CN107830950A - A kind of adjusting method of pressure measxurement sensitivity - Google Patents
A kind of adjusting method of pressure measxurement sensitivity Download PDFInfo
- Publication number
- CN107830950A CN107830950A CN201710881476.4A CN201710881476A CN107830950A CN 107830950 A CN107830950 A CN 107830950A CN 201710881476 A CN201710881476 A CN 201710881476A CN 107830950 A CN107830950 A CN 107830950A
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- CN
- China
- Prior art keywords
- sensitivity
- pressure
- conductive filler
- yarn
- polymeric matrix
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
Abstract
The invention discloses a kind of adjusting method of pressure measxurement sensitivity.This method is directed to new distribution type pressure sensor of the fibre reinforced composites as sensitive material, to adjust the sensitive relations between its resistance variations and ambient pressure.First, during fiber weaving machine manufactures fiber-reinforced fabric, the yarn tension that goes out of yarn device is taken by regulation, changes the tightening degree between carbon fiber in fabric；Secondly, it is molded in polymeric matrix in manufacturing process, the conductive particles such as CNT or carbon black is dispersed in polymer fluid in proportion, by adjusting its loading, changes the density of conductive particle in gap between carbon fiber.Based on above-mentioned regulation, this method can effectively change the initial resistivity value and piezoresistive variation relation between carbon fiber, and then change the measurement sensitivity of pressure sensor.The present invention in the case where not changing composite bulk strength substantially, can effectively adjust the sensitivity of its pressure measxurement.
Description
Technical field
The present invention relates to sensor sensitivity adjusting method, is surveyed more particularly, to a kind of pressure of fibre reinforced composites
Measure the adjusting method of sensitivity.
Background technology
In power sensory field, silicon substrate pressure drag material and Metal Substrate foil gauge are always the main flow of commercial Application, but it is non-
By material hard brittle limitation in itself in contact distribution detection application in plane.And fibre reinforced composites exist
Advantage on " structure-function integration " makes it start to develop to sensing detection field.Carbon fibre reinforced composite deforms
The change of internal carbon fibers resistance can be caused, therefore other equipment need not be increased, only can by measuring the resistance value of carbon fiber
Effectively to judge the stressing conditions of composite.Therefore, can utilize the curve surface adaptives of fibre reinforced composites with from quick
Sense characteristic design can on complex-curved long-term stable operation curved surface pressure sensor device.
In actual applications, typically according to the requirement of use occasion, can all design the measuring range of force snesor with it is sensitive
Degree, to optimize the service efficiency of sensor.Sensor based on silicon substrate pressure drag material or Metal Substrate foil gauge can pass through sensitivity
The intensity of structure adjusts range and sensitivity.And fibre reinforced composites have also tended to while as sensitive material
To the effect of structural support.Therefore, although the methods of changing filament number, change polymeric matrix material can change its sensitivity
Property, but also tend to become reduce its intensity, so should not use.
And from the microstructure of fibre reinforced composites, it is found that carbon is fine in the lower composite of external force effect
Resistivity measurements meeting reason of changes between dimension is：External force effect cause material to deform, and then change carbon fibre tow in and
Clearance distance between tow, the resistivity measurements between carbon fiber are finally made to change.
Based on this, in the composite fabrication stage, between the application is by artificially designing in carbon fibre tow between tow
Stand-off distance is from so as to change the measurement sensitivity of pressure sensitive unit, that is, realizing the regulation of piezoresistance sensitivity.
The content of the invention
Drawbacks described above in the presence of being used for fibre reinforced composites as the pressure sensor of sensing element, this
Application provides a kind of method that can adjust its contact measurement sensitivity, can effectively adjust fiber increasing in this way
The pressure detecting sensitivity of strong composite pressure sensor, without producing larger shadow to composite structural strength itself
Ring.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of adjusting method of pressure measxurement sensitivity, for new distribution type of the fibre reinforced composites as sensitive material
Pressure sensor：In the weaving process of fabric, the yarn tension that goes out that yarn device is taken in braider is adjusted, to change
The tensioning degree of carbon fiber in fabric, and then adjust the contact area between two carbon fibers to be intersected at node.When connecing
During contacting surface product increase, the measurement resistance value between two carbon fibers reduces, conversely, then improving.Allocated in polymeric matrix
When, conductive filler is added thereto, conductive filler is dispersed in polymeric matrix, to change the resistance of polymeric matrix
Characteristic, and then influence the sensitiveness of the external power effect of carbon fiber electrically resistance in fibre reinforced composites.
Further, as preferred：
The yarn tension regulating method that goes out for taking yarn device is included：For annular weaving process, regulation is taken on yarn device assembly pulley guide rail
Spring, change the spring of varying strength can change take yarn device go out yarn tension.For three-dimensional woven process, regulation is taken on yarn device
The spring of brake block connection, by tighten up spring can change take yarn device go out yarn tension.Other links also can be to going out due in
Yarn tension impacts, so the yarn device of taking after regulation goes out yarn tension and needs to calibrate by yarn tension measuring instrument, it is ensured that all
The tensioning degree of fiber is consistent.
Include to polymeric matrix addition conductive filler process：Conductive filler is CNT, carbon black or the two is mixed
The ratio of compound, polymeric matrix volume and conductive filler overall volume is 100:1 to 100:Between 15；Conductive filler content is got over
Height, resistance initial value is smaller between carbon fiber in composite, and pressure measxurement sensitiveness is higher.Polymeric matrix is asphalt mixtures modified by epoxy resin
Fat, mixed by two kinds of liquid of host and curing agent, the two ratio prepares requirement by epoxy resin and is defined.Conduction is filled out first
Material is added in epoxy resin host, stirs 10-30 minutes with 500-1000rpm rotating speeds with agitator, ultrasound is placed into after sealing
10-30 minutes are shaken in washer, then add curing agent, then 5-10 minutes are stirred with 500-1000rpm rotating speeds with agitator,
Conductive filler, which is put into after being uniformly dispersed in vacuum tank, to be evacuated to 0.1 atmospheric pressure and is kept for 2 minutes to discharge bubble, is then
It can be molded.
Finally, it is necessary to be fed back to the regulating effect of piezoresistance sensitivity, its content includes：Weaving process goes out yarn tension
It is two adjustable parameters with the conductive filler ratio in polymeric matrix.Prepare the distributed pressure sensing under different parameters combination
Element sample, by pressure test, the corresponding relation of resistance variations between acquisition pressure size and carbon fiber.Pass through above-mentioned correspondence
Relation, it may be determined that how the distributed pressure sensing element of piezoresistance sensitivity, adjustable parameter should adjust needed for producing.
The invention has the advantages that：
The present invention concentrates on the adjustment of sensitivity of composite sensor the preparatory phase of enhancing fabric and polymeric matrix, because
This is simple to operate, and the manufacturing equipment of existing fibre reinforced composites especially need not be transformed, can be substantially not
In the case of changing composite bulk strength, the sensitivity of its pressure measxurement is effectively adjusted.
Brief description of the drawings
Fig. 1 is the interlayer structure figure of fiber-reinforced fabric.
Fig. 2 is to intersect structural representation of the carbon fiber at node based on two in composite.
Fig. 3 be in composite pressure sensor one group of carbon fiber electrically resistance to extraneous pressure-responsive.
In figure：1st, test point, 2, resistance measurement, 3, warp-wise carbon fibre tow, 4, warp-wise Kevlar tow, 5, broadwise carbon it is fine
Tie up tow, 6, broadwise Kevlar tow, 7, current path, 8, warp-wise carbon fibre tow, 9, broadwise carbon fibre tow, 10, carbon receives
Mitron particle.
Embodiment
The present invention is further illustrated with example below in conjunction with the accompanying drawings.
The representative instance of one the inventive method is：It is fine using MULTILAYER COMPOSITE of the three-dimensional woven method manufacture with bundled yarn
Dimensional fabric, as shown in figure 1, fabric intermediate uses the beautiful T700-12K carbon fibers in east as sensitive fibres except part warp thread and weft yarn
Outside, other Xian Wei Zhuo are Kevlar-29.Polymeric matrix uses vinylite RF1001, and conductive filler is received using more wall carbon
Mitron（50 nanometers of external diameter, length 10-20 microns）.
In the fabric fabrication stage, the tension force spring of yarn device is taken in adjustment, makes the yarn of all warp thread and weft yarn
Power is controlled in 80 lis of oxen, and verifies the actual tension per one thread with hand-held yarn tension tester.
The stage is prepared in polymeric matrix, the dosage of each material is：Base resin, curing agent and the mass ratio of accelerator are
100:2:2, resin is overall and the volume ratio of CNT is：100:5.First, base resin is added in a reservoir, adds carbon
Nanotube powder, stirred 20 minutes with 800rpm rotating speeds with mixer；Then, by container closure, it is put into supersonic cleaning machine, after
It is continuous scattered 20 minutes；Next, opening container and adding curing agent and accelerator, stirred again with mixer with 800rpm rotating speeds
5 minutes；Finally, container is put into vacuum drying chamber, is evacuated down to 0.2 atmospheric pressure and is kept for 2 minutes.The liquid that will be prepared
Body, which is put into injection machine, to carry out injection operation to the fabric weaved.
The composite pressure sensor finally given its internal two intersects microstructure of the carbon fiber in node location
As shown in Figure 2（Only show the CNT of crosspoint annex）, under external force, carbon fibre tow inside and carbon fibre tow
Between can be changed using CNT as the gap of bridge, and measure the resistance actually combination comprising two parts：Carbon
Fabric resistor and gas resistance, it is clear that gas resistance is measuring the major part of resistance value, when gap length changes, overall electricity
Significant change can also occur for resistance.
Place the sensors on 3 bullodozers, pressure measxurement is carried out to it, and measure carbon fiber section below pressure position
Resistance variations at point, its result are as shown in Figure 3, it can be seen that resistance change rate is substantially linear with pressure size.
Claims (4)
1. a kind of adjusting method of pressure measxurement sensitivity, it is characterised in that for fibre reinforced composites as sensitive material
The new distribution type pressure sensor of material：
（1）In the weaving process of fabric, the yarn tension that goes out that yarn device is taken in braider is adjusted, to change in fabric
The tensioning degree of carbon fiber, and then adjust the contact area between two carbon fibers to be intersected at node；
（2）When polymeric matrix is allocated, conductive filler is added thereto, conductive filler is dispersed in polymer matrix
In body, to change the resistance characteristic of polymeric matrix, and then carbon fiber electrically resistance is influenceed in fibre reinforced composites to external force
The sensitiveness of effect.
2. the adjusting method of the pressure measxurement sensitivity of fibre reinforced composites according to claim 1, its feature exist
In the described yarn tension regulating method that goes out for taking yarn device includes following content：
（1）For annular weaving process, the spring on yarn device assembly pulley guide rail is taken in regulation, the spring of varying strength is changed, to change
Become take yarn device go out yarn tension；
（2）For three-dimensional woven process, regulation takes the spring that brake block connects on yarn device, tightens up spring, and yarn device is taken to change
Go out yarn tension；
（3）Yarn device of taking after regulation goes out yarn tension and needs to calibrate by yarn tension measuring instrument, to ensure the tensioning of all fibres
Degree is consistent.
3. the adjusting method of the pressure measxurement sensitivity of fibre reinforced composites according to claim 1, its feature exist
In adding conductive filler process to polymeric matrix includes following content：
（1）Conductive filler is CNT, carbon black or the mixture of the two, polymeric matrix volume and conductive filler totality body
Long-pending ratio is 100:1 to 100:Between 15；
（2）Polymeric matrix is epoxy resin, is mixed by two kinds of liquid of host and curing agent, the two ratio is with epoxy resin
Requirement is prepared to be defined；
（3）Conductive filler is added in epoxy resin host first, with agitator with 10-30 points of 500-1000rpm rotating speeds stirring
Clock, concussion 10-30 minutes in ultrasonic cleaning machine are placed into after sealing, then add curing agent, then with agitator with 500-
1000rpm rotating speeds stir 5-10 minutes, and conductive filler, which is put into after being uniformly dispersed in vacuum tank, is evacuated to 0.1-0.3 atmospheric pressure
And kept for 2 minutes discharge bubble, you can be molded.
4. the adjusting method of the pressure measxurement sensitivity of fibre reinforced composites according to claim 1, its feature exist
In, it is necessary to be fed back to the regulating effect of piezoresistance sensitivity, its content includes：
（1）The conductive filler ratio gone out in yarn tension and polymeric matrix of weaving process is two adjustable parameters；
（2）Prepare the lower distributed pressure sensing element sample of different parameters combination, by pressure test, obtain pressure size and
The corresponding relation of resistance variations between carbon fiber；
（3）Pass through above-mentioned corresponding relation, it may be determined that the distributed pressure sensing element of piezoresistance sensitivity needed for producing, it is adjustable
How parameter should adjust.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710881476.4A CN107830950A (en) | 2017-09-26 | 2017-09-26 | A kind of adjusting method of pressure measxurement sensitivity |
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| CN201710881476.4A CN107830950A (en) | 2017-09-26 | 2017-09-26 | A kind of adjusting method of pressure measxurement sensitivity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111586945A (en) * | 2020-05-29 | 2020-08-25 | 福建星宏新材料科技有限公司 | Single-key touch-press dimming switch and switch dimming method |
| CN113178628A (en) * | 2021-04-19 | 2021-07-27 | 河南利威新能源科技有限公司 | Lithium ion battery module and health state monitoring method thereof |
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|---|---|---|---|---|
| US4715235A (en) * | 1985-03-04 | 1987-12-29 | Asahi Kasei Kogyo Kabushiki Kaisha | Deformation sensitive electroconductive knitted or woven fabric and deformation sensitive electroconductive device comprising the same |
| US20090282671A1 (en) * | 2008-05-19 | 2009-11-19 | Xiaoming Tao | Method for manufacturing fabric strain sensors |
| US20160075061A1 (en) * | 2014-09-15 | 2016-03-17 | The Regents Of The University Of Michigan | Methods to increase structural performance, strength and durability of fabric-reinforced composite materials by pre-stressing |
| US20160186366A1 (en) * | 2013-08-16 | 2016-06-30 | Footfalls And Heartbeats Limited | Method for making electrically conductive textiles and textile sensor |
| JP2016213277A (en) * | 2015-04-30 | 2016-12-15 | 帝人株式会社 | Cloth-like transducer and device including the same |
-
2017
- 2017-09-26 CN CN201710881476.4A patent/CN107830950A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715235A (en) * | 1985-03-04 | 1987-12-29 | Asahi Kasei Kogyo Kabushiki Kaisha | Deformation sensitive electroconductive knitted or woven fabric and deformation sensitive electroconductive device comprising the same |
| US20090282671A1 (en) * | 2008-05-19 | 2009-11-19 | Xiaoming Tao | Method for manufacturing fabric strain sensors |
| US20160186366A1 (en) * | 2013-08-16 | 2016-06-30 | Footfalls And Heartbeats Limited | Method for making electrically conductive textiles and textile sensor |
| US20160075061A1 (en) * | 2014-09-15 | 2016-03-17 | The Regents Of The University Of Michigan | Methods to increase structural performance, strength and durability of fabric-reinforced composite materials by pre-stressing |
| JP2016213277A (en) * | 2015-04-30 | 2016-12-15 | 帝人株式会社 | Cloth-like transducer and device including the same |
Non-Patent Citations (1)
| Title |
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| 廖丽芳 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111586945A (en) * | 2020-05-29 | 2020-08-25 | 福建星宏新材料科技有限公司 | Single-key touch-press dimming switch and switch dimming method |
| CN113178628A (en) * | 2021-04-19 | 2021-07-27 | 河南利威新能源科技有限公司 | Lithium ion battery module and health state monitoring method thereof |
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