CN108760496A - Evolvent type flexible material multi-shaft stretching testing machine - Google Patents
Evolvent type flexible material multi-shaft stretching testing machine Download PDFInfo
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- CN108760496A CN108760496A CN201810551749.3A CN201810551749A CN108760496A CN 108760496 A CN108760496 A CN 108760496A CN 201810551749 A CN201810551749 A CN 201810551749A CN 108760496 A CN108760496 A CN 108760496A
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- upper disk
- lower disc
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- flexible material
- guide groove
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- 239000000463 material Substances 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 4
- 239000013536 elastomeric material Substances 0.000 description 4
- 239000000806 elastomer Substances 0.000 description 3
- 238000009661 fatigue test Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
Abstract
The invention discloses a kind of evolvent type flexible material multi-shaft stretching testing machines, including body and the drawing mechanism on body；Drawing mechanism includes lower disc, upper disk, fixture and connecting rod；Upper disk and lower disc coaxial arrangement, lower disc is affixed with body, upper disk is rotatablely connected with body, the center of upper disk is equipped with boss, fixture is multiple and the center annular around boss is arranged on upper disk, upper disk offers involute guide groove corresponding with each fixture, lower disc is equipped with line channel corresponding with each involute guide groove, connecting rod sequentially passes through corresponding line channel and involute guide groove and is rotatablely connected with each fixture, and connecting rod can slide in corresponding line channel and involute guide groove.Involute guide groove and the cooperation of corresponding line channel, push fixture to be moved back and forth along line channel, since the pushing force angle to fixture is 0, makes frictional force minimum in mechanism kinematic, ensure that the synchronism and equality of pulling force.
Description
Technical field
The present invention relates to tensile test equipment technical field, more particularly to a kind of evolvent type flexible material multi-shaft stretching examination
Test machine.
Background technology
The mechanical property of material is often referred to deformation state or material of the material under stress condition under the conditions of given deformation
The function and effect of generated power.The mechanical property of research material, it is sometimes desirable to multidirectional power be applied to material sample, to see
Examine its deformation under the action of multi-axial forces.
Ideal multi-shaft stretching testing machine, should have the following characteristics that：
Apply multidirectional power 1. can synchronize；2. ensureing to be measured sample Uniform Tension；3. all directions can be measured accurately
Pulling force；4. the deformation of energy synchro measure sample in drawing process；5. convenient material specimen clamping.Most common twin shaft
Cupping machine example is the biaxial tension-compression strengths machines such as " cross " material, and the basic functional principle of mechanical part is to utilize step
Stepper motor drives ball screw turns, band movable slider to be moved in the linear guide, the pulling force to sample is generated with this, wherein 4
Or 2 groups of the linear guides are in cross vertical distribution, and the observation of sample deformation situation is generally used and is suspended on stretching platform
The camera of side is realized.
It is retrieved by related patents it can be found that the biaxial stretch-formed experimental facilities of existing material is all made of " cross " twin shaft
Stretching mode, specific equipment include two kinds, one is being more than 1GPa for modulus, deforming small metal material, are made using hydraulic pressure
Flowing mode is loaded, and the pulling force of generation is usually in 5kN or more；Another kind is the thin-film material for being less than 1MPa for modulus, is led to
Normal structure type is that two guide rails are installed in mutually orthogonal direction, by motor driving leading screw rotation, drives the folder on guide rail
Tool movement.
Using the first equipment the problem is that：
1, measurement accuracy is low.Since structure driving and control device are complicated, load transducer range is larger, measure modulus compared with
When small flexible material or the smaller elastomeric material of other modulus, force measurement result precision is relatively low.
2, measurement range is limited.Due to using " cross " tensile sample, specimen surface to be in effective and wait twin shafts deformation
Region area it is smaller, it is impossible to be used in measure the large deformation state of flexible material or other elastomers material.
3, aximal deformation value can not accurately be measured.Since metal material biaxial tension-compression strength machine generally use pastes the side of foil gauge
Formula carries out deformation measurement, is limited to the use condition of foil gauge, can not carry out the measurement of large strain amount.
Using second of equipment can be used for flexible material or the smaller elastomeric material of other modulus etc. it is biaxial stretch-formed
Test, but there are following several disadvantages：
1, the synchronism and equality of two axis pulling force are not easily controlled.Since experimental provision needs two stepper motors same
When drive, therefore it is very high to the synchronism and start-up and shut-down control required precision of two driving motors, if two motors are asynchronous,
The drawing force of two axis is different, and then the deformation during causing material sample to be stretched is uneven, the twin shafts such as cannot meet and become
The condition of shape.And the precision of most stepper motors all cannot really meet the control requirement of synchronism；
2, measurement range is limited.Due to use " cross " tensile sample, specimen surface is in effective in drawing process
The region area of equal twin shafts deformation is smaller, and the maximum distortion range that can be measured is limited to the length of guide rail and leading screw.
3, it is only used for carrying out the stable state of material sample or the biaxial stretch-formed experiment such as quasi-static, it is impossible to be used in the cycle of sample
Tensile fatigue test.Since the mechanical clearance of lead screw transmission mode is big, mechanical execution efficiency is relatively low, and dynamic response performance is poor,
Fixture can not be driven to carry out the reciprocating motion of high speed, thus equipment can not be used for cyclic tension fatigue test.
4, flexible material or other high-elastic elastomer materials have special physical property, are answered only with what one-off drawing obtained
Force-strain curve is not enough to the description complete tensile mechanical properties of high resiliency body, and the biaxial stretch-formed experimental machine such as current metal does not have
There are the effective experimental method and data processing method for high resiliency body.
5, sample holder is difficult, and material is easy de- folder or pinch off in drawing process.
Invention content
The purpose of the present invention is to provide a kind of evolvent type flexible material multi-shaft stretching testing machines, to solve the prior art
Present in above-mentioned technical problem.
Evolvent type flexible material multi-shaft stretching testing machine provided by the invention, including body and be mounted on the body
On drawing mechanism；
The drawing mechanism includes lower disc, upper disk, fixture and connecting rod；
The upper disk and the lower disc coaxial arrangement, the lower disc and the body are affixed, the upper disk and
The center of the body rotation connection, the upper disk is equipped with boss, and the fixture is multiple and surrounds the boss
Center annular be arranged on the upper disk, the upper disk offers involute corresponding with each fixture and leads
Slot, the lower disc are equipped with line channel corresponding with each involute guide groove, and the connecting rod sequentially passes through correspondence
The line channel and the involute guide groove be rotatablely connected with each fixture, the connecting rod can be corresponding described
Sliding in line channel and the involute guide groove.
Further, first basic circle, first base are drawn around the center of circle of the upper disk on the upper disk
Round circumference is equipped with the upper disk Along ent consistent with the fixture quantity, using each upper disk Along ent as starting point,
The involute of first basic circle is done on the upper disk, these involutes are the center line of the involute guide groove；
On the lower disc second consistent with first basic circle of a diameter is drawn around the center of circle of the lower disc
Along ent on first basic circle is projected to formation lower disc Along ent on the circumference of second basic circle, with institute by basic circle
It is starting point to state lower disc Along ent, the tangent line of the second basic circle is done on the lower disc, these tangent lines are the line channel
Center line.
Further, the extending direction of the extending direction and the line channel of the involute guide groove is reversed.
Further, further include non-contact laser tens(i)ometer, the non-contact laser tens(i)ometer and the upper disk
It connects and is arranged above the fixture.
Further, the upper disk is equipped with connecting hole, and the non-contact laser tens(i)ometer passes through support arm and institute
State connecting hole connection.
Further, the body includes rack, driving motor, shaft and backplate, and the driving motor is mounted on described
In rack, the driving motor is connect by the shaft with the center of the upper disk, and the backplate is mounted on the rack
On, the lower disc and the rack are affixed.
Further, the fixture includes pedestal, clamping piece and force snesor；The pedestal connects with the link rotatable
It connects, the clamping piece is connect by the force snesor with the pedestal.
Further, the clamping piece includes two clamp arm being hinged, and is equipped with and twists between the tail portion of two clamp arm
Tight screw, the screw of tightening are connect with a clamp arm, and two clamp arm heads are embedded with the flat ball of hemispherical respectively.
Further, the lower disc is consistent with the diameter of upper disk.
Further, the lower disc is equipped with holder connecting hole, and the lower disc passes through the holder connecting hole and institute
It is affixed to state rack.
Evolvent type flexible material multi-shaft stretching testing machine provided by the invention, has the following advantages that：
1. involute guide groove and the cooperation of corresponding line channel, can push fixture to be moved back and forth along line channel, and
And since the pushing force angle to fixture is 0, it ensure that frictional force is minimum in mechanism kinematic.
2. overall structure uses centrosymmetric design method, it can be ensured that when upper disk rotational, circumferential all fixtures can
To be moved synchronously in a manner of centrosymmetric, to it ensure that stretching-release during, it is tested flexible material sample circumferentially
All directions homogeneous deformation, while also ensuring the synchronism and equality of pulling force.
3. due to the special nature of involute structure, the displacement that fixture occurs during movement under force turns with upper disk
The angle crossed is directly proportional, and therefore, the angle that can be turned over by the upper disk of control controls the deformation state of measured material sample.
4. can be not only used for the isometric loading-unloading cyclic tension of flexible material and elastomeric material, while can be with
Quasi-static tensile and multiaxis dynamic fatigue test for flexible material and elastomeric material.
5. can guarantee during load or unload, the uniform force on each position of sample circumference and remain synchronous
6. during load or unload, greatly reduce due to sample discontinuity caused by the factors such as mechanical friction
Or the degree of measurement result inaccuracy.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the structural schematic diagram for the evolvent type flexible material multi-shaft stretching testing machine that the embodiment of the present invention one provides.
Fig. 2 is the structure that the evolvent type flexible material multi-shaft stretching testing machine that the embodiment of the present invention one provides hides backplate
Schematic diagram.
Fig. 3 is the structural schematic diagram for the upper disk that the embodiment of the present invention one provides.
Fig. 4 is the structural schematic diagram for the lower disc that the embodiment of the present invention one provides.
Fig. 5 is the movement and Force principle figure one that the embodiment of the present invention one provides.
Fig. 6 is the movement and Force principle figure two that the embodiment of the present invention one provides.
Fig. 7 is the movement and Force principle figure three that the embodiment of the present invention one provides.
Fig. 8 is the movement and Force principle figure four that the embodiment of the present invention one provides.
Fig. 9 is the connection relationship diagram of fixture and connecting rod that the embodiment of the present invention one provides.
Figure 10 is the connection relationship diagram of upper disk and boss that the embodiment of the present invention one provides.
Figure 11 is stress-strain experiment of the flexible body material that provides of the embodiment of the present invention one under equal twin shafts deformation condition
Curve.
Reference numeral：1- bodies；2- drawing mechanisms；21- lower discs；The upper disks of 22-；23- fixtures；24- connecting rods；3- is gradually opened
Linear guide groove；4- line channels；The first basic circles of 5-；The upper disk Along ents of 51-；6- involutes；The second basic circles of 7-；71- lower discs
Along ent；8- tangent lines；9- non-contact laser tens(i)ometers；221- connecting holes；10- support arms；11- racks；12- driving motors；
13- shafts；14- backplates；15- boss；211- holder connecting holes；25- pedestals；26- clamping pieces；27- force snesors；261- is pressed from both sides
Arm；262- tightens screw；The flat ball of 263- hemisphericals.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for description purposes only, and is not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
Embodiment one：
Fig. 1 is the structural schematic diagram for the evolvent type flexible material multi-shaft stretching testing machine that the embodiment of the present invention one provides；
Fig. 2 is the structural schematic diagram that the evolvent type flexible material multi-shaft stretching testing machine that the embodiment of the present invention one provides hides backplate；
Fig. 3 is the structural schematic diagram for the upper disk that the embodiment of the present invention one provides；Fig. 4 is the lower disc that the embodiment of the present invention one provides
Structural schematic diagram；Fig. 5 is the movement and Force principle figure one that the embodiment of the present invention one provides；Fig. 6 is that the embodiment of the present invention one carries
The movement of confession and Force principle figure two；Fig. 7 is the movement and Force principle figure three that the embodiment of the present invention one provides；Fig. 8 is this hair
The movement and Force principle figure four that bright embodiment one provides；Fig. 9 is the connection of fixture and connecting rod that the embodiment of the present invention one provides
Relation schematic diagram；Figure 10 is the connection relationship diagram of upper disk and boss that the embodiment of the present invention one provides；Figure 11 is this hair
Stress-strain empirical curve of the flexible body material that bright embodiment one provides in the case where waiting twin shafts deformation condition；Such as Fig. 1-Figure 11 institutes
Show, evolvent type flexible material multi-shaft stretching testing machine provided by the invention, including body 1 and on the body 1
Drawing mechanism 2；
The drawing mechanism 2 includes lower disc 21, upper disk 22, fixture 23 and connecting rod 24；
The upper disk 22 and the lower disc 21 are coaxially disposed, and the lower disc 21 and the body 1 are affixed, it is described on
Disk 22 is rotatablely connected with the body 1, and the center of the upper disk 22 is equipped with boss 15, which is to put
Flexible material sample to be tested is set, height design will ensure that fixture 23 is facilitated to be clamped when sample is placed on above, and
In drawing process, vertical height of the sample apart from upper disk 22 remains constant, i.e., will not because of sample itself weight and
Additional pulling force is generated, the fixture 23 is multiple and the center annular around the boss 15 is arranged in the upper disk 22
On, the upper disk 22 offers involute guide groove 3 corresponding with each fixture 23, the lower disc 21 be equipped with
3 corresponding line channel 4 of each involute guide groove, the connecting rod 24 sequentially pass through corresponding 4 He of the line channel
The involute guide groove 3 is rotatablely connected with each fixture 23, and the connecting rod 24 can be in corresponding 4 He of the line channel
Sliding in the involute guide groove 3.
Specifically, on the upper disk 22 around the upper disk 22 the center of circle draw first basic circle 5, described first
The circumference of basic circle 5 is equipped with the upper disk Along ent 51 consistent with 23 quantity of the fixture, with each upper disk Along ent
51 be starting point, and the involute 6 of first basic circle 5 is done on the upper disk 22, these involutes 6 are the involute
The center line of guide groove 3；
It is with first basic circle 5 consistent that around the center of circle of the lower disc 21 diameter is drawn on the lower disc 21
Second basic circle 7 projects to the upper disk Along ent 51 on first basic circle 5 on the circumference of second basic circle 7 under being formed
Disk Along ent 71 is starting point with lower disc Along ent 71, the tangent line 8 of the second basic circle 7 is done on the lower disc 21, these are cut
Line 8 is the center line of the line channel 4.
It is equipped on the above disk 22 for ten fixtures 23, is ten parts by the circumference equal dividing of the first basic circle 5, if upper disk
Along ent 51 is P1, P2, P3 ... P10, is starting point with each upper disk Along ent 51, the first basic circle 5 is done on upper disk 22
Involute 6, these involutes 6 are the center line of the involute guide groove 3；Meanwhile ten upper circles of 5 circumference of the first basic circle
Disk Along ent 51 projects to and forms lower disc Along ent 71 on the circumference of the second basic circle 7, under ten on the circumference of the second basic circle 7
Disk Along ent 71 is Q1, Q2, Q3 ... Q10, is starting point with each lower disc Along ent 71, the second basic circle is done on lower disc 21
7 tangent line 8, these tangent lines 8 are the center line of the line channel 4.
It is, in principle, that in 22 rotary course of upper disk, due to the special nature of involute curve, involute guide groove
The thrust of 3 pairs of connecting rods 24 can drive connecting rod 24 to be remained in involute guide groove 3 and line channel 4 and vertically move, i.e.,
If above upper disk 22, it is observed that the sliding in involute guide groove 3 of connecting rod 24；And if from lower disc 21
Side is seen, it is observed that connecting rod 24 synchronously slides in line channel 4.
Due to the geometrical relationship of involute guide groove 3, line channel 4 and the first basic circle 5, the second basic circle 7, in upper disk 22
In rotation process, connecting rod 24 can keep the vertically sliding in involute guide groove 3 and line channel 4, will not be because of upper circle
22 velocity of rotation of disk is too fast and wrong of movement occurs or moves stuck situation.And since involute guide groove 3 and straight line are led
Slot 4 is circumferentially evenly distributed, therefore with the rotation of upper disk 22, each connecting rod 24 is in respective involute guide groove 3
With may be implemented synchronously to slide in line channel 4, i.e., at any time, each connecting rod 24 remains phase at a distance from the center of circle
Together.
It can be seen that in 22 rotation process of upper disk from Fig. 4-Fig. 7, thrust side of the involute guide groove 3 to connecting rod 24
To always consistent with the direction of motion of connecting rod 24, and along the tangential direction of basic circle, therefore pushing force angle is 0, is moved through
Additional frictional force is not generated in journey.
Specifically, the extending direction of the extending direction and the line channel 4 of the involute guide groove 3 is reversed.
Specifically, further include non-contact laser tens(i)ometer 9, the non-contact laser tens(i)ometer 9 and the upper disk
22 connect and are arranged above the fixture 23.
Using non-contact laser tens(i)ometer 9, and non-contact laser tens(i)ometer 9 is rotated synchronously with the deformation of sample,
It can keep rotating synchronously with specific region on sample always, the deformation state of the same area on trace trap sample, it is ensured that become
The accuracy that shape measures.
In drawing process, strain is measured by non-contact laser tens(i)ometer 9 and passes through experimental machine data processor meter
It obtains.
Computational methods are as follows：
The purpose for designing the evolvent type cupping machine is to obtain flexible body material as shown in the figure in equal twin shafts
Stress-strain empirical curve under deformation condition.
The data wherein strained by gauge length section in measurement drawing process deflection and obtained by calculating, and gauge length section
Deflection is obtained by contactless tens(i)ometer (or other contactless deformation measuring devices) measurement.If experiment starts preceding rubber
The measurement distance of gauge length section is L on sample0, the measurement distance of any time gauge length section is L during experiment beginning post-tensioningt, then
Any time calculation formula of corresponding flexible body material sample elongation strain ε is：
The data of stress by measure the force sensor summation of drawing process institute and divided by round tensile sample lateral area
It is calculated.Assuming that sharing n fixture, then n sensor, a diameter of D of tensile sample, thickness t, after experiment starts are shared
The power measured on any time each sensor in drawing process is Fi(i=1,2 ..., n), then any time is corresponding soft
The calculation formula of elastomer material sample tensile stress σ is：
It can be proved by Elasticity method, this is isometric to stretch obtained strain regime and the biaxial stretch-formed condition such as absolutely
Under strain regime it is identical.
Specifically, the upper disk 22 is equipped with connecting hole 221, and the non-contact laser tens(i)ometer 9 passes through support arm
10 connect with the connecting hole 221.
Specifically, the body 1 includes rack 11, driving motor 12, shaft 13 and backplate 14, and the driving motor 12 is pacified
In the rack 11, the driving motor 12 is connect by the shaft 13 with the center of the upper disk 22, the shield
Plate 14 is mounted in the rack 11, and the lower disc 21 and the rack 11 are affixed.
Specifically, the lower disc 21 is equipped with holder connecting hole 211, and the lower disc 21 passes through holder connecting hole 211
It is affixed with the rack 11.
Specifically, the fixture 23 includes pedestal 25, clamping piece 26 and force snesor 27；The pedestal 25 and the connecting rod
24 rotation connections, the clamping piece 26 are connect by the force snesor 27 with the pedestal 25, strong on each fixture 23
Sensor 27, the pulling force that each force snesor 27 measures are the power on fixture 23 where it.
Specifically, the clamping piece 26 includes two clamp arm 261 being hinged, between the tail portion of two clamp arm 261
Equipped with screw 262 is tightened, the screw 262 of tightening is connect with a clamp arm 261, and two 261 head of clamp arm difference are embedding
Equipped with the flat ball of hemispherical 263.
In sample holder, the power that two clamp arm 261 act on sample holder end can be controlled by tightening screw 262,
Convenient for specimen clamping and dismounting；Wherein the flat ball of hemispherical 263 ensures that retained part can be with sample in loading procedure
Rotation and rotate synchronously.
By fixture 23 provided by the present application, ensures that clamping force is enough, and can be rotated synchronously with sample deformation, ensure examination
Sample is in the state uniformly upheld always.
Specifically, the lower disc 21 is consistent with the diameter of the upper disk 22.
Specifically, the groove width of multiple involute guide grooves 3 on the upper disk 22 is consistent, more on the lower disc 21
The groove width of a line channel 4 is consistent, also, involute guide groove 3 is consistent with the groove width of line channel 4.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of evolvent type flexible material multi-shaft stretching testing machine, which is characterized in that including body and be mounted on the machine
Drawing mechanism on body；
The drawing mechanism includes lower disc, upper disk, fixture and connecting rod；
The upper disk and the lower disc coaxial arrangement, the lower disc and the body are affixed, the upper disk with it is described
Body is rotatablely connected, and the center of the upper disk is equipped with boss, and the fixture is multiple and in the boss
Thimble shape is arranged on the upper disk, and the upper disk offers involute guide groove corresponding with each fixture, institute
It states lower disc and is equipped with line channel corresponding with each involute guide groove, the connecting rod sequentially passes through corresponding described
Line channel and the involute guide groove are rotatablely connected with each fixture, and the connecting rod can be led in the corresponding straight line
Sliding in slot and the involute guide groove.
2. evolvent type flexible material multi-shaft stretching testing machine according to claim 1, which is characterized in that in the upper circle
First basic circle is drawn around the center of circle of the upper disk on disk, the circumference of first basic circle is equipped with and the fixture quantity
Consistent upper disk Along ent does first basic circle using each upper disk Along ent as starting point on the upper disk
Involute, these involutes are the center line of the involute guide groove；
A diameter second basic circle consistent with first basic circle is drawn around the center of circle of the lower disc on the lower disc,
Along ent on first basic circle is projected to formation lower disc Along ent on the circumference of second basic circle, with the lower circle
Disk Along ent is starting point, the tangent line of the second basic circle is done on the lower disc, these tangent lines are the center of the line channel
Line.
3. evolvent type flexible material multi-shaft stretching testing machine according to claim 1, which is characterized in that the involute
The extending direction of shape guide groove and the extending direction of the line channel are reversed.
4. evolvent type flexible material multi-shaft stretching testing machine according to claim 1, which is characterized in that further include non-connect
Touch laser tens(i)ometer, the non-contact laser tens(i)ometer connect with the upper disk and are arranged above the fixture.
5. evolvent type flexible material multi-shaft stretching testing machine according to claim 4, which is characterized in that the upper disk
It is equipped with connecting hole, the non-contact laser tens(i)ometer is connect by support arm with the connecting hole.
6. evolvent type flexible material multi-shaft stretching testing machine according to claim 1, which is characterized in that the body packet
Including rack, driving motor, shaft and backplate, the driving motor are mounted in the rack, and the driving motor passes through described
Shaft is connect with the center of the upper disk, and the backplate is mounted in the rack, and the lower disc and the rack are affixed.
7. evolvent type flexible material multi-shaft stretching testing machine according to claim 1, which is characterized in that the fixture packet
Include pedestal, clamping piece and force snesor；The pedestal is connect with the link rotatable, and the clamping piece passes through the force snesor
It is connect with the pedestal.
8. evolvent type flexible material multi-shaft stretching testing machine according to claim 7, which is characterized in that the clamping piece
It is equipped with including two clamp arm being hinged, between the tail portion of two clamp arm and tightens screw, it is described to tighten described in screw and one
Clamp arm connects, and two clamp arm heads are embedded with the flat ball of hemispherical respectively.
9. evolvent type flexible material multi-shaft stretching testing machine according to claim 1, which is characterized in that the lower disc
It is consistent with the diameter of upper disk.
10. evolvent type flexible material multi-shaft stretching testing machine according to claim 6, which is characterized in that the lower circle
Disk is equipped with holder connecting hole, and the lower disc is affixed by the holder connecting hole and the rack.
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