60 results about "Ultrasonic fatigue" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.