CN203350138U - High-frequency torsional fatigue test device - Google Patents
High-frequency torsional fatigue test device Download PDFInfo
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- CN203350138U CN203350138U CN 201320325828 CN201320325828U CN203350138U CN 203350138 U CN203350138 U CN 203350138U CN 201320325828 CN201320325828 CN 201320325828 CN 201320325828 U CN201320325828 U CN 201320325828U CN 203350138 U CN203350138 U CN 203350138U
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- torsional
- conversion equipment
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Abstract
The utility model provides a high-frequency torsional fatigue test device, belongs to the technical field of material fatigue tests, and can be used for effectively converting axial waves into torsional waves so as to solve the problem of difficulty for loading of torsional loads. The high-frequency torsional fatigue test device comprises a test bracket used for fixing an energy converter and a stretching-twisting conversion device, wherein the test bracket is used for supporting the whole test equipment; the stretching-twisting conversion device is used for converting the axial vibration waves generated by the energy converter into the circumferential torsional waves through a torsional displacement amplifier; the conversion device is formed by closely and fixedly connecting an axial displacement vibration rod with a coupler; the axial displacement vibration rod and the coupler form a 20 kHz resonance system and keep vibration modes of themselves, namely the axial vibration rod keeps the axial stretching vibration and the coupler keeps the circumferential torsional vibration; and the torsional displacement amplifier is used for amplifying the torsional vibration waves generated by the coupler to achieve high-frequency torsional fatigue test of different loads. The high-frequency torsional fatigue test device is mainly used for high-frequency torsional fatigue test.
Description
Technical field
The utility model belongs to fatigue of materials experimental technique field, is specifically related to the high-frequency torsional fatigue experimental provision.
Technical background
Fatigue is the phenomenon of material failure under Cyclic Load.Various aspects at modern project, as automobile, aircraft, steamer, rolling stock, engineering machinery, oil-well drilling equipment, railroad bridge, nuclear reactor and generating set etc., its critical part and member are worked mostly under the load of circulation change, and fatigue is its main failure mode.According to statistics, the destruction 90% of various moving links is caused by fatigue.Fatigue break normally occurs suddenly, without any tendency, often causes catastrophic accident.Given this, fatigue of materials research is subject to numerous scientific workers' attention.
Along with the development of the field industrial technologies such as Aero-Space, automobile, railway, nuclear industry, each parts in the phase, bear the number of times of repeated load up to 10 under arms
9?10
11inferior circulation.This cyclic loading peak value often is less than " safety " load estimated according to static fracture analysis.
The high-cycle fatigue experimental technique adopts resonance principle, and the electric signal of the 20KHZ that transducer produces radio-frequency generator changes into the mechanical vibration of same frequency, and the vibration displacement amplifier amplifies mechanical vibration, and loads on fatigue sample.Realize in this way the Fatigue Life in Very High Cycle experiment of material.The high-cycle fatigue technology is high with its frequency, load stable characteristics, becomes the main experiment method of material Fatigue Life in Very High Cycle research.
Existing high-cycle fatigue pilot office is limited at tension and compression, crooked two load cases, and the structure parts of each industrial circle are bearing torsion load in various degree toward contact.Because existing experimental facilities does not have axial wave to be converted to the device of torsional wave, and the loading of torsional load has difficulties, so domestic rarely have the correlative study of the material of development Very High Cycle torsional fatigue performance.
Summary of the invention
The purpose of this utility model is to provide a kind of high-frequency torsional fatigue experimental provision, thereby it can effectively convert axial wave to the problem that loading that torsional wave solves torsional load has difficulties.
The purpose of this utility model is achieved through the following technical solutions: it comprises transducer, experiment support, conversion equipment fixed bearing platform and stretching---reverse conversion equipment, stretch---reverse conversion equipment and be comprised of axial displacement vibrating arm and coupling mechanism, both connect by screw rod; Transducer fixture tail end is threaded bar, and this threaded rod is through the experiment support slotted eye, and two nuts by tail end are fixed on experiment support; The transducer fixture has through hole, and the one side has screw; The conversion equipment fixed bearing platform is a set square, and right-angle side of set square has two screws, is bolted on the experiment support slotted eye.
Stretch---reverse conversion equipment and be formed by fixedly connecting by pin by axial displacement vibrating arm and coupling mechanism.
Stretching---the lower end of reversing conversion equipment is connected by screw rod with twist amplifier, and the twist amplifier end is connected with the torsion test specimen.
Transducer fixture and conversion equipment hold fixed bearing platform and form stationary installation, and the assembly of transducer and conversion equipment is horizontally fixed on experiment support.
Transducer and stretching---reverse conversion equipment and be connected by screw rod, stretch---reverse conversion equipment and be connected by screw rod with the torsional displacement amplifier.The 20KHZ electric signal that transducer produces radio-frequency generator changes into the mechanical vibration of same frequency.Stretch---reverse conversion equipment and convert the axial vibration ripple of transducer generation to circumferential torsional wave.Conversion equipment is comprised of axial displacement vibrating arm and coupling mechanism, and two parts are fastenedly connected.Axial displacement vibrating arm and coupling mechanism are approximate respectively, and (approximate is frequency, if not approximate, can't realize that assembly meets resonant condition) meet axial tension vibration, circumferential twisting vibration 20KHZ resonant condition, and the conversion equipment be fastenedly connected also meets the 20KHZ resonant condition.The stretching amplifier is passed to the coupling mechanism end by being fastenedly connected the axial vibration ripple that transducer is produced.Coupling mechanism converts end axis to circumferential torsional wave to vibration wave, and is delivered to the other end of coupling mechanism.Twist amplifier and stretching---the other end that reverses the coupling mechanism of conversion equipment is connected by screw rod.It is required that the high frequency twisting vibration ripple that the torsional displacement amplifier will reverse conversion equipment output is amplified to experiment.
Both adjust by position, should guarantee transducer and stretching---and reverse conversion equipment on same level, mutually there is no acting force; Coupling mechanism should, perpendicular to bearing, keep certain distance with ground.The high-frequency torsional fatigue experimental provision stretches---and reverse conversion equipment and the axial tension vibration wave can be converted to circumferential twisting vibration ripple, the torsional displacement amplifier can amplify the twisting vibration ripple of conversion equipment output.By MODAL TRANSFORMATION OF A, can produce the required twisting vibration ripple of experiment.It is applicable to load high frequency, pure torsion load by a narrow margin, realizes material Very High Cycle torsional fatigue experimental study.
The utility model advantage and effect compared with prior art:
1. existing high frequency fatigue test equipment can only produce longitudinal wave and lateral wave, and experiment content has only been contained stretching, bending, and can't realize reversing, loads.The utility model, by MODAL TRANSFORMATION OF A, has successfully obtained circumferential twisting vibration ripple.
2. MODAL TRANSFORMATION OF A of the present utility model is based upon on the basis of existing transducer, and without transducer is reequiped, convenient and swift, the experimental facilities cost is low.
The accompanying drawing explanation
Accompanying drawing 1 is the utility model front elevation;
Accompanying drawing 2 is the utility model axonometric drawing;
Accompanying drawing 4 is the real experiment support axonometric drawing of the utility model;
Accompanying drawing 5 is the utility model transducer clamp shaft mapping;
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
The present embodiment comprises transducer 1, experiment support 7, conversion equipment fixed bearing platform 6 and stretches---reverse conversion equipment, stretch---, and reverse conversion equipment and be comprised of axial displacement vibrating arm 2 and coupling mechanism 3, both connect by screw rod or pin; Transducer fixture 5 tail ends are threaded bar, and this threaded rod is through experiment support slotted eye 8, and two nuts by tail end are fixed on experiment support 7; Transducer fixture 5 has through hole, for supporting transducer 1; Transducer fixture 5 one sides have screw, and bolt is packed into from screw, fastening transducer 1.Conversion equipment fixed bearing platform 6 is set squares, and right-angle side of set square has two screws, is bolted on experiment support slotted eye 9.
Stretch---reverse conversion equipment and be formed by fixedly connecting by pin by axial displacement vibrating arm 2 and coupling mechanism 3.
Stretching---the lower end of reversing conversion equipment is connected by screw rod with twist amplifier 4, and twist amplifier 4 ends are connected with the torsion test specimen.
Transducer and stretching---reverse conversion equipment and be connected by screw rod, stretch---reverse conversion equipment and be connected by screw rod with the torsional displacement amplifier.
Stretch---reverse conversion equipment and formed by axial displacement vibrating arm 2 and coupling mechanism 3.Axial displacement vibrating arm 2 is titanium alloy rotation bodies, and excircle is stepped.Axial displacement vibrating arm 2 in the present embodiment, the side diameter be connected with transducer 1 is large, and the end diameter be connected with coupling mechanism 3 is little, and can two parts be realized the chamfering transition, can amplify the displacement (displacement enlargement be not very important) of transducer output.Coupling mechanism 3 is solid of revolution, and excircle is stepped.In the present embodiment, coupling mechanism 3 upper ends are cylinder, and lower end is round platform, can amplify the twisting vibration displacement.
In the present embodiment, axial displacement vibrating arm 2 is assembled into the body that is connected (can't produce any relative displacement) with coupling mechanism 3 by pin.Axial displacement vibrating arm 2 be positioned at coupling mechanism 3 directly over, and the axis of axial displacement vibrating arm 2 is vertical with the diameter antarafacial of coupling mechanism 3 xsects.Pin is packed into from axial displacement vibrating arm 2 upper ends, with coupling mechanism 3 outward flange appropriate locations, upper end, is connected.Stretch---reverse conversion equipment and need meet the 20kHz vibration frequency, and two parts maintenance mode of oscillation separately, axial vibration bar 2 retainer shafts are to stretching vibration, and coupling mechanism 3 keeps circumferential twisting vibration.
Stretch---reverse the conversion equipment lower end and be connected by screw rod with twist amplifier 4, twist amplifier 4 ends are connected with the torsion test specimen.According to the experiment needs, the different axial displacement of transducer 1 output, export circumferential displacement by conversion equipment.Twist amplifier 4 is amplified to the needed torsion angle of experiment by the twisting vibration ripple.(if the twisting vibration ripple that coupling mechanism produces is enough large, does not need the torsional displacement amplifier)
As mentioned above, can well realize the purpose of this utility model.
Claims (4)
1. a high-frequency torsional fatigue experimental provision, comprise transducer (1), experiment support (7), conversion equipment fixed bearing platform (6) and stretch---reverse conversion equipment, it is characterized in that: stretch---reverse conversion equipment and be comprised of axial displacement vibrating arm (2) and coupling mechanism (3), both connect by screw rod; Transducer fixture (5) tail end is threaded bar, and this threaded rod is through experiment support (7) slotted eye (8), and two nuts by tail end are fixed on experiment support (7); Transducer fixture (5) has through hole, the one side has screw, and it coordinates fastening transducer (1) with bolt, and conversion equipment fixed bearing platform (6) is a set square, right-angle side of set square has two screws, by bolt (10), is fixed on experiment support slotted eye (9).
2. high-frequency torsional fatigue experimental provision according to claim 1 is characterized in that: described stretching---reverses conversion equipment and is fixedly connected with by pin with coupling mechanism (3) by axial displacement vibrating arm (2).
3. high-frequency torsional fatigue experimental provision as claimed in claim 1 is characterized in that: described stretching---the lower end of reversing conversion equipment is connected by screw rod with twist amplifier (4), and the twist amplifier end is connected with the torsion test specimen.
4. high-frequency torsional fatigue experimental provision as claimed in claim 1, it is characterized in that: described transducer fixture (5) and conversion equipment fixed bearing platform (6) form stationary installation, and the assembly of transducer (1) and conversion equipment is horizontally fixed on experiment support (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320325828 CN203350138U (en) | 2013-06-07 | 2013-06-07 | High-frequency torsional fatigue test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320325828 CN203350138U (en) | 2013-06-07 | 2013-06-07 | High-frequency torsional fatigue test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203350138U true CN203350138U (en) | 2013-12-18 |
Family
ID=49750022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320325828 Expired - Fee Related CN203350138U (en) | 2013-06-07 | 2013-06-07 | High-frequency torsional fatigue test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203350138U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323341A (en) * | 2013-06-07 | 2013-09-25 | 西南交通大学 | High-frequency torsion fatigue experiment device |
-
2013
- 2013-06-07 CN CN 201320325828 patent/CN203350138U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323341A (en) * | 2013-06-07 | 2013-09-25 | 西南交通大学 | High-frequency torsion fatigue experiment device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20160607 |