CN205192441U - Two -way test sensor that meets an emergency of cylindrical experimental test piece based on fiber grating - Google Patents
Two -way test sensor that meets an emergency of cylindrical experimental test piece based on fiber grating Download PDFInfo
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- CN205192441U CN205192441U CN201520964823.6U CN201520964823U CN205192441U CN 205192441 U CN205192441 U CN 205192441U CN 201520964823 U CN201520964823 U CN 201520964823U CN 205192441 U CN205192441 U CN 205192441U
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- fiber grating
- hoop
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- cylindrical
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- 239000000835 fiber Substances 0.000 title claims abstract description 119
- 238000012360 testing method Methods 0.000 title claims abstract description 109
- 238000009434 installation Methods 0.000 claims description 11
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 5
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 5
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- 239000000463 material Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 239000011384 asphalt concrete Substances 0.000 abstract 1
- 239000010426 asphalt Substances 0.000 description 15
- 238000005259 measurement Methods 0.000 description 12
- 238000013461 design Methods 0.000 description 8
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Abstract
The utility model provides a two -way test sensor that meets an emergency of cylindrical experimental test piece based on fiber grating belongs to road experimental facilities field. Hoop fiber grating centers on via hoop fiber grating fixing device hoop and is fixed in cylindrical experimental test piece hoop cross section, and vertical fiber grating is fixed in the cylindrical vertical outside of experimental test piece via vertical fiber grating top fixing device and vertical fiber grating bottom fixing device. Hoop fiber grating, vertical fiber grating link to each other with data acquisition system respectively. The utility model discloses utilize that the volume of fiber grating own is light and handy, the pliability good, high temperature resistant, adopt the characteristics that several frequencies are high for in the cylindrical asphalt concrete test piece sound attitude load test, remedy general deformation sensor and be out of shape to the hoop and measuration, and the high frequency dynamic procedure function limitation of measurationing, be out of shape circular cross section's hoop and carry out effectively measurationing of high -frequency, high accuracy, solve the cylinder test piece and moving the technological problem who carries vertical, hoop deformation down and measuration in step.
Description
Technical field
The utility model belongs to roadway experiment apparatus field, and what relate to is that fiber grating measurement technology is applied to asphalt test block shop experiment by one; Compatibility test machine loads, and measures in real time vertical, side direction (two-way) response of bitumen mixture specimen under dynamic loads, complex loading history, thus obtains the experimental technique of corresponding dynamic mechanics parameter.
Background technology
The needs that in this measurement technology can meet, vertical, the transversely deforming (strain) of asphalt under set point of temperature, load mode (static load, dynamic load, complex loading), sample frequency require are measured, according to the difference of Loaded contact analysis and loading frequency, can regulate the sample frequency of data; The dynamic mechanics parameter being calculated bitumen mixture specimen by the test figure of fiber-optic grating sensor (comprises dynamic modulus E
*, dynamic Poisson's ratio μ
*).Meanwhile, under can loading complicated wave form in test as required, the data acquisition of overall process is carried out in the distortion of compound test specimen, thus meets the research needs for asphalt Viscoelastic Mechanics characteristic, improves the predicament that these aspect development test means lack.
With the stable development of China economy, the construction of high-grade highway has welcome again a new period; Particularly under the overall situation of economic construction, every profession and trade proposes new, higher requirement to traffic and transportation system; Outstanding behaviours carries the raising of level in the growth of the volume of traffic and axle.Therefore, for realizing effective running of transport by road system, the service level of high-grade highway must be ensured; This just requires, for the needs of pavement structure function under new environment and a series of early damage to pavement phenomenons of being caused by new change, to carry out researching and analysing of science, improves the deficiency in current design methods.Therefore, new, effective research technique is proposed and research method becomes a kind of exigence.
The Current Specification of Asphalt Pavement Design (JTGD50 ?2006) promulgated for 06 year, encounters some limitations in application process; Particularly perform poor for the control aspect of pavement structure permanent strain under high temperature the most general now, local function.In addition, the sticky ?bullet mechanical characteristic of asphalt itself also well could not embody in method for designing and testing regulations.For this point, within 11 years, promulgate new Asphalt Mixture Experiment code (JTGE20 ?2011), its principal feature has used for reference the more external determination test about asphalt dynamic mechanics parameter, resists the ability of permanent strain in conjunction with Theory of Viscoelasticity analysis of material under high temperature heavy load.But new Pavement Structure Design specification is not slowly promulgated, important reason is due to for the new research starting point and new design parameter, need be convenient to engineer applied, effective measurement means are coordinated, and existing most test method is based on empirical, this encounters very large difficulty with regard to the combination causing test index and parameter of structure design.
Become today of main flow at asphalt dynamic mechanical analysis, a lot of scholar is to by dynamic modulus E
*introduce Structure Calculation and carried out deep analysis, but relate to seldom for the analysis of another important mechanics parameter Poisson ratio μ, the Poisson ratio μ particularly shown under dynamic load
*measuring and analyzing be almost blank out; Its reason is the measurement of compound test specimen lateral deformation under dynamic load will realize overall process measurement when control temperature, loading frequency, there are a lot of technological difficulties.For asphalt, it is very large to carry out ordinary triaxial test difficulty; Existing test specification only relates to static Poisson ratio but not dynamic load is measured, and the test method of employing is indirectly stretch, and by measuring horizontal, the longitudinal strain in test specimen cross section, calculates the typical value of Poisson ratio.But the method only considers the approximation method of an a certain local of plane, and itself exists limitation, and operation is more loaded down with trivial details.
It is simple, clear that shop experiment due to column type test specimen has stress form, and be easy to the advantage that same theory combines, and becomes the first-selection of mechaanical property of materials research experiment.In addition, it is good that fiber grating element has pliability, high temperature resistant, and the feature that data acquiring frequency is high, therefore by the cylindrical surface of fiber grating laying element in bitumen mixture specimen, the data acquisition under assigned temperature and frequency can be realized; Therefore adopt grating measurement technology to load in conjunction with universal testing machine just can realize that asphalt under dynamic load is vertical, measure while lateral deformation response, thus acquisition dynamic Poisson's ratio μ *; This measurement technology is not only applicable to asphalt, applicable equally for other circular cylindrical solid material test specimen, and testing equipment Element Design light and handy, simple to operate and be easy to application.
Utility model content
The purpose of this utility model is to provide a kind of based on fiber grating high precision strain testing technology, tests that cylindrical test test specimen is vertical, the sensor of the two-way dynamic static strain of hoop simultaneously.
The technical solution of the utility model:
The two-way strain testing sensor of cylindrical test test specimen based on fiber grating, test the sensor of the two-way dynamic static strain of the vertical and hoop of cylindrical test test specimen simultaneously, comprise fiber grating, fiber grating grip block, vertical fiber grating top fixture, vertically fiber grating base fixture and hoop fiber grating stationary installation; Vertical fiber grating top fixture comprises test specimen and loads upper cover, vertical degree of tightness setting nut and top fixed dam; Vertical fiber grating base fixture comprises bottom fixed dam and test piece base; Hoop fiber grating stationary installation comprises degree of tightness regulation and control nut and hoop fiber grating fixture; According to the length of cylindrical test test specimen, by fiber grating grip block grip optical fiber grating two ends; Hoop fiber grating is through hoop fiber grating stationary installation hoop around being fixed on cylindrical test test specimen hoop xsect, and vertical fiber grating is fixed on the vertical outside of cylindrical test test specimen through vertical fiber grating top fixture and vertical fiber grating base fixture; Hoop fiber grating is connected with data acquisition system (DAS) respectively with vertical fiber grating;
Hoop fiber grating part: by hoop fiber grating hoop around cylindrical test test specimen hoop xsect; The distance of hoop fiber grating fixture two ends cantilever is reduced by rotating degree of tightness regulation and control nut, the fiber grating grip block that hoop fiber grating two ends are stretched out is embedded in the two ends of cantilever, rotate the distance that degree of tightness regulation and control nut increases hoop fiber grating cantilever two ends, make to be reversed tension around the hoop fiber grating on cylindrical test test specimen, controlled in real time by hoop fiber grating data acquisition equipment;
Vertical fiber grating part: the fiber grating grip block at vertical fiber grating two ends is individually fixed in the top fixed dam on cylindrical test test specimen and bottom fixed dam, and by regulating the vertical degree of tightness setting nut on top fixed dam to make vertical fiber grating possess prestrain, prestrain size experimentally in the vertical deformation total amount that will produce determine.
Hoop fiber grating fixture can the cantilever of relative sliding be made up of two overlaps, is regulated the relative position of two cantilevers by the rotating nut of junction, changes cantilever two ends relative distance, and tension institute set collar is to fiber grating.
Fiber grating grip block adopts fiber-reinforced plastic (FRP, FiberReinforcedPolymer), epoxide resin material or weld metal make, and vertical fiber grating top fixture, vertical fiber grating base fixture and hoop fiber grating stationary installation adopt metal or fiber-reinforced plastic to make.
The quantity of vertical fiber grating and hoop fiber grating needs to increase and decrease according to actual experiment, is realized by the usage quantity of the reserved hole count and hoop fiber grating stationary installation that change vertical fiber grating top fixture and vertical fiber grating base fixture.
The beneficial effects of the utility model: the two-way strain testing sensor of this cylindrical test test specimen is by around the ring side of fiber grating being fixed on cylindrical test test specimen, and adjusting elasticity makes optical grating element consistent with test piece deformation, thus measures circumferential deformation; By base and capping device in order to vertical fixed fiber grating, pretension grating provides space for vertical deformation measurement, makes optical grating element replacing for convenience detach simultaneously or recycles.The utility model utilizes that the volume of fiber grating own is light and handy, pliability good, high temperature resistant, adopt the high feature of several frequency, in the middle of cylindrical bituminous concrete test specimen sound state load test, make up general deformation-sensor circumferential deformation is measured, and the function limitation that high frequency dynamic process measures, high-frequency, high-precision effective measurement are carried out to the circumferential deformation of round section, and then solution right cylinder test specimen is vertical under dynamic load, the technical barrier of circumferential deformation synchronous measure.The deformation information of vertical, the hoop under the cylinder specimen dynamic load that the utility model obtains, on the one hand can as dynamic mechanics parameter (E
*, μ
*) measurement means, also may be used for that bituminous concrete test specimen is vertical under complicated loads, the measurement of hoop overall process deformation information, for the Viscous Elastic Mechanics characteristic of Research on Asphalt Mixture.
Accompanying drawing explanation
Fig. 1 is the cylindrical test test specimen two-way strain testing sensor construction schematic diagram based on fiber grating.
Fig. 2 is that hoop fiber grating fixes schematic diagram.
Fig. 3 (a) is hoop fiber grating stationary installation.
Fig. 3 (b) is hoop fiber grating stationary installation exploded view.
Fig. 4 is vertical fiber grating top fixture.
Fig. 5 is vertical fiber grating base fixture.
In figure: 1 test specimen loads upper cover; 2 vertical degree of tightness setting nuts; 3 fiber grating grip blocks; 4 top fixed dams; 5 cylindrical test test specimens; 6 vertical fiber gratings; 7 hoop fiber gratings; 8 degree of tightness regulation and control nuts; 9 hoop fiber grating fixtures; Fixed dam bottom 10; 11 test piece base.
Embodiment
The embodiment of utility model is described in detail below in conjunction with technical scheme and accompanying drawing.
Embodiment
The two-way strain testing sensor of cylindrical test test specimen based on fiber grating is based on fiber grating measurement technology, by the top of design, bottom and hoop device, fiber-optic grating sensor is fixed on hoop and the side direction of cylindrical test test specimen; As shown in drawings, assembly mainly comprises hoop sensor fastening device (Fig. 1,2,3) and vertical sensor fastening device (Fig. 1,4,5); Data acquisition equipment and test oil (gas) filling device figure are slightly.
Before device assembles, fiber grating grip block 3 is utilized to do clamping process according to design length two ends required fiber grating.
The assembling mode of hoop fiber-optic grating sensor is: by hoop fiber grating 7 hoop around cylindrical test test specimen 5 hoop xsect; The distance of hoop fiber grating fixture 9 two ends cantilever is reduced by rotating degree of tightness regulation and control nut 8, the fiber grating grip block 3 that hoop fiber grating 7 two ends are stretched out can be embedded in the two ends of cantilever, rotate the distance that degree of tightness regulation and control nut 8 increases element cantilever two ends afterwards, make to be reversed tension around the hoop fiber grating 7 above cylindrical test test specimen 5, degrees of tensions can be controlled in real time by fiber grating data acquisition equipment;
The assembling mode of vertical fiber-optic grating sensor is: the fiber grating grip block 3 at vertical fiber grating 6 two ends is individually fixed in the top fixed dam 4 of test specimen top fixture and base fixture and the upper and lower of bottom fixed dam 10, makes fiber grating element possess prestrain (prestrain size experimentally in the vertical deformation total amount that will produce determine) at the test initial stage by regulating the vertical degree of tightness setting nut 2 in top fixture;
Finally, by hoop fiber grating, vertical fiber-optic grating sensor with data acquisition system (DAS) be connected, with synchronous acquisition experimental data.And the test specimen assembled is placed in the environmental cabinet of testing machine, tested by Control experiment temperature and load mode.
Claims (2)
1. the two-way strain testing sensor of the cylindrical test test specimen based on fiber grating, it is characterized in that, this cylindrical test test specimen two-way strain testing sensor is the sensor of the two-way dynamic static strain simultaneously testing the vertical and hoop of cylindrical test test specimen, comprises fiber grating, fiber grating grip block, vertical fiber grating top fixture, vertically fiber grating base fixture and hoop fiber grating stationary installation; Vertical fiber grating top fixture comprises test specimen and loads upper cover, vertical degree of tightness setting nut and top fixed dam; Vertical fiber grating base fixture comprises bottom fixed dam and test piece base; Hoop fiber grating stationary installation comprises degree of tightness regulation and control nut and hoop fiber grating fixture; According to the length of cylindrical test test specimen, by fiber grating grip block grip optical fiber grating two ends; Hoop fiber grating is through hoop fiber grating stationary installation hoop around being fixed on cylindrical test test specimen hoop xsect, and vertical fiber grating is fixed on the vertical outside of cylindrical test test specimen through vertical fiber grating top fixture and vertical fiber grating base fixture; Hoop fiber grating is connected with data acquisition system (DAS) respectively with vertical fiber grating;
Hoop fiber grating part: by hoop fiber grating hoop around cylindrical test test specimen hoop xsect; The distance of hoop fiber grating fixture two ends cantilever is reduced by rotating degree of tightness regulation and control nut, the fiber grating grip block that hoop fiber grating two ends are stretched out is embedded in the two ends of cantilever, rotate the distance that degree of tightness regulation and control nut increases hoop fiber grating cantilever two ends, make to be reversed tension around the hoop fiber grating on cylindrical test test specimen, controlled in real time by hoop fiber grating data acquisition equipment; Described hoop fiber grating fixture can the cantilever of relative sliding be made up of two overlaps, is regulated the relative position of two cantilevers by the rotating nut of junction, changes cantilever two ends relative distance, and tension institute set collar is to fiber grating;
Vertical fiber grating part: the fiber grating grip block at vertical fiber grating two ends is individually fixed in the top fixed dam on cylindrical test test specimen and bottom fixed dam, and by regulating the vertical degree of tightness setting nut on the fixed dam of top to make vertical fiber grating possess prestrain, prestrain is determined according to the vertical deformation total amount produced.
2. the two-way strain testing sensor of cylindrical test test specimen according to claim 1, is characterized in that, described fiber grating grip block adopts fiber-reinforced plastic, epoxide resin material or weld metal to make; Vertical fiber grating top fixture, vertical fiber grating base fixture and hoop fiber grating stationary installation adopt metal or fiber-reinforced plastic to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964823.6U CN205192441U (en) | 2015-11-27 | 2015-11-27 | Two -way test sensor that meets an emergency of cylindrical experimental test piece based on fiber grating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964823.6U CN205192441U (en) | 2015-11-27 | 2015-11-27 | Two -way test sensor that meets an emergency of cylindrical experimental test piece based on fiber grating |
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| Publication Number | Publication Date |
|---|---|
| CN205192441U true CN205192441U (en) | 2016-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520964823.6U Expired - Fee Related CN205192441U (en) | 2015-11-27 | 2015-11-27 | Two -way test sensor that meets an emergency of cylindrical experimental test piece based on fiber grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018253A (en) * | 2016-07-11 | 2016-10-12 | 兰州理工大学 | Multifunctional monitoring device for corrosion damage of underground concrete structure |
| CN112857988A (en) * | 2021-01-29 | 2021-05-28 | 中国科学院武汉岩土力学研究所 | Asymmetric load loading test system and test method for full-scale test of pipe piece |
-
2015
- 2015-11-27 CN CN201520964823.6U patent/CN205192441U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018253A (en) * | 2016-07-11 | 2016-10-12 | 兰州理工大学 | Multifunctional monitoring device for corrosion damage of underground concrete structure |
| CN106018253B (en) * | 2016-07-11 | 2018-11-13 | 兰州理工大学 | A kind of multi-functional underground concrete structure corrosion damage monitoring device |
| CN112857988A (en) * | 2021-01-29 | 2021-05-28 | 中国科学院武汉岩土力学研究所 | Asymmetric load loading test system and test method for full-scale test of pipe piece |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Shujuan Inventor after: Liu Wanqiu Inventor after: Yan Qiubo Inventor after: Liu Xu Inventor after: Chen Zhiguo Inventor after: Qin Weijun Inventor after: Yu Limei Inventor after: Wang Boshi Inventor before: Wang Shujuan Inventor before: Liu Wanqiu Inventor before: Liu Xu Inventor before: Chen Zhiguo Inventor before: Qin Weijun Inventor before: Yu Limei Inventor before: Wang Boshi |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Shujuan Inventor after: Liu Wanqiu Inventor after: Yan Qiubo Inventor after: Liu Xu Inventor after: Chen Zhiguo Inventor after: Qin Weijun Inventor after: Yu Limei Inventor after: Wang Boshi Inventor before: Wang Shujuan Inventor before: Liu Wanqiu Inventor before: Yan Qiubo Inventor before: Liu Xu Inventor before: Chen Zhiguo Inventor before: Qin Weijun Inventor before: Yu Limei Inventor before: Wang Boshi |
|
| COR | Change of bibliographic data | ||
| 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: 20160427 |