CN103115851A - Giant current variant shearing strength testing device and testing method thereof - Google Patents
Giant current variant shearing strength testing device and testing method thereof Download PDFInfo
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- CN103115851A CN103115851A CN2013100319667A CN201310031966A CN103115851A CN 103115851 A CN103115851 A CN 103115851A CN 2013100319667 A CN2013100319667 A CN 2013100319667A CN 201310031966 A CN201310031966 A CN 201310031966A CN 103115851 A CN103115851 A CN 103115851A
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Abstract
The invention discloses a giant current variant shearing strength testing device which is characterized by comprising a metal material tester, a shearing rod and a shearing cylinder, wherein the opening at one end of the shearing cylinder forms a port and is internally provided with a giant current variant; the shearing rod is a column body and one end of the shearing rod is connected with the metal material tester; and the other end of the shearing rod axially enters the port of the shearing cylinder and stretches into the giant current variant. The invention further discloses a giant current variant shearing strength testing method. Compared with the prior art, the giant current variant shearing strength testing device has the advantages that the giant current variant shearing strength can be obtained by dividing the numerical value of the force displayed on the metal material tester by the cross section of the shearing rod, the shearing force can be really reflected, and the testing result is very high in accuracy.
Description
Technical field
The present invention relates to a kind of testing device for shear strength, relate in particular to a kind of giant electro-rheological body testing device for shear strength, the invention still further relates to a kind of giant electro-rheological body method for testing shear strength.
Background technology
The giant electro-rheological body is to be scattered in by polarizable dielectric particles a kind of suspending liquid that forms in base fluid, its viscosity, shear resistance, rheological behaviour etc. can be with reversible, the controlled transformations of variation moment generation of electric field under the effect of electric field, when loading electric field, performance is instantaneous changes for its viscosity, shear resistance etc., becomes different viscosity fluids, difficult viscoelastic body or the immobilising high viscosity solid of flowing by runny low viscosity fluid.After electric field removes, it can return in the millisecond time or in more hour its original state---fluid state again, and institute's energy requirement is very little, can be from self top layer or the outside change information that obtains about environmental baseline, and judge, process and make response, change self structure and damping function in good time and it is coordinated with the external world well, have the self-adapting intelligent regulatory function.This reversible, controlled continuous variation characteristic, and good automatically controlled behavior are with a wide range of applications in fields such as defence equipment, the vehicles, hydraulically operated equipment (HOE), machinery manufacturing industry, sensor technologies.
Self-adapting intelligent electro rheological fluids damping shock absorber integrates the advanced technologies such as machinery, intelligent sensing control and intellectual material structure, give full play to the inherent characteristic of giant electro-rheological body, by an adjustable voltage generation regulating device is set on the devices such as damper, adjust the viscosity of the electro rheological fluids in electric field by the intensity that changes electric field, thereby damping adjusting power, can greatly simplify modular construction, component weight is significantly alleviated; Can prepare simple structure, the technique easily damping vibration attenuation of New type of current variant, the vibration isolator of row.And damping vibration attenuation, vibration isolator is highly sensitive, noise is little, the life-span is long, cost is low; Can combine with computing machine, sensor measuring, Based Intelligent Control etc. and come moment coupling and regulate the viscosity of electro rheological fluids according to the kinetic characteristic of device and military service ambient condition, control damping force, be returned to the state of balance with the fastest speed and the shortest time.
Giant electro-rheological body vibration damper and vibration isolator mainly utilize the giant electro-rheological body that is filled in wherein, under electric field action, the variation of apparent viscosity, damping characteristic significantly and rapidly changes this effect, make their damping force or the ratio of damping can step-less adjustment, reach the controlled purpose of damping.The response that while giant electro-rheological body damper has is quick, is easy to reach the level of Millisecond; Simple in structure; The advantages such as during work, power consumption is little, noiselessness are the high performance devices of new generation of realizing intelligent vibration control.
Electric rheological effect is because the polarization of electric field for particulate produces. under electric field action, the positive and negative charge of particulate separates, positive charge is shifted to a particulate side of close negative electrode, negative charge is shifted to a particulate side of close positive charge, particle alignment becomes chain structure, extend to another electrode from an electrode, and at the gap location that does not form particle chains, attract each other between particulate and consist of fibrous arrangement.When chain was subject to shear action, particulate was pulled open, and because electric charge is still attracting each other, thereby produced shear stress.Extra electric field is higher, and the attractive force between this electric charge is stronger, therefore shear stress is larger.Yet the shear strength of electro rheological fluids is lower all the time, needs to load higher outer field voltage, and stability is not high, and its range of application is very limited, and has seriously hindered the development of giant electro-rheological body.The giant electro-rheological body of exploitation in 2003, make its shear resistance surpass 100kPa, this breakthrough is worth to the huge applications that people show the giant electro-rheological body, has excited the upsurge from giant electro-rheological body material to structural researches such as giant electro-rheological body dampers at home and abroad.
Although the giant electro-rheological body has huge application potential in theory, practical application is few.Its main cause is that present nearly all giant electro-rheological body all can't satisfy the application demand of high comprehensive mechanical property, good temperature and suspension stability etc. simultaneously.More lack for the giant electro-rheological bulk properties research of the specific demands such as damping device and device structure design thereof and according to material, structure, device, the control integrated design of device property demand.
The discovery of giant electro-rheological body is worth to the huge applications that people show electro rheological fluids, application facet at electro rheological fluids, countries in the world particularly developed country are all successively dropped into huge fund and have been developed multiple electro rheological fluids device, some Hesperian national defence and industrial sector drop into hundreds of millions of funds, carry out the research of er material and damping device thereof.U.S.'s " federal Scientific Engineering and technology coordination committee " classifies the research of electro rheological fluids as a key areas, point out in USDOE's " about final report of electro rheological fluids Research Requirements appraisal ", " electro rheological fluids is potential become electric--the highest a kind of of energy efficiency in conversion; and reasonable price, compact conformation, quick, the durable in use and variable dynamic range of response, these characteristics are that any other is electric--conversion method all can't be accomplished ".
The method of testing of existing electro rheological fluids shear resistance has drum type brake and flat two kinds, rotational viscosimeter, general urceolus is fixed, the temperature of required control when being easier to control viscosity measurement, but the maximum shortcoming of one is can not be used under high rotating speed (or high-rate of shear) test to low viscosity fluid liquid thereon produces huge centrifugal force because the inner core of High Rotation Speed might make adhesion, and make measure the laminar condition that must guarantee because vortex becomes the non-laminar flow state., and finally form turbulent flow, make measuring error huge.Simultaneously, the difference that the diameter between two cylinders or radius ratio are brought is very large, therefore, when design, it is had strict regulation, 1.00≤R
2/ R
1≤ 1.10; Strictly speaking, between two cylinders, different radii its shear stress of place and shear rate are different, but to Newtonian fluid, think that both are identical.Although during the drum type brake test, rotating speed hangs down, shear rate is arranged still still, and the non-linear accuracy that also affects test result of shear rate, can't truly reflect to have effect of end surface by static properties, the roughness of pole plate affects measurement result, especially when low roughness.
The roughness of pasting plate directly affects measurement result, and especially when low roughness, skidding is one of principal element that affects measurement result.The border effect of end surface of its surrounding also can not be ignored simultaneously, only has when two plates are enough large, and the shearing force of its generation just reflects the performance of giant electro-rheological body truly.One-piece construction is simple, is easy to make and realize.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of measurement giant electro-rheological body testing device for shear strength accurately for the above-mentioned state of the art.
Another technical matters to be solved by this invention is to provide conveniently giant electro-rheological body testing device for shear strength of a kind of measurement for the above-mentioned state of the art.
Another technical matters to be solved by this invention is to provide a kind of measurement giant electro-rheological body method for testing shear strength accurately for the above-mentioned state of the art.
Another technical matters to be solved by this invention is to provide conveniently giant electro-rheological body method for testing shear strength of a kind of measurement for the above-mentioned state of the art.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of giant electro-rheological body testing device for shear strength, it is characterized in that this device comprises metallic material testing machine, shears rod and shears cylinder, this shearing cylinder one end opening forms port and is built-in with the giant electro-rheological body, aforementioned shearing rod is that cylinder and an end are connected with metallic material testing machine, and the other end axially passes into the port of shearing cylinder and extend in the giant electro-rheological body.
Described shearing cylinder port is provided with the orienting sleeve of an axial hollow, and described shearing rod runs through by this orienting sleeve.Orienting sleeve can guarantee to shear rod and move along horizontal direction, plays the guiding stabilization.
As preferably, the described length-diameter ratio of shearing cylinder and shearing rod all 〉=5.
As preferably, the described diameter 〉=2mm that shears rod.
Further, described shearing cylinder is also cylinder.
Described shearing rod can be axial hollow, and described shearing rod can be also solid material.
As preferably, the CTM6001 microcomputer controlled electronic universal testing machine that is provided by strong instrument manufacturing (Shanghai) Co., Ltd. of association is provided described metallic material testing machine.Can certainly adopt other metallic material testing machine, not enumerate here.
A kind of method of testing of giant electro-rheological body shear resistance is characterized in that comprising the steps:
Load electric field first for the giant electro-rheological body, metallic material testing machine is started, metallic material testing machine promotes to shear rod with constant speed and moves in the tool electro rheological fluids, demonstrate on metallic material testing machine and shear the power F that rod is subject to, then according to formula τ=F/S, calculate under the electric field of particular load, the size of huge electric current shear resistance τ, the S in formula is for shearing the area of excellent xsect.
Compared with prior art, the invention has the advantages that: the numerical value according to the power that shows on metallic material testing machine can obtain giant electro-rheological body shear resistance divided by the xsect of shearing rod, and is convenient and swift.Simultaneously, there be not nonlinear problem and the effect of end surface problem of shear rate, the size of energy actual response shearing force, the test result accuracy is high.
Description of drawings
Fig. 1 is embodiment 1 structural representation.
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
Embodiment 1, as shown in Figure 1, giant electro-rheological body testing device for shear strength comprises metallic material testing machine 1, shears rod 3 and shears cylinder 2, shearing cylinder 2 is that cylinder and an end opening form port, shear cylinder 2 and dispose a plug 5, shear cylinder 2 and be built-in with giant electro-rheological body 6, shearing rod 3 is that cylinder and an end are connected with metallic material testing machine 1, and the other end axially passes into the port of shearing cylinder 2 and extend in giant electro-rheological body 6.
Further, shear the orienting sleeve 4 that cylinder 2 ports are provided with an axial hollow, shear rod 3 and run through by orienting sleeve 4.Shear the length-diameter ratio of cylinder 2 and shearing rod 3 all 〉=5.
The CTM6001 microcomputer controlled electronic universal testing machine that is provided by strong instrument manufacturing (Shanghai) Co., Ltd. of association is provided metallic material testing machine 1.
The method of testing of giant electro-rheological body shear resistance comprises the steps:
Load electric field first for giant electro-rheological body 6, metallic material testing machine 1 is started, metallic material testing machine 1 promotes to shear rod 3 with constant speed and moves horizontally in tool electro rheological fluids 6, demonstrate on metallic material testing machine 1 and shear the rod 3 power F that are subject to, then according to formula τ=F/S, calculate under the electric field of particular load, the size of huge electric current shear resistance τ, the S in formula is the area of the xsect of shearing rod 3.
Shearing bar material in the present embodiment is T10, and shearing rod is solid material, diameter 3mm, and the roughness of shearing rod is enough little, Ra≤0.08.The diameter of shearing cylinder is 50mm, shears the length of cylinder and selects 300mm, and the roughness of shearing barrel is enough large, Ra 〉=12.5, the material 40CrMo of shearing cylinder.Be fit to measure the shear resistance less than 80kPa.
Embodiment 2, shearing bar material in the present embodiment is T10, shearing rod is solid material, diameter 5mm, and the roughness of shearing rod is enough little, Ra≤0.08, the diameter of shearing cylinder is 50mm, shears the length of cylinder and selects 150mm, and the roughness of shearing barrel is enough large, Ra 〉=12.5, the material 40CrMo of shearing cylinder.Be fit to measure the shear resistance of 80kPa ~ 200kPa.Other structure reference examples 1.
Embodiment 3, and the shearing bar material in the present embodiment is T10, and shearing rod is axial hollow, and internal diameter is 8mm, and external diameter is 12mm, and the roughness of shearing rod is enough little, Ra≤0.08, and the diameter of shearing cylinder is 50mm.Be fit to measure the shear resistance less than 500kPa.Other structure reference examples 1.
Claims (8)
1. giant electro-rheological body testing device for shear strength, it is characterized in that this device comprises metallic material testing machine, shears rod and shears cylinder, this shearing cylinder one end opening forms port and is built-in with the giant electro-rheological body, aforementioned shearing rod is that cylinder and an end are connected with metallic material testing machine, and the other end axially passes into the port of shearing cylinder and extend in the giant electro-rheological body.
2. giant electro-rheological body testing device for shear strength according to claim 1, is characterized in that the described orienting sleeve that the cylinder port is provided with an axial hollow of shearing, and described shearing rod runs through by this orienting sleeve.
3. giant electro-rheological body testing device for shear strength according to claim 1 is characterized in that the described length-diameter ratio of shearing cylinder and shearing rod all 〉=5.
4. giant electro-rheological body testing device for shear strength according to claim 1, is characterized in that the described diameter 〉=2mm that shears rod.
5. giant electro-rheological body testing device for shear strength according to claim 1, is characterized in that described shearing cylinder also is cylinder.
6. giant electro-rheological body testing device for shear strength according to claim 1, it is characterized in that described shearing rod is axial hollow, or described shearing rod is solid material.
7. giant electro-rheological body testing device for shear strength according to claim 1, is characterized in that the CTM6001 microcomputer controlled electronic universal testing machine that described metallic material testing machine adopts to be provided by strong instrument manufacturing (Shanghai) Co., Ltd. of association.
8. a method of testing of utilizing the giant electro-rheological body shear resistance of any one proving installation in claim 1 ~ 7, is characterized in that comprising the steps:
Load electric field first for the giant electro-rheological body, metallic material testing machine is started, metallic material testing machine promotes to shear rod with constant speed and moves in the tool electro rheological fluids, demonstrate on metallic material testing machine and shear the power F that rod is subject to, then according to formula τ=F/S, calculate under the electric field of particular load, the size of huge electric current shear resistance τ, the S in formula is for shearing the area of excellent xsect.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112185074A (en) * | 2020-09-28 | 2021-01-05 | 杨美兰 | Overload early warning device manufactured by utilizing rheopectic energy-saving furniture |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112185074A (en) * | 2020-09-28 | 2021-01-05 | 杨美兰 | Overload early warning device manufactured by utilizing rheopectic energy-saving furniture |
| CN112185074B (en) * | 2020-09-28 | 2021-12-21 | 江西行宇家具制造有限公司 | Overload early warning device manufactured by utilizing rheopectic energy-saving furniture |
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