CN207472674U - A kind of axis pulling experiment device of web or pieces of cloth - Google Patents
A kind of axis pulling experiment device of web or pieces of cloth Download PDFInfo
- Publication number
- CN207472674U CN207472674U CN201721697366.4U CN201721697366U CN207472674U CN 207472674 U CN207472674 U CN 207472674U CN 201721697366 U CN201721697366 U CN 201721697366U CN 207472674 U CN207472674 U CN 207472674U
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- wedge
- pieces
- cloth
- collet
- web
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Abstract
The utility model discloses a kind of web or the axis pulling experiment devices of pieces of cloth, collet and lower axle are drawn to draw collet including upper axis；Upper axis is drawn to be connected at the top of collet with the upper pull head of tensile testing machine, and lower axle draws chuck portion to be connected with the lower pull head of tensile testing machine；Upper axis draws collet and lower axle that collet is drawn to include connector, Y type power transmissions rod piece, steel shaft and Wedge gripping；Y type power transmissions rod piece includes the trunk being wholely set and two wooden fork branches, the tail end of trunk are provided with the hinged ball being hinged with spherical groove；The longitudinal section of steel shaft is semicircle, and the tail end of two wooden fork branches is connected with steel shaft；Steel shaft is provided centrally with wedge-shaped impression, and Wedge gripping can be inserted into wedge-shaped impression；Wedge gripping includes two blocks of steel clamp plates being oppositely arranged, and the opposite side of steel clamp plate is both provided with erose striped.The utility model can be by web or pieces of cloth effectively clamping and centering, and simple in structure, easy to operate, method is reliably and test accuracy is higher.
Description
Technical field
The utility model is related to a kind of device for detecting mechanical property, the axis pulling experiment dress of particularly a kind of web or pieces of cloth
It puts.
Background technology
In recent years, with the development of material industry, some are with excellent properties such as high intensity, high elastic modulus, low-density
Fibrous material (such as carbon fiber, basalt fibre and aramid fiber) be widely used in national economy every field.Wherein,
The composite materials such as high-performance fiber cloth, the resin base of net and its enhancing and cement base are because with high-strength light, corrosion-resistant, construction
The advantages that convenient and effect on environment is small, just gradually applied in the reinforcing of concrete structure, reinforcement and new structural systen.
In practical structures, web, cloth play enhancing muscle, and tensile mechanical performance is to influence composite property and reinforcement and strengthening effect
The key of fruit.
When carrying out the tensile strength test of web, cloth, it is desirable that web is drawn with fixture when Relative sliding does not occur
Break, at this time the cohesive force F between fibre bundle and fixturesThe ultimate tension of fibre bundle is should be greater than, i.e.,：
Fs≥nσfAf (1)
In formula, n is the radical of single-stranded fiber rove in fibre bundle；σfFor the tensile strength of single-stranded fiber rove, unit
MPa；AfFor the area of section of single-stranded fiber rove, unit mm2；FsCohesive force between fibre bundle and fixture, unit N.
Cohesive force F between fibre bundle and fixturesIt is calculated by such as following formula (2)：
Fs=τuπdeql (2)
In formula, τuFor the average bond intensity between fibre bundle and fixture (containing rubber sheet gasket), units MPa；τuIt is contacted with fixture
Frictional force F between facefIt is directly proportional, FfMore big then τuIt is bigger；Anchorage lengths or clamping length of the l for fibre bundle, unit mm；deqFor
The equivalent diameter of single-stranded fiber rove, unit mm.
Assuming that the chucking power that fixture provides is FN, confficient of static friction between fibre bundle and fixture rubber pad for μ (contact surface without
μ=0.6~0.9 in the case of erose striped).Then frictional force FfWith chucking power FNRelationship can be expressed with following formula：
Ff=μ FN (3)
Enable τu=Ff/ k, association type (1)~(3), can obtain cohesive force Fs, chucking power FNWith fibre tensile strength σfRelationship：
In formula, k is frictional force FfWith average bond intensity τuProportionality coefficient.
At present, the tensile mechanical performance about web, cloth, manufacturer is mostly by the tension of single fiber or fiber roving
Performance indicator provides, because of the area of section very little of sub-thread (i.e. during n=1) fiber roving, the pulling force very little needed for break of CFRP,
According to formula (4) it is found that required chucking power FNWith regard to small, common fixture or adhesive can provide enough clampings
Power.However, for web (cloth) piece being made of more (when i.e. n is very big) fiber rovings, since fibre section product can increase
Several times, pulling force during destruction is very big, therefore required chucking power is bigger, is then difficult to ensure that with adhesive or general clamping device
Enough chucking powers to accurately obtain the tensile strength of web (cloth) piece, need to develop special tensile test apparatus and carry out
Test, since such device is less at present, so most of tensile property manufacturer for fiber mat (cloth) does not provide.
But fiber be in process of production since fault in material can generate inhomogeneities, cause single fiber rove tensile property and
By the tensile property of whole web (cloth) piece that plurality of fibers rove forms there are certain difference, and web (cloth) piece
Practical tensile property is most important for practical engineering application, therefore need to be drawn using special experimental rig and test method
Experiment is stretched, to obtain relatively accurate tensile property.
It is to influence test knot in the tensile property test of web (cloth) sheet material, whether effective clamping of sheet material is with centering
The key link of fruit, but highly desirable measure, measured sheet material tensile mechanical there is no for the control of the two links at present
Often discreteness is very big for performance.For this reason, it is necessary to for web, cloth sheet material the suitable device of tensile property test development and
Easy, reliable method.
Utility model content
The technical problems to be solved in the utility model be in view of the above shortcomings of the prior art, and provide a kind of web or
The axis pulling experiment device of the axis pulling experiment device of pieces of cloth, the web or pieces of cloth can be by web or pieces of cloth effectively clamping and right
In, simple in structure, easy to operate, method is reliably and test accuracy is higher.
In order to solve the above technical problems, the technical solution adopted in the utility model is：
The axis pulling experiment device of a kind of web or pieces of cloth draws collet and lower axle to draw collet including upper axis；Upper axis draws collet
Top is connected with the upper pull head of tensile testing machine, and lower axle draws chuck portion to be connected with the lower pull head of tensile testing machine.
Upper axis draws collet and lower axle that collet is drawn to include connector, Y type power transmissions rod piece, steel shaft and Wedge gripping.
One end of connector is connected with upper pull head or lower pull head, and the other end of connector is provided with spherical groove.
Y type power transmissions rod piece includes the trunk being wholely set and two wooden fork branches, the tail end of trunk are provided with and spherical groove phase
Hinged hinged ball.
The longitudinal section of steel shaft is semicircle, and the tail end of two wooden fork branches is connected with steel shaft；Steel shaft is provided centrally with wedge
Connected in star, Wedge gripping can be inserted into wedge-shaped impression.
Wedge gripping includes two blocks of steel clamp plates being oppositely arranged, and the opposite side of steel clamp plate is both provided with erose item
Line.
The side of wedge-shaped impression is provided with horizontal scale ruler one, and horizontal scale ruler two is provided on Wedge gripping.
Capable of opening and closing auxiliary lock is provided in steel shaft, auxiliary lock can be by the Wedge gripping packet in wedge-shaped impression
It covers in being locked at.
Connector is connected by pin with upper pull head or lower pull head.
The both ends of steel shaft are both provided with transmission rod mounting hole, two wooden fork branches of Y type power transmission rod pieces with corresponding transmission rod
Mounting hole is threadedly coupled.
The utility model with the above structure, has the advantages that：
(1) present invention can effectively clamp web or pieces of cloth, realize effective measurement of web or pieces of cloth tensile property.
(2) the erose striped of Wedge gripping inner surface setting, has extremely strong snap-in force, so as to ensure wedge grip
Has effective clamping to web or pieces of cloth.In addition, in Wedge gripping and wedge-shaped impression wedge shape setting, can drawing process by
Step strengthens chucking power of the Wedge gripping to web or pieces of cloth, so as to solve the pass in web or pieces of cloth Erichsen test
Effective clamping of the fixture to sheet material during one of key technology namely axis pulling experiment.
(3) setting of the spherical groove of above-mentioned connector namely hinged ball, flexural pivot can be freely rotated, so as to ensure that web
Or pieces of cloth automatic centering under axial tension effect.
(4) in traditional web or pieces of cloth Erichsen test, for ensure fixture to web or pieces of cloth effectively about
Beam, it usually needs using expensive resin glue caking agent or curing agent with anchoring fiber net or pieces of cloth, this meeting in fixture
The unfavorable factors such as cause excessively high experimentation cost, waste of material and test time be long.And the wedge shape that this experimental rig uses
Fixture does not need to effectively clamp web or pieces of cloth using binding agent and curing agent, while cost-effective
Improve the operability and recycling rate of waterused of device.
(5) setting of horizontal scale ruler, can auxiliary fiber net or the installation positioning of pieces of cloth and axis drawing centering.In addition, auxiliary
During lock can prevent experiment, the problem of falling such as fixture caused by web or pieces of cloth are broken.
In conclusion apparatus of the present invention are rational in infrastructure, connection is reliable, easy to operate, repeatable utilization, fibre can be effectively measured
The axial tension performance of net or pieces of cloth is tieed up, more structurally sound experiment dress can be provided for the Mechanics Performance Testing of high performance fibre material
It puts and technical support.
Description of the drawings
Fig. 1 shows the structure diagram of the axis pulling experiment device of a kind of web of the utility model or pieces of cloth.
Fig. 2 shows flexural pivot schematic diagram.
Fig. 3 shows the schematic diagram of Y type power transmission rod pieces.
Fig. 4 shows the stereogram of Wedge gripping.
Fig. 5 shows the side view of Wedge gripping.
Fig. 6 shows the stereogram of steel shaft.
Fig. 7 shows the sectional view of steel shaft.
Fig. 8 shows the analysis schematic diagram of double wedge in circle A areas in Fig. 5.
Fig. 9 shows the force analysis schematic diagram of Wedge gripping and wedge-shaped impression.
Wherein have：
10. axis draws collet on；
11. connector；111. pin；112. spherical groove；12.Y type power transmission rod pieces；121. trunk；122. hinged ball；123.
Wooden fork branch；
13. steel shaft；131. transmission rod mounting hole；132. wedge-shaped impression；133. horizontal scale ruler one；134. auxiliary lock；
14. Wedge gripping；141. steel clamp plates；142. erose stripeds；143. horizontal scale rulers two；144. double wedge；
145. groove；
20. lower axle pull head；
Pull head on 31.；32. lower pull head；
40. web or pieces of cloth test block.
Specific embodiment
The utility model is described in further detail with specific better embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, the axis pulling experiment device of a kind of web or pieces of cloth, draws collet 10 and lower axle to draw collet including upper axis
20。
Upper axis is drawn to be connected at the top of collet with the upper pull head 31 of tensile testing machine, and lower axle draws chuck portion and tensile testing machine
Lower pull head 32 be connected.
Upper axis draws collet and lower axle that collet is drawn to include connector 11, Y type power transmissions rod piece 12, steel shaft 13 and Wedge gripping
14。
As shown in Fig. 2, one end of connector is preferably connected by pin 111 with upper pull head or lower pull head, connector
The other end is provided with spherical groove 112.
Y type power transmissions rod piece includes the trunk 121 being wholely set and two wooden fork branches 123, and the tail end of trunk is provided with and spherical shape
The hinged ball 122 that groove is hinged.
The longitudinal section of steel shaft is semicircle, and the tail end of two wooden fork branches is connected with steel shaft.The both ends of steel shaft are preferably set
Transmission rod mounting hole 131 is equipped with, two wooden fork branches of Y type power transmission rod pieces are preferably threadedly coupled with corresponding transmission rod mounting hole.
Steel shaft is provided centrally with wedge-shaped impression 132, and Wedge gripping can be inserted into wedge-shaped impression.
Capable of opening and closing auxiliary lock 134 is further preferably provided in steel shaft, auxiliary lock can will be in wedge-shaped impression
Including Wedge gripping is coated and locked.
Wedge gripping includes two blocks of steel clamp plates 141 being oppositely arranged, and the opposite side of steel clamp plate is both provided with erose
Striped 142.
The setting of above-mentioned erose striped, on the one hand increases roughness, so as to friction coefficient μ ' (μ '>μ) increase greatly
Add；And shaggy tooth is meshed can also generate mechanical snap power and pin power.Therefore, by formula (3) and formula (4) it is found that cohesive force
FsIt can improve a lot, further ensure that formula (1) is set up, i.e. web bare terminal end in stretch breaking process does not slide.In addition,
Erose striped can also increase the anchorage length of fiber and clamping plate.
As shown in figure 8, erose striped preferably includes the double wedge 144 of interlaced setting and groove 145, double wedge is indulged
It is isosceles trapezoid to section, the tooth top of double wedge is the upper bottom edge of isosceles trapezoid, and the tooth root of double wedge is the bottom of isosceles trapezoid.
Assuming that the addendum width of double wedge is a, the tooth root width of double wedge is b, and the overall height of double wedge is h, two bevel edges of double wedge
Angle with horizontal direction is β, and the raising coefficient of the anchorage length of web or pieces of cloth isThen meet and formula is calculated as below：
In formula (5), 0<β<Pi/2,Then by formula (4) it is found that cohesive force FsIt can increaseTimes, it can be further assured that
Do not occur end sliding in web drawing process.
Further, as shown in figure 9, the side of above-mentioned Wedge gripping towards wedge-shaped impression is preferably triangle.Wedge gripping
Lateral compression power can gradually enhance in drawing process.If pulling force is F, during tension, Wedge gripping can be by wedge shape
The constraint of groove generates the extruding force F in the vertical face on two inclined-planesN' be：
By formula (6) it is found that FN', extruding force F directly proportional to FN' increase, pulling force F≤n σ with the increase of pulling force FfAf.Then
Total chucking power F of Wedge grippingNIt " can be calculated as follows
FN"=FN+FN′ (7)
By formula (4) it is found that when chucking power further increases, then cohesive force FsIncrease, τ in formula (2)uFurther increase.
Accordingly, it is considered to above-mentioned factor is to cohesive force FsIncrease effect, while introduce enhancement coefficient ψ (ψ>1) and consider to press from both sides
Have tool snap-in force and pin power that erose striped generates to average bond intensity τuIncrease effect, then in formula (5)
Cohesive force FsF can be modified tos', it can be calculated as follows：
In conclusion cohesive force Fs' much larger than Fs, it can be ensured that formula (1) meets.I.e. the clamping device of apparatus of the present invention can carry
For enough cohesive forces, ensure that web will not generate sliding in drawing process and extract phenomenon.It can effectively measure by more
Tow groups into web or pieces of cloth tensile property.
Two blocks of above-mentioned steel clamp plates are preferably bolted in top edge.Web or pieces of cloth are being positioned over two blocks of steel clamp plates
Between before, layer of plastic film pad first should be respectively padded on the inner surface of two blocks of steel clamp plates, with reduce test during steel clamp plate it is direct
It contacts and is damaged caused by fibre bundle.
Further, the side of wedge-shaped impression is provided with horizontal scale ruler 1, and horizontal scale ruler is provided on Wedge gripping
2 143.The setting of horizontal scale ruler can guarantee that the center line of Wedge gripping and the wedge-shaped impression center line of steel shaft coincide.
A kind of axis pulling experiment method of web or pieces of cloth, includes the following steps.
Step 1, connector is installed：One end of connector is connected respectively with the pull head of tensile testing machine, connector
Inside of spherical groove is placed hinged.
Step 2, Y types power transmission rod piece is installed：By being hinged and connected in the tail end and step 1 of the trunk of Y type power transmission rod pieces
It connects, two wooden fork branch ends of Y type power transmission rod pieces is passed through and fixed from the transmission rod mounting hole of corresponding steel shaft respectively.
Step 3, web or pieces of cloth test block clamping：First one layer is respectively padded in the inner surface of two blocks of steel clamp plates of Wedge gripping
Rubber pad then passes through at the both ends of the web cut or pieces of cloth test block from the wedge-shaped impression of two steel shafts respectively,
Followed by being pierced by web or pieces of cloth test block between end is placed in two blocks of steel clamp plates of corresponding Wedge gripping, and make fiber
Net or pieces of cloth test block are in straightened condition, are then closed two blocks of steel clamp plates, and web or pieces of cloth test block is made to be in and clamp shape
State.
Step 4, Wedge gripping clamping：The Wedge gripping that web or pieces of cloth test block are clamped in step 3 is inserted into steel
In the wedge-shaped impression of axis, during insertion, preferably by by the horizontal scale ruler on the horizontal scale ruler two on Wedge gripping and steel shaft
One compare to mode, the center line of wedge-shaped impression in the center line and steel shaft of Wedge gripping is made to coincide.Wedge gripping is inserted into
After the completion of the wedge-shaped impression of steel shaft, it is preferred to use Wedge gripping is locked together in wedge-shaped impression by auxiliary lock.
Step 5, axis pulling experiment：Tensile testing machine is opened and is loaded, and during experiment, hinged ball energy automatic rotary modulation is whole
Position makes web or pieces of cloth test block be in Shaft alignment state；Meanwhile the load-displacement curve of web or pieces of cloth test block
It is measured and is acquired by the load and displacement sensor installed on tensile testing machine.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail, within the scope of the technical concept of the present invention, a variety of equivalents can be carried out to technical scheme of the present invention, this
A little equivalents all belong to the scope of protection of the present invention.
Claims (5)
1. a kind of axis pulling experiment device of web or pieces of cloth, it is characterised in that：Collet and lower axle is drawn to draw collet including upper axis；On
Axis is drawn to be connected at the top of collet with the upper pull head of tensile testing machine, and lower axle draws chuck portion to be connected with the lower pull head of tensile testing machine
It connects；
Upper axis draws collet and lower axle that collet is drawn to include connector, Y type power transmissions rod piece, steel shaft and Wedge gripping；
One end of connector is connected with upper pull head or lower pull head, and the other end of connector is provided with spherical groove；
Y type power transmissions rod piece includes the trunk being wholely set and two wooden fork branches, and the tail end of trunk is provided with to be hinged with spherical groove
Hinged ball；
The longitudinal section of steel shaft is semicircle, and the tail end of two wooden fork branches is connected with steel shaft；Being provided centrally with for steel shaft is wedge-shaped recessed
Slot, Wedge gripping can be inserted into wedge-shaped impression；
Wedge gripping includes two blocks of steel clamp plates being oppositely arranged, and the opposite side of steel clamp plate is both provided with erose striped.
2. the axis pulling experiment device of web according to claim 1 or pieces of cloth, it is characterised in that：The side of wedge-shaped impression
Horizontal scale ruler one is provided with, horizontal scale ruler two is provided on Wedge gripping.
3. the axis pulling experiment device of web according to claim 1 or pieces of cloth, it is characterised in that：Energy is provided in steel shaft
The auxiliary lock of folding, including the Wedge gripping in wedge-shaped impression can be coated and locked for auxiliary lock.
4. the axis pulling experiment device of web according to claim 1 or pieces of cloth, it is characterised in that：Connector passes through pin
It is connected with upper pull head or lower pull head.
5. the axis pulling experiment device of web according to claim 1 or pieces of cloth, it is characterised in that：The both ends of steel shaft are all provided with
Transmission rod mounting hole is equipped with, two wooden fork branches of Y type power transmission rod pieces are threadedly coupled with corresponding transmission rod mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721697366.4U CN207472674U (en) | 2017-12-08 | 2017-12-08 | A kind of axis pulling experiment device of web or pieces of cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721697366.4U CN207472674U (en) | 2017-12-08 | 2017-12-08 | A kind of axis pulling experiment device of web or pieces of cloth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207472674U true CN207472674U (en) | 2018-06-08 |
Family
ID=62257237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721697366.4U Expired - Fee Related CN207472674U (en) | 2017-12-08 | 2017-12-08 | A kind of axis pulling experiment device of web or pieces of cloth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207472674U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007768A (en) * | 2017-12-08 | 2018-05-08 | 河海大学 | The axis pulling experiment device and test method of a kind of web or pieces of cloth |
| CN114778303A (en) * | 2022-06-20 | 2022-07-22 | 新沂崚峻光电科技有限公司 | Laser film tension detection device and detection method |
-
2017
- 2017-12-08 CN CN201721697366.4U patent/CN207472674U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007768A (en) * | 2017-12-08 | 2018-05-08 | 河海大学 | The axis pulling experiment device and test method of a kind of web or pieces of cloth |
| CN114778303A (en) * | 2022-06-20 | 2022-07-22 | 新沂崚峻光电科技有限公司 | Laser film tension detection device and detection method |
| CN114778303B (en) * | 2022-06-20 | 2022-09-02 | 新沂崚峻光电科技有限公司 | Laser film tension detection device and detection method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180608 Termination date: 20201208 |
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| CF01 | Termination of patent right due to non-payment of annual fee |