CN202533321U - Short-scale distance extensometer for uniaxial tensile test - Google Patents
Short-scale distance extensometer for uniaxial tensile test Download PDFInfo
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- CN202533321U CN202533321U CN2011205754219U CN201120575421U CN202533321U CN 202533321 U CN202533321 U CN 202533321U CN 2011205754219 U CN2011205754219 U CN 2011205754219U CN 201120575421 U CN201120575421 U CN 201120575421U CN 202533321 U CN202533321 U CN 202533321U
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- extensometer
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- tensile test
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- hook
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Abstract
The utility model discloses a short-scale distance extensometer for a uniaxial tensile test. The short-scale distance extensometer for the uniaxial tensile test comprises a shell, an elastic element, a foil gauge, a limiting scale distance rod, a pair of hooks, a pair of blades and a pair of deformation transfer rods, wherein the blades, the hooks and the transformation transfer rods are sequentially assembled from inside to outside. According to the extensometer, a lower measurement limit of the extensometer can reach 5mm, so that a problem about the accurate measurement of deformation of a small-sized tensile test piece is well solved.
Description
Technical field
The utility model relates to a kind of Mechanics Performance Testing equipment, more particularly, relates to a kind of small tenon that can measure the deflection of small size sample and uses extensometer apart from uniaxial tensile test.
Background technology
Small tenon belongs to deformation measuring device apart from the axial tension extensometer.In the material extending performance test, sample is stressed to deform, and the accurate mensuration of sample deformation is determining yield point elongation rate (A
e), regulation plastic elongation intensity, fracture breaking elongation (A
t), maximum, force breaking elongation (A
Gt), stipulate remaining extensibility, strain rate
The mensuration of a series of important mechanical index such as elastic modulus (E), n value and r value.Therefore, deflection is one of the most most important content of material mechanical performance test.In uniaxial tensile test, generally monitor material in the deformation process that adds under the Axial Loads with extensometer, promptly measure the deflection of extensometer gage length section in drawing process.And extensometer gage length is generally determined by the gauge length of tensile sample.For the tensile sample gauge length, standard GB/T 228-2002 " metal material tensile test at room temperature method " is recommended the preferential short proportional test bar that adopts scale-up factor k=5.65.Regulation according to GB/T 228-2002 appendix A, appendix B, appendix C and appendix D; It is 25mm (50mm), 50mm (100mm), 100mm (200mm) sample that circular proportional test bar preferentially adopts gauge length; Thickness adopts 50mm, two kinds of gauge lengths of 80mm less than the rectangle disproportional sample of 3mm; Thickness adopts 50mm, 80mm, three kinds of gauge lengths of 200mm greater than the rectangle disproportional sample of 3mm, and wire rod sample disproportional sample adopts 100mm, two kinds of gauge lengths of 200mm.This shows that the gauge length of existing extensometer is generally several kinds of 25mm, 50mm, 80mm, 100mm, 200mm.The axial deformation extensometer gage length scope that present domestic each extensometer manufacturing firm can produce is generally between 10mm～200mm.The report of gauge length less than the extensometer of 10mm do not arranged as yet.< the small size tensile sample of 10mm is because its sample marking distance section is less than the lower limit of present extensometer gage length scope, so existing extensometer can't directly be measured the sample deformation amount for the gauge length section.Therefore, at present both at home and abroad between the deflection of measuring small size sample (gauge length section < 10mm) on the electronic universal tester mostly can only be with the testing machine lower and upper cross-member measured value of displacement replace.Yet; Because the structure interval of testing machine moving beam in the measuring process, chuck voussoir are inevitable with respect to the factors such as the degree of reliability of the slippage of collet body and chuck clamping sample; Make systematic error increase, and finally cause the measurement data precision to reduce and repeatability decline.
The utility model content
The purpose of the utility model is in order to remedy in the uniaxial tensile test deficiency that existing extensometer can't be measured apart from the deformation quantity of tensile sample (gauge length section < 10mm) small tenon; Provide a kind of small tenon to use extensometer apart from uniaxial tensile test; Make the lower limit of extensometer gage length scope reach 5mm, and make extensometer can directly monitor the distortion of small size sample gauge length section (< 10mm) thus.
To achieve these goals; Small tenon according to the utility model is used extensometer apart from uniaxial tensile test; Comprise that shell, flexible member, foil gauge, gag lever post transmit bar apart from bar, a pair of hook, a pair of blade and a pair of distortion, and assemble said a pair of blade, said a pair of hook and said a pair of distortion from inside to outside successively and transmit bar.
And each of said a pair of hook is provided with first groove in the outside, is used for installing distortion and transmits bar, and be provided with second groove in the inboard, is used to install blade.
And the spacing between said a pair of blade is more than or equal to 5mm, and less than 10mm.Preferably, the spacing between said a pair of blade is 5mm.
And said a pair of blade, said a pair of hook and said a pair of distortion are transmitted bar and are connected through screw.
According to the utility model, can make the measurement lower limit of extensometer reach 5mm, thereby solve the difficult problem that small size tensile sample (gauge length section < 10mm) deflection is accurately measured well.And from structure, the uniaxial tensile test of the utility model has carried out design again with extensometer to hook structure, and has adjusted the rigging position of hook and blade, and structure is comparatively simple; From measurement effect, only existing extensometer hook and blade position have been carried out corresponding adjustment, do not change the sensitivity of extensometer own, degree of accuracy and the linearity; From work flow, the processing of the hook of the utility model only need adopt conventional line to cut a kind of job operation can make finished product, and manufacturing process is short; Saw from manufacturing originally that the hook of the utility model made that the raw material materials are few, the source is wide, and manufacturing, assembly method are simple, so its low cost of manufacture.That is, the utlity model has beneficial effect simple in structure, respond well, easy to make, with low cost.
Description of drawings
Through describing below in conjunction with the exemplary accompanying drawing that an example is shown, above-mentioned and other purposes and the characteristics of the utility model will become apparent, wherein:
Fig. 1 for small tenon that the utility model provided apart from the assembling synoptic diagram of uniaxial tensile test with extensometer;
Fig. 2 a is the front view of the hook of the utility model;
Fig. 2 b is the vertical view of the hook of the utility model;
Fig. 2 c is the left view of the hook of the utility model;
Fig. 3 is the extensometer calibration curve according to the utility model;
Fig. 4 is the extensometer calibration error curve according to the utility model;
Fig. 5 a is the stretching full curve comparison diagram according to the test result of extensometer of the utility model and 25mm gauge length extensometer;
Fig. 5 b is according to the extensometer of the utility model test relative error distribution plan with respect to 25mm gauge length extensometer.
Main symbol description: 1 is that shell, 2 is that flexible member, 3 is that foil gauge, 4 is that spacing gauge length bar, 5 is that hook, 6 is that blade, 7 is to be out of shape the transmission bar.
Embodiment
Below, specify the embodiment of the utility model with reference to accompanying drawing.
As shown in Figure 1, comprise with extensometer apart from uniaxial tensile test according to the small tenon of the utility model: shell 1, flexible member 2, foil gauge 3, gag lever post transmit bar 7 apart from bar 4, hook 5, blade 6 and distortion.When measuring distortion; Extensometer is installed on tensile sample; Thereby blade 6 contacts the elongation of monitoring in the two cutting edge spacings with sample; Transmit bar 7 through distortion and make flexible member 2 produce strain, foil gauge 3 converts this strain into resistance change, utilizes suitable conversion and amplifying circuit resistance change to be converted into the voltage signal of variation again.Initial separation when extension test begins between the blade 6 is the extensometer gage length segment length.In the existing extensometer, arrange distortion transmission bar 7, blade 6 from inside to outside successively and link up with 5.For the lower limit with the extensometer gage length scope is extended to 5mm, the small tenon of the utility model apart from uniaxial tensile test with extensometer in, assemble blade 6, hook 5 and distortion from inside to outside successively and transmit bar 7.That is, as shown in Figure 1, arrange successively from inside to outside that at upside a blade 6,5 and distortion of a hook transmit bars 7, also be to arrange successively that from inside to outside a blade 6,5 and distortion of hook transmit bars 7 at downside.Because it is the most inboard that blade 6 is positioned at, therefore can dwindle the spacing between a pair of blade, make the initial separation between the blade 6 be reduced to 5mm.Thus, make the extensometer measurement lower limit after improving reach 5mm.
And, can come the further spacing between a pair of blade of regulation and control through the structure and the thickness of design hook 5.Fig. 2 a is the front view of the hook of the utility model, and Fig. 2 b is the vertical view of the hook of the utility model, and Fig. 2 c is the left view of the hook of the utility model, and other scantlings can be constant.Shown in Fig. 2 a to Fig. 2 c, the outside of hook 5 (position when referring to install is downside among Fig. 2 b) is provided with first groove 51, is used for installing distortion and transmits bar 7; The inboard of hook 5 (position when referring to install is upside among Fig. 2 b) is provided with second groove 52, is used to install blade 6.Thickness is used to regulate and control extensometer gage length between the groove 51 and 52.That is,, can regulate and control the spacing between said a pair of blade, thereby realize small tenon apart from the regulation and control of uniaxial tensile test with the extensometer measurement lower limit through designing the thickness between first groove 51 and second groove 52.According to the design of above-mentioned hook 5, can make the initial separation between the blade 6 be reduced to 5mm.Thus, make the extensometer measurement lower limit after improving reach 5mm.
And the central authorities of hook 5 are formed with two threaded holes 9, transmit bar 7 to connect blade 6, hook 5 and distortion through screw 8.Simultaneously, blade 6 transmits with distortion and also is formed with the hole that supplies screw 8 to pass on the bar 7.But the connected mode of blade 6, hook 5 and distortion transmission bar 7 is not limited to screw and is connected, and also can utilize bolt connection, rivet connection etc.
The small tenon of the utility model is the improvement that on the basis of existing extensometer, proposes hook structure and fit apart from uniaxial tensile test with extensometer, promptly through the assembling of the utility model hook, reaches small tenon is carried out extensometry apart from tensile sample.And the small tenon behind the remodeling all meets the GB12160-90 standard-required apart from uniaxial tensile test with extensometer indicating value degree of accuracy and error.
The small tenon of the utility model apart from uniaxial tensile test with extensometer after assembling, demarcate with the MTS calibration device.Demarcation segmentation in the rated displacement scope is carried out, and repeats three times, demarcate separately for preceding twice, then integral calibrating for the third time, the mean value of getting each section extensometer registration is determined the dependent variable of tensile sample.Set up the linear relationship between sample dependent variable (ε) and the given displacement of calibration device (f) with least square method then.Fig. 3 is the calibration curve of the utility model, and fit equation is: ε=0.20048f, linearly dependent coefficient 0.9999, the standard deviation of fit equation are 5.1 * 10
-5
Corresponding extensometer calibration error curve is as shown in Figure 4, can know that this utility model AME in calibration range is 0.00326, and the corresponding standard difference is 0.11004.The accuracy requirement that satisfied existing ASTME83 standard B-2 level of this grade of errors and ISO 9513 standards are 1 grade.
In addition, utilization the utility model is that the small size proportional test bar (K=5.65) of 0.5 * 1.5 * 5mm carries out the room temperature tensile performance test according to the following step to the gauge length section:
(1) in testing machine Control Software " choice of experimental conditions " interface, selecting the deformation measurement mode is extensometer, and according to the big or small selective amplifier decay shelves of measuring distortion, sets testing machine and load parameters such as tonnage, strain rate;
(2) the gauge length card being inserted into gag lever post transmits between the bar apart from bar and distortion;
(3) clamp the extensometer upper and lower end parts with two fingers, blade contacts with the sample marking distance section up and down, respectively the edge of a knife up and down of extensometer is fixed on the sample with rubber band;
(4) the extensometer signal shows zero clearing, and takes off the gauge length card;
(5) carry out the room temperature tensile test, record is also preserved experimental data.
Under the same strain rate conditions, same material Φ 5 standard proportional tensile samples are carried out the room temperature tensile test with conventional 25mm gauge length extensometer.The extensometer test result of its test result and the utility model is compared, and comparison result is shown in Fig. 5 a and Fig. 5 b.Fig. 5 a is a stretching full curve comparison result, and the extensometer and the conventional 25mm gauge length extensometer measurement result of visible the utility model begin to constriction stage degree of agreement higher at sample deformation.Difference of them increases gradually after the sample constriction, thereby this maybe be owing to cause concentration of plastic deformation degree difference to cause because of the sample sectional area is different.With 25mm extensometer test result is benchmark, and shown in Fig. 5 b, its average relative error value is 3.964% to the test relative error of the extensometer of the utility model with the distribution of strain registration before the sample surrender.
Corresponding tensile property test result is summarized in table 1, and the error range of the extensometer test result of the utility model satisfies GB/T 228-2002 requirement.
Table 1 room temperature tensile data
| The extensometer type | R P0.2(MPa) | A gt(%) | A t(%) | E(×10 2·GPa) |
| The 25mm gauge length | 775 | 2.5 | 14.5 | 1.542 |
| The utility model | 768 | 2.5 | 14.7 | 1.538 |
| Relative error (%) | -0.9(7MPa) | 0 | 1.4 | -0.3 |
The utility model is not limited to the foregoing description, under the situation that does not break away from the utility model scope, can carry out various distortion and modification.
Claims (7)
1. a small tenon is used extensometer apart from uniaxial tensile test; Comprise that shell, flexible member, foil gauge, gag lever post transmit bar apart from bar, a pair of hook, a pair of blade and a pair of distortion, it is characterized in that assembling successively from inside to outside said a pair of blade, said a pair of hook and said a pair of distortion and transmit bar.
2. small tenon according to claim 1 is used extensometer apart from uniaxial tensile test, and each that it is characterized in that said a pair of hook is provided with first groove in the outside, is used for installing distortion and transmits bar, and be provided with second groove in the inboard, is used to install blade.
3. small tenon according to claim 1 and 2 is used extensometer apart from uniaxial tensile test, it is characterized in that spacing between said a pair of blade more than or equal to 5mm, and less than 10mm.
4. small tenon according to claim 3 is used extensometer apart from uniaxial tensile test, it is characterized in that the spacing between said a pair of blade is 5mm.
5. small tenon according to claim 1 and 2 is used extensometer apart from uniaxial tensile test, it is characterized in that said a pair of blade, said a pair of hook and said a pair of distortion transmission bar connect through screw.
6. small tenon according to claim 3 is used extensometer apart from uniaxial tensile test, it is characterized in that said a pair of blade, said a pair of hook and said a pair of distortion transmission bar connect through screw.
7. small tenon according to claim 4 is used extensometer apart from uniaxial tensile test, it is characterized in that said a pair of blade, said a pair of hook and said a pair of distortion transmission bar connect through screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205754219U CN202533321U (en) | 2011-12-31 | 2011-12-31 | Short-scale distance extensometer for uniaxial tensile test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205754219U CN202533321U (en) | 2011-12-31 | 2011-12-31 | Short-scale distance extensometer for uniaxial tensile test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202533321U true CN202533321U (en) | 2012-11-14 |
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ID=47134497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205754219U Expired - Fee Related CN202533321U (en) | 2011-12-31 | 2011-12-31 | Short-scale distance extensometer for uniaxial tensile test |
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| Country | Link |
|---|---|
| CN (1) | CN202533321U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289980A (en) * | 2016-09-14 | 2017-01-04 | 西安交通大学 | Extensometer test system under liquid environment |
| CN107121278A (en) * | 2017-07-10 | 2017-09-01 | 内蒙金属材料研究所 | A kind of test device and method of testing for ensureing load test for fastener |
| CN109708608A (en) * | 2018-12-20 | 2019-05-03 | 南京航空航天大学 | A kind of adjustable clipping high-temperature extensometer of spacing |
-
2011
- 2011-12-31 CN CN2011205754219U patent/CN202533321U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289980A (en) * | 2016-09-14 | 2017-01-04 | 西安交通大学 | Extensometer test system under liquid environment |
| CN106289980B (en) * | 2016-09-14 | 2019-03-01 | 西安交通大学 | Extensometer test macro under liquid environment |
| CN107121278A (en) * | 2017-07-10 | 2017-09-01 | 内蒙金属材料研究所 | A kind of test device and method of testing for ensureing load test for fastener |
| CN109708608A (en) * | 2018-12-20 | 2019-05-03 | 南京航空航天大学 | A kind of adjustable clipping high-temperature extensometer of spacing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20141231 |
|
| EXPY | Termination of patent right or utility model |