CN105136086B - Measure the sensor of composite construction contact status between layers - Google Patents
Measure the sensor of composite construction contact status between layers Download PDFInfo
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- CN105136086B CN105136086B CN201510434136.8A CN201510434136A CN105136086B CN 105136086 B CN105136086 B CN 105136086B CN 201510434136 A CN201510434136 A CN 201510434136A CN 105136086 B CN105136086 B CN 105136086B
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Abstract
The present invention provides a kind of sensor for measuring composite construction contact status between layers, the composite construction includes adjacent first layer and the second layer, the sensor includes sensing core and a shell, the shell is located in the first layer of composite construction, and the sensing core has the first end being fixedly linked with the second layer of composite construction, the second end being fixedly connected with the shell and the body in the shell；The surface of the sensing core is provided with multiple foil gauges, and the foil gauge is close to the first end.The present invention can measure sliding and the disengaged condition of large complex structure interlayer simultaneously, and can reflect the time of day of composite construction interlayer multi-C stereo by setting foil gauge in sensing wicking surface；Low manufacture cost, it is easily installed, measurement is simple, is easy to apply.
Description
Technical field
The present invention relates to a kind of structural mechanics field, more particularly to a kind of biography for measuring composite construction contact status between layers
Sensor.
Background technology
Because composite construction can make full use of the physico mechanical characteristic of different materials, there is big rigidity, anti-high pressure, intensity
The advantages of height, good endurance, therefore composite construction is popular in fields such as building, machinery, Aero-Space, chemistry.
However, large complex structure inevitably by the impact load, temperature load, environmental attack in daily military service
Etc. complicated mechanical behavior so that composite construction under arms during in a kind of continually changing random multidimensional stress.This
The complicated multidimensional stress of kind causes the time of day of composite construction unpredictable and calculated；Particularly in production, processing, fortune
In defeated and installation or work progress, composite construction is not only by static load, also by increasingly complex dynamic load.Cause
This, composite construction needs to be monitored the contact condition of large complex structure interlayer during production and processing and operation.
The displacement transducer for being currently used for measuring composite construction has interior mode optical fibre displacement sensor and external regulation type optical fiber position
Displacement sensor (Wang Guanghui, application [A] the material engineering of Yuan state green grass or young crops .FBG sensors on composite material structure health monitoring,
2010, increase 1：110-115；Glass fiber compound material layers of Shen Weiliang, Zhu Qirong, the Xie Ming such as based on fiber-optic grating sensor
Between strain testing experimental analysis [J] mechanics quarterly, 2013,03:463-469).Interior mode optical fibre displacement sensor utilizes micro-
Curved effect reflects the change of measured physical quantity, according to the functional relation between light intensity and measured physical quantity come quantitative description physics
The change of amount.The method system complex, the dynamic range of displacement measurement is small, and high to requirement on machining accuracy, mode is cumbersome, and engineering should
With less.External regulation type optical fibre displacement sensor identifies the change of physical quantity by luminous flux.Interior mode and external regulation type optical fiber position
Displacement sensor is commonly used to measure displacement measurement between metal composite layer, is needed in the composite construction being mingled with containing greater particle size
Make specially treated, and measurement effect fluctuation is larger.
It is, therefore, desirable to provide it is a kind of new dedicated for measuring the sensor of large complex structure contact status between layers,
The sliding of composite construction interlayer and disengaged condition can be reflected, be used not only for measurement composite construction and producing and processing
During interlayer state, moreover it is possible to monitor contact status between layers of the composite construction in operation, especially, can measure large-scale multiple
Close the 3 D stereo variable condition of structure interlayer.
The content of the invention
In view of the above the shortcomings that prior art, the technical problem to be solved in the present invention is that providing one kind is easily installed
Measurement composite construction contact status between layers sensor, can relatively accurately measure the disengagement and sliding of composite construction interlayer
State.
To achieve the above object, the present invention provides a kind of sensor for measuring composite construction contact status between layers, described multiple
Closing structure includes adjacent first layer and the second layer, and the sensor includes sensing core and a shell, and the shell is positioned at compound
In the first layer of structure, the sensing core has the first end being fixedly linked with the second layer of composite construction, consolidated with the shell
Surely the second end connected and the body in the shell；The surface of the sensing core is provided with multiple foil gauges, described to answer
Become piece close to the first end.
Preferably, the cross section of the sensing core is square, has four sides, the length of the sensing core is L, horizontal
The length of side in section is a, and L/a is more than 4.
Preferably, the foil gauge has 4, is respectively adhered on four sides of sensing core.
Preferably, the foil gauge is provided with wire, and the wire is drawn from the composite construction.
Preferably, be embedded with fixture in the second layer of the composite construction, the first end of the sensing core with it is described solid
Determine part to be fixedly connected.
Preferably, the fixture is nut, and the first end of the sensing core is connected by screw thread with the nut.
Preferably, the shell is the thin cylinder of one end open.
Preferably, the openend of the shell is in contact by sealing gasket with the second layer of composite construction.
Preferably, the second end of the sensing core is connected by nut with the cylinder bottom of the thin cylinder.
As described above, sensor of the present invention, has the advantages that：The sensor passes through in sensing core table
Face sets foil gauge, can measure sliding and the disengaged condition of large complex structure interlayer simultaneously, and can reflect multi-C stereo
The time of day of composite construction interlayer；Low manufacture cost, it is easily installed, measurement is simple, is easy to apply.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the sectional view of the present invention.
Fig. 3 is I-I sectional view in Fig. 2.
Fig. 4 is the sectional view of shell.
Fig. 5 is II-II sectional view in Fig. 4.
Fig. 6 is the side view of sealing gasket.
Fig. 7 is composite construction interlayer changing of the relative positions schematic diagram.
Fig. 8 is Y-Z plane schematic diagram in Fig. 7.
Fig. 9 is sensing core section enlarged diagram.
Component label instructions
1 sensing core
11 first ends
12 second ends
13 bodies
14 fixing devices
2 shells
3 foil gauges
31 wires
4 sealing gaskets
51 first layers
52 second layers
Embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., only coordinating specification to be taken off
The content shown, so that those skilled in the art understands and reads, the enforceable qualifications of the present invention are not limited to, therefore
Do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size, do not influenceing the present invention
Under the effect of can be generated and the purpose that can reach, it all should still fall and obtain the model that can cover in disclosed technology contents
In enclosing.Meanwhile cited such as " on ", " under ", "left", "right", the term of " centre " in this specification, it is merely convenient to chat
That states understands, and is not used to limit the enforceable scope of the present invention, and its relativeness is altered or modified, and skill is being changed without essence
Held in art, when being also considered as the enforceable category of the present invention.
The present invention provides a kind of sensor for measuring composite construction contact status between layers, as shown in figure 1, the composite construction
Including adjacent first layer 51 and the second layer 52, under the influence of extraneous factor, occur between the first layer 51 and the second layer 52
Disengagement and slip state, the sensor measurement is the disengagement and slip state.As shown in Fig. 2 the sensor includes
Sense the shell 2 of core 1 and one, the shell 2 is located in the first layer 51 of composite construction, the first layer 51 and the second layer of composite construction
When occurring disengaging with slip state between 52, the sensing meeting flexural deformation of core 1, therefore, the side of core 1 and the inwall of shell 2 are sensed
Between should stay it is at regular intervals, it is ensured that sensing core 1 will not touch the inwall of the shell 2 when deforming.
As shown in Figures 1 and 2, the sensing core 1 have be fixedly linked with the second layer 52 of composite construction first end 11,
The second end 12 being fixedly connected with the shell 2 and the body 13 in the shell 2.Preferably, the sensing core 1
Material can use metal.Sense the first end 11 of core 1 and the optional company fixed with the following methods of the second layer 52 of composite construction
Connect, as shown in figure 1, the embedded fixing component 14 in the second layer 52 of the composite construction, fixture 14 can also be pasted or anchored
In the second layer 52, the first end 11 of the sensing core 1 is fixedly connected with the fixture 14, and the fixture 14 can be spiral shell
Mother, the first end 11 of the sensing core 1 are connected by screw thread with the nut, can also use other connected modes to connect the sense
The first end 11 and the fixture 14 of core 1 are answered, is such as welded.As shown in Fig. 2, Fig. 4 and Fig. 5, it is preferable that the shell 2 is one
The thin cylinder of end opening, the second end 12 of the sensing core 1 are connected by nut with the cylinder bottom of the thin cylinder, i.e., and the
Two ends 12 are provided with external screw thread, and nut is located at the outside of shell 2, and the second end 12 of sensing core 1 passes through the cylinder bottom of the thin cylinder,
Then by nut check.As shown in Figure 6, it is preferable that the openend of the shell 2 pass through sealing gasket 4 and composite construction second
Layer 52 is in contact, and the sealing gasket 4 can be elastic sealing gasket, it is ensured that the sealing between sealing gasket 4 and the composite construction second layer 52
Performance.
As shown in figure 1, the surface of the sensing core 1 is provided with multiple foil gauges 3, the foil gauge 3 is close to the first end
11, wire 31 can be provided with foil gauge 3, the wire 31 is drawn from the composite construction, and the wire should be typically located at
The place that will not be interfered with by construction, accurately to measure the strained situation of sensing core 1.As shown in Figure 3, it is preferable that the sensing
The cross section of core 1 is square, has four sides, and correspondingly, shown foil gauge 3 also has four, is respectively adhered on sensing core 1
Four sides, the strain that the foil gauge 3 that four sides are pasted up and down is measured is followed successively by ε1、ε2、ε3、ε4(see Fig. 9), instead
Mirror the strain variation of each side of sensing core 1.In order to ensure the strain error measured is smaller, the length of the sensing core 1
For L, the length of side of cross section is a, and L/a should be greater than 4.
Present invention measurement composite construction interlayer is disengaged below and the measuring principle and application method of slip state are further
Illustrate, the deformation that core 1 is sensed in the present invention is divided into two parts, including transverse curvature and axial deformation.
To express clearly, using sense core 1 end square section center as the origin of coordinates, with the composite construction second layer
52 outer normal direction is Z axis, and one of them is tangentially Y-axis, connecing between Y-axis and the first layer 51 and the second layer 52 of composite construction
Contacting surface overlaps (as shown in Figure 7 and Figure 8), and in Fig. 7, M1 represents the original state of composite construction first layer 51, M2 table composite constructions
First layer 51 disengage and slide after state.X-axis (as shown in Figure 9) is determined according to right-hand rule, wherein thumb points to
For Z-direction.In Z-Y plane, it is assumed that deform just, to be strained along reference axis forward direction using tension as just, axial deformation causes
Strain as ε0；Bending causes the strain of sensing wicking surface to be εIt is curved(εIt is curvedCause strain absolute value for moment of flexure).Therefore, ε1=ε0-εIt is curved,
ε2=ε0+εIt is curved。
Equation below is established according to structural mechanics beam with both ends built-in Deformation Theory：
H/L=ε0 (2)
ε1=ε0-εIt is curved, ε2=ε0+εIt is curved (3)
Solve equation：
The displacement (sliding) of the tangential Y-direction in interlayer contact face：
The displacement (disengagement) of interlayer contact face normal direction Z-direction：
It can similarly calculate：
The displacement (sliding) of the tangential X-direction in interlayer contact face：
In formula, L is sensing core effective length；A is the square-section length of side of sensing core；ε1、ε2、ε3、ε4Respectively sense core
The strain value of 1 four sides up and down；vxThe displacement of contact surface in X direction between composite construction layer under slip state； vy
The displacement of the tangential Y-direction of contact surface between composite construction layer under slip state；H contact surfaces between composite construction layer under disengaged condition
The displacement of normal direction Z-direction.
Specifically used method and step are as follows：
1) the pre-buried fixing device 14 in the second layer 52 of composite construction, then connects sensor and fixing device 14,
Sealing gasket 4 is installed between shell 2 and the second layer 52 of composite construction, and wire 31 is drawn into composite construction and is easy to connection to gather
Instrument.
2) sensor is connected with general strain acquirement instrument, instrument is subjected to rezero operation before testing.
3) strain value of four sides up and down of record sensing core 1 is respectively ε1、ε2、ε3、ε4。
3) by ε1And ε2It is updated to respectively in formula (4) and formula (5), obtains vyAnd h, by ε3And ε4It is brought into formula (6), obtains
vx。
Become apparent from for narration, one embodiment of the present of invention given below
The bending rigidity EI=7.78Nm of sensing core used in the present invention2；L=0.04m；A=0.006m.By answering
The strain that change instrument measures four foil gauges 3 is respectively ε1=-100 μ ε；ε2=500 μ ε；ε3=800 μ ε；ε4=-400 μ ε, will
Above-mentioned data are brought into formula (4), (5) and (6), calculate vy=6.67e-4M, vx=1.33e-3m；H=8e-6m
In summary, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (6)
1. a kind of sensor for measuring composite construction contact status between layers, the composite construction include adjacent first layer (51) and
The second layer (52), it is characterised in that the sensor includes sensing core (1) and a shell (2), and the shell (2) is positioned at compound
In the first layer (51) of structure, the sensing core (1) has the first end that the second layer (52) with composite construction is fixedly linked
(11) the second end (12), being fixedly connected with the shell (2) and the body (13) in the shell (2)；The sense
Ying Xin (1) surface is provided with multiple foil gauges (3), and the foil gauge (3) is close to the first end (11)；The composite construction
Fixture (14), first end (11) and the fixed company of the fixture (14) of the sensing core (1) are embedded with the second layer (52)
Connect；The shell (2) is the thin cylinder of one end open, and the openend of the shell (2) passes through sealing gasket (4) and composite construction
The second layer (52) be in contact.
2. sensor according to claim 1, it is characterised in that：The cross section of the sensing core (1) is square, is had
Four sides, the length of the sensing core (1) is L, and the length of side of cross section is a, and L/a is more than 4.
3. sensor according to claim 2, it is characterised in that：The foil gauge (3) has four, is respectively adhered on sensing
Four sides of core (1).
4. sensor according to claim 1, it is characterised in that：The foil gauge (3) is provided with wire (31), described to lead
Line (31) is drawn from the composite construction.
5. sensor according to claim 1, it is characterised in that：The fixture (14) is nut, the sensing core (1)
First end (11) be connected by screw thread with the nut.
6. sensor according to claim 1, it is characterised in that：The second end (12) of the sensing core (1) passes through nut
It is connected with the cylinder bottom of the thin cylinder.
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| CN106564217A (en) * | 2016-10-26 | 2017-04-19 | 东南大学 | Intelligent sandwich panel |
| CN109708563A (en) * | 2018-12-28 | 2019-05-03 | 重庆交通大学 | Strain-type structure section changing of the relative positions test device |
| CN110501573B (en) * | 2019-09-27 | 2021-09-21 | 上海交通大学 | Method and system for measuring contact state of mounting surface of linear guide rail |
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| FR2650389B1 (en) * | 1989-07-27 | 1993-03-26 | Sextant Avionique | DEVICE FOR MEASURING DEFORMATION OF A MEMBRANE |
| US6810753B2 (en) * | 2000-08-29 | 2004-11-02 | The Cleveland Clinic Foundation | Displacement transducer |
| CN1971212A (en) * | 2006-12-05 | 2007-05-30 | 中国科学院力学研究所 | Strain measuring device for ocean platform |
| CN101560749B (en) * | 2009-05-13 | 2011-01-26 | 长安大学 | Sensor for detecting dynamic response of asphalt pavement |
| CN202734754U (en) * | 2012-07-12 | 2013-02-13 | 俞博 | Sensor for measuring hinged seam shearing deformation |
| CN103115711B (en) * | 2013-01-25 | 2015-01-28 | 中国兵器工业第二0二研究所 | Method for testing braking force of muzzle brake |
| CN203515626U (en) * | 2013-09-26 | 2014-04-02 | 山东科技大学 | Anchor rod used for detecting anchor rod axial force and bending moment |
| CN203551152U (en) * | 2013-10-28 | 2014-04-16 | 北京石油化工学院 | Minitype tension sensor |
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