CN105157889B - A kind of sensor based on carbon fibre composite - Google Patents
A kind of sensor based on carbon fibre composite Download PDFInfo
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- CN105157889B CN105157889B CN201510579657.2A CN201510579657A CN105157889B CN 105157889 B CN105157889 B CN 105157889B CN 201510579657 A CN201510579657 A CN 201510579657A CN 105157889 B CN105157889 B CN 105157889B
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- steel disc
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Abstract
The invention provides the sensor based on carbon fibre composite, includes tension and compression transformational structure i.e. 4 piece exterior chord, and its mutual hinge connections forms geometrically unstable system；CFRP bar clamp structures, i.e., upper and lower two layers of clamping steel disc, by way of trip bolt, clamp CFRP bars；And give three kinds of (point type, line style, face type) forms in concrete engineering application.The processing technology of the present invention is relatively easy, and cost is relatively low, solves the problems, such as that CFRP can not be pressurized as sensing element, and peace loading, unloading CFRP bars are more convenient, reproducible.For various sizes of CFRP bars, it is only necessary to produce the fixture of prefabricated matching.It in addition, autgmentability of the present invention is preferable, can individually arrange, can also form array arrangement.
Description
Technical field
The pressure sensor used in present invention design civil engineering, especially a kind of biography based on carbon fibre composite
Sensor.
Background technology
Carbon fiber has higher tensile strength as a kind of flexible tensile material, can be widely applied to structure by
Draw position, such as drag-line, hogging moment area reinforcing etc..Rigid carbon-fiber composite (Carbon Fiber Reinforced
Plastic, abbreviation CFRP) it is the material with certain rigidity being combined by flexible carbon fiber wire and resin matrix.At present,
CFRP mechanical resistance characteristic (0 resistance variation characteristic of strain) is increasingly becoming study hotspot, and the sensor based on CFRP mechanical resistance characteristics is set
Meter also turns into a kind of new challenge.
According to the law of resistance：R=ρ L/A, wherein ρ are test specimen resistivity, and L is piece lengths, and A is test specimen cross-sectional area.When
Keep electricalresistivityρ constant, resistance value increase can be caused by increasing length L or reducing sectional area A.Therefore, carbon fibre material is deposited
Become big characteristic by pull-up resistor, and there is also the electricity of strain 0 by the CFRP composites that carbon fiber and matrix further synthesize
Hinder variation characteristic.
The CFRP rigid materials made on the basis of different technique, process and matrix formulation, have different mechanical resistances special
Property.Sensor using CFRP as sensing meta design, and be applied to field of civil engineering, then it is a new sensor research
Focus, at the same time, sensor also faces the problem of many and difficulty as exploitation.Currently, sensed for resistance strain gage
For device, it both can apply to tension test, and and can, which is applied to be pressurized, tests.However, for CFRP, it is as sensing element
When being tested applied to tension, resistance strain gage sensor is may be referred to, then has following two during test but it is applied to be pressurized
Individual subject matter：
(1) as shown in Fig. 1 (a), although CFRP is rigid material, can be pressurized in theory, general CFRP length is thin
Than too big (length is much larger than diameter), therefore when being pressurized, is easily damaged because there is Order Moment, cause its pressure-bearing model
Enclose smaller；
(2) as shown in Fig. 1 (b), CFRP is when being pressurized, although CFRP is integrally rigid, its internal carbon fiber
Flexibility is remained as, therefore when its compression produces compressive deformation, internal carbon fiber can not cooperative transformation.
The content of the invention
The invention provides a kind of tensile properties that can utilize CFRP, the strain (stress) of geodesic structure nip is treated in measurement
Sensor based on carbon fibre composite, so as to provide technical support for the extensive use of the sensor based on CFRP.
A kind of sensor based on carbon fibre composite, it is characterised in that including tension and compression transformational structure, more carbon fibers
Rod, clamping device, the tension and compression transformational structure include at least 4 rigid exterior chords, and the exterior chord intersects arrangement, two
The overlapping part of exterior chord is hinged, and forms the variable quadrangle of at least one shape, described four are formed in the exterior chord
The part of side shape frame is double-decker, and the double-decker includes upper strata exterior chord, lower floor's exterior chord, upper strata exterior chord with
Gap is left between lower floor's exterior chord, at least one through hole and upper strata are provided with the upper strata exterior chord, lower floor's exterior chord
Exterior chord, the axle center of through hole in lower floor's exterior chord are on same straight line；
The both ends end of at least one carbon fiber rod, which is extended between upper strata exterior chord and lower floor's exterior chord, leaves gap, simultaneously
It is fixed on by clamping device in the through hole；More carbon fiber rods head and the tail in one quadrangle electrically connect composition series connection
Circuit；
The clamping device includes upper strata clamping steel disc, lower floor clamps steel disc, fastening bolt, the upper strata clamping steel disc,
Lower floor's clamping steel disc is the middle rectangle steel disc with rectangular recess, and the rectangular recess back side is provided with jointed shaft, described
The both sides of rectangular recess are provided with screw hole；
The upper strata clamping steel disc, lower floor's clamping steel disc are oppositely arranged, are articulated with by the jointed shaft outside the upper strata
Chord member, lower floor's exterior chord through hole in, the end of the carbon fiber rod is located at upper strata clamping steel disc, lower floor clamping steel disc
In rectangular recess, the upper strata clamping steel disc, lower floor's clamping steel disc are fixed by fastening bolt.
Preferably, the recessed width between the upper strata clamping steel disc and lower floor's clamping steel disc have to be larger than upper strata clamping steel
The width of piece and lower floor's clamping steel disc
Preferably, the four edges equal length of the variable quadrangle of the shape.
Preferably, the clamping face of the upper strata clamping steel disc and lower floor's clamping steel disc should do grinding process.
Preferably, outside the hinged place between the exterior chord, upper strata clamping steel disc, the jointed shaft of lower floor's clamping steel disc and upper strata
Chord member, lower floor's exterior chord through hole hinged place apply lubricant.
Preferably, the exterior chord forms the variable quadrangle of multiple shapes, and it is straight that the multiple quadrangle is located at same
On line.
Preferably, the exterior chord forms the variable quadrangle of multiple shapes, and the multiple quadrangle forms a plane.
Present invention simulation truss work principle, realize to draw generation pressure.In truss structure, rod member only exists pressure and pulling force,
If applying pressure to wherein a certain rod piece A, rod piece A produces compressive strain, and this compressive strain effect passes through the transmission of truss, reach with
After the different another rod member B of location A, what may be formed in rod member B is tension.Here it is with the thought of drawing generation pressure.
The subject matter that the sensor solves is will to treat that the pressure (compressive strain) of geodesic structure is converted to CFRP pulling force (drawing
Strain).When structural region to be measured forms local compressive strain, the tension and compression converting system designed by the present invention can perceive knot to be measured
The local microstrain of structure, and by the transformation mechanism in system, it is perceived that the compressive strain perceived is converted into CFRP
Stretching strain (i.e. CFRP tensions), so as to which the compressive strain for treating geodesic structure to be converted to CFRP stretching strain, by the electricity for measuring CFRP
Resistive, the anti-compressive strain (compression) for releasing structure partial to be measured, complete the sensor measurement pressure using CFRP as sensing element
The overall process in area.
Beneficial effects of the present invention：
Sensor of the present invention based on carbon fibre composite, based on CFRP drag characteristics, CFRP can be directed to
The shortcomings that bar can not be pressurized, and use and CFRP bars are applied to sensor as sensing element in a manner of drawing generation to press.This hair
Bright processing technology is relatively easy, and cost is relatively low, and peace loading, unloading CFRP bars are more convenient, reproducible.For not
With the CFRP bars of size, it is only necessary to produce the fixture of prefabricated matching.In addition, autgmentability of the present invention is preferable, can be independent
Arrangement, it can also form array arrangement.
Brief description of the drawings
Fig. 1 (a) is two parasitic moment problem schematic diagrames；Fig. 1 (b) is cooperative transformation problem schematic diagram.
Fig. 2 is the Fundamentals of Sensors figure.
Fig. 3 is that mathematical principle figure is changed in tension and compression.
Fig. 4 is the mathematical relationship schematic diagram calculation that tension and compression are changed when being arranged vertically CFRP.
Fig. 5 is the structure chart of the tension and compression transformational structure.
Fig. 6 is CFRP clamping steel disc sectional drawing.
Fig. 7 is that CFRP clamps steel disc installation steps figure.
Fig. 8 is the structure chart of sensor of the present invention.
Fig. 9 (a) is concrete application nip schematic diagram；Fig. 9 (b) is that concrete application draws area's schematic diagram.
Figure 10 (a) sensors are that line style arranges schematic diagram；Figure 10 (b) is line style arrangement measurement figure.
Figure 11 is applied to plank frame schematic diagram.
Figure 12 is sensor array measurement figure.
Description of reference numerals is as follows：
1- exterior chords, 101- upper stratas exterior chord, 102- lower floors exterior chord, 2- through holes, 3- carbon fiber rods, 4- jointed shafts, 5-
Upper strata clamps steel disc, 6- lower floors clamping steel disc, 7- fastening bolts, 8- nuts, 9- wires.
Embodiment
For clearer explanation technical scheme, the embodiment of the present invention is done below in conjunction with the accompanying drawings
Further instruction.
Present invention simulation truss work principle, realize to draw generation pressure.As shown in figure 3, mathematical derivation is provided now
Example, according to Pythagorean theorem, there are following two equations respectively before and after deformation：
c2=a2+b2
c2=(b- δ)2+(a+μ)2
c：The length of the hypotenuse；a,b：Right angle edge lengths；
δ：X-direction shortens length；μ：Y-direction extended length
When keeping, hypotenuse c length is constant, shortens right-angle side b length, then inevitably enlarges other right-angle side a length
Degree.Accordingly, if the right angle b sides of shortening are analogous to nip length to be measured, the right-angle side a of elongation is analogous to carbon fiber rod
3, when the b representated by nip length to be measured shortens, a right-angle sides representated by carbon fiber rod 3 necessarily extend, that is, complete from pressure
Strain the conversion of stretching strain.
In the relation of derivation, consider hypotenuse as rigid body, i.e., do not consider its deformation, examined using two right-angle sides as elastomer
Consider one side compressive deformation, one side tensile deformation.
When being now discussed with specific implementation, the mathematical relationship of drawing-compressive strain relation：
As shown in figure 4, the edge lengths of quadrangle ABCD tetra- keep constant, carbon fiber rod 3 is arranged in figure at MN (MN ⊥
AC), it is assumed that AC is shortens direction, and BD is prolonging direction, then MN lengthening variable process is as follows：
By geometrical relationship：
A=c sin α b=c cos α
(b-δ)2+(a+μ)2=a2+b2
By the cosine law：
Therefore, MN stretching strains are：
Embodiment one：
Using said structure as prototype, the sensor with rigid carbon-fiber rod 3 for sensing element of design, as shown in figure 5, with firm
Property the mutual hinge connections of exterior chord made of metal material form the variable quadrangle of shape, be tension and compression transformational structure.It is described outer
The part that the quadrangle frame is formed on chord member is double-decker, and the double-decker includes upper strata exterior chord 101, outside lower floor
Chord member 102, gap, the upper strata exterior chord 101, lower floor's exterior chord are left between upper strata exterior chord 101 and lower floor's exterior chord 102
The axle center of at least one through hole 2 and the through hole 2 in upper strata exterior chord 101, lower floor's exterior chord 102 is provided with 102 same
On bar straight line, the through hole 2 is used to be hinged carbon fiber rod 3.The both ends end of at least one carbon fiber rod 3 extends to upper strata exterior string
Gap is left between bar 101 and lower floor's exterior chord 102 and is fixed on by clamping device in the through hole 2；One four side
The more head and the tail of carbon fiber rod 3 in shape electrically connect composition series circuit by wire 9.
First, the tension and compression transformational structure is the geometrically unstable system that its form or position can change under external force,
When rigid carbon-fiber rod 3 is arranged in tension and compression transformational structure parallel to Y direction, the deformation of tension and compression transformational structure can be constrained.
Carbon fiber rod 3 is joined end to end, after forming series circuit, applies the reverse equivalent pressure of X-direction at tension and compression transformational structure both ends
Power Fc, structure occur micro- deformation and pass to carbon fiber rod 3, and so as to which stretching strain occurs for carbon fiber rod 3, its resistance value can change,
All-in resistance variable quantity is each resistance change sum of individual carbon fibers rod 3, may finally be in anti-pushing-out structure X-direction it is micro- should
Become.
Presently describe specific mounting means of the carbon fiber rod 3 in test structure：
Fastened by fastening bolt 7, clamp steel disc 5 with upper strata, the rectangular recess of lower floor's clamping steel disc 6 grips carbon fiber
Rod 3, upper strata clamping steel disc 5, lower floor clamping steel disc 6 be hinged on by jointed shaft 4 in exterior chord, ensure that when the sensor by
To the pressure Fc of X-direction, and when deforming upon, to compression, Y-direction elongation, clamped rigid carbon-fiber rod 3 Y-direction only occurs for X
Elongation strain, and its strain is only from stretching action and without moment of flexure effect.
Section is clamped as shown in fig. 6, the clamping device includes upper strata clamping steel disc 5, lower floor's clamping steel disc 6, fastening spiral shell
Bolt 7, upper strata clamping steel disc 5, lower floor's clamping steel disc 6 are the middle rectangle steel disc with rectangular recess, the rectangle
The groove back side is provided with jointed shaft 4, and the both sides of the rectangular recess are provided with screw hole.The upper strata clamping steel disc 5, lower floor's clamping
Steel disc 6 is oppositely arranged, is articulated with by the jointed shaft 4 in the through hole 2 of the upper strata exterior chord 101, lower floor's exterior chord 102,
The end of the carbon fiber rod 3 is located in the rectangular recess of upper strata clamping steel disc 5, lower floor's clamping steel disc 6, the upper strata folder
Hold steel disc 5, lower floor's clamping steel disc 6 is fixed by fastening bolt 7.
Specific installation steps are as follows：
Fig. 7 is specific installation process, for convenience of illustrating, not actually exists section, is described using the imaginary section of exterior chord
Installation process.
Fig. 7 (a)：It is double-decker by the part that rigid exterior chord forms the quadrangle frame, the double-decker bag
Include upper strata exterior chord 101, lower floor's exterior chord 102, leave gap between upper strata exterior chord 101 and lower floor's exterior chord 102, it is described on
At least one through hole 2 and upper strata exterior chord 101, lower floor's exterior chord are provided with layer exterior chord 101, lower floor's exterior chord 102
The axle center of through hole 2 on 102 is on same straight line.
Fig. 7 (b)：Upper strata clamping steel disc 5, lower floor's clamping steel disc 6 are the middle rectangle steel disc with rectangular recess, institute
State the rectangular recess back side and be provided with jointed shaft 4, the both sides of the rectangular recess are provided with screw hole.Rectangular recess is used for carbon fiber
Rod 3 reserves penetration space, and jointed shaft 4 is used to be hinged in the through hole 2 of exterior chord.
Fig. 7 (c)：By lower floor's clamping steel disc 6 perpendicular to exterior chord, stretch into upper strata exterior chord 101, lower floor's exterior chord 102 it
Between gap, until the jointed shaft 4 of lower floor's clamping steel disc 6 is directed at the through hole 2 in lower floor exterior chord 102.
Fig. 7 (d)：The through hole 2 that the jointed shaft 4 of lower floor's clamping steel disc 6 is inserted in lower floor's exterior chord 102.
Fig. 7 (e)：Lower floor's clamping steel disc 6 is rotated by 90 ° around jointed shaft 4 so that lower floor clamps the long axis direction of steel disc 6
It is in the same direction with exterior chord.
Fig. 7 (f)：By upper strata clamping steel disc 5 also by lower floor clamp steel disc 6 in the way of, stretch into upper strata exterior chord 101, under
Gap between layer exterior chord 102, until the jointed shaft 4 of upper strata clamping steel disc 5 is also directed at the through hole 2 in upper strata exterior chord 101,
Design requirement herein meets as follows：Upper strata clamps steel disc 5 and the minor axis length of lower floor's clamping steel disc 6 is less than what is reserved among it
Rectangular apertures width.
Fig. 7 (g)：The jointed shaft 4 of upper strata clamping steel disc 5 is inserted to the through hole 2 of upper strata exterior chord 101.
Fig. 7 (h)：Continue lower floor's clamping steel disc 6 being rotated by 90 ° around jointed shaft 4 so that lower floor clamps the major axis of steel disc 6
Direction is vertical with exterior chord 1 so that upper strata clamps steel disc 5 and lower floor's clamping steel disc 6 is aligned.
Fig. 7 (i)：Steel disc 5 is clamped on upper strata and lower floor's clamping steel disc 6 is directed at screw hole, uses fastening bolt 7 and nut 8
Fastening.
Fig. 7 (j)：Clamped carbon fiber rod 3 is stretched into the recessed rectangular opening for clamping steel disc 401 and 402 and reserving, adjusted
Position, the nut 8 of fastening bolt 7 is backed out respectively, so as to realize the fixation of carbon fiber rod 3, complete this installation.
Carbon fiber rod 3 is installed according to above-mentioned installing engineering, it is as shown in Figure 8 to form the sensor.
In practical engineering application, mode as shown in Figure 9 arranges this sensor：
By this sensor arrangement when when the pressurized zone of geodesic structure, as shown in Fig. 9 (a), by fixed 2 points of A, C, hang
Empty 2 points of B, D carrys out install sensor.When nip produces compressive strain, compressive strain occurs between AC, so as to cooperate be hinged carbon
Stretching strain occurs for fiber rod 3, according to the resistance change sum of whole carbon fiber rods 3, you can anti-to release the corresponding nips of 2 points of AC
The compressive strain of length member.Accordingly, for tensile zone, as shown in Fig. 9 (b), by 90 ° of arrangements of sensor rotation, i.e., AC is vertical
When tension direction is arranged, the structure can also measure stretching strain.
Embodiment two
The sensor arrangement is more flexible, single can both arrange, also can form line by more sub- sensor combinations
Shape sensor array.As shown in Figure 10 (a), using at least 5 exterior chords 1, intersect arrangement, and two exterior chords 1 are equitant
Part is be hinged, forms the variable quadrangle of at least two shapes, due to the frame common sparing of at least two quadrangle outside
Chord member 1, the conversion of its shape is collaboration, available for the approximate continuous measurement in the structures such as beam column.In use, by line
Shape sensor is continuously arranged in the structures such as beam column, measures its corresponding strain value, because the sub- size sensor is with respect to beam
It is smaller for the structures such as post, therefore by these discrete measure data fittings, you can obtain the structures such as whole beam column and passed along linear
The approximate strain curve of sensor bearing of trend, as shown in Figure 10 (b).
Embodiment three
As shown in figure 11, using at least 6 exterior chords 1, intersect arrangement, two 1 equitant part of exterior chord hinges
Connect, form the variable quadrangle of at least three shapes, form face type sensor array due to the frame of at least three quadrangle
Common sparing exterior chord 1, the conversion of its shape is collaboration, is measured available for plank frame, as shown in figure 11.This implementation
The variable quadrangle of nine shapes is provided with example, be i.e. 9 sub- sensors 4, forms the 3*3 array of sensor 4, is sensed per height
The measured value of device 4 be the subregion in mean strain, due to subregion for whole plank frame it is smaller, can be considered as
Point.Therefore, it can be write as the strain matrix of plank frame for the sensor array of face type, its measured value：Δ (i, j, k), wherein i
X directions position is represented, j represents y directions position, and k represents the strain value of the point.The space matrix approximate fits, can be further
Space curved surface is depicted as, as shown in figure 12, more can intuitively show the strained situation of each point.
The embodiment is preferred embodiment of the invention, but the present invention is not limited to above-mentioned embodiment, not
Away from the present invention substantive content in the case of, those skilled in the art can make it is any it is conspicuously improved, replace
Or modification belongs to protection scope of the present invention.
Claims (7)
1. a kind of sensor based on carbon fibre composite, it is characterised in that including tension and compression transformational structure, more carbon fiber rods
(3), clamping device, the tension and compression transformational structure include at least 4 rigid exterior chords (1), and the exterior chord (1) intersects cloth
Put, two overlapping parts of exterior chord (1) are hinged, and form the variable quadrangle of at least one shape, the exterior chord (1)
The upper part for forming the quadrangle frame is double-decker, and the double-decker includes upper strata exterior chord (101), lower floor's exterior string
Bar (102), gap, the upper strata exterior chord (101), lower floor are left between upper strata exterior chord (101) and lower floor's exterior chord (102)
It is provided with exterior chord (102) logical at least one through hole (2) and upper strata exterior chord (101), lower floor's exterior chord (102)
The axle center in hole (2) is on same straight line；
The both ends end of at least one carbon fiber rod (3) extends between upper strata exterior chord (101) and lower floor's exterior chord (102) and stayed
There is gap and be fixed on by clamping device in the through hole (2)；More carbon fiber rods (3) in one quadrangle are first
Tail electrically connects composition series circuit by wire (9)；
The clamping device includes upper strata clamping steel disc (5), lower floor's clamping steel disc (6), fastening bolt (7), the upper strata clamping
Steel disc (5), lower floor's clamping steel disc (6) are the middle rectangle steel disc with rectangular recess, and the rectangular recess back side is provided with
Jointed shaft (4), the both sides of the rectangular recess are provided with bolt hole；
The upper strata clamping steel disc (5), lower floor's clamping steel disc (6) are oppositely arranged, are articulated with by the jointed shaft (4) on described
Layer exterior chord (101), lower floor's exterior chord (102) through hole (2) in, the end of the carbon fiber rod (3) be located at the upper strata and pressed from both sides
In the rectangular recess for holding steel disc (5), lower floor's clamping steel disc (6), the upper strata clamping steel disc (5), lower floor's clamping steel disc (6) are by tight
Fixing bolt (7) is fixed.
2. the sensor according to claim 1 based on carbon fibre composite, it is characterised in that the upper strata clamps steel
Recessed width between piece (5) and lower floor's clamping steel disc (6) have to be larger than upper strata clamping steel disc (5) and lower floor's clamping steel disc (6)
Width.
3. the sensor according to claim 1 based on carbon fibre composite, it is characterised in that the shape is variable
The four edges equal length of quadrangle.
4. the sensor according to claim 1 based on carbon fibre composite, it is characterised in that the upper strata clamps steel
The clamping face of piece (5) and lower floor's clamping steel disc (6) should do grinding process.
5. the sensor according to claim 1 based on carbon fibre composite, it is characterised in that the exterior chord (1)
Between hinged place, upper strata clamping steel disc (5), jointed shaft (4) and the upper strata exterior chord (101) of lower floor's clamping steel disc (6), outside lower floor
The hinged place of the through hole (2) of chord member (102) applies lubricant.
6. according to the sensor based on carbon fibre composite described in claim any one of 1-5, it is characterised in that described outer
Chord member (1) forms the variable quadrangle of multiple shapes, and the multiple quadrangle is located on the same line.
7. according to the sensor based on carbon fibre composite described in claim any one of 1-5, it is characterised in that described outer
Chord member (1) forms the variable quadrangle of multiple shapes, and the multiple quadrangle forms a plane.
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| CN201510579657.2A CN105157889B (en) | 2015-09-11 | 2015-09-11 | A kind of sensor based on carbon fibre composite |
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| US10401239B2 (en) * | 2016-11-01 | 2019-09-03 | The Boeing Company | Integrated hyper-redundant tactile sensor network based on structural fibers |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492221A (en) * | 2003-08-22 | 2004-04-28 | 武汉理工大学 | Self diagnostic intellgient structure of fiber reinforced resin base composite material and method for self diagnosis |
| CN202141546U (en) * | 2010-03-23 | 2012-02-08 | 北京派科森科技有限公司 | High pressure sensor having fiber Bragg grating based on carbon fiber lamination composite material |
| CN102797185A (en) * | 2012-07-10 | 2012-11-28 | 东南大学 | Intelligent FRP (Fiber Reinforced Polymer) composite rib based on carbon fiber distribution type sensing and large-scale production process thereof |
| CN104838512A (en) * | 2012-10-12 | 2015-08-12 | 帝人株式会社 | Piezoelectric element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ITPV20030001A1 (en) * | 2003-01-31 | 2004-08-01 | Ferdinando Auricchio | SENSOR EQUIPPED WITH CARRIER CAPACITIES FOR STRUCTURAL MONITORING WITH REMOTE READING WITHOUT DIRECT CONNECTION. |
| US8191433B2 (en) * | 2008-05-19 | 2012-06-05 | The Hong Kong Polytechnic University | Method for manufacturing fabric strain sensors |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492221A (en) * | 2003-08-22 | 2004-04-28 | 武汉理工大学 | Self diagnostic intellgient structure of fiber reinforced resin base composite material and method for self diagnosis |
| CN202141546U (en) * | 2010-03-23 | 2012-02-08 | 北京派科森科技有限公司 | High pressure sensor having fiber Bragg grating based on carbon fiber lamination composite material |
| CN102797185A (en) * | 2012-07-10 | 2012-11-28 | 东南大学 | Intelligent FRP (Fiber Reinforced Polymer) composite rib based on carbon fiber distribution type sensing and large-scale production process thereof |
| CN104838512A (en) * | 2012-10-12 | 2015-08-12 | 帝人株式会社 | Piezoelectric element |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171117 Termination date: 20180911 |