CN115979784A - Double-node ultrahigh-cycle tension-torsion composite fatigue test device - Google Patents
Double-node ultrahigh-cycle tension-torsion composite fatigue test device Download PDFInfo
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- CN115979784A CN115979784A CN202211669875.1A CN202211669875A CN115979784A CN 115979784 A CN115979784 A CN 115979784A CN 202211669875 A CN202211669875 A CN 202211669875A CN 115979784 A CN115979784 A CN 115979784A
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Abstract
The invention discloses a double-node ultrahigh-cycle tension-torsion composite fatigue test device, and belongs to the technical field of material fatigue tests. The method comprises the following steps: longitudinal vibration transducer, upper amplitude modulator, pull-twist amplitude transformer, symmetrical test piece, lower amplitude modulator. The lower end of the longitudinal vibration transducer is sequentially in threaded connection with the upper amplitude modulator, the tension-torsion amplitude transformer, the symmetric test piece and the lower amplitude modulator to form a tension-torsion composite resonance system with double nodes, the tension-torsion amplitude transformer can convert single axial vibration output by the longitudinal vibration transducer into tension-torsion composite vibration, and the amplitude modulator under the matching of the symmetric test piece not only retains a tension-torsion composite vibration mode, but also provides another node capable of serving as a clamping position. The invention can realize the ultra-high cycle tension-torsion composite load loading in the range of 15-35 khz, and can also apply dynamic or static external load by clamping two nodes on the basis.
Description
Technical Field
The invention belongs to the technical field of material fatigue tests, and particularly relates to a multi-axis ultrahigh cycle fatigue test.
Background
Blade and blade disc of aircraft engineThe key parts often work for a long time under complex multi-axis cyclic load, and the cycle frequency of the key parts is generally 10 9 The above ultrasonic fatigue testing device belongs to the ultra-high cycle category, but the current commercial ultrasonic fatigue testing machine can only apply a single axial or bending load, or a torsional vibration transducer is used for applying a single torsional load, so that the state of tension-torsion composite multi-axis load borne by a part in an actual working condition cannot be simulated, an external load cannot be applied on the basis, only simple symmetrical cyclic load loading can be realized, and a corresponding scheme is not available at present for the ultrasonic fatigue testing device for providing the external load on the basis of the tension-torsion composite multi-axis load by using materials.
Disclosure of Invention
The invention provides a double-node ultrahigh-cycle tension-torsion composite fatigue test device, which utilizes the resonance principle and adopts a tension-torsion composite vibration mode with double nodes, can realize tension-torsion composite multi-axis load loading under 15-35 khz, and can apply dynamic or static external load through two nodes on the tension-torsion composite vibration mode.
The technical scheme adopted by the invention is as follows: the device comprises a longitudinal vibration transducer, an upper amplitude modulator, a tension-torsion amplitude transformer, a symmetric test piece and a lower amplitude modulator, wherein the longitudinal vibration transducer is sequentially in threaded connection with the upper amplitude modulator, the tension-torsion amplitude transformer, the symmetric test piece and the lower amplitude modulator.
The longitudinal vibration transducer can only generate axial vibration.
The upper amplitude modulator is matched with the resonance whole body to provide a node with zero displacement, the node with zero amplitude can be used as a stable and reliable clamping position, and the axial amplitude input by the longitudinal vibration transducer can be amplified.
The conical section of the tension-torsion amplitude transformer is provided with a plurality of parallel staggered grooves which can convert part of axial vibration into torsional vibration, the inclined grooves are uniformly distributed on the surface of the cone, the quantity and the spacing distance of the inclined grooves are adjusted, the transverse wave conversion efficiency can be improved, and the torsional component ratio is increased.
The symmetrical test piece is provided with two symmetrical arc notches, and the symmetrical structure can ensure that the tension-torsion composite vibration mode is not damaged after the lower amplitude modulator is connected.
The two ends of the symmetric test piece are both provided with stepped shaft heads, so that the effect of smooth transition of transverse waves can be achieved, and the looseness of threads of the symmetric test piece due to torsional vibration can be prevented.
One end of the lower amplitude regulator is set to be a conical head, so that transverse waves and longitudinal waves transmitted by a symmetrical test piece can be effectively borne, energy gathering is avoided, breakage of a joint is prevented, another node with zero displacement is provided, and the lower amplitude regulator can be used as a stable and reliable clamping position.
The resonance system composed of the longitudinal vibration transducer, the upper amplitude modulator, the tension-torsion amplitude transformer, the symmetric test piece and the lower amplitude modulator adopts a tension-torsion composite vibration mode with double nodes, and the vibration mode not only keeps the tension-torsion composite multi-axis vibration mode, but also provides two nodes capable of being used as clamping positions.
The invention has the advantages and effects that: the device can realize tension-torsion composite multi-axis load loading and also provides two nodes capable of applying dynamic or static external loads; the upper amplitude modulator is matched with the resonance whole body to provide a node with zero displacement, the amplification factor of the upper amplitude modulator can be designed according to actual requirements, and the range of the amplification factor is between 1 and 5; the symmetrical test piece is provided with two symmetrical arc notches, and the symmetrical structure can still keep the tension-torsion composite vibration mode after the lower amplitude modulator is added; two ends of the symmetric test piece are respectively provided with a step shaft head, so that the effect of smooth transition of transverse waves can be achieved, and the loosening of threads of the symmetric test piece due to torsional vibration can be prevented; the resonance system adopts a tension-torsion composite vibration mode with double nodes, the vibration mode allows static or dynamic external loads to be applied to the two nodes, and the maximum tension-torsion deformation of the vibration mode is generated on a test piece instead of an amplitude transformer, so that the service life of the amplitude transformer is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of the ultrahigh cycle tension-torsion composite fatigue testing device with two nodes according to the present invention;
fig. 2 is an upper amplitude modulator.
FIG. 3 is a symmetrical test piece.
Fig. 4 is a lower horn.
FIG. 5 is a diagram of the dual node torsional composite mode employed by the apparatus of the present invention.
The labels in the figure are: 10-longitudinal vibration transducer, 20-upper amplitude modulator, 201-upper node, 30-pulling torsion amplitude transformer, 40-symmetrical test piece, 401-upper stepped shaft head, 402-upper arc notch, 403-lower arc notch, 404-lower stepped shaft head, 50-lower amplitude modulator, 501-conical head and 502-lower node.
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 with the double nodes is shown in figure 1, and the device comprises a longitudinal vibration transducer (10), an upper amplitude modulator (20), a tension-torsion amplitude-changing rod (30), a symmetric test piece (40) and a lower amplitude modulator (50), wherein the lower end of the longitudinal vibration transducer is sequentially in threaded connection with the upper amplitude modulator, the tension-torsion amplitude-changing rod, the symmetric test piece and the lower amplitude modulator to form a tension-torsion composite resonance system with the two nodes, the longitudinal vibration transducer (10) is electrified, and the symmetric test piece (40) can perform tension-torsion vibration according to the vibration mode.
The working principle is as follows:
the material is processed into a symmetrical test piece (40) in a form shown in figure 3, different materials can achieve resonance frequency by adjusting the integral length and diameter of the test piece and the size of an arc notch, the material and the resonance frequency of the embodiment are respectively aviation titanium alloy and 20khz, and the longitudinal vibration transducer (10) can generate axial mechanical vibration after being electrified; the upper amplitude modulator (20) amplifies the mechanical vibration input by the longitudinal vibration transducer (10); the tension-torsion amplitude transformer (30) can convert part of axial vibration amplified by the upper amplitude modulator (20) into torsional vibration so as to output tension-torsion mechanical vibration; the two ends of the symmetrical test piece (40) are designed into stepped shaft heads (401 and 404), so that transverse waves and longitudinal waves input by the torsion amplitude transformer (30) can be better transited, and the symmetrical test piece (40) can realize torsion vibration under single axial excitation; the symmetric test piece (40) is provided with two symmetric arc notches (402 and 403), and the symmetric structure can also keep a tension-torsion composite vibration mode after the lower amplitude modulator (50) is added; the resonance system consisting of the longitudinal vibration transducer (10), the upper amplitude modulator (20), the tension-torsion amplitude transformer (30), the symmetric test piece (40) and the lower amplitude modulator (50) adopts a tension-torsion composite vibration mode with double nodes, the vibration mode allows static or dynamic external loads to be applied to the two nodes, and the maximum tension-torsion deformation of the vibration mode occurs on the symmetric test piece (40) but not on the tension-torsion amplitude transformer (30), so that the service life of the amplitude transformer is ensured.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by 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 compound fatigue test device of binode's super high week tension-torsion which characterized in that includes: the device comprises a longitudinal vibration transducer (10), an upper amplitude modulator (20), a tension-torsion amplitude transformer (30), a symmetric test piece (40) and a lower amplitude modulator (50); the lower end of the longitudinal vibration transducer (10) is sequentially in threaded connection with the upper amplitude modulator (20), the tension-torsion amplitude-changing rod (30), the symmetric test piece (40) and the lower amplitude modulator (50).
2. The dual-node ultrahigh cycle tension-torsion composite fatigue test device according to claim 1, characterized in that: the upper amplitude modulator (20) is designed with an upper node (201) with zero displacement.
3. The dual-node ultrahigh cycle tension-torsion composite fatigue test device according to claim 1, characterized in that: the symmetrical test piece (40) is provided with an upper arc notch (402) and a lower arc notch (403) which have the same size, and two ends of the symmetrical test piece are simultaneously provided with a step shaft head.
4. The dual-node ultrahigh-cycle tension-torsion composite fatigue test device according to claim 1, characterized in that: the lower amplitude regulator (50) is provided with a conical head (501) and a lower node (502) with zero displacement.
5. The dual-node ultrahigh cycle tension-torsion composite fatigue test device according to claim 1, characterized in that: a resonance system consisting of the longitudinal vibration transducer (10), the upper amplitude modulator (20), the tension-torsion amplitude-variable rod (30), the symmetric test piece (40) and the lower amplitude modulator (50) adopts a tension-torsion composite vibration mode structure with double nodes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211669875.1A CN115979784A (en) | 2022-12-25 | 2022-12-25 | Double-node ultrahigh-cycle tension-torsion composite fatigue test device |
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| CN202211669875.1A CN115979784A (en) | 2022-12-25 | 2022-12-25 | Double-node ultrahigh-cycle tension-torsion composite fatigue test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588405A (en) * | 2021-08-01 | 2021-11-02 | 北京工业大学 | Device capable of realizing ultrahigh cycle tension-torsion composite fatigue test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588405A (en) * | 2021-08-01 | 2021-11-02 | 北京工业大学 | Device capable of realizing ultrahigh cycle tension-torsion composite fatigue test |
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