CN108627572B - Ultrasonic cracking test device and method - Google Patents
Ultrasonic cracking test device and method Download PDFInfo
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- CN108627572B CN108627572B CN201810441717.8A CN201810441717A CN108627572B CN 108627572 B CN108627572 B CN 108627572B CN 201810441717 A CN201810441717 A CN 201810441717A CN 108627572 B CN108627572 B CN 108627572B
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Abstract
The invention discloses an ultrasonic cracking test device and a method, which relate to the field of mechanical stretching, and the device comprises a universal material testing machine, an upper ultrasonic vibration mechanism, a lower ultrasonic vibration mechanism, a computer system and the like, wherein the upper ultrasonic vibration mechanism and the lower ultrasonic vibration mechanism adopt a symmetrical structural design, an upper ultrasonic generator and a lower ultrasonic generator are controlled by the computer system, so that the upper ultrasonic generator and the lower ultrasonic generator respectively generate sine signals and cosine signals with the same amplitude, frequency and initial phase, the amplitude and the stress acting on a sample are mutually superposed, the stress at the middle position of a cracking sample is maximum, the stretching speed of a stretcher is controlled by adjusting the amplitude, the frequency and the vibration mode of ultrasonic vibration, the sample is stretched and broken under the action of the ultrasonic vibration and static load, and the device is suitable for testing the tensile cracking performance of the sample containing a cracking tank under the action of the ultrasonic vibration. Compared with the traditional ultrasonic testing device, the ultrasonic vibration energy transfer efficiency is high, the ultrasonic vibration amplitude is improved, and the device is efficient and energy-saving.
Description
Technical Field
The invention relates to the field of cracking tests, in particular to an ultrasonic cracking test device and method.
Background
Today, ultrasound has been applied to an increasing number of machining manufacturing fields, but there is little research directed to the field of ultrasonic cracking. The research on the crack propagation of the alloy under the vibration load is carried out by literature data, and the discovery shows that under the high-frequency vibration, the object with the notch can quickly form a stress concentration phenomenon at the notch, so that the fracture of the object at the notch is accelerated; while the plastic region of the crack tip and the influence of residual stresses on crack propagation can be weakened. Langenecker considers that the metal material has softening effect and hardening effect simultaneously in the ultrasonic-assisted forming process, and the softening effect is researched more at present, the theoretical basis is firmer, but the hardening effect is researched less.
The ultrasonic assisted cracking processing method and the processing device (patent publication No. CN106944737A) of the connecting rod propose that ultrasonic vibration is added into the cracking process of the connecting rod, the amplitude, the frequency and the vibration mode of the ultrasonic vibration are controlled by arranging the ultrasonic vibration on the conventional cracking processing device, so that the material of the cracking area of the connecting rod is in the ultrasonic vibration, the plastic area and the residual stress at the tip of a crack are controlled, and the cracking quality is improved; however, the patent is only directed to the field of cracking processing of connecting rods, and does not provide or provide a general rule that ultrasonic vibration can not be studied on cracking of metal materials. According to the experimental method, a series of experiments are carried out on the ultrasonic vibration stretching of the aluminum alloy, the influence rule of the ultrasonic vibration on the stretching limit of the material is researched, the stretching limit of the material is found to be reduced by the application of the vibration, the stretching limit of the material is reduced more obviously along with the increase of the amplitude, and when the amplitude of the ultrasonic wave is 5.39 microns, the stretching limit is reduced by about 20%, and the analysis is that the stretching limit of a sample is reduced and the plasticity is reduced due to the hardening effect of the vibration; moreover, the ultrasonic vibration is found to enhance the softening effect and the hardening effect of the material with the increase of the amplitude; the maximum amplitude of the test equipment is 5.39 microns, the influence of larger amplitude on the material performance cannot be researched, the obtained conclusion is large in limitation, the device is connected at the ultrasonic vibration end through threads, the other end of the device is clamped and locked by a chuck of a stretching machine, the transmission of ultrasonic vibration on a sample is not facilitated, the clamping end of the stretching chuck is easy to slide in the ultrasonic stretching process, and the experiment result is influenced.
The influence of ultrasonic vibration on the room-temperature plastic deformation process of the AZ31 magnesium alloy is studied by Weili, and the fact that the elongation rate is reduced along with the increase of the vibration energy and the hardening effect is obvious is found; when the vibration amplitude or vibration energy is small, the softening mechanism of the material takes a dominant position, namely the deformation resistance is reduced and the elongation is improved, and when the vibration amplitude or vibration energy is large, the hardening mechanism takes a dominant position, namely the plasticity is reduced and the material is subjected to brittle fracture.
The multi-axis load ultrasonic torsion fatigue test device (patent publication No. CN106501098A), the multi-amplitude ultrasonic tension torsion test device (patent publication No. CN103776693A) for testing the mechanical property of the hard and brittle material, the ultrasonic vibration tensile test device (patent publication No. CN201429552Y) on a universal material testing machine and the ultrasonic vibration tensile test device (patent publication No. 205538471U) for the ceramic material all adopt an ultrasonic input end, the obtained ultrasonic vibration amplitude is low, and the requirement of high amplitude of an ultrasonic cracking test cannot be met; and one end of the sample is connected with the ultrasonic vibration device, and the other end of the sample is fixed and locked through the clamp, so that the ultrasonic vibration energy is not transmitted conveniently, and the machine can be damaged.
The sub-ultrasonic high-frequency fatigue testing machine (patent publication No. CN103091184A) adopts an energy converter as a driving force source, forms a resonance system together with a tested sample and a slave amplitude transformer, and is additionally provided with a preset static load mechanism for providing static load for the test piece; compared with the traditional fatigue testing machine, the device adds the auxiliary amplitude transformer to be connected with the sample so as to improve the transmission efficiency of the ultrasonic wave in the sample, but the device is only limited in a sub-ultrasonic range and only has one ultrasonic wave output point, and based on the current technology, the obtained ultrasonic wave amplitude ratio is small, and the device cannot be used for related researches of ultrasonic cracking experiments.
In order to research the influence of ultrasonic vibration on the hardening effect and the crack propagation rule of the metal material, a tensile cracking performance test of a metal sample containing a cracking groove under the action of ultrasonic vibration needs to be carried out to obtain corresponding mechanical performance parameters of the metal sample and fracture morphology of the cracking sample under the condition of dynamic excitation. However, some existing ultrasonic testing devices all adopt an ultrasonic energy input end, so that the ultrasonic amplitude is low, and the requirements of an ultrasonic cracking test cannot be met; the invention provides a symmetric ultrasonic cracking device and a symmetric ultrasonic cracking method, wherein two ultrasonic systems are simultaneously controlled by a computer, so that ultrasonic energy is efficiently transmitted in a sample, the amplitude of the ultrasonic wave is superposed in the middle of the sample, and the amplitude is improved.
Disclosure of Invention
The invention discloses an ultrasonic cracking test device and a method, wherein two symmetrical ultrasonic vibration mechanisms are arranged in the test device, so that an upper ultrasonic generator and a lower ultrasonic generator respectively generate sine signals and cosine signals with the same amplitude, frequency and initial phase at the same time, the ultrasonic vibration amplitudes are superposed, the stress at the middle position of a cracking sample is greatly improved, and compared with the traditional ultrasonic test device, the ultrasonic cracking test device has the advantages of high ultrasonic vibration energy transfer efficiency, great improvement of the ultrasonic vibration amplitudes, simple structure, high efficiency and energy conservation.
The invention is realized by the following technical scheme:
the ultrasonic cracking test device comprises a universal material testing machine, an upper ultrasonic vibration mechanism, a lower ultrasonic vibration mechanism and a computer system, wherein the upper ultrasonic vibration mechanism and the lower ultrasonic vibration mechanism have the same structure and are symmetrical up and down; the lower ultrasonic vibration mechanism comprises a lower ultrasonic generator, a lower ultrasonic transducer, a lower ultrasonic amplitude transformer and a lower fixing device; the lower ultrasonic generator is connected with the lower ultrasonic transducer through a lead, and the upper end of the lower ultrasonic transducer is connected with the lower ultrasonic amplitude transformer through threads; the lower fixing device comprises a lower T-shaped block, a lower T-shaped block fixing plate, a lower pull rod, a lower pressing plate, a lower ultrasonic fixing plate and a lower flange plate; from bottom to top, the lower T-shaped block is fixed on the lower T-shaped block fixing plate; four lower pull rods are arranged between the lower ultrasonic fixing plate and the lower T-shaped block fixing plate; a lower ultrasonic transducer is arranged between the lower pull rods; the lower end face of the lower flange plate is connected with the lower pressing plate through screws, the centers of the lower flange plate, the lower ultrasonic fixing plate and the lower pressing plate are provided with holes A, and the lower ultrasonic amplitude transformer penetrates through the holes A.
Furthermore, a square groove is formed in the middle of the lower T-shaped block fixing plate; the lower T-shaped block penetrates through a square groove in the middle of the lower T-shaped block fixing plate and is fixedly connected with the lower T-shaped block fixing plate through a screw and a nut.
Further, the upper ultrasonic vibration mechanism comprises an upper ultrasonic generator, an upper ultrasonic transducer, an upper ultrasonic amplitude transformer and an upper fixing device; the upper fixing device comprises an upper T-shaped block, an upper T-shaped block fixing plate, an upper pull rod, an upper ultrasonic fixing plate, an upper flange plate and an upper pressure plate.
Further, the cracking sample is respectively connected with the lower ultrasonic amplitude transformer and the upper ultrasonic amplitude transformer through two double-end studs; the upper T-shaped block and the lower T-shaped block are respectively clamped by an upper clamp and a lower clamp of the universal material testing machine.
Further, the circular through grooves of the lower pressure plate and the lower flange plate and the cylindrical outer wall of the lower ultrasonic amplitude transformer are concentrically assembled, the lower pressure plate and the lower flange plate are in contact with the flange of the lower ultrasonic amplitude transformer, and a gap is reserved between a hole in the lower flange plate and the cylindrical outer wall of the lower ultrasonic amplitude transformer; the circular through grooves of the upper flange plate and the upper pressure plate and the cylindrical outer wall of the upper ultrasonic amplitude transformer are concentrically assembled, the upper pressure plate and the upper flange plate are in contact with the flange of the upper ultrasonic amplitude transformer, and a gap is reserved between the hole in the upper flange plate and the cylindrical outer wall of the upper ultrasonic amplitude transformer.
Furthermore, the device can fixedly clamp other types of samples and carry out an ultrasonic vibration tensile cracking test by arranging clamps on the lower ultrasonic amplitude transformer and the upper ultrasonic amplitude transformer; the ultrasonic vibration upsetting test can be carried out on the upsetting test sample through the downward action of the lifting platform of the universal material testing machine.
The method based on the ultrasonic cracking test device is characterized in that a cracking sample is designed according to an analytical method or a numerical finite element method, the length of the sample is 1/2 of the propagation wavelength of ultrasonic waves in the sample, the inherent frequency of the sample is the ultrasonic vibration frequency, and the cracking sample, an upper ultrasonic vibration mechanism and a lower ultrasonic vibration mechanism jointly form a resonance system; controlling an upper ultrasonic generator and a lower ultrasonic generator by a computer system to enable the upper ultrasonic generator and the lower ultrasonic generator to simultaneously generate sine and cosine signals with the same amplitude, frequency and initial phase respectively, so that the amplitude of the two ultrasonic waves and the stress acting on a sample are mutually superposed, and the stress at the middle position of the cracked sample is maximum; the stretching speed of the stretcher is controlled by adjusting the amplitude, the frequency and the vibration mode of the ultrasonic vibration, so that the test sample is stretched and broken under the action of the ultrasonic vibration and the static load of the universal material testing machine.
Furthermore, by adjusting the ultrasonic signal parameters of the upper ultrasonic generator and the lower ultrasonic generator, namely amplitude, frequency and initial phase, the upper ultrasonic vibration and the lower ultrasonic vibration are superposed in the cracking sample, and finally different types of ultrasonic vibrations are generated.
Further, by providing the upper ultrasonic vibration mechanism and the lower ultrasonic vibration mechanism, the range of the ultrasonic amplitude obtained in the test is 0 μm to 100 μm.
The invention has the beneficial effects that:
1. according to the invention, the two symmetrical ultrasonic vibration mechanisms are arranged in the test device, so that the transmission efficiency of ultrasonic waves in the metal sample is improved, the amplitude is increased through amplitude superposition, the stress at the middle position of the cracking sample is greatly increased, and the cracking of the sample is facilitated.
2. The invention has wide application, not only can be used for ultrasonic cracking test, but also can be used for ultrasonic fatigue test of different stress ratios on a fatigue test piece; the ultrasonic cracking test can be carried out on other types of cracking samples (such as plate-shaped samples) by arranging the clamp on the upper ultrasonic amplitude transformer and the lower ultrasonic amplitude transformer; the ultrasonic vibration upsetting test can be carried out on the upsetting test sample through the downward action of the lifting platform of the universal material testing machine.
3. The invention has simple structure, low manufacturing cost, convenient operation and easy maintenance.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a front view of an ultrasonic lysis test device;
FIG. 2 is a view of the connection structure of the lower ultrasonic horn, the lower pressing plate and the lower flange plate;
FIG. 3 is a view of the connection structure of the upper ultrasonic horn and the upper platen and the upper flange plate;
FIG. 4 is a two-dimensional view of a lysed sample;
FIG. 5 is a schematic diagram of a stress-strain field of a symmetric ultrasonic vibration system;
FIG. 6 is a schematic diagram of a computer system controlling upper and lower ultrasonic generators;
FIG. 7 is a schematic view showing the superposition of the upper ultrasonic vibration stress, the lower ultrasonic vibration stress and the tensile static load stress of the universal material testing machine;
the reference numbers are as follows:
1. the ultrasonic testing device comprises a lower T-shaped block, 2, a lower T-shaped block fixing plate, 3, a lower pull rod, 4, a lower ultrasonic transducer, 5, a lower pressing plate, 6, a lower ultrasonic fixing plate, 7, an inner hexagon screw, 8, a lower flange plate, 9, a lower ultrasonic amplitude transformer, 10, a cracking sample, 11, an upper T-shaped block, 12, an upper T-shaped block fixing plate, 13, an upper pull rod, 14, an upper ultrasonic transducer, 15, an upper ultrasonic fixing plate, 16, an upper flange plate, 17, an upper ultrasonic amplitude transformer, 18, a screw, 19, an upper ultrasonic generator, 20, a computer system, 21, a lower ultrasonic generator, 22, an upper pressing plate, 23, an inner hexagon screw and 24.
Detailed Description
The ultrasonic cracking test device is shown in figure 1, and comprises a universal material testing machine, an upper ultrasonic vibration mechanism, a lower ultrasonic vibration mechanism and a computer system 20, wherein the upper ultrasonic vibration mechanism and the lower ultrasonic vibration mechanism are designed in a symmetrical structure, the lower ultrasonic vibration mechanism consists of a lower ultrasonic generator 21, a lower ultrasonic transducer 4, a lower ultrasonic amplitude transformer 9 and a lower fixing device, the lower ultrasonic generator 21 is connected with the lower ultrasonic transducer 4 through a lead, the lower ultrasonic transducer 4 is connected with the lower ultrasonic amplitude transformer 9 through threads, the lower fixing device comprises a lower T-shaped block 1, a lower T-shaped block fixing plate 2, a lower pull rod 3, a lower pressing plate 5, a lower ultrasonic fixing plate 6 and a lower flange plate 8, the lower flange plate 8 is connected with the lower pressing plate 5 through a screw 18 and tightly pressed on two sides of a flange of the lower ultrasonic amplitude transformer 9 (shown in figure 2), the lower flange plate 8 is fixedly connected with the lower ultrasonic fixing plate 6 through an inner hexagon screw 7, the lower ultrasonic fixing plate 6 is connected with the lower T-shaped block fixing plate 2 through four lower pull rods 3 and nuts, and the lower T-shaped block 1 penetrates through a square groove in the middle of the lower T-shaped block fixing plate 2 and is fixedly connected with the lower T-shaped block fixing plate 2 through screws and nuts; the upper ultrasonic vibration mechanism consists of an upper ultrasonic generator 19, an upper ultrasonic transducer 14, an upper ultrasonic amplitude transformer 17 and an upper fixing device, wherein the upper ultrasonic generator 19 is connected with the upper ultrasonic transducer 14 through a lead, the upper ultrasonic transducer 14 is connected with the upper ultrasonic amplitude transformer 17 through threads, the upper fixing device comprises an upper T-shaped block 11, an upper T-shaped block fixing plate 12, an upper pull rod 13, an upper ultrasonic fixing plate 15, an upper flange plate 16 and an upper pressing plate 22, the upper flange plate 16 is connected with the upper pressing plate 22 through screws 24 and tightly presses two sides of a flange of the upper ultrasonic amplitude transformer 17 (as shown in figure 3), the upper flange plate 16 is fixedly connected with the upper ultrasonic fixing plate 15 through inner hexagonal screws 23, the upper ultrasonic fixing plate 15 is connected with the upper T-shaped block fixing plate 12 through four upper pull rods 13 and nuts, and the upper T-shaped block 11 penetrates through a square groove in the middle of the upper T-shaped block fixing plate 12 and is fixed through screws, The nut is fixedly connected with the upper T-shaped block fixing plate 12; the upper T-shaped block 11 and the lower T-shaped block 1 are respectively clamped by an upper clamp and a lower clamp of the universal material testing machine.
Designing a cracking sample 10 (shown in figure 4) according to an analytical method or a numerical finite element method, selecting 45 steel as a material, wherein the length of the sample is 1/2 of the propagation wavelength of ultrasonic waves in the sample and is 68mm, the inherent frequency of the sample is 20KHz of ultrasonic vibration frequency, and the cracking sample 10 is respectively connected with a lower ultrasonic horn 9 and an upper ultrasonic horn 17 through two double-end studs; the cracking sample 10 and the upper and lower ultrasonic vibration mechanisms together form a resonance system, and the stress-strain field schematic diagram of the resonance system is shown in FIG. 5; controlling an upper ultrasonic generator 19 and a lower ultrasonic generator 21 (as shown in fig. 6) by a computer system 20, so that the upper ultrasonic generator 19 and the lower ultrasonic generator 21 respectively generate sine and cosine signals with the same amplitude, frequency and initial phase, the frequency is 20KHz, the initial phase is 0, the two generated ultrasonic vibration amplitudes are superposed, the amplitude is 50 μm, the stress acting on the cracking sample 10 is superposed, the stress at the middle position of the cracking sample is the maximum, and the superposition of the upper ultrasonic vibration stress, the lower ultrasonic vibration stress and the tensile static load stress of the universal material testing machine is schematically shown in fig. 7; and controlling the stretching speed of the stretcher to be 5mm/min, so that the sample is stretched and broken under the combined action of ultrasonic vibration at two ends and static load of the universal material testing machine.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (9)
1. The ultrasonic cracking test device comprises a universal material testing machine, an upper ultrasonic vibration mechanism, a lower ultrasonic vibration mechanism and a computer system (20), and is characterized in that the upper ultrasonic vibration mechanism and the lower ultrasonic vibration mechanism have the same structure and are symmetrical up and down; the lower ultrasonic vibration mechanism comprises a lower ultrasonic generator (21), a lower ultrasonic transducer (4), a lower ultrasonic amplitude transformer (9) and a lower fixing device; the lower ultrasonic generator (21) is connected with the lower ultrasonic transducer (4) through a lead, and the upper end of the lower ultrasonic transducer (4) is connected with the lower ultrasonic amplitude transformer (9) through threads; the lower fixing device comprises a lower T-shaped block (1), a lower T-shaped block fixing plate (2), a lower pull rod (3), a lower pressing plate (5), a lower ultrasonic fixing plate (6) and a lower flange plate (8); from bottom to top, the lower T-shaped block (1) is fixed on the lower T-shaped block fixing plate (2); four lower pull rods (3) are arranged between the lower ultrasonic fixing plate (6) and the lower T-shaped block fixing plate (2); a lower ultrasonic transducer (4) is arranged between the lower pull rods (3); the lower end face of the lower flange plate (8) is connected with the lower pressing plate (5) through a screw (18), the centers of the lower flange plate (8), the lower ultrasonic fixing plate (6) and the lower pressing plate (5) are arranged at the same position, a hole A is formed, and the lower ultrasonic amplitude transformer (9) penetrates through the hole A.
2. The ultrasonic lysis test device according to claim 1, wherein a square groove is opened in the middle of the lower T-shaped block fixing plate (2); the lower T-shaped block (1) penetrates through a square groove in the middle of the lower T-shaped block fixing plate (2) and is fixedly connected with the lower T-shaped block fixing plate (2) through a screw and a nut.
3. The ultrasonic lysis test device according to claim 1, wherein said upper ultrasonic vibration mechanism comprises an upper ultrasonic generator (19), an upper ultrasonic transducer (14), an upper ultrasonic horn (17) and an upper fixture; the upper fixing device comprises an upper T-shaped block (11), an upper T-shaped block fixing plate (12), an upper pull rod (13), an upper ultrasonic fixing plate (15), an upper flange plate (16) and an upper pressure plate (22).
4. The ultrasonic lysis test device according to claim 1, wherein the lysis sample (10) is connected with the lower ultrasonic horn (9) and the upper ultrasonic horn (17) through two studs respectively; the upper T-shaped block (11) and the lower T-shaped block (1) are respectively clamped by an upper clamp and a lower clamp of the universal material testing machine.
5. The ultrasonic cracking test device of claim 3, wherein the circular through groove of the lower pressure plate (5) and the lower flange plate (8) and the cylindrical outer wall of the lower ultrasonic horn (9) are concentrically assembled, the lower pressure plate (5) and the lower flange plate (8) are in contact with the flange of the lower ultrasonic horn (9), and the hole of the lower flange plate (8) has a gap with the cylindrical outer wall of the lower ultrasonic horn (9); circular through grooves of the upper flange plate (16) and the upper pressure plate (22) and the outer wall of the cylinder of the upper ultrasonic amplitude transformer (17) are concentrically assembled, the upper pressure plate (22) and the upper flange plate (16) are in contact with the flange of the upper ultrasonic amplitude transformer (17), and a gap is reserved between a hole in the upper flange plate (16) and the outer wall of the cylinder of the upper ultrasonic amplitude transformer (17).
6. The ultrasonic testing apparatus of claim 1, wherein the apparatus is fixed and clamped and the ultrasonic vibration tension cracking test is performed by arranging clamps on the lower ultrasonic horn (9) and the upper ultrasonic horn (17); and performing an ultrasonic vibration upsetting test on the upsetting sample through the downward action of the lifting platform of the universal material testing machine.
7. The test method of the ultrasonic lysis test device according to any one of claims 3 or 5, wherein the lysis sample (10) is designed according to an analytical method or a numerical finite element method, the length of the sample is 1/2 of the propagation wavelength of the ultrasonic wave in the sample, the natural frequency of the sample is an ultrasonic vibration frequency, and the lysis sample (10) constitutes a resonance system together with the upper ultrasonic vibration mechanism and the lower ultrasonic vibration mechanism; the upper ultrasonic generator (19) and the lower ultrasonic generator (21) are controlled by the computer system (20), so that the upper ultrasonic generator (19) and the lower ultrasonic generator (21) respectively generate sine signals and cosine signals with the same amplitude, frequency and initial phase, the amplitudes of the two ultrasonic waves and the stress acting on the sample are mutually superposed, and the stress at the middle position of the cracking sample (10) is maximum; the stretching speed of the stretcher is controlled by adjusting the amplitude, the frequency and the vibration mode of the ultrasonic vibration, so that the test sample is stretched and broken under the action of the ultrasonic vibration and the static load of the universal material testing machine.
8. Test method according to claim 7, characterized in that the upper and lower ultrasonic vibrations are superimposed in the lysed sample (10) by adjusting the ultrasonic signal parameters, i.e. amplitude, frequency, initial phase, of the upper and lower ultrasonic generators (19, 21), resulting in different types of ultrasonic vibrations.
9. The test method according to claim 7, wherein the amplitude of the ultrasonic wave obtained at the time of the test is in the range of 0 μm to 100 μm by providing the upper ultrasonic vibration means and the lower ultrasonic vibration means.
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| JP2019053009A (en) * | 2017-09-19 | 2019-04-04 | 株式会社島津製作所 | Ultrasonic fatigue tester jig |
| CN109060487A (en) * | 2018-10-19 | 2018-12-21 | 四川大学 | A kind of separation of metallic grain boundaries that ultrasound is controllable, which is urged, splits structure and method |
| CN110455929B (en) * | 2019-07-31 | 2021-10-12 | 江苏大学 | Non-resonance high-frequency vibration cracking test device and method |
| 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 |
| CN112903422B (en) * | 2021-01-25 | 2022-08-30 | 南昌航空大学 | Compression experimental device and method under ultrasonic vibration and electric pulse coupling |
| CN114459711B (en) * | 2021-12-31 | 2024-03-08 | 北京工业大学 | Variable-temperature ultrahigh-cycle multiaxial fatigue test device with variable stress ratio |
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| US9448149B2 (en) * | 2011-02-15 | 2016-09-20 | National Institute For Materials Science | Method for ultrasonic fatigue testing at high temperature, and testing device |
| CN106426859A (en) * | 2016-10-27 | 2017-02-22 | 华南理工大学 | Extrusion method and die achieving synergistic effect of ultrasonic vibration and uniform tensile stress |
| CN106944737B (en) * | 2017-03-28 | 2019-05-31 | 江苏大学 | Connecting rod ultrasonic wave added cracks processing method and its processing unit (plant) |
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