CN203811470U - Cellular board fatigue testing device - Google Patents
Cellular board fatigue testing device Download PDFInfo
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- CN203811470U CN203811470U CN201420179712.XU CN201420179712U CN203811470U CN 203811470 U CN203811470 U CN 203811470U CN 201420179712 U CN201420179712 U CN 201420179712U CN 203811470 U CN203811470 U CN 203811470U
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- cellular board
- trapezoid cross
- eccentric wheel
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- 230000001413 cellular effect Effects 0.000 title claims abstract description 36
- 238000009661 fatigue test Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model relates to a cellular board fatigue testing device which belongs to the technical field of material performance detection. The cellular board fatigue testing device is characterized in that a pneumatic-started nut locking type trapezoid-cross-section clamp is arranged on a lower base of a fatigue testing machine through a vertical testing bracket, and vertically clamps a clamped test sample, an eccentric wheel vibrator is arranged at the bottom end of the clamped test sample and is connected with an eccentric wheel and an external frequency converter sequentially, the external frequency converter is controlled by a motor to be opened, and the lower part of the clamped test sample is connected with a capacitance strain gauge and an eddy current precise displacement sensor respectively. According to the cellular board fatigue testing device, a cellular board clamper has a trapezoidal cross section so as to prevent from damaging a tested cellular board; the cellular board fatigue testing device is a vertical testing system, the test sample is vertically arranged to ensure that the test sample is uniform in strain, and testing deviations caused by gravity due to horizontal placement are prevented.
Description
Technical field
The utility model relates to a kind of cellular board fatigue test device, belongs to material property detection technique field.
Background technology
In recent years, along with the development of China's new forms of energy, aviation, building, transport and machinery industry, both at home and abroad to the demand of high performance compound substance at rapid growth.Cellular board, due to good performances such as its quality are little, specific strength is high, rigidity is large, has been widely used in wind-power electricity generation industry and Aero-Space industry.Be similar to this class composite products of cellular board under actual working conditions, can be subject to the impact of alternate load, produce fatigure failure.Practice shows, the performance of the serviceable life of this series products and its opposing bending stress is closely related, and the ability of product resistant to bending stresses is strong, and product is not in use prone to the phenomenons such as damage, fracture.
At present, compound substance bending fatigue always servo apply hydraulic pressure system is carried out 3 points, four-point bending torture test test, or uses fatigue tester to carry out axial tension, rotoflector and resonance crooked test.Wherein publication number is the patent application file proposition resonance test of CN103175667A " the tired non-cpntact measurement closed loop of blade method for testing vibration ", but existing above all methods are only applicable to solid material, be not suitable for the cellular board material of hollow structure, and for small sample, the unbalance stress impact that gravity causes is larger, is difficult to ignore.First, for the cellular board material of hollow structure, the excessive retaining part that easily causes of pressure damages, and in the time of test fatigue behaviour, first the pars affecta branch causing because of clamping produces destruction, cannot accurately measure actual performance; Secondly, the degree of accuracy on amplitude detecting and the control of sample holder power, stress is affected largely to the test result of cellular board fatigue behaviour.Up to now, do not have a kind of comparatively desirablely, for the method for testing of cellular board fatigue behaviour, also there is no corresponding supporting fixture, this kind of defect hindered the development of new structure cellular board in wind-power electricity generation and Aero-Space industry.
Summary of the invention
The problem and the deficiency that exist for above-mentioned prior art, the utility model provides a kind of cellular board fatigue test device.This device cellular board clamper is trapezoid cross section, avoid clamper to cause damage to tested cellular board, and this device is vertical test macro, sample is vertically placed, ensure that sample is stressed evenly, avoid the measurement error bringing because of horizontal positioned gravity, the utility model is achieved through the following technical solutions.
A kind of cellular board fatigue test device, comprise vertical test bracket 1, air pressure starts nut lock compact form trapezoid cross section fixture 2, eccentric wheel Vib. 4, eccentric wheel 5, frequency converter 6, motor 7, capacity strain gage 8, current vortex precise displacement sensor 9 and fatigue tester lower bottom base 10, described air pressure starts nut lock compact form trapezoid cross section fixture 2 and is arranged on fatigue tester lower bottom base 10 by vertical test bracket 1, air pressure starts the vertical clamping of nut lock compact form trapezoid cross section fixture 2 and is held sample 3, be held sample 3 bottoms and be provided with eccentric wheel Vib. 4, eccentric wheel Vib. 4 is connecting eccentric wheel 5 successively, external frequency converter 6, external frequency converter 6 is controlled unlatching by motor 7, reach the controlled object of frequency, be held sample 3 bottoms respectively with capacity strain gage 8, current vortex precise displacement sensor 9 connects.
Described air pressure starts nut lock compact form trapezoid cross section fixture 2 and comprises shell, cylinder 11, piston 12, stopper rod 13, set nut 14, connecting link 15, fine-tuning nut I 16, stick harness 17, fine-tuning nut II 18 and trapezoid cross section clamper 19, it is symmetrical structure that this air pressure starts nut lock compact form trapezoid cross section fixture 2, wherein half of housing exterior is provided with the cylinder 11 connecting successively, piston 12, stopper rod 13, half of enclosure from central symmetry axis to be provided with the trapezoid cross section clamper 19 connecting successively, stick harness 17, connecting link 15, stopper rod 13 is positioned at same level position with connecting link 15.
Described trapezoid cross section clamper 19 is connected with stick harness 17 by fine-tuning nut II 18, and stick harness 17 is connected with connecting link 15 by fine-tuning nut I 16, and connecting link 15 is arranged on shell by set nut 14.
Above-mentioned cellular board method for testing fatigue, its concrete steps are as follows:
Step 1: adopt air pressure to start nut lock compact form trapezoid cross section fixture 2 by fixing cellular board upper end also vertical outstanding base 10 tops that are placed on, cylinder 11 is communicated with power supply, pressurized air expands and does work, pressure acting promotes piston 12 toward middle mobile, the piston 12 of cylinder is connected with stopper rod 13, stopper rod 13 promotes stick harness 17 by connecting link 15, makes trapezoid cross section clamper 19 clamp sample;
Step 2: at cellular board bottom setting-up eccentricity wheel Vib. 4, eccentric wheel Vib. 4 is driven by eccentric wheel 5, eccentric wheel 5 connects frequency converter 6, frequency converter 6 is controlled by motor 7, connect respectively capacity strain gage 8, current vortex precise displacement sensor 9 in cellular board lower end, adjust eccentric wheel 5 by frequency converter 6 and rotate factor, thereby adjust the vibration frequency of eccentric wheel Vib. 4, current vortex precise displacement sensor 9 detects the Oscillation Amplitude of cellular board, in the time that Oscillation Amplitude reaches maximal value, the frequency of fixing frequency converter 6, and open capacity strain gage 8 and record stress value;
Step 3: when eccentric wheel Vib. 4 reaches resonance with cellular board, amplitude constant, being applied on cellular board is permanent width fatigue loading, often completes one-period concussion, a symmetry circulating stress of material experience at sample each point place, is performed until fatigure failure or reaches 10
7till cycle index, and record test period;
By add vibrating mass on eccentric wheel Vib. 4, change the quality of sample and eccentric wheel Vib. 4 subassemblies, reach and change the sample assembly intrinsic amplitude object that resonates, again by regulating frequency converter 6, detect the Oscillation Amplitude of cellular board with current vortex precise displacement sensor 9, in the time that Oscillation Amplitude reaches maximal value again, the frequency of fixing frequency converter 6, capacity strain gage 8 records stress value; Change the quality of vibrating mass, thereby record test result fatigue lifetime that different stress values is corresponding;
Step 4: by formula N
i=f
i× t
i, N in formula
iwhen reaching maximal value and reach generation fatigure failure for each Oscillation Amplitude, the fatigue lifetime of this sample, unit is inferior; f
ifrequency values while reaching maximum for each amplitude, unit is hertz (Hz); t
ifor produce the test period of fatigure failure from resonate to, unit is second (S) at every turn, i is 1,2,3 ..., each capacity strain gage records stress value σ
i, unit is MPa (Mpa), with stress σ
ifor ordinate, lgN
ifor horizontal ordinate, can obtain life-span-stress curve, complete the testing fatigue to cellular board.
The beneficial effects of the utility model are: (1) this device cellular board clamper is trapezoid cross section, avoids clamper to cause damage to tested cellular board; (2) this device is by adding vibrating mass, change the sample assembly intrinsic amplitude that resonates, thereby obtain the fatigue lifetime under required stress value, because of vibrating mass quality controllable, therefore test specimen stress value can regulate and control; (3) this device is vertical test macro, and sample is vertically placed, and ensures that sample is stressed evenly, avoids the measurement error bringing because of horizontal positioned gravity; (4) this device utilizes pneumatic pinch structural priming clamper, and conveniently assemble and disassemble sample improves controllability; (5) size of design set nut control clamping force, ensure clamping force constancy, use eccentric wheel Vib., realize sample assembly resonance amplitude adjustable, utilize frequency converter to be adjusted to resonance, utilize current vortex precise displacement sensor to detect maximum vibration amplitude, by detected amplitude maximal value to find resonance point, improve accuracy of detection, convenient judgement and record; (5) capacity strain gage records stress value, and the method facilitates feasible, measures accurately, and can reduce manpower consumption and testing cost.
Brief description of the drawings
Fig. 1 is the utility model cellular board bending fatigue test system structure schematic diagram;
Fig. 2 is that the utility model air pressure starts the bilateral trapezoid cross section of nut lock compact form fixture partial enlarged drawing.
In figure: 1-vertical test bracket, 2-air pressure starts nut lock compact form trapezoid cross section fixture, and 3-is held sample, 4-eccentric wheel Vib., 5-eccentric wheel, 6-frequency converter, 7-motor, 8-capacity strain gage, 9-current vortex precise displacement sensor, 10-fatigue tester lower bottom base, 11-cylinder, 12-piston, 13-stopper rod, 14-set nut, 15-connecting link, 16-fine-tuning nut I, 17-stick harness, 18-fine-tuning nut II, 19-trapezoid cross section clamper.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Embodiment 1
As shown in Fig. 1 to 2, this cellular board fatigue test device, comprise vertical test bracket 1, air pressure starts nut lock compact form trapezoid cross section fixture 2, eccentric wheel Vib. 4, eccentric wheel 5, frequency converter 6, motor 7, capacity strain gage 8, current vortex precise displacement sensor 9 and fatigue tester lower bottom base 10, described air pressure starts nut lock compact form trapezoid cross section fixture 2 and is arranged on fatigue tester lower bottom base 10 by vertical test bracket 1, air pressure starts the vertical clamping of nut lock compact form trapezoid cross section fixture 2 and is held sample 3, be held sample 3 bottoms and be provided with eccentric wheel Vib. 4, eccentric wheel Vib. 4 is connecting eccentric wheel 5 successively, external frequency converter 6, external frequency converter 6 is controlled unlatching by motor 7, reach the controlled object of frequency, be held sample 3 bottoms respectively with capacity strain gage 8, current vortex precise displacement sensor 9 connects.
Wherein air pressure startup nut lock compact form trapezoid cross section fixture 2 comprises shell, cylinder 11, piston 12, stopper rod 13, set nut 14, connecting link 15, fine-tuning nut I 16, stick harness 17, fine-tuning nut II 18 and trapezoid cross section clamper 19, it is symmetrical structure that this air pressure starts nut lock compact form trapezoid cross section fixture 2, wherein half of housing exterior is provided with the cylinder 11 connecting successively, piston 12, stopper rod 13, half of enclosure from central symmetry axis to be provided with the trapezoid cross section clamper 19 connecting successively, stick harness 17, connecting link 15, stopper rod 13 is positioned at same level position with connecting link 15, trapezoid cross section clamper 19 is connected with stick harness 17 by fine-tuning nut II 18, and stick harness 17 is connected with connecting link 15 by fine-tuning nut I 16, and connecting link 15 is arranged on shell by set nut 14.
Claims (3)
1. a cellular board fatigue test device, it is characterized in that: comprise vertical test bracket (1), air pressure starts nut lock compact form trapezoid cross section fixture (2), eccentric wheel Vib. (4), eccentric wheel (5), frequency converter (6), motor (7), capacity strain gage (8), current vortex precise displacement sensor (9) and fatigue tester lower bottom base (10), described air pressure starts nut lock compact form trapezoid cross section fixture (2) and is arranged on fatigue tester lower bottom base (10) by vertical test bracket (1), air pressure starts the vertical clamping of nut lock compact form trapezoid cross section fixture (2) and is held sample (3), be held sample (3) bottom and be provided with eccentric wheel Vib. (4), eccentric wheel Vib. (4) is connecting eccentric wheel (5) successively, external frequency converter (6), external frequency converter (6) is controlled and is opened by motor (7), be held sample (3) bottom respectively with capacity strain gage (8), current vortex precise displacement sensor (9) connects.
2. cellular board fatigue test device according to claim 1, it is characterized in that: described air pressure starts nut lock compact form trapezoid cross section fixture (2) and comprises shell, cylinder (11), piston (12), stopper rod (13), set nut (14), connecting link (15), fine-tuning nut I (16), stick harness (17), fine-tuning nut II (18) and trapezoid cross section clamper (19), it is symmetrical structure that this air pressure starts nut lock compact form trapezoid cross section fixture (2), wherein half of housing exterior is provided with the cylinder (11) connecting successively, piston (12), stopper rod (13), half of enclosure from central symmetry axis to be provided with the trapezoid cross section clamper (19) connecting successively, stick harness (17), connecting link (15), stopper rod (13) is positioned at same level position with connecting link (15).
3. cellular board fatigue test device according to claim 2, it is characterized in that: described trapezoid cross section clamper (19) is connected with stick harness (17) by fine-tuning nut II (18), stick harness (17) is connected with connecting link (15) by fine-tuning nut I (16), and connecting link (15) is arranged on shell by set nut (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420179712.XU CN203811470U (en) | 2014-04-15 | 2014-04-15 | Cellular board fatigue testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420179712.XU CN203811470U (en) | 2014-04-15 | 2014-04-15 | Cellular board fatigue testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203811470U true CN203811470U (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420179712.XU Withdrawn - After Issue CN203811470U (en) | 2014-04-15 | 2014-04-15 | Cellular board fatigue testing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN203811470U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969114A (en) * | 2014-04-15 | 2014-08-06 | 昆明理工大学 | Fatigue testing device of honeycomb panel and testing method |
| CN106932270A (en) * | 2017-04-25 | 2017-07-07 | 沈阳建筑大学 | A kind of test fixture and its application method for simply supported beam fatigue loading |
-
2014
- 2014-04-15 CN CN201420179712.XU patent/CN203811470U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969114A (en) * | 2014-04-15 | 2014-08-06 | 昆明理工大学 | Fatigue testing device of honeycomb panel and testing method |
| CN103969114B (en) * | 2014-04-15 | 2016-02-10 | 昆明理工大学 | A kind of cellular board fatigue test device and method of testing |
| CN106932270A (en) * | 2017-04-25 | 2017-07-07 | 沈阳建筑大学 | A kind of test fixture and its application method for simply supported beam fatigue loading |
| CN106932270B (en) * | 2017-04-25 | 2023-06-06 | 沈阳建筑大学 | Test fixture for fatigue loading of simply supported beams and application method of test fixture |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20160210 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20160210 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |