CN204405306U - Fatigue life gage caliberating device - Google Patents
Fatigue life gage caliberating device Download PDFInfo
- Publication number
- CN204405306U CN204405306U CN201520016179.XU CN201520016179U CN204405306U CN 204405306 U CN204405306 U CN 204405306U CN 201520016179 U CN201520016179 U CN 201520016179U CN 204405306 U CN204405306 U CN 204405306U
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- CN
- China
- Prior art keywords
- fatigue life
- life gage
- fatigue
- gage
- riveted structure
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Abstract
The utility model discloses a kind of fatigue life gage caliberating device, comprise fatigue life gage, also comprise fatigue tester and foil gauge, the specimen holder that can clamp riveted structure testpieces is installed in described fatigue tester, described fatigue life gage fits on the riveted structure testpieces that can be clamped on specimen holder by strain multiplier, described fatigue life gage is electrically connected with resistance measuring instrument, described foil gauge also fits on the riveted structure testpieces that can be clamped on specimen holder, and described foil gauge is electrically connected with tired recording geometry by strain amplifier.Adopt fatigue life gage caliberating device of the present utility model, can facilitate, effectively fatigue life gage be demarcated.
Description
Technical field
The utility model relates to a kind of detecting instrument, particularly relates to a kind of detecting instrument for demarcating fatigue life gage.
Background technology
Riveted structure is a kind of important form in mechanical connecting structure, particularly in the syndeton of aircraft components, riveted structure uses more general, the load that aircraft bears mainly is transmitted by link, its connecting portion easily produces larger stress and concentrates, therefore connecting portion is the main positions that tired unstability occurs aircaft configuration, and according to statistics, nearly the fatigure failure of 75% ~ 80% occurs in the connecting portion of housing construction.Therefore the fatigue of aircraft web member, damage tolerance design are primary study contents in airplane design, it is also very necessary for monitoring the fatigue of aircraft connecting portion simultaneously, but this major part research all rests on laboratory examination conceptual phase, the fatigue of little energy research aircraft in operational process is monitored in real time, and fatigue life gage makes the research in this direction become possibility.But to fatigue life gage be used to predict remanent fatigue life accurately in the structure of reality, first to carry out the resistance variation characteristic calibration curve under permanent width alternate strain to fatigue life gage, obtain the funtcional relationship between resistance change Δ R and alternate strain width ε a and cycle index N.Still lack at present effectively for the demarcation test macro of the fatigue life gage of the demarcation test macro, particularly aircraft web member place of fatigue life gage.
Utility model content
For the above-mentioned deficiency existing for prior art, technical problem to be solved in the utility model is to provide a kind of fatigue life gage caliberating device, and it can facilitate, effectively demarcate fatigue life gage.
In order to solve the problems of the technologies described above, a kind of fatigue life gage caliberating device of the present utility model, comprise fatigue life gage, also comprise fatigue tester and foil gauge, the specimen holder that can clamp riveted structure testpieces is installed in described fatigue tester, described fatigue life gage fits on the riveted structure testpieces that can be clamped on specimen holder by strain multiplier, described fatigue life gage is electrically connected with resistance measuring instrument, described foil gauge also fits on the riveted structure testpieces that can be clamped on specimen holder, described foil gauge is electrically connected with tired recording geometry by strain amplifier.
In said structure, owing to also comprising fatigue tester in this fatigue life gage caliberating device, the specimen holder that can clamp riveted structure testpieces is installed in described fatigue tester, then fatigue tester can clamp riveted structure testpieces by specimen holder, riveted structure testpieces is applied to have suitable alternate strain amount and the alternate load of cycle index, thus calibration measurements can be carried out to this riveted structure testpieces, again because described fatigue life gage to fit on the riveted structure testpieces can be clamped on specimen holder by strain multiplier, described fatigue life gage is electrically connected with resistance measuring instrument, then in calibration measurements process, the change of riveted structure testpieces resistance that fatigue life gage reflects under alternate strain can be measured by resistance measuring instrument, and fatigue life gage is fitted in by strain multiplier on the riveted structure testpieces that can be clamped on specimen holder and the dependent variable of riveted structure testpieces can be amplified, thus plastic strain amplitude can be solved lower than resistance value unconverted situation during fatigue life gage strain threshold value, obtain wider test data, again owing to also comprising foil gauge in this fatigue life gage caliberating device, described foil gauge also fits on the riveted structure testpieces that can be clamped on specimen holder, described foil gauge is electrically connected with tired recording geometry by strain amplifier, then can measure by tired recording geometry the alternate strain width ε a and Cyclic Strain times N that foil gauge under the alternate strain that riveted structure testpieces applies at fatigue tester reflects, and described foil gauge is electrically connected the accuracy that can improve reading strain by strain amplifier with tired recording geometry.
Pass through said apparatus, alternate strain width ε a suffered by riveted structure testpieces and Cyclic Strain times N and the increased resistance value of fatigue life gage under this alternate strain width ε a and the effect of Cyclic Strain times N can be measured, again by corresponding process, just can obtain the funtcional relationship between the resistance change Δ R of fatigue life gage and alternate strain width ε a and cycle index N, thus conveniently, effectively complete the demarcation to fatigue life gage.
A kind of preferred implementation of the present utility model, described fatigue life gage fits on riveted structure testpieces between two rivets by strain multiplier, and described foil gauge to fit on the riveted structure testpieces below fatigue life gage between two rivets.Adopt this embodiment, can ensure to demarcate the consistance of environment and in the future fatigue life gage applied environment, between the rivet that demarcated fatigue life gage is used in reality, this testing result the most easily producing the position of fatigure failure is the most accurate.
Another kind of preferred implementation of the present utility model, described fatigue tester is hydraulic servo fatigue tester.Adopt this embodiment, the frequency range that hydraulic servo fatigue tester provides can well adapt to the testing requirements of aircraft components riveted structure.
Another preferred implementation of the present utility model, described resistance measuring instrument is desk type digital universal meter.Adopt this embodiment, desk type digital universal meter resolution be high, reading is accurate, multiple functional, easy to use, measuring accuracy can be ensured better.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.
Fig. 1 is the structural representation of the utility model fatigue life gage caliberating device;
Fig. 2 is the enlarged diagram of riveted structure testpieces and calibration measurements part thereof in structure shown in Fig. 1.
In figure: 1-fatigue tester, 2-specimen holder, 3-riveted structure testpieces, 4-fatigue life gage, 5-strain multiplier, 6-foil gauge, 7-tired recording geometry, 8-resistance measuring instrument, 9-strain amplifier.
Embodiment
In the fatigue life gage caliberating device shown in Fig. 1, described fatigue tester 1 is hydraulic servo fatigue tester, fatigue tester 1 is provided with specimen holder 2, riveted structure testpieces 3 is arranged on specimen holder 2, fatigue tester 1 applies to have suitable alternate strain amount and the alternate load of cycle index by specimen holder 2 pairs of riveted structure testpieces 3, thus can carry out calibration measurements to this riveted structure testpieces 3.
In the enlarged diagram of the riveted structure testpieces 3 shown in Fig. 2 and calibration measurements part thereof, fatigue life gage 4 is fitted on strain multiplier 5, and to be fitted on the riveted structure testpieces 3 that can be clamped on specimen holder 2 between rivet by strain multiplier 5, fatigue life gage 4 is electrically connected with resistance measuring instrument 8, resistance measuring instrument 8 adopts desk type digital universal meter, can certainly adopt the resistance apparatus of other form; Also be fitted with foil gauge 6 caning be clamped on the riveted structure testpieces 3 on specimen holder 2, its position to be on the riveted structure testpieces 3 below fatigue life gage 4 between two rivets, foil gauge 6 is electrically connected with strain amplifier 9, and strain amplifier 9 is electrically connected with tired recording geometry 7.
In calibration measurements process, tired recording geometry 7 measures by foil gauge 6 the alternate strain width ε a and Cyclic Strain times N that foil gauge 6 under the alternate strain that riveted structure testpieces 3 applies at fatigue tester 1 reflects, the resistance change Δ R of fatigue life gage 4 is recorded by resistance measuring instrument 8, cycle index N is got one group of fixed value, just the relation curve of one group of Δ R ~ ε a can be obtained like this under the circulation cycle that each is predetermined, Δ R ~ ε a data of fatigue life gage 4 on each sample are painted in Δ R ~ ε a coordinate system, and the relation curve of resistance change Δ R and alternate strain width ε a is obtained by each fixed cycles value matching, relation curve race thus, fixing dependent variable just obtains resistance change from the relation data with cycle index N, getting dependent variable is the calibration curve that standard value just obtains fatigue life gage, i.e. Δ R ~ N relation curve.
Below embodiments more of the present utility model are only listed, but the utility model is not limited in this, more improvement and conversion can also be made, as described in fatigue tester 1 may not be and adopt hydraulic servo fatigue tester, but adopt machinery or motor-driven fatigue tester; Resistance measuring instrument 8 also can adopt the resistance apparatus of other form.And so on, as long as improvement done on the utility model ultimate principle basis and conversion, all should be considered as falling in protection domain of the present utility model.
Claims (4)
1. a fatigue life gage caliberating device, comprise fatigue life gage (4), it is characterized in that: also comprise fatigue tester (1) and foil gauge (6), the specimen holder (2) that can clamp riveted structure testpieces (3) is installed in described fatigue tester (1), described fatigue life gage (4) fits on the riveted structure testpieces (3) that can be clamped on specimen holder (2) by strain multiplier (5), described fatigue life gage (4) is electrically connected with resistance measuring instrument (8), described foil gauge (6) also fits on the riveted structure testpieces (3) that can be clamped on specimen holder (2), described foil gauge (6) is electrically connected with tired recording geometry (7) by strain amplifier (9).
2. fatigue life gage caliberating device according to claim 1, it is characterized in that: described fatigue life gage (4) fits between upper two rivets of riveted structure testpieces (3) by strain multiplier (5), described foil gauge (6) fits between upper two rivets of riveted structure testpieces (3) of fatigue life gage (4) below.
3. fatigue life gage caliberating device according to claim 1, is characterized in that: described fatigue tester (1) is hydraulic servo fatigue tester.
4. fatigue life gage caliberating device according to claim 1, is characterized in that: described resistance measuring instrument (8) is desk type digital universal meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520016179.XU CN204405306U (en) | 2015-01-09 | 2015-01-09 | Fatigue life gage caliberating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520016179.XU CN204405306U (en) | 2015-01-09 | 2015-01-09 | Fatigue life gage caliberating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204405306U true CN204405306U (en) | 2015-06-17 |
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ID=53429156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520016179.XU Expired - Fee Related CN204405306U (en) | 2015-01-09 | 2015-01-09 | Fatigue life gage caliberating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204405306U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675413A (en) * | 2016-01-18 | 2016-06-15 | 伟创力制造（珠海）有限公司 | Method of evaluating stress life of circuit board |
| CN109766623A (en) * | 2019-01-04 | 2019-05-17 | 大连理工大学 | The disc type strain multiplier and design method that machinery part surface strain is amplified in real time under multiaxial loading |
| CN109780988A (en) * | 2019-01-04 | 2019-05-21 | 大连理工大学 | The star-like cantilevered strain multiplier and design method that the strain of Multi-axial Loading machinery part surface is amplified in real time |
-
2015
- 2015-01-09 CN CN201520016179.XU patent/CN204405306U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675413A (en) * | 2016-01-18 | 2016-06-15 | 伟创力制造（珠海）有限公司 | Method of evaluating stress life of circuit board |
| CN105675413B (en) * | 2016-01-18 | 2019-12-10 | 伟创力制造（珠海）有限公司 | method for evaluating stress life of circuit board |
| CN109766623A (en) * | 2019-01-04 | 2019-05-17 | 大连理工大学 | The disc type strain multiplier and design method that machinery part surface strain is amplified in real time under multiaxial loading |
| CN109780988A (en) * | 2019-01-04 | 2019-05-21 | 大连理工大学 | The star-like cantilevered strain multiplier and design method that the strain of Multi-axial Loading machinery part surface is amplified in real time |
| CN109766623B (en) * | 2019-01-04 | 2023-04-07 | 大连理工大学 | Disc type strain multiplier for amplifying surface strain of mechanical part under multi-axis load in real time and design method |
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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 |
Granted publication date: 20150617 Termination date: 20160109 |