation of a material is established, and the ultra-high-cycle fatigue life of the high-strength steel in different low-temperature environments is quantitatively evaluated. The method avoids expensive, time-consuming and easily-damaged low-temperature ultrahigh-cycle fatigue tests, and has the advantages of simplicity, rapidness and economy.
Owner:FOSHAN UNIVERSITY
Ultrasonic fatigue stress amplifying device with unified sample size
ActiveCN111855447AStable structureEasy to useMaterial strength using repeated/pulsating forcesMaterial consumptionEngineering
The invention discloses an ultrasonic fatigue stress amplification device with a unified sample size. The ultrasonic fatigue stress amplification device comprises an ultrasonic transducer, an extension rod axially connected to the end of the ultrasonic transducer in a matched mode and an adjustable stress amplification mechanism connected to the end, away from the ultrasonic transducer, of the extension rod in a matched mode. The device is reliable in structure, high in use performance and convenient to operate, through cooperation of the ultrasonic transducer, the extension rod and the adjustable stress amplification mechanism, the stress wave transmission is reliable and stable, the fatigue performance of the material is accurately tested, the material consumption of the ultrasonic fatigue test is greatly saved, the maximum stress loading value of the middle section is remarkably improved, and the high stress loading effect under low vibration is achieved.
Owner:SICHUAN UNIV
Sub-ultrasonic high-frequency fatigue testing machine
ActiveCN103091184BReduce frequencySmall sizeMaterial strength using repeated/pulsating forcesStress ratioTransformer
Owner:天津益普科技发展有限公司
Frequency adjustable type ultrasonic amplitude transformer
InactiveCN107703214AEasy to adjustGuaranteed accuracyUltrasonic/sonic/infrasonic wave generationMechanical vibrations separationAudio power amplifierTransformer
The invention relates to a frequency adjustable type ultrasonic amplitude transformer and belongs to the field of ultrasonic fatigue test. The frequency adjustable type ultrasonic amplitude transformer is capable of solving the problem that the inherent frequency of a displacement amplifier in the ultrasonic fatigue test cannot be adjusted according to the test requirements. According to the technical scheme, a positioning rod is fastened with a fixing base through bolts; an upper end of a frequency up-modulation assembly is fastened with a lower end of an ultrasonic transducer through a bolta; the lower end of the frequency up-modulation assembly is fastened with the upper end of the positioning rod through a bolt b; the upper end of a frequency down-modulation assembly is fastened withthe lower end of the positioning rod through a bolt c; the lower end of the frequency down-modulation assembly is fastened with the upper end of an amplitude-change pole through a bolt d; the lower end of the amplitude-change pole is fastened with the upper end of a test piece through a bolt e; the inherent frequency of the frequency up-modulation assembly and the frequency down-modulation assembly is at 20kHz and is adjustable in a certain bandwidth scope; the axial lengths of the frequency up-modulation assembly, the positioning rod, the frequency down-modulation assembly, the amplitude-change pole and the test piece all are half wave length. The frequency adjustable type ultrasonic amplitude transformer is capable of adjusting the inherent frequency of the frequency up-modulation assembly and the frequency down-modulation assembly and overcoming the defects of the conventional integrated displacement amplifier.
Owner:SOUTHWEST PETROLEUM UNIV
Ultrasonic fatigue testing machine and ultrasonic fatigue testing method
ActiveUS9588009B2Appropriate performanceAnalysing solids using sonic/ultrasonic/infrasonic wavesVibration testingEngineeringInternal temperature
This ultrasonic fatigue testing machine is one that resonates a test piece by an ultrasonic wave to perform a fatigue test, and configured to include an ultrasonic wave generation part 10, a displacement measurement part 20, and a control part 30 that controls the overall operation of the ultrasonic fatigue testing machine. The control part 30 is configured to have a computer that includes storage devices capable of store programs and various types of data, such as an RAM and an ROM, and an arithmetic unit such as a CPU, and includes an internal temperature estimation part 31, an allowable range setting part 32, and a determination part 33 as a main functional configuration.
Owner:SHIMADZU CORP
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