27 results about "Ultrasonic fatigue" patented technology

The invention belongs to the field of material performance testing of mechanical structure strength, and particularly relates to an ultrasonic fatigue experiment monitoring method based on digital twinning. According to the method, on the basis of an ultrasonic fatigue testing machine platform, an ultrasonic fatigue digital twin model of a tested object is established by collecting frequency, temperature, load and other test data, and real-time online monitoring of ultrasonic fatigue and life prediction are carried out in combination with a fatigue life prediction model. Compared with a traditional test method, the method has the advantages that ultrasonic detection data and a digital twinborn model technology are combined, the fatigue life of the material is predicted and evaluated, the test efficiency is improved, the long-life test cost is reduced, and the accuracy and reliability of test data are improved.

The invention provides a wind power blade ultra-high cycle fatigue performance testing method and device, and relates to the technical field of performance test.The wind power blade is subjected to finite element analysis, the dangerous position and the stress condition of the blade are determined, and on the basis that M potential dangerous nodes with common characteristics are screened out, the performance of the wind power blade is tested. Further screening out potential resonance risk nodes, determining a plurality of dangerous sections corresponding to each potential resonance risk node, screening out a key dangerous section from the plurality of dangerous sections, and analyzing vibration displacement data of each key dangerous section under different loads; a secondary screening strategy for screening out the final dangerous section is obtained, a blade structure test piece is designed and machined according to the final dangerous section, the blade structure test piece is made to generate high-frequency forced vibration under the action of a pressure head, and an ultrasonic fatigue testing machine with the optimized clamp is used for conducting an ultra-high-cycle fatigue test on the wind power blade structure test piece; the technology needs a small test site and is short in test time.

The application belongs to the field of material performance testing of mechanical structure strength, and particularly relates to an ultrasonic fatigue experiment monitoring method based on digital twinning. The method is based on an ultrasonic fatigue testing machine platform, test data such as frequency, temperature and load are collected, an ultrasonic fatigue digital twinning model of the test object is established, and real-time online monitoring of ultrasonic fatigue and life prediction are carried out in combination with a fatigue life prediction model. Compared with the traditional test method, the application combines ultrasonic detection data and digital twinning model technology to realize prediction and evaluation of the material fatigue life, improve the test efficiency, reduce the cost of long-life testing, and improve the accuracy and reliability of the test data.

An adjustable ultrasonic fatigue test horn for longitudinal-torsional combined vibration and a test method thereof are disclosed. The horn's structural features include: a circular concave surface is provided in the middle of the rectangular side plane of the upper circumference of the horn, which is bolted to a rail pressure plate; a central locking bolt passes through the central through-hole of a torsion adjustment body and the rail pressure plate and is threadedly connected to the central screw hole of the circular concave surface; angle fixing members with L-shaped steps, smaller on the outside and larger on the inside, are provided on the inner surfaces of both sides of the torsion adjustment body; the angle fixing members cooperate with the steps on the circumference of the rail pressure plate; and the angle locking bolts pass from the inside to the outside through the angle fixing members and the torsion adjustment body before being connected to the angle locking nuts. Using this horn for ultrasonic fatigue testing, the torsional vibration amplitude can be freely adjusted to obtain the harmonic response and fatigue life of the specimen under different longitudinal-torsional combined vibration conditions. This provides a more accurate and reliable test basis for the fatigue resistance design, fatigue mechanism research, and life prediction of high-speed and aged mechanical components under longitudinal-torsional combined vibration conditions.

This invention provides a high-temperature three-point bending ultrasonic fatigue testing device and its usage method, which can be used to conduct high-temperature and ultra-high-temperature three-point bending fatigue tests on materials. This invention overcomes the limitation of traditional three-point bending ultrasonic fatigue tests, which can only be performed at room temperature, bringing a novel fatigue testing method. Furthermore, the combined fixture device adopts a modular design, making it simple to process and operate, and easy to replace.

The application discloses a kind of concrete asymmetric fatigue test systems based on ultrasonic vibration loading, including universal testing machine, ultrasonic frequency generator, ultrasonic transducer, upper displacement amplifier and lower displacement amplifier and for reducing system loading eccentric moment ball hinge mechanism, the ball hinge mechanism is connected with lower displacement amplifier bottom by clamping connecting disc.This application also provides a kind of concrete asymmetric fatigue test method based on ultrasonic vibration loading, fix the concrete test piece of equal cross section cylinder between upper displacement amplifier and lower displacement amplifier, then open universal testing machine, ultrasonic frequency generator and ultrasonic transducer, realize the ultrasonic vibration asymmetric compression-compression fatigue cycle loading of concrete test piece.The application can realize the asymmetric compression-compression fatigue loading of concrete test piece by ultrasonic fatigue test technology, solve the problem of high time cost in the super-long life fatigue test of traditional concrete fatigue test system.

To provide an evaluation method for inclusions in a steel material that can detect quickly, at low cost, and with high accuracy relatively large non-metallic inclusions that exist at low frequencies in the steel material and can be used to predict the maximum inclusion diameter.SOLUTION: A prediction method for the maximum inclusion diameter in a steel material using ultrasonic fatigue testing includes collecting multiple test pieces each with a critical volume of 400 mm3 or more from the steel material to be evaluated, charging hydrogen into the test pieces, applying stress to each test piece using ultrasonic vibration to break the test pieces, measuring the diameters of non-metallic inclusions, which are fracture initiation points of fracture surfaces of the fractured test pieces, calculating the extreme value statistical distribution from the measured non-metallic inclusion diameters of each test piece, and predicting the maximum diameter of non-metallic inclusions present in a volume larger than the test pieces from this extreme value statistical distribution.SELECTED DRAWING: Figure 8

The present invention discloses a column-type ultrasonic fatigue testing machine and a testing method, which is characterized in that the frame includes a bottom plate, a top plate and a plurality of columns connecting the bottom plate and the top plate; it also includes a transmission frame movably mounted on the column, a servo motor mounted on the top plate, a screw mounted on the servo motor, and a nut seat mounted on the transmission frame and movably connected to the screw; a universal ball head seat is mounted on the transmission frame, a ball head adapted to the universal ball head seat is provided on the ultrasonic mechanism, and a set screw for locking the ball head is installed on the universal ball head seat. The entire frame of the invention is composed of a bottom plate, a top plate and a plurality of columns connecting the bottom plate and the top plate, and the servo motor, ultrasonic mechanism, multi-axis centering platform and drawing base tool head are all integrated on the frame, with fewer overall components, simple structure and small space occupation, and the device can also be directly placed on a laboratory bench or desktop for use.

To simultaneously grasp the property of an inclusion and the state of a gap in the boundary between an inclusion and a mother material in a steel material.SOLUTION: The method for observing an internal defect of a steel material includes the steps of: collecting a main test piece (2) from a steel material (1); breaking the main test piece (2) by an ultrasound fatigue test and obtaining a fracture surface; and observing the state of an inclusion in a starting point on the fracture surface and the state of a gas in the boundary between the inclusion and the mother material.SELECTED DRAWING: Figure 1

The present invention provides a method and device for testing the very high cycle fatigue performance of wind turbine blades, which relates to the technical field of performance testing. Through finite element analysis of wind turbine blades, the present invention clarifies the dangerous positions and stress conditions of the blades. On the basis of screening out M potential dangerous nodes with common characteristics, potential resonance risk nodes are further screened out, and several dangerous cross-sections corresponding to each potential resonance risk node are determined. Then, key dangerous cross-sections are screened out from the several dangerous cross-sections. By analyzing the vibration displacement data of each key dangerous cross-section under different loads, a secondary screening strategy for screening out the final dangerous cross-section is obtained. According to the final dangerous cross-section, a blade structure specimen is designed and processed, so that the blade structure specimen undergoes high-frequency forced vibration under the action of a pressing head, and a very high cycle fatigue test of the wind turbine blade structure specimen is carried out using an ultrasonic fatigue testing machine with optimized fixtures; this technology requires a small test site and a short test time.

The utility model discloses an ultrasonic fatigue test piece heating system, which comprises a heating circuit board, a cooling water container and an ultrasonic fatigue power supply, the heating circuit board is electrically connected with a copper pipe heating ring, one side of the heating circuit board is electrically connected with a voltage transformation power supply, and the other side of the heating circuit board is electrically connected with a power supply. The ultrasonic fatigue power source is connected with an ultrasonic fatigue transducer through a wire, the ultrasonic fatigue transducer is connected with an ultrasonic fatigue amplitude-change pole, the end portion of the ultrasonic fatigue amplitude-change pole is provided with a test piece, and one side of the acrylic organic glass isolation cover is provided with an adjusting supporting assembly. The working environment temperature of the test piece can be increased by adjusting the voltage, so that the more accurate fatigue strength of the test piece can be measured, the test piece can be conveniently clamped, the test piece is always kept stable in the copper pipe heating ring, and the test piece is prevented from being in contact with the copper pipe heating ring.

The invention belongs to the technical field of performance test equipment calibration, and particularly relates to a temperature calibration system and method for high-temperature ultrasonic fatigue equipment, and the system comprises an induction heating device, a sample fixing device, a thermocouple, a temperature and humidity inspection instrument, an infrared thermometer, a temperature controller, and a data processing module. A constant-temperature area of the induction heating coil is accurately aligned with a gauge length section of a tested sample, a thermocouple tip is fixed to the geometric center of the gauge length section of the sample through a high-temperature asbestos rope, and the infrared thermometer is installed in the axis direction of the sample so that a light spot of the infrared thermometer can coincide with the thermocouple tip. Temperature data of an infrared thermometer and a thermocouple are synchronously collected, a deviation value is calculated, and when the temperature exceeds + / -3 DEG C, compensation parameters of a temperature controller are automatically adjusted, so that in-situ rapid and accurate high-temperature ultrasonic fatigue test temperature calibration is realized. According to the invention, the tested sample is used as a standard radiation source for temperature calibration, and the method is suitable for temperature calibration when high-temperature ultrasonic fatigue performance testing is carried out on all metal materials.

The invention provides an ultra-high cycle fatigue crack stress intensity factor solving method, and relates to the technical field of ultra-high cycle fatigue performance analysis and fracture characterization, and the method comprises the following steps: establishing an ultrasonic fatigue sample finite element model containing a precrack; carrying out modal analysis on the sample containing the precracks; carrying out steady-state dynamic response analysis on the sample containing the pre-cracks; dividing a finite element model according to the most dangerous section, and sequentially obtaining a plurality of sections where the required crack front edge is located; nodes are sequentially selected along the cracks on the section, and corresponding displacement parameters at the nodes are extracted to serve as crack opening displacement; calculating a stress intensity factor value at each node under the ultrasonic fatigue load by combining a node displacement method; and a node stress intensity factor is pushed to the crack tip by using a linear regression method, and the value of the node stress intensity factor is used as the stress intensity factor value of the crack tip of the section. The method is suitable for solving and analyzing the stress intensity factor of the crack front edge of the sample under ultrasonic fatigue loading, and is simple and convenient to implement and reliable in precision.

To provide a preparation method of a test piece utilizable for an ultrasonic fatigue test even for a steel type low in hardenability, such as medium carbon steel.SOLUTION: A preparation method of an ultrasonic fatigue test piece includes: performing an induction hardening treatment in which induction heating is performed on a test-piece collection target part of a test-piece base material of a steel material to be evaluated to heat the test-piece collection target part from a surface to a center portion, followed by cooling; performing a tempering treatment on the test-piece base material after the induction hardening treatment; and collecting a test piece for an ultrasonic fatigue test from the test-piece collection target part of the test-piece base material after the tempering treatment.SELECTED DRAWING: Figure 1

The invention discloses an ultra-high-cycle fatigue test device capable of realizing a thermal gradient environment. The ultra-high-cycle fatigue test device comprises an ultrasonic fatigue test device, a tensile test device, a high-temperature environment device, a cooling system, a temperature test device and a microscopic monitoring device, the ultrasonic fatigue test devices are arranged on the upper and lower sides of the high-temperature environment device; the tensile test device is located above the ultrasonic fatigue test device, and the cooling system is connected with the interior of the sample. According to the invention, the comprehensive service behavior test under the conditions of high temperature environment, thermal gradient and multi-stress ratio ultra-high cycle fatigue can be carried out at the same time, multiple functions are integrated, the test under complex conditions is carried out on the same experimental platform, and the performance evaluation of an aero-engine material under more real conditions is realized; the influence of the thermal gradient condition on the service strength and the failure mechanism is explored, and cooperative test research on the service behavior of the engine blade material under the influence of multiple factors such as super-long life fatigue under the high-temperature thermal gradient is realized.

The invention discloses a tumor treatment system based on an ultrasonic fatigue effect, which directly damages a cancer cell membrane structure and destroys the integrity of the cancer cell membrane structure through the continuous action of low-intensity ultrasonic energy, specifically targets a disordered tumor extracellular matrix by utilizing the ultrasonic fatigue effect, and simultaneously causes mechanical damage to tumor blood vessels. The tumor core hypoxia caused by nutrition delivery is blocked, so that cell apoptosis is induced. And the multi-layer mechanical-biological effect jointly inhibits tumor growth. The tumor treatment system is combined with temozolomide for use, can synergistically amplify the anti-tumor effect, and is suitable for hypoxic tumors tolerated by a traditional therapy. According to the treatment system, a non-invasive and controllable tumor treatment mode is achieved through accurate regulation and control of energy, and a new thought is provided for tumor treatment.

The invention discloses a test fixture and method for an ultrasonic fatigue test of a high polymer material. The test fixture comprises a sample piece body, a rectangular groove and a positioning groove are formed in the sample piece body, a first observation hole is formed in the rectangular groove, a matching block body is inserted into the rectangular groove, a second observation hole is formed in the matching block body, and a positioning block is inserted into the positioning groove; the test method comprises the following steps: adhering the polymer film material to the matching block body, and inserting the matching block body into the rectangular groove; the positioning block is inserted into the positioning groove, so that the matching block body is positioned in the rectangular groove; the sample piece body is connected with ultrasonic fatigue test equipment, ultrasonic fatigue test research is carried out, and fatigue data are obtained; the fatigue damage of the polymer film material is directly observed through the first observation hole and the second observation hole. The method has the beneficial effects that the accuracy and reliability of an ultrasonic fatigue test are improved, and the difficulty of the ultrasonic fatigue test is reduced; the working efficiency of the ultrasonic fatigue test is improved; the test fixture is easy to assemble, not easy to fall off, simple to process and stable in connection.

The utility model discloses a multifunctional ultrasonic fatigue testing machine. The multifunctional ultrasonic fatigue testing machine comprises a main machine frame; the loading system comprises an ultrasonic system, a static loading system and a cooling system, the ultrasonic system comprises an ultrasonic generator, an ultrasonic transducer and an amplitude-change pole, the ultrasonic transducer is arranged on the main machine frame, the ultrasonic generator is electrically connected with the ultrasonic transducer, the amplitude-change pole is arranged on the main machine frame and connected with the output end of the ultrasonic transducer, and the static loading system is electrically connected with the static loading system. The static load system comprises a static load resonator, a static load clamp and a servo motor, the servo motor is arranged on the main machine frame, the static load clamp is arranged at the output end of the servo motor, and the cooling system is arranged on the main machine frame; the control system comprises a fatigue test controller and a computer, the fatigue test controller is electrically connected with the ultrasonic generator, and the fatigue test controller is in communication connection with the computer. According to the multifunctional ultrasonic fatigue testing machine, an electronic fatigue test, a low-frequency fatigue test and a static mechanical test can be carried out at the same time, and the multifunctionality of the ultrasonic fatigue testing machine is improved.

The application discloses a stress correction method and system based on size deviation of an ultrasonic fatigue sample, and comprises the following steps: installing a sample to be detected on an ultrasonic fatigue testing machine; determining whether the sample can vibrate according to the vibration frequency range of the testing machine; if not, reprocessing the sample; otherwise, calculating a corresponding theoretical value of a harmonic frequency by using a preset analytical formula or a harmonic response analysis model according to actual size parameters of the sample, selecting a corresponding stress amplitude calculation method according to the range where the theoretical value of the harmonic frequency is located, and calculating an actual stress amplitude; taking the ratio of the actual stress amplitude of the sample to the theoretical value as a correction coefficient, and correcting a preset stress amplitude of the sample according to the correction coefficient. The application can avoid reprocessing samples in batches due to size deviation of the samples. Moreover, more accurate and safer ultrahigh-cycle S / N curves can be obtained, and dangerous results caused by overestimation of fatigue life due to inaccurate stress can be avoided.

To provide an ultrasonic fatigue testing machine capable of imparting appropriate stress in a twisting direction to a test piece.SOLUTION: An ultrasonic fatigue testing machine has: an ultrasonic wave generation part for generating ultrasonic waves; a first horn in which one end is fixed and the other end holds one end of a test piece while amplifying the amplitude of ultrasonic waves inputted to one end and outputting them from the other end; a second horn that is disposed opposite to the first horn while one end in a side opposite to the first horn is fixed and the other end holds the other end of a test piece; a measurement part for measuring a moment imparted to a test piece; a rotary stage capable of adjusting average torsional stress imparted to a test piece according to a moment; and a first XY stage that is positioned between the second horn and the rotary stage and can adjust axis deviation between the center axis of the second horn and the rotation center axis of the rotary stage.SELECTED DRAWING: Figure 1

The invention provides an ultrasonic fatigue test fixture and an ultrasonic fatigue experimental device.The ultrasonic fatigue test fixture comprises a base, two sliding grooves are symmetrically formed in the base, and a close end and a far end are arranged between the two sliding grooves; the sliding block is arranged in the sliding groove, a supporting piece in linear contact with a test piece is arranged at the position, close to the close end, of the sliding block, the sliding block and the sliding groove have a movable state and a locking state, the sliding block can move in the sliding groove in the movable state, and the sliding block can move in the sliding groove in the locking state. The sliding block is locked and limited in the sliding groove through a locking piece. The limiting blocks are arranged on the sliding blocks in a striding mode and used for guiding and limiting the test piece, and a placing position of the test piece is arranged between the limiting blocks. According to the scheme, the test piece can be tested under the action of a complex load.

The invention provides an ultrasonic fatigue test torsional amplitude measuring device, and belongs to the technical field of material torsional fatigue strength tests.A rack and an amplitude measuring assembly are arranged on the surface of a base, a vibration assembly is movably arranged on the rack in the gravity direction, the amplitude measuring assembly is movably arranged relative to the base, and an alignment sleeve is arranged on the amplitude measuring assembly; the alignment sleeve can limit the monitoring surface of the torsion sample connected each time and the measuring instrument to be at the same angle, so that the measuring point can be accurately grasped when the amplitude measuring assembly performs measurement, in addition, the torsion sample and the alignment sleeve are also in surface-to-surface fit, the connection position of the torsion sample and the alignment sleeve is determined, and the accuracy of measurement is improved. Therefore, the most accurate monitoring result is obtained.

The invention discloses a heat dissipation method for a pipeline steel ultrasonic fatigue test sample. The heat dissipation method comprises the following steps: soaking the pipeline steel ultrasonic fatigue test sample subjected to an ultrasonic fatigue test in a flowing cooling medium in a heat dissipation system for cooling. According to the invention, for the sample subjected to the ultrasonic fatigue test, the flowing cooling medium is adopted to realize the heat dissipation of the sample, and a large amount of heat easily accumulated in the sample during the ultrasonic fatigue test is taken away through the flowing cooling medium, so that the problem that the middle part of the sample is easily burnt is avoided, and the test data of the microstructure of the sample is accurate.

The invention belongs to the related technical field of ultrahigh-cycle fatigue tests of materials, and discloses in-situ high-resolution microscopic characterization equipment for an ultrahigh-cycle fatigue test and a design method of the in-situ high-resolution microscopic characterization equipment. In the equipment, an ultrasonic fatigue test device comprises an ultrahigh-cycle fatigue assembly and a supporting block, and in the ultrahigh-cycle fatigue assembly, the supporting block is connected with the ultrahigh-cycle fatigue assembly; the amplitude-change pole extends into the vacuum cavity of the electron microscope device; the sealing device comprises a hollow corrugated pipe, a first sealing end cover and a second sealing end cover, the hollow corrugated pipe penetrates through the supporting block and extends to a bin opening of the vacuum cavity, the first sealing end cover is fixedly attached to the surface of the vacuum cavity, the second sealing end cover is fixedly attached to the supporting block, and the ultrahigh-cycle fatigue assembly extends to the vacuum cavity through the hollow corrugated pipe; the external fine adjustment device enables the displacement zero point of the test piece to be located in an observable area by adjusting the position of the supporting block; the electron microscope device is used for carrying out in-situ observation on the test piece. Based on the equipment, high-resolution in-situ observation of the microcosmic continuous whole process of crack initiation and expansion in the ultrahigh-cycle fatigue test can be realized.

The application provides a design method of a V-shaped notch ultrasonic fatigue variable cross-section cylindrical sample, and relates to the technical field of ultrahigh cycle fatigue performance analysis, and comprises the following steps: obtaining one-dimensional longitudinal vibration equation of the V-shaped notch ultrasonic fatigue variable cross-section cylindrical sample based on elastic wave theory; obtaining displacement amplitude differential equation by separation of variables method; giving vibration displacement amplitude function and harmonic length analytical formula of the V-shaped notch sample; obtaining required harmonic length and basic size of the sample according to test material and given conditions. The reliability of the analytical design method is verified by analyzing the inherent frequency of the sample under the axial tension and compression state by the finite element method. The method is suitable for analytical design and verification of the notch variable cross-section cylindrical sample under the ultrasonic fatigue loading working condition, enriches the sample type and design method of the ultrasonic fatigue test, and when the notch angle, test design frequency and metal material change, the sample only needs to be adjusted in the harmonic length, the principle is simple, and the method is convenient to apply.

The invention discloses a high-frequency cyclic load experimental device and a high-frequency cyclic load experimental method for generating type II crack propagation of a composite material, and relates to the field of crack propagation test of the composite material. The cam is used for realizing controllable loading of a load by changing the rotating speed of the cam and providing a high-frequency displacement load through high-speed rotating motion of the cam, so that the test frequency is accurate and controllable, and the difficulty in high-frequency loading of the load of a traditional fatigue testing machine is overcome; the distance between the camshaft center and the contour is designed according to the required loading condition, millimeter-level displacement loading can be achieved, and the difficulty that the displacement amplitude is too low when ultrasonic fatigue equipment is adopted for high-frequency loading is overcome; the maximum energy release rate is calculated by introducing a dynamic factor determined by mechanical simulation, the change trend of the dynamic effect of the structure along with the test frequency can be accurately captured, and the defect that the high-frequency oscillation load is not accurately measured by a traditional method is overcome; and finally, carrying out regression on the accurately obtained maximum energy release rate and crack propagation rate to obtain fatigue crack propagation parameters of the composite material under the high-frequency load.

The invention discloses a tension-bending composite ultrasonic fatigue test device and a use method thereof, and belongs to the field of material testing. The device mainly comprises a rack, an ultrasonic rotating module and a reflection detection module, the ultrasonic rotating module and the reflection detection module are both installed in the rack, the ultrasonic rotating module is arranged over the reflection detection module, and a to-be-tested sample block is arranged at the bottom of the ultrasonic rotating module; a tensile load and a bending load are simultaneously provided for the sample block through the ultrasonic rotation module, then the amplitude of the sample block is obtained through the reflection detection module and the external laser vibration meter, various data of the sample block in the test process are obtained through finite element analysis, and more accurate and reliable test conditions are provided for a workpiece needing to bear a composite load.