CN1773296A - Quasi-isopressing method for researching pressure resistance behaviour and apparatus thereof - Google Patents
Quasi-isopressing method for researching pressure resistance behaviour and apparatus thereof Download PDFInfo
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- CN1773296A CN1773296A CN 200510061499 CN200510061499A CN1773296A CN 1773296 A CN1773296 A CN 1773296A CN 200510061499 CN200510061499 CN 200510061499 CN 200510061499 A CN200510061499 A CN 200510061499A CN 1773296 A CN1773296 A CN 1773296A
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Abstract
The present invention discloses a quasi-isostatic pressing method for researching piezo resistance behavior and its equipment. The method adopted by said invention is characterized by applying uniaxial pressure to test sample, limiting transverse deformation of test sample and testing resistance change of test sample with uniaxial pressure. The equipment for implementing said method includes pipe component, on the inner wall of said pipe component an insulating layer is set, in the pipe component an upper ejector pin, a lower ejector pin and two electrodes which are respectively used for contacting with two end faces of the test sample are set, and the lead wires of electrodes are connected with digital universal instrument.
Description
Technical field
The present invention relates to study the pseudo isostatic pressing method and the device thereof of pressure drag behavior, especially study polymer base conductive composite material at the pseudo isostatic pressing method and the device thereof that apply the pressure drag behavior under the uniaxial tension.
Background technology
Conducing composite material is that means are packed into insulating body with conductive filler obtains by blend, doping, original position be compound etc.Because matrix is different to the reaction of outside stimulus with filler, conducing composite material often can be made response to the existence of many outfields (as mechanical external force, solvent, electric field, magnetic field or ultrasonic field), and these responses comprise reduction or rising, changes in resistance, mechanical damping and the acoustic damping etc. of temperature.Particularly with the polymer base conductive composite material of polymeric material as matrix, not only possess unique electricity and mechanical property, have also that quality is little, cost is low, easily processing and characteristics such as corrosion-resistant, its important academic values and engineering background thereby be subjected to extensive concern.
When the resistivity of compound substance changed along with the deformation of external force generation, we claimed this material to have piezoresistive effect.Resistivity of material increases with external pressure and is called as the thrust coefficient effect, increases with external pressure and reduces to be called the negative pressure coefficient effect.The material that possesses the pressure drag characteristic can be used for developing various pressure transducers (strain transducer) and pressure-active element, can also be used for the white monitoring of structured material internal injury.At present, this series products has obtained widespread use in the various occasions such as pressure transducer that the movement load sensor of architectural shock sensor such as the volume change of all kinds of touch gauge tap, motor control part, bridge, highway and aircraft, auto parts, mechanical arm, artificial artificial limb etc. are located, and is used to monitoring and diagnosis continuous fiber filled composite materials internal fiber destroys situation and estimates the fibre breakage mark.
Study the pressure drag behavior theoretically and have special meaning for disclosing seepage flow network structure and character.Pressure drag behavior and conducing composite material after the match electrical conductive behavior outside other is associated, even interrelate with natural all kinds of seepage flow behaviors, be expected to verify the seepage flow behavior and comprise the general action mechanism that causes the seepage flow behavior of pressing, and further disclose the structure-performance relation relevant with conducting process.On the other hand, just because of polymer base conductive composite material may all show responsive response to the existence in many outfields, so when we try hard to utilize a certain sensitive features, must make great efforts to make other outfield that the influence of resistance variations is reduced to minimum, this also requires us to the deep research of making comparisons of the pressure dependence of composite material resistance.
To the mechanical external force that the composite material resistance rate exerts an influence, situations such as may comprising stretching, compress, shear and rock.For compression, exist equally uniaxial compression, three axial compressions contract, etc. different modes such as static compression.What usually material was subjected in use is uniaxial compression without any boundary condition, its pressure drag behavior shows as negative pressure coefficient effect and the big pressure thrust coefficient effect down under the less pressure, shows that the seepage flow network of system obvious destruction occurring under the stress (strain) greatly.Design a kind of uniaxial compression mode that border (being the limit lateral distortion) arranged, can really disclose the mechanism of single shaft pressure drag behavior and therefore develop the more stable goods such as sensor of performance.
Summary of the invention
The purpose of this invention is to provide a kind of pseudo isostatic pressing method and device thereof of studying the pressure drag behavior, be used to investigate uniaxial tension that the border is arranged or deformation influence polymer base conductive composite material resistivity.
The pseudo isostatic pressing method of research pressure drag of the present invention behavior, be to adopt sample is applied uniaxial tension, the transversely deforming of restriction sample can only occur on the one dimension direction sample deformation, arrange electrode on the sample, the resistance of test sample is with the situation of change of uniaxial tension.
Realize the quasi-iso static pressing device of the inventive method, mainly comprise pipe fitting, be provided with insulation course at the inwall of pipe fitting, be equipped with upper ejector pin, lower push rod and two in the pipe fitting and be respectively applied for and sample both ends of the surface electrodes in contact, electrode outlet line links to each other with digital multimeter.
Beneficial effect of the present invention is:
Different implementations according to uniaxial tension or deformation, the present invention can investigate the variation of material resistance under single load, CYCLIC LOADING, creep and the stress relaxation condition, thereby the behavior of circulation pressure drag, resistance creep behaviour, the pressure of studying polymer base conductive composite material cause seepage flow behavior and pressure size and the compression rate influence to pressure drag behavior and seepage flow behavior.Because the distortion of sample is controlled on the one dimension direction fully, the transversely deforming in the non-boundary uniaxial compression and the interference of boundary condition have been avoided, other form of expression in conjunction with the pressure drag behavior, the present invention can disclose seepage flow network microstructure change and single shaft pressure drag behavior mechanism under the pressure better, and then the more stable goods such as sensor of exploitation performance.
Description of drawings
Fig. 1 is a quasi-iso static pressing device synoptic diagram of the present invention;
Fig. 2 is the pressure drag behavior of carbon black filled conductive silicon rubber under non-boundary uniaxial compression condition;
Fig. 3 is that carbon black filled conductive silicon rubber is in the pressure drag behavior that has under the uniaxial compression condition of border;
Fig. 4 is that carbon black filled Conductive Composites is at the resistance creep behaviour that has under the contractive condition of border;
Fig. 5 is that carbon black filled Conductive Composites is in the lax behavior of resistance that has under the contractive condition of border.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing and example.
With reference to Fig. 1, the quasi-iso static pressing device comprises that mainly pipe fitting 4, upper ejector pin 1, lower push rod 7 and two are respectively applied for and sample both ends of the surface electrodes in contact 9, upper ejector pin 1, lower push rod 7 and two plate electrodes 9 place pipe fitting 4, inwall at pipe fitting 4 is provided with insulation course 6, electrode 9 utilizes resistance measurement lead 3 to draw, and links to each other with digital multimeter 11 through upper and lower push rod.Here, pipe fitting 4 is a weldless steel tube, and upper and lower push rod adopts stainless steel material.In the illustrated example, establish nut 2 on the upper ejector pin 1, lower push rod 7 is made of one with bearing 8, so that fixing with material universal testing machine 10.
Cylindrical sample 5 is carried out precompression handle the stress eliminating history.Sample 5 is placed between the upper and lower push rod of quasi-iso static pressing device then, transversely deforming by pipe fitting 4 restriction samples, apply uniaxial tension or deformation with material universal testing machine 10, synchronous recording resistance-pressure-displacement data, as required by the different force mechanism of program design, thus pressure drag behavior and influence factor thereof under the research different situations.
Embodiment 1: investigate the pressure drag behavior that has under the uniaxial compression condition of border.
Carry out following operation respectively: exert pressure near the yield stress of sample by certain loading speed, observe of the influence of big load to sample resistivity; In medium and little stress amplitude scope, sample is carried out CYCLIC LOADING, adjust loading and rate of debarkation and intercycle time, investigate the behavior of circulation pressure drag and the stability thereof of material; Control of employing power respectively or displacement control model load sample and change loading speed, investigate the influence of different loading speeds to the pressure drag behavior.
Fig. 2,3 has compared carbon black filled conductive silicon rubber (the packing quality mark is 25%) in non-boundary and the pressure drag behavior that has under the uniaxial compression condition of border.Solid line among Fig. 2,3 is represented resistance variations, and dotted line is represented the stressed size of sample.Comparison diagram 2 and Fig. 3 can see, compare the situation of non-boundary compression, have the resistance increase of border compression starting stage obviously weakened, and resistance almost is that dullness reduces along with pressure increases.This shows that the resistance under the non-boundary compression situation increases earlier and afterwards reduces to change relevant with the transversely deforming of sample and the seepage flow network structure that causes thus really.
Embodiment 2: the time dependence of investigating pressure drag behavior under the quasi-iso static pressing.
Carry out following operation respectively: control testing machine pressure head is so that fixedly compression rate (N/min) is mobile, until arriving set pressure, it is constant to keep-up pressure then, synchronous recording specimen height and resistance over time, observed thus resistance variations is defined as the resistance creep by us; Control testing machine pressure head moves with fixed displacement speed (mm/min), until arriving predetermined deformation, keeps ram position constant then, synchronous recording pressure data and resistance over time, it is lax that observed thus resistance variations is defined as resistance by us.
Fig. 4 has provided carbon black filled Conductive Composites (the packing volume mark is 13%, and fixation pressure is 1KN) at the resistance creep curve that has under the contractive condition of border.Solid line among the figure is represented resistance variations, and dotted line is represented sample deformation size.Find that from figure the mechanics creep curve of this curve and material is very close, almost overlap that the resistance of display material and macro-size change certain substantial connection of existence between (being strain).
Fig. 5 has provided carbon black filled Conductive Composites (the packing volume mark is 8%, and fixedly deformation is 1%) at the resistance relaxation curve that has under the contractive condition of border.Solid line among the figure is represented resistance variations, and dotted line is represented the suffered payload of sample.Can see that when the displacement of sample stopped suddenly, load was the exponential form decay, resistance constantly increases on the contrary.Studies show that further the pressure drag change direction before the lax experiment beginning of the direction of resistance variations is relevant, this shows, the lax unique mechanism that is different from mechanical relaxation of following of the resistance creep of system and resistance.
Embodiment 3: investigation pressure causes the seepage flow behavior to the influence and the pressure of seepage flow behavior.
Carry out following test respectively: the sample different to the packing volume mark, investigate its resistance creep behaviour under different loads respectively, arrive balance or stop experiment after the fixed time (as 2000s), the resistance value of this moment is considered as the equilibrium value of sample under this pressure, with the variation relation of packing density and draw percolation curve, investigate the influence of pressure according to resistivity of material under the different pressures to the seepage flow behavior; To the sample of variable concentrations, analyze of the change of balance resistance value with creeping pressure, investigate resistance variations---" pressure causes the seepage flow behavior " that be similar to the seepage flow behavior, disclose material microstructure change and seepage flow network evolution process under pressure whereby.
Claims (5)
1. the pseudo isostatic pressing method of research pressure drag behavior is characterized in that sample is applied uniaxial tension, and the transversely deforming of restriction sample can only occur on the one dimension direction sample deformation, and the resistance of test sample is with the situation of change of uniaxial tension.
2. the pseudo isostatic pressing method of research pressure drag according to claim 1 behavior is characterized in that said uniaxial tension comprises single load, CYCLIC LOADING, creep and the stress relaxation of one dimension direction.
3. the pseudo isostatic pressing method of research pressure drag according to claim 1 behavior, it is characterized in that said sample is the right cylinder that places pipe fitting, in cylindrical axial pressure, and arrange electrode respectively, electrode is connected with digital multimeter in cylindrical above and below.
4. the quasi-iso static pressing device that is used for the described method of claim 1, it is characterized in that this device mainly comprises pipe fitting (4), inwall at pipe fitting (4) is provided with insulation course (6), be equipped with upper ejector pin (1), lower push rod (7) and two in the pipe fitting (4) and be respectively applied for and sample both ends of the surface electrodes in contact (9), electrode (9) extension line links to each other with digital multimeter (11).
5. quasi-iso static pressing device as claimed in claim 4 is characterized in that said pipe fitting (4) is a weldless steel tube.
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| CN 200510061499 CN1773296A (en) | 2005-11-09 | 2005-11-09 | Quasi-isopressing method for researching pressure resistance behaviour and apparatus thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975544A (en) * | 2010-10-19 | 2011-02-16 | 东北大学 | Displacement measurement method based on resistance creep of composite conductive polymer pressure sensitive material |
| CN102156222A (en) * | 2011-04-01 | 2011-08-17 | 宁波大学 | Stress resistance effect measuring method for material in high strain rate state |
| CN103869164A (en) * | 2012-12-14 | 2014-06-18 | 核工业西南物理研究院 | Insulation resistance test device of ceramic coating under high pressure state |
| CN109270350A (en) * | 2018-10-26 | 2019-01-25 | 元能科技（厦门）有限公司 | A kind of pole piece resistance measuring instrument, system and method |
-
2005
- 2005-11-09 CN CN 200510061499 patent/CN1773296A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975544A (en) * | 2010-10-19 | 2011-02-16 | 东北大学 | Displacement measurement method based on resistance creep of composite conductive polymer pressure sensitive material |
| CN101975544B (en) * | 2010-10-19 | 2012-02-22 | 东北大学 | Displacement measurement method based on resistance creep of composite conductive polymer pressure sensitive material |
| CN102156222A (en) * | 2011-04-01 | 2011-08-17 | 宁波大学 | Stress resistance effect measuring method for material in high strain rate state |
| CN103869164A (en) * | 2012-12-14 | 2014-06-18 | 核工业西南物理研究院 | Insulation resistance test device of ceramic coating under high pressure state |
| CN109270350A (en) * | 2018-10-26 | 2019-01-25 | 元能科技（厦门）有限公司 | A kind of pole piece resistance measuring instrument, system and method |
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