CN202814794U - Plastic film unidirectional tensile test device based on constant strain rate - Google Patents
Plastic film unidirectional tensile test device based on constant strain rate Download PDFInfo
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- CN202814794U CN202814794U CN 201220475317 CN201220475317U CN202814794U CN 202814794 U CN202814794 U CN 202814794U CN 201220475317 CN201220475317 CN 201220475317 CN 201220475317 U CN201220475317 U CN 201220475317U CN 202814794 U CN202814794 U CN 202814794U
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- tensile test
- test device
- plastic sheeting
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Abstract
The utility model discloses a plastic film unidirectional tensile test device based on constant strain rate. The plastic film unidirectional tensile test device comprises an electric heating system, a drive mechanism, a stretching mechanism and a computer, wherein the electric heating system comprises a constant temperature box, and the stretching mechanism is arranged in the constant temperature box; the stretching mechanism comprises a bottom plate, as well as a cylinder-shaped barrel, a bracket, a rolling bearing, a vertical groove, a guide rail, a clamp and a pressure plate which are arranged on the bottom plate; two ends of the cylinder-shaped barrel are arranged on the bracket through the rolling bearing; the vertical groove is arranged on the guide rail through a slider and can slide along the guide rail; the clamp is arranged on the vertical groove, a semi-cylinder-shaped groove is formed at the clamp, and one side of the pressure plate is provided with a semi-cylinder-shaped boss matched with the semi-cylinder-shaped groove, so as to fix a plastic film test sample; a main shaft of the barrel penetrates through a constant temperature box body to be connected with the drive mechanism, and is provided with a tension sensor which is connected with the computer. The plastic film unidirectional tensile test device has simple and feasible technological means, as well as positive technical effects and positive popularization and application values.
Description
Technical field
The present invention relates to the mechanical meaurement technical field of plastic sheeting, particularly a kind of plastic sheeting one directional tensile test method and apparatus based on constant strain speed.
Background technology
Plastic sheeting (thickness≤0.5mm) in constant strain speed
Deformation process in true stress
And logarithmic strain
, be an important mechanics parameter of plastic sheeting.
On traditional stretched plastic film testing machine, under constant stretch speed V, can't guarantee constant strain rate.And the stretching that will realize constant strain rate can only be by following two methods:
One, by calculating the V in the constant strain rate situation, at set intervals, manually adjusts V by the operator, with the perseverance that realizes being similar to
Tension test.
Two, the appendage opertaing device is right to change at any time V on common cupping machine
Automatically control.
More than the shortcoming of two kinds of methods be that precision is not high; Particularly when V is larger, cause the error meeting excessive.In addition, there is following difficulty in the mechanical behavior under high temperature of plastic sheeting test: film is after glass temperature Tg because the material deliquescing becomes sticky, to the clamping of material with more and more difficult.
Summary of the invention
Goal of the invention of the present invention is for the technical deficiency of existing plastic sheeting one directional tensile test method and apparatus, and a kind of plastic sheeting one directional tensile test device based on constant strain speed is provided.
Further, provide a kind of plastic sheeting one directional tensile test method based on constant strain speed.
For achieving the above object, the technical solution used in the present invention is:
A kind of plastic sheeting one directional tensile test device based on constant strain speed is provided, comprises electric heating system, driving mechanism, drawing mechanism and computing machine; Electric heating system comprises constant temperature oven, and drawing mechanism places in the constant temperature oven; Described drawing mechanism comprises base plate and places rotatingcylindrical drum, support, rolling bearing, vertical slots, guide rail, anchor clamps and pressing plate on the base plate; The two ends of described rotatingcylindrical drum are located on the support by rolling bearing; Described vertical slots is located on the guide rail by slide block and can be slided along guide rail, and described anchor clamps are located on the vertical slots; Have the semicolumn groove on the described anchor clamps, described pressing plate has the semicolumn boss with the semicolumn groove fit; Be used for the fixed plastics film sample; The main shaft of described rotatingcylindrical drum passes the constant temperature oven casing and is connected with driving mechanism, also is provided with pulling force sensor on the described main shaft, and described pulling force sensor is connected with computing machine.
Preferably, described drawing mechanism also comprises the cylinder pressing plate, and the middle part of described rotatingcylindrical drum is provided with the plane that cooperates for the cylinder pressing plate, and described cylinder pressing plate is bolted on this plane.
Preferably, be provided with the film pad between the mating surface of described anchor clamps and pressing plate.
Preferably, described electric heating system comprises heating arrangement, temperature measuring equipment and temperature sensor, and described heating arrangement, temperature measuring equipment and temperature sensor all place in the constant temperature oven, and are electrically connected between the three; Described temperature sensor also is connected with computing machine.
Preferably, described constant temperature oven comprises casing and Box Cover, and thermostatic box and thermostatic box lid all are enclosed with foam.
Preferably, described anchor clamps are bolted and are installed on the vertical slots.
Preferably, described pressing plate is bolted and is installed on the anchor clamps.
Further, provide a kind of plastic sheeting one directional tensile test method based on constant strain speed, comprise the steps:
(1) opens Box Cover, unclamp for the fixing bolt of vertical slots and guide rail; Scale on the guide rail is as benchmark, the mobile slide block that is installed on the guide rail, thereby mobile vertical slots, and then adjust the gauge length of plastic sheeting; Gauge length is clutched bolt after determining;
(2) unclamp for the bolt of fixedly vertical slots and anchor clamps and the bolt that is used for stationary fixture and pressing plate, one end of plastic sheeting is clamped between anchor clamps and the pressing plate, and add that between plastic sheeting and pressing plate the film pad is combined closely it, then, tighten bolt for stationary fixture and pressing plate;
(3) unclamp bolt for holding cylindrical cylinder and cylinder pressing plate, with plastic sheeting around one week of cylinder and be through between rotatingcylindrical drum and the cylinder pressing plate; Then, tighten bolt for holding cylindrical cylinder and cylinder pressing plate;
(4) move up and down anchor clamps, simultaneously slightly rotational circle cylindricality cylinder makes plastic sheeting and bottom surface keeping parallelism, tightens for the fixing bolt of vertical slots and anchor clamps;
(5) cover Box Cover, make device keep sealing; Open the heating arrangement of electric heating system, then determine the transient temperature value by the data of temperature sensor, and regulate the power of electric heating system according to this transient temperature value; The internal temperature of constant temperature oven is remained unchanged in measuring process;
(6) motor of startup driving mechanism is set motor speed, and rotatingcylindrical drum is rotated with uniform angular velocity;
(7) under the stretching action of constant strain rate, plastic sheeting generation plastic yield, pulling force sensor is transferred to computing machine with pulling force data, draws precise information after the Computer Analysis.
The distance of preferably, establishing between centre of the drum's line and the anchor clamps left side is the initial length of plastic sheeting calibration line
L 0 , instantaneous length is
LThe stretching initial time is 0, and the stretching instantaneous time is
tThe plastic sheeting original width is
B 0, original depth is
T 0 , the initial cross-section area is
A 0 , instantaneous area of section is
A (t)The rotatingcylindrical drum diameter is
D, rotating speed is
W, peripheral velocity is
V, the moment of torsion that transient measurement obtains is
M (t)The instantaneous unilateral stretching power that is subject to of plastic sheeting is
P (t), instantaneous logarithmic strain is
, instantaneous true stress is
, the Hencky strain rate is
Suppose that cylinder is in constant rotational speed
WUnder rotatablely move, then:
According to the mechanical balance relation as can be known, the instantaneous stretching power that the plastic sheeting two ends are subject to
P (t)For:
（3）；
The deviation of ignoring engineering strain speed and logarithmic strain speed, the plastic sheeting instantaneous cross section
AWill be along with the time
tBe index variation.Under constant Hencky strain rate condition, then have:
(4);
Associating (3) formula and (4) Shi Kede:
Be approximately Newtonian fluid when supposing plastic sheeting near molten condition, then the instantaneous rheology viscosity of material
Can be expressed as:
（6）；
By (1)～(6) formula as can be known, in drawing process, as long as the record instantaneous time
t, and measure this moment cylinder moment of torsion
M (t)With constant drum rotation speed
W, can directly calculate corresponding true stress, logarithmic strain or rheology viscosity number.
The present invention has following beneficial effect with respect to prior art:
The plastic sheeting one directional tensile test apparatus structure that the present invention is based on constant strain speed is simple, and simple operation cooperatively interacts with stretching test method, transfer data to computing machine by pulling force sensor after, accurately draw the stretching data of plastic sheeting.In addition, the technology of the present invention means are simple and easy to do, have positive technique effect and application value.
Description of drawings
Fig. 1 is drawing mechanism structural representation of the present invention;
Fig. 2 is the structure for amplifying synoptic diagram of anchor clamps 9 among Fig. 1.
Embodiment
Below in conjunction with the drawings and specific embodiments goal of the invention of the present invention is described in further detail, embodiment can not give unnecessary details one by one at this, but therefore embodiments of the present invention are not defined in following examples.Unless stated otherwise, material and the job operation of the present invention's employing are the art conventional material and job operation.
As shown in Figure 1, a kind of plastic sheeting one directional tensile test device based on constant strain speed comprises electric heating system, driving mechanism, drawing mechanism and computing machine.Electric heating system comprises constant temperature oven, and drawing mechanism places in the constant temperature oven.Drawing mechanism comprises base plate 1 and places rotatingcylindrical drum 4 on the base plate 1, support 2, rolling bearing 3, vertical slots 7, guide rail 6, anchor clamps 9 and pressing plate 10.The two ends of rotatingcylindrical drum 4 are located on the support 2 by rolling bearing 3.Vertical slots 7 is located on the guide rail 6 by slide block and can be slided along guide rail 6, and anchor clamps 9 are located on the vertical slots 7.Have the semicolumn groove on the anchor clamps 9, pressing plate 10 has the semicolumn boss with the semicolumn groove fit, is used for fixed plastics film 11.The main shaft of rotatingcylindrical drum 4 passes the constant temperature oven casing and is connected with driving mechanism; Also be provided with pulling force sensor on the main shaft, described pulling force sensor is connected with computing machine.Electric heating system comprises heating arrangement, temperature measuring equipment and temperature sensor, and heating arrangement, temperature measuring equipment and temperature sensor all place in the constant temperature oven, and are electrically connected between the three; Temperature sensor also is connected with computing machine.Constant temperature oven comprises casing and Box Cover, and thermostatic box and thermostatic box lid all is enclosed with the foam anchor clamps and is bolted and is installed on the vertical slots.
Drawing mechanism also comprises cylinder pressing plate 5, and the middle part of described rotatingcylindrical drum 4 is provided with the plane that cooperates for cylinder pressing plate 5, and cylinder pressing plate 5 is bolted on this plane.Be provided with film pad 8 between the mating surface of anchor clamps 9 and pressing plate 10.Pressing plate 10 is bolted and is installed on the anchor clamps 9.
Further, provide a kind of plastic sheeting one directional tensile test method based on constant strain speed, comprise the steps:
(1) opens Box Cover, unclamp for the bolt of fixing vertical slots 7 with guide rail 6; Scale on the guide rail 6 is as benchmark, the mobile slide block that is installed on the guide rail 6, thereby mobile vertical slots 7, and then adjust the gauge length of plastic sheeting; Gauge length is clutched bolt after determining;
(2) unclamp for the bolt of fixing vertical slots 7 and anchor clamps 9 and the bolt that is used for stationary fixture 9 and pressing plate 10, one end of plastic sheeting 11 is clamped between anchor clamps 9 and the pressing plate 10, and add that between plastic sheeting 11 and pressing plate 10 film pad 8 is combined closely it, then, tighten for the bolt of stationary fixture 9 with pressing plate 10;
(3) unclamp bolt for holding cylindrical cylinder 4 and cylinder pressing plate 5, with plastic sheeting 11 around 4 one weeks of rotatingcylindrical drum and be through between rotatingcylindrical drum 4 and the cylinder pressing plate 5; Then, tighten bolt for holding cylindrical cylinder 4 and cylinder pressing plate 5;
(4) move up and down anchor clamps 9, simultaneously slightly rotational circle cylindricality cylinder 4 makes plastic sheeting 11 and base plate 1 keeping parallelism, tightens for the fixing bolt of vertical slots 7 and anchor clamps 9;
(5) cover Box Cover, make device keep sealing; Open the heating arrangement of electric heating system, then determine the transient temperature value by the data of temperature sensor, and regulate the power of electric heating system according to this transient temperature value; The internal temperature of constant temperature oven is remained unchanged in measuring process;
(6) motor of startup driving mechanism is set motor speed, and rotatingcylindrical drum is rotated with uniform angular velocity;
(7) under the stretching action of constant strain rate, plastic sheeting generation plastic yield, pulling force sensor is transferred to computing machine with pulling force data, draws precise information after the Computer Analysis.
The distance of preferably, establishing between rotatingcylindrical drum 4 center lines and anchor clamps 9 left sides is the initial length of plastic sheeting calibration line
L 0 , instantaneous length is
LThe stretching initial time is 0, and the stretching instantaneous time is
tThe plastic sheeting original width is
B 0, original depth is
T 0 , the initial cross-section area is
A 0 , instantaneous area of section is
A (t)Diameter of cylinder is
D, rotating speed is
W, peripheral velocity is
V, the moment of torsion that transient measurement obtains is
M (t)The instantaneous unilateral stretching power that is subject to of plastic sheeting is
P (t), instantaneous logarithmic strain is
, instantaneous true stress is
, the Hencky strain rate is
Suppose that cylinder is in constant rotational speed
WUnder rotatablely move, then:
According to the mechanical balance relation as can be known, the instantaneous stretching power that the plastic sheeting two ends are subject to
P (t)For:
The deviation of ignoring engineering strain speed and logarithmic strain speed, the plastic sheeting instantaneous cross section
AWill be along with the time
tBe index variation.Under constant Hencky strain rate condition, then have:
Associating (3) formula and (4) Shi Kede:
（5）；
Be approximately Newtonian fluid when supposing plastic sheeting near molten condition, then the instantaneous rheology viscosity of material
Can be expressed as:
（6）；
By (1)～(6) formula as can be known, in drawing process, as long as the record instantaneous time
t, and measure this moment cylinder moment of torsion
M (t)With constant drum rotation speed
W, can directly calculate corresponding true stress, logarithmic strain or rheology viscosity number.
Above-described embodiment is preferred embodiment of the present invention only, is not to limit practical range of the present invention.Be that all equalizations of doing according to content of the present invention change and modification, all contained by claim of the present invention scope required for protection.
Claims (7)
1. the plastic sheeting one directional tensile test device based on constant strain speed is characterized in that: comprise electric heating system, driving mechanism, drawing mechanism and computing machine; Electric heating system comprises constant temperature oven, and drawing mechanism places in the constant temperature oven; Described drawing mechanism comprises base plate and places rotatingcylindrical drum, support, rolling bearing, vertical slots, guide rail, anchor clamps and pressing plate on the base plate; The two ends of described rotatingcylindrical drum are located on the support by rolling bearing; Vertical slots is located on the guide rail by slide block and can be slided along guide rail, and anchor clamps are located on the vertical slots; Have the semicolumn groove on the described anchor clamps, described pressing plate has the semicolumn boss with the semicolumn groove fit, is used for the fixed plastics film sample; The main shaft of described rotatingcylindrical drum passes the constant temperature oven casing and is connected with driving mechanism, also is provided with pulling force sensor on the described main shaft, and described pulling force sensor is connected with computing machine.
2. the plastic sheeting one directional tensile test device based on constant strain speed according to claim 1, it is characterized in that: described drawing mechanism also comprises the cylinder pressing plate, the middle part of described rotatingcylindrical drum is provided with the plane that cooperates for the cylinder pressing plate, and described cylinder pressing plate is bolted on this plane.
3. the plastic sheeting one directional tensile test device based on constant strain speed according to claim 1 is characterized in that: be provided with the film pad between the mating surface of described anchor clamps and pressing plate.
4. the plastic sheeting one directional tensile test device based on constant strain speed according to claim 1, it is characterized in that: described electric heating system comprises heating arrangement, temperature measuring equipment and temperature sensor, described heating arrangement, temperature measuring equipment and temperature sensor all place in the constant temperature oven, and are electrically connected between the three; Described temperature sensor also is connected with computing machine.
5. the plastic sheeting one directional tensile test device based on constant strain speed according to claim 1, it is characterized in that: described constant temperature oven comprises casing and Box Cover, thermostatic box and thermostatic box lid all are enclosed with foam.
6. the plastic sheeting one directional tensile test device based on constant strain speed according to claim 1, it is characterized in that: described anchor clamps are bolted and are installed on the vertical slots.
7. described plastic sheeting one directional tensile test device based on constant strain speed according to claim 1-6, it is characterized in that: described pressing plate is bolted and is installed on the anchor clamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220475317 CN202814794U (en) | 2012-09-18 | 2012-09-18 | Plastic film unidirectional tensile test device based on constant strain rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220475317 CN202814794U (en) | 2012-09-18 | 2012-09-18 | Plastic film unidirectional tensile test device based on constant strain rate |
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| Publication Number | Publication Date |
|---|---|
| CN202814794U true CN202814794U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220475317 Withdrawn - After Issue CN202814794U (en) | 2012-09-18 | 2012-09-18 | Plastic film unidirectional tensile test device based on constant strain rate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879267A (en) * | 2012-09-18 | 2013-01-16 | 华南理工大学 | Unilateral plastic film stretching test method and device based on constant strain rate |
| CN104535429A (en) * | 2014-12-08 | 2015-04-22 | 国家烟草质量监督检验中心 | Rolling-like film material tension property detection apparatus and rolling-like film material tension property detection method |
| CN106404552A (en) * | 2016-11-18 | 2017-02-15 | 盐城工学院 | Monitoring device and in-situ tensioning device |
| CN109933101A (en) * | 2019-03-15 | 2019-06-25 | 上海交通大学 | A kind of high-precision uniform stress field film two directions tension control device |
| 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 |
-
2012
- 2012-09-18 CN CN 201220475317 patent/CN202814794U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879267A (en) * | 2012-09-18 | 2013-01-16 | 华南理工大学 | Unilateral plastic film stretching test method and device based on constant strain rate |
| CN104535429A (en) * | 2014-12-08 | 2015-04-22 | 国家烟草质量监督检验中心 | Rolling-like film material tension property detection apparatus and rolling-like film material tension property detection method |
| CN104535429B (en) * | 2014-12-08 | 2018-11-09 | 国家烟草质量监督检验中心 | Web-like coating materials tensile properties detection device and web-like coating materials tensile properties detection method |
| CN106404552A (en) * | 2016-11-18 | 2017-02-15 | 盐城工学院 | Monitoring device and in-situ tensioning device |
| CN109933101A (en) * | 2019-03-15 | 2019-06-25 | 上海交通大学 | A kind of high-precision uniform stress field film two directions tension control device |
| 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 |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130320 Effective date of abandoning: 20140730 |
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| RGAV | Abandon patent right to avoid regrant |