CN113588405A - Device capable of realizing ultrahigh cycle tension-torsion composite fatigue test - Google Patents
Device capable of realizing ultrahigh cycle tension-torsion composite fatigue test Download PDFInfo
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- CN113588405A CN113588405A CN202110877663.1A CN202110877663A CN113588405A CN 113588405 A CN113588405 A CN 113588405A CN 202110877663 A CN202110877663 A CN 202110877663A CN 113588405 A CN113588405 A CN 113588405A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 230000007704 transition Effects 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000033001 locomotion Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- -1 aeroengines Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
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Abstract
The invention discloses a device capable of realizing an ultrahigh cycle tension-torsion composite fatigue test, and belongs to the technical field of material fatigue tests. The method comprises the following steps: longitudinal vibration transducer, pull-twist amplitude transformer and pull-twist test piece. The lower end of the longitudinal vibration transducer is in threaded connection with a tension-torsion amplitude transformer, and the lower end of the tension-torsion amplitude transformer is connected with a tension-torsion test piece. Eight parallel staggered grooves are formed in the surface of the conical section of the tension-torsion amplitude transformer, part of longitudinal waves can be converted into transverse waves by the parallel staggered grooves, two arc notches are formed in the tension-torsion test piece, the first arc notch is used for reducing the frequency of a torsional vibration mode, the torsional vibration mode and an axial vibration mode are subjected to same-frequency resonance, axial and torsional motions are simultaneously generated in the middle cylindrical section of the tension-torsion test piece during working, and then the target notch is subjected to axial and tangential stresses simultaneously. The invention can realize the proportional loading of the pull-torsion composite load under 15-28 khz, has extremely high transverse wave conversion efficiency, can change the pull-torsion ratio by changing the position, length, width and depth of the parallel staggered grooves, and has tangential stress larger than axial stress.
Description
Technical Field
The invention belongs to the technical field of material fatigue tests, and particularly relates to an ultrahigh cycle tension-torsion composite fatigue test.
Background
In the field of key materials such as aeroengines, gas turbines and the like, important parts of the aeroengines, the gas turbines and the like work for a long time under complex cyclic load, and the cycle frequency of the aeroengines, the gas turbines and the like is generally 109The above ultrasonic fatigue test device belongs to the ultra-high cycle range, and the existing ultrasonic fatigue test device can only perform axial or torsional fatigue tests, or utilizes a torsional vibration transducer to directly output torsional vibration, and a heavy object is axially or tangentially matched to load static stress to form an asymmetric torsional load with average stress, which cannot simulate the state of a material under a tension-torsion composite load, but the existing ultrasonic fatigue test device for proportionally loading the material under the tension-torsion composite load is lack of a corresponding scheme.
Disclosure of Invention
The invention provides a device capable of realizing an ultrahigh cycle tension-torsion composite fatigue test, which can realize the proportional loading of tension-torsion composite load, and can realize the tension-torsion composite fatigue test on materials under the condition of 15-28 khz by adopting a tension-torsion vibration mode with dominant torsional vibration by utilizing the resonance principle.
The technical scheme adopted by the invention is as follows: the device comprises a longitudinal vibration transducer, a tension-torsion amplitude transformer and a tension-torsion test piece, wherein the lower end of the longitudinal vibration transducer is in threaded connection with the tension-torsion amplitude transformer, and the lower end of the tension-torsion amplitude transformer is connected with the tension-torsion test piece;
the longitudinal vibration transducer can only generate axial vibration.
The conical section of the tension-torsion amplitude transformer is provided with parallel staggered grooves which are composed of eight common chutes, the upper chute and the lower chute are respectively provided with four parallel staggered grooves, and the upper chute and the lower chute are distributed in a parallel staggered manner and form an angle of 30-50 degrees with the axis, so that longitudinal waves can be converted into transverse waves with great efficiency.
The tension-torsion test piece is provided with two arc notches, the first arc notch is used for reducing the frequency of a torsional vibration mode, so that the torsional vibration mode and an axial vibration mode resonate at the same frequency, and the second arc notch is used as a tension-torsion composite fatigue test section.
The tension-torsion test piece adopts two-section step transition connection tension-torsion amplitude transformer for reducing tension-torsion load at the joint and avoiding connection failure.
The longitudinal vibration transducer, the tension-torsion amplitude transformer and the tension-torsion test piece form a resonance system which adopts a tension-torsion vibration mode with dominant torsional vibration, the torsional vibration component of the tension-torsion vibration mode can be larger than the axial vibration component, the maximum deformation is on the middle cylindrical section of the tension-torsion test piece, the tension-torsion load on the tension-torsion amplitude transformer is small, and the service life of the tension-torsion amplitude transformer can be ensured.
The invention has the advantages and effects that: the ultrahigh-cycle tension-torsion composite fatigue test is realized, and the proportional loading of the tension-torsion composite load can be realized; the parallel staggered grooves can convert longitudinal waves into transverse waves with great efficiency, and the conversion rate is over 50 percent; the tension-torsion test piece is provided with two arc notches, and the scheme can reduce the frequency of a torsional vibration mode, so that the torsional vibration mode and an axial vibration mode resonate at the same frequency, namely, the torsional vibration mode resonates when the axial vibration mode resonates, and the torsional vibration component is maximized; the tension-torsion load at the joint is effectively reduced by the transitional connection mode of the two sections of steps of the tension-torsion test piece, and the failure of the connection is avoided; the resonance system adopts a tension-torsion vibration mode with dominant torsional vibration, and the deformation of the vibration mode on a tension-torsion amplitude transformer is extremely small, so that the service life of the resonance system is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of the ultra-high cycle tension-torsion composite fatigue testing apparatus of the present invention;
FIG. 2 is a drawing and twisting horn;
FIG. 3 is a tension-torsion test piece.
Fig. 4 is a drawing of the torsional vibration pattern vector diagram adopted by the device of the present invention.
The labels in the figure are: 10-longitudinal vibration transducer, 20-tension-torsion amplitude transformer, 201-conical section, 202-parallel staggered groove, 30-tension-torsion test piece, 301-two-section step, 302-first section arc gap, 303-middle cylindrical section and 304-second section arc gap.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
The structural schematic diagram of the ultrahigh-cycle tension-torsion composite fatigue test device is shown in figure 1, and the ultrahigh-cycle tension-torsion composite fatigue test device comprises a longitudinal vibration transducer (10), a tension-torsion amplitude-changing rod (20) and a tension-torsion test piece (30), wherein the lower end of the longitudinal vibration transducer (10) is in threaded connection with the tension-torsion amplitude-changing rod (20), and the lower end of the tension-torsion amplitude-changing rod (20) is connected with the tension-torsion test piece (30), so that the ultrahigh-cycle tension-torsion composite fatigue test is realized.
The working principle is as follows:
the material is processed into a tension-torsion test piece (30) as shown in figure 3, different materials can reach the resonant frequency by adjusting the length, the material and the resonant frequency of the embodiment are respectively a high-temperature alloy tension-torsion test piece and 20khz, when the longitudinal vibration transducer (10) works, an electric signal is converted into axial mechanical vibration, mechanical longitudinal waves input by the longitudinal vibration transducer (10) are transmitted into a tension-torsion amplitude-variable rod (20), part of the longitudinal waves are converted into transverse waves after encountering a parallel staggered groove (202) and are continuously transmitted, so that single axial vibration is converted into tension-torsion composite vibration, but because the torsional vibration modal frequency is lower than the axial vibration modal frequency, when the axial vibration reaches resonance, the torsional vibration does not reach resonance, so that the torsional vibration component is less, while the tension-torsion test piece (30) of the invention is provided with two circular arc notches (302 and 304), the first circular arc notch (302) can reduce the torsional vibration modal frequency, the torsional vibration mode and the axial vibration mode resonate at the same frequency, namely, the resonance of the torsional mode is achieved simultaneously when the axial mode resonates, so that the torsional vibration component is maximized; the resonance system composed of the longitudinal vibration transducer (10), the tension-torsion amplitude-changing rod (20) and the tension-torsion test piece (30) adopts a tension-torsion vibration mode with the dominant torsional vibration, the tension-torsion vibration mode vector diagram is shown in figure 4, the deformation of the vibration mode on the tension-torsion amplitude-changing rod (20) is extremely small, the service life of the vibration mode is ensured, the tension-torsion deformation of the middle cylindrical section (303) of the tension-torsion test piece is extremely large, namely, the axial stress and the tangential stress acting on the second circular arc notch are extremely large, and the energy use efficiency of the transducer is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. The utility model provides a can realize compound fatigue test's of super high week tension-torsion device which characterized in that includes: the device comprises a longitudinal vibration transducer (10), a tension-torsion amplitude-changing rod (20) and a tension-torsion test piece (30); the lower end of the longitudinal vibration transducer (10) is in threaded connection with a tension-torsion amplitude transformer (20), and the lower end of the tension-torsion amplitude transformer (20) is connected with a tension-torsion test piece (30).
2. The device capable of realizing the ultrahigh cycle tension-torsion composite fatigue test according to claim 1, is characterized in that: the conical section (201) of the tension-torsion amplitude transformer is provided with eight grooves (202) which are parallel and staggered with each other and can convert longitudinal waves into transverse waves; the groove is a parallel staggered groove (202) which consists of eight common chutes, the upper chute and the lower chute are respectively four, and the upper chute and the lower chute are distributed in a parallel staggered manner and form an angle of 30-50 degrees with the shaft.
3. The device capable of realizing the ultrahigh cycle tension-torsion composite fatigue test according to claim 1, is characterized in that: the tension-torsion test piece (30) is provided with two arc notches, the first arc notch (302) is used for reducing the frequency of a torsional vibration mode, so that the torsional vibration mode and an axial vibration mode have the same frequency resonance, and the second arc notch (304) is used as a tension-torsion composite fatigue test notch.
4. The device capable of realizing the ultrahigh cycle tension-torsion composite fatigue test according to claim 1, is characterized in that: the tension-torsion test piece adopts two-section steps (301) to be in transition connection with a tension-torsion amplitude transformer (20) and is used for reducing tension-torsion load at a connection part and avoiding connection failure.
5. The device capable of realizing the ultrahigh cycle tension-torsion composite fatigue test according to claim 1, is characterized in that: a resonance system consisting of the longitudinal vibration transducer (10), the tension-torsion amplitude-changing rod (20) and the tension-torsion test piece (30) adopts a tension-torsion vibration mode with dominant torsional vibration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110877663.1A CN113588405A (en) | 2021-08-01 | 2021-08-01 | Device capable of realizing ultrahigh cycle tension-torsion composite fatigue test |
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| CN202110877663.1A CN113588405A (en) | 2021-08-01 | 2021-08-01 | Device capable of realizing ultrahigh cycle tension-torsion composite fatigue test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114224679A (en) * | 2021-11-26 | 2022-03-25 | 中国科学院苏州生物医学工程技术研究所 | Linkage type robot hand driven by bending mode ultrasonic motor |
| CN116413150A (en) * | 2022-12-25 | 2023-07-11 | 北京工业大学 | Multi-shaft ultrahigh-cycle and multi-shaft low-cycle combined amplitude-variable thermo-mechanical fatigue test device |
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| CN116413150A (en) * | 2022-12-25 | 2023-07-11 | 北京工业大学 | Multi-shaft ultrahigh-cycle and multi-shaft low-cycle combined amplitude-variable thermo-mechanical fatigue test device |
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Effective date of registration: 20230419 Address after: 100124 No. 100 Chaoyang District Ping Tian Park, Beijing Applicant after: Beijing University of Technology Applicant after: CHINA AIRPLANT STRENGTH Research Institute Address before: 100124 No. 100 Chaoyang District Ping Tian Park, Beijing Applicant before: Beijing University of Technology |