CN210037419U - Sample separation device in ultrasonic fatigue test - Google Patents
Sample separation device in ultrasonic fatigue test Download PDFInfo
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- CN210037419U CN210037419U CN201920796429.4U CN201920796429U CN210037419U CN 210037419 U CN210037419 U CN 210037419U CN 201920796429 U CN201920796429 U CN 201920796429U CN 210037419 U CN210037419 U CN 210037419U
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Abstract
The utility model provides a sample separating device in ultrasonic fatigue test, which comprises a supporting table, wherein a shell is arranged on the supporting table, a clamping mechanism is arranged in the shell, the clamping mechanism clamps the lower end of a sample, and the upper end of the sample is fixed on an energy amplifier of a fatigue testing machine; the sample cooling device is characterized in that an air cylinder mechanism is further arranged in the shell and comprises a cylinder barrel, a piston is arranged in the cylinder barrel and fixedly connected with a clamping mechanism, the piston is connected with a piston rod, the piston rod is arranged in a rod barrel, the rod barrel is communicated with the cylinder barrel, a vent hole is formed in the rod barrel, and low-temperature gas entering the vent hole enters the cylinder barrel through the rod barrel so that the low-temperature gas flows from bottom to top to cool a sample; after the ultrasonic fatigue test is finished, the piston rod is pushed by compressed gas so as to push the piston to drive the clamping mechanism to move downwards, the upper end and the lower end of the sample are separated, and the sample of the fatigue fracture is directly obtained.
Description
Technical Field
The utility model belongs to the fatigue test field especially relates to a sample separator among ultrasonic fatigue test.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Fatigue failure is one of the main failure modes of modern engineering components, particularly fatigue fracture of high-strength materials, and the fatigue fracture often happens very suddenly under the action of alternating load for a long time, so that serious catastrophic accidents are easily caused. With the design life of many key parts of mechanical equipment improved, the material has ultra-high frequency range (10)7～1010Weekly) fatigue behavior has become an important issue in the field of engineering material research, and particularly, the development of an ultrasonic fatigue testing machine has enabled a very high-cycle fatigue test, which has not been possible in the past, to be completed in a short time, so that research in this field has been widely conducted worldwide for decades. The conventional fatigue tester is operated at a frequency of 50Hz by 109The cycle test needs 230 days, the ultrasonic fatigue test machine can rapidly test the fatigue life of the metal material at the repetition frequency of 20KHz for 109The weekly cycling test only requires 14 h. The basic principle of the ultrasonic fatigue testing machine is the same, the ultrasonic fatigue testing machine mainly comprises a power generator, an energy converter and an energy amplifier connected with a sample, wherein one end of the sample is fixed on the energy amplifier, the other end of the sample is suspended, and the sample vibrates along with the energy amplifier.
The inventors found that there are often two problems in performing ultrasonic fatigue tests:
(1) after the loading frequency of the sample reaches a certain degree, the sample is easy to generate a heating phenomenon, and for a 20KHz ultrasonic frequency fatigue testing machine, especially under the condition of high stress test, the sample can generate high heat accumulation in a short time, so that the sample can not resonate, and the normal operation of the test is further influenced. The existing solution is to cool the middle working section of the sample directly by using the low-temperature airflow generated by an air compressor through an air outlet, and set stress loading and unloading intervals in a computer control system to relieve the overheating phenomenon of the sample. Chinese patent No. CN 107576559 a discloses a system for preventing sample from being overheated and cold in high frequency fatigue test, the cooling system is composed of an air compressor, a compressed air storage tank, an oil-water separator, a heat exchanger, and a fan-shaped air outlet, the compressed air is cooled by a liquid nitrogen heat exchanger and then directly acts on the sample, and the temperature of the air outlet is adjustable, so the system is widely applicable to materials. And the device can also play a good role in ensuring the heat balance of the set temperature in the test during high-frequency induction heating. The existing cooling system directly acts low-temperature compressed air flow on the middle part of a sample, so that the middle working section of the sample can be subjected to transverse compressive stress, and the accuracy of the sample in a uniaxial mechanical test is influenced.
(2) After ultrasonic fatigue tests are finished on a part of samples such as magnesium alloy, 40Cr and other materials, the samples often cannot resonate continuously after fatigue cracks are generated on the outer surface or in the sample, and at the moment, the middle working section of the sample still does not generate fatigue fracture, so that the fracture cannot be observed to determine the position of a fatigue point. The fracture of the fatigue sample is a pair of matched fracture surfaces, the fracture surface generally occurs in the weakest position in a metal structure, and useful information about the whole fracture process including the nucleation and the propagation of cracks, the influence of environmental factors on the fracture process and the like is recorded. For a metal material with low strength such as magnesium alloy, the metal material can be broken at two ends by manpower, but for a material with high tensile strength such as 40Cr, the metal material cannot be broken by manpower, and in order to obtain a fatigue fracture, only an unseparated sample can be broken by using a tensile testing machine and then a fracture source is observed.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present disclosure provides a sample separation device in an ultrasonic fatigue test, which can cool a sample to be overheated through the flow of low-temperature gas from bottom to top during the test of the ultrasonic fatigue test machine, and simultaneously separate the upper end and the lower end of the sample to directly obtain the sample of a fatigue fracture.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a sample separation device in an ultrasonic fatigue test comprises:
the device comprises a supporting table, a shell is arranged on the supporting table, a clamping mechanism is arranged in the shell, the clamping mechanism clamps the lower end of a sample, and the upper end of the sample is fixed on an energy amplifier of a fatigue testing machine; the sample cooling device is characterized in that an air cylinder mechanism is further arranged in the shell and comprises a cylinder barrel, a piston is arranged in the cylinder barrel and fixedly connected with a clamping mechanism, the piston is connected with a piston rod, the piston rod is arranged in a rod barrel, the rod barrel is communicated with the cylinder barrel, a vent hole is formed in the rod barrel, and low-temperature gas entering the vent hole enters the cylinder barrel through the rod barrel so that the low-temperature gas flows from bottom to top to cool a sample; after the ultrasonic fatigue test is finished, the piston rod is pushed by compressed gas so as to push the piston to drive the clamping mechanism to move downwards, the upper end and the lower end of the sample are separated, and the sample of the fatigue fracture is directly obtained.
The clamping mechanism comprises a sleeve, the sleeve is composed of two detachable parts and used for wrapping and clamping the lower end of the sample, and the sleeve is fixedly connected with the piston.
Further, the sleeve is in threaded connection with the piston.
Further, the bottom of the cylinder barrel is provided with a buffer pad for buffering the impact force of the piston on the bottom of the cylinder barrel.
Further, the number of the piston rods is at least two, and the piston rods are symmetrically arranged around the sample.
Furthermore, a guide sleeve is arranged in the rod barrel, and the piston rod penetrates through the guide sleeve.
Furthermore, a sealing ring is arranged above the guide sleeve.
Furthermore, a support frame is arranged below the support platform.
Further, the support frame is a telescopic support frame.
The beneficial effects of this disclosure are:
(1) this disclose can be through the gaseous from bottom to top of low temperature prevention sample overheated when ultrasonic fatigue testing machine is experimental, replace the mode that uses low temperature compressed air directly to tired sample middle part working segment forced air cooling, simultaneously to the sample that can't directly obtain the fatigue fracture, the device promotes the piston rod through sample lower extreme fixture and compressed gas and realizes the upper and lower separation of sample, directly obtains the sample of fatigue fracture.
(2) The ultrasonic fatigue testing machine is only connected with the lower end of a sample, and is not connected with the ultrasonic fatigue testing machine, so that the normal work of the ultrasonic fatigue testing machine is not influenced;
(3) the device has the advantages of compact structure, simple mechanical structure, reasonable operation and long service life.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a perspective view of a sample separation device in an ultrasonic fatigue test according to an embodiment of the present disclosure;
FIG. 2 is a front view of a sample separation device in an ultrasonic fatigue test according to an embodiment of the present disclosure;
FIG. 3 is a structural plan view of a sample separation device in an ultrasonic fatigue test provided by an embodiment of the present disclosure;
FIG. 4 is a structural sectional view of a sample separation device in an ultrasonic fatigue test provided by an embodiment of the disclosure;
fig. 5 is a partially enlarged view of fig. 4.
Wherein, 1-a support table; 2-a support frame; 3-a shell; 4-a barrel; 5-a sample chamber; 6-cylinder barrel; 7-a piston; 8-a piston rod; 9-a vent hole; 10-a sleeve; 11-sample; 12-cushion pad.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
The present disclosure provides a sample separation device, which includes a support table, a clamping mechanism and a cylinder mechanism.
Specifically, as shown in fig. 1 to 3, the sample separation apparatus of the present embodiment includes:
the fatigue testing machine comprises a supporting table 1, wherein a shell 3 is arranged on the supporting table 1, a clamping mechanism is arranged in the shell 3, the clamping mechanism clamps the lower end of a sample 11, and the upper end of the sample 11 is fixed on an energy amplifier of the fatigue testing machine; still be provided with cylinder mechanism in the casing 3, cylinder mechanism includes cylinder 6, be equipped with piston 7 in the cylinder 6, piston 7 and fixture fixed connection, piston 7 links to each other with piston rod 8, piston rod 8 sets up in the rod section of thick bamboo 4, the rod section of thick bamboo 4 is linked together with cylinder 6, be provided with air vent 9 on the rod section of thick bamboo 4, as shown in fig. 4 and 5, the low temperature gas that gets into the air vent gets into the cylinder through the rod section of thick bamboo and makes low temperature gas flow from bottom to top and cool off the sample.
Meanwhile, after the ultrasonic fatigue test is finished, aiming at the sample which cannot directly obtain the fatigue fracture, the device pushes the piston rod through compressed gas and then pushes the piston to drive the clamping mechanism to move downwards, so that the upper end and the lower end of the sample are separated, and the sample of the fatigue fracture is directly obtained.
And a support frame 2 is arranged below the support table 1.
The support frame 2 is a telescopic support frame.
In the specific implementation, the periphery of the support platform is fixedly connected with a circular hoop formed by two semicircles through screws and bolts, and the support frame is fixedly connected to the circular hoop.
Wherein, the support frame is used for supporting the supporting bench for sample separator cooperates the use of ultrasonic fatigue testing machine.
The sample separator of this embodiment, the cooperation ultrasonic fatigue testing machine uses. The embodiment is only connected with the lower end of the sample, and is not connected with the ultrasonic fatigue testing machine, so that the normal work of the ultrasonic fatigue testing machine is not influenced;
the clamping mechanism is used for clamping the lower end of the sample and is connected with the air cylinder mechanism, and the upper end of the sample is fixed on an energy amplifier of the fatigue testing machine, so that the upper end and the lower end of the sample are separated by pushing the clamping mechanism to move downwards, and the sample of the fatigue fracture is directly obtained.
The technical scheme of the disclosure is described in detail below by taking the clamping mechanism as a sleeve as an example:
the clamping mechanism comprises a sleeve, the sleeve is composed of two detachable parts and is used for wrapping and clamping the lower end of the sample, and the sleeve is fixedly connected with the piston.
It is understood that in other embodiments, the clamping mechanism may be other existing clamping structures, and those skilled in the art can set the clamping mechanism according to specific working conditions, which will not be described in detail herein.
In one embodiment, the sleeve is threadedly connected to the piston.
It should be noted that the sleeve and the piston can be fixed by other connection methods, and those skilled in the art can specifically select them according to the actual situation.
In one embodiment, the bottom of the cylinder 6 is provided with a cushion pad 12 for cushioning the impact force of the piston against the bottom of the cylinder.
In one embodiment, the number of the piston rods is at least two, and the piston rods are symmetrically arranged around the sample, as shown in fig. 3, wherein the number of the rod barrels for accommodating the piston rods is four, the sample cavity 5 for accommodating the sample is communicated with the sleeve 10, and the rod barrels are symmetrically arranged around the sample cavity.
Therefore, the stress of the piston is uniform, and a fatigue fracture sample with better performance can be obtained.
As an embodiment, a guide sleeve is arranged in the rod barrel, and the piston rod penetrates through the guide sleeve.
The guide sleeve is formed by pressing polytetrafluoroethylene resin into a blank, sintering and cooling the blank, and then performing finish machining by adopting a mechanical cutting method according to the geometric dimension and tolerance range required by a drawing of a customer. The guide sleeve is used for improving the guide precision of the air cylinder.
In one embodiment, a sealing ring is disposed above the guide sleeve.
Wherein the sealing ring is used for sealing the rod barrel so as to prevent air leakage from the piston rod and prevent external dust from mixing into the cylinder.
The embodiment has good compatibility, not only realizes the functions of cooling the sample and separating the sample after the test, but also can mix corrosive gas and gases with different humidity in compressed gas to simulate different test environments during the fatigue test;
this embodiment can prevent the sample overheat through the gaseous flow from bottom to top of low temperature when ultrasonic fatigue testing machine is experimental, replaces to use low temperature compressed air directly to tired sample middle part working segment strong wind cold blowing's mode, simultaneously to the sample that can't directly obtain the fatigue fracture, the device passes through sample lower extreme fixture and compressed gas and promotes the piston rod and realize the upper and lower separation of sample, directly obtains the sample of fatigue fracture.
The sample separation device of the embodiment has the advantages of compact structure, simple mechanical structure, reasonable operation and long service life.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (9)
1. The utility model provides a sample separator among ultrasonic fatigue test which characterized in that includes:
the device comprises a supporting table, a shell is arranged on the supporting table, a clamping mechanism is arranged in the shell, the clamping mechanism clamps the lower end of a sample, and the upper end of the sample is fixed on an energy amplifier of a fatigue testing machine; the sample cooling device is characterized in that an air cylinder mechanism is further arranged in the shell and comprises a cylinder barrel, a piston is arranged in the cylinder barrel and fixedly connected with a clamping mechanism, the piston is connected with a piston rod, the piston rod is arranged in a rod barrel, the rod barrel is communicated with the cylinder barrel, a vent hole is formed in the rod barrel, and low-temperature gas entering the vent hole enters the cylinder barrel through the rod barrel so that the low-temperature gas flows from bottom to top to cool a sample; after the ultrasonic fatigue test is finished, the piston rod is pushed by compressed gas so as to push the piston to drive the clamping mechanism to move downwards, the upper end and the lower end of the sample are separated, and the sample of the fatigue fracture is directly obtained.
2. The device for separating the sample in the ultrasonic fatigue test as claimed in claim 1, wherein the clamping mechanism comprises a sleeve, the sleeve is composed of two parts which can be disassembled and is used for wrapping and clamping the lower end of the sample, and the sleeve is fixedly connected with the piston.
3. The apparatus for separating a sample in an ultrasonic fatigue test according to claim 2, wherein the sleeve is threadedly coupled to the piston.
4. The device for separating samples in the ultrasonic fatigue test as claimed in claim 1, wherein the bottom of the cylinder is provided with a buffer pad for buffering the impact force of the piston on the bottom of the cylinder.
5. The device for separating samples in ultrasonic fatigue tests as claimed in claim 1, wherein the number of the piston rods is at least two and the piston rods are symmetrically arranged around the samples.
6. The device for separating samples in ultrasonic fatigue tests as claimed in claim 1, wherein a guide sleeve is arranged in the rod barrel, and the piston rod penetrates through the guide sleeve.
7. The device for separating the sample in the ultrasonic fatigue test as claimed in claim 6, wherein a sealing ring is arranged above the guide sleeve.
8. The device for separating samples in ultrasonic fatigue tests as claimed in claim 1, wherein a support frame is arranged below the support platform.
9. The device for separating a sample in an ultrasonic fatigue test according to claim 8, wherein the support frame is a telescopic support frame.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920796429.4U CN210037419U (en) | 2019-05-29 | 2019-05-29 | Sample separation device in ultrasonic fatigue test |
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| CN201920796429.4U CN210037419U (en) | 2019-05-29 | 2019-05-29 | Sample separation device in ultrasonic fatigue test |
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| CN210037419U true CN210037419U (en) | 2020-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132727A (en) * | 2019-05-29 | 2019-08-16 | 山东省分析测试中心 | Sample separating apparatus and its application in a kind of ultrasonic wave fatigue test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132727A (en) * | 2019-05-29 | 2019-08-16 | 山东省分析测试中心 | Sample separating apparatus and its application in a kind of ultrasonic wave fatigue test |
| CN110132727B (en) * | 2019-05-29 | 2024-07-19 | 山东省分析测试中心 | Sample separation device in ultrasonic fatigue test and application thereof |
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