CN113984497B - Device and method for measuring deformation between holes of composite material D-beam test piece - Google Patents
Device and method for measuring deformation between holes of composite material D-beam test piece Download PDFInfo
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- CN113984497B CN113984497B CN202111207228.4A CN202111207228A CN113984497B CN 113984497 B CN113984497 B CN 113984497B CN 202111207228 A CN202111207228 A CN 202111207228A CN 113984497 B CN113984497 B CN 113984497B
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- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 230000003068 static effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000011549 displacement method Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
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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
- G01N3/02—Details
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the technical field of composite material mechanical property testing, and relates to a device and a method for measuring deformation among holes of a composite material D-shaped beam test piece. The invention comprises a chuck, an upper mounting seat, a lower mounting seat, a gauge length adjusting assembly and a centering assembly. The invention ensures the centering precision of the upper and lower mounting seats through the matching of the linear sliding blocks and the guide rails, can be matched with a conventional COD extensometer or a longitudinal extensometer, can measure the deformation among holes of the D-shaped beam flat plate test piece with high precision and high reliability, and can be matched with four technical measures of the D-shaped beam flat plate test piece with various aperture sizes, thereby achieving the high-efficiency, high-reliability and high-precision measurement of the deformation among holes and rigidity measurement of the flat plate test piece. The invention can avoid the influence of the flexibility of the tester system on the testing result of the beam method, the measuring precision, accuracy and reliability of the device are far higher than those of the testing result of the beam displacement method, and the stability and efficiency are far higher than those of the testing result of the DIC method.
Description
Technical Field
The invention belongs to the technical field of composite material mechanical property testing, and relates to a device and a method for measuring deformation among holes of a composite material D-shaped beam test piece.
Background
After the composite material D-beam flat plate test piece is subjected to tensile-tensile fatigue tests under different load levels, rigidity measurement is required. At present, two main methods exist for measuring the deformation of a composite material D-shaped beam flat plate test piece, one is to consider the displacement of a cross beam of a test machine approximately as the deformation of the D-shaped beam flat plate test piece, but the deformation obtained by the method is larger and the measured rigidity is lower because the test machine has flexibility; the other is to use DIC technology, namely non-contact optical measurement technology, which has the defects of low precision, high requirement on test environment, high test result dispersibility and low data reliability. Therefore, a device and a method for measuring deformation among holes of a composite material D-beam flat plate test piece, which have higher precision and more stable data, are urgently needed.
Disclosure of Invention
The purpose of the invention is that: the device and the method for measuring the deformation between the holes of the composite material D-shaped beam flat plate test piece have higher precision and more stable data, and can meet the requirements of the deformation measurement and the rigidity measurement between the holes of the composite material D-shaped beam flat plate test piece.
The technical solution of the invention is as follows:
The device for measuring the deformation between holes of the composite material D-shaped beam test piece comprises a chuck, an upper mounting seat, a lower mounting seat, a gauge length adjusting assembly and a centering assembly: the clamping head comprises two U-shaped clamping blocks 1 and two pins 2, a test piece is respectively placed in the 2U-shaped clamping blocks 1, the 2 pins 2 respectively penetrate through the 2U-shaped clamping blocks 1 and the upper mounting seat and the lower mounting seat, and the 2 pins 2 are respectively fixed with the upper mounting seat and the lower mounting seat through jackscrews; one end of the gauge length adjusting assembly is connected with the upper mounting seat, and the other end of the gauge length adjusting assembly is connected with the lower mounting seat; the centering assembly comprises 2 linear sliders 10 and a guide rail 11; the 2 linear sliders 10 are respectively installed on the upper installation seat and the lower installation seat, and the guide rail 11 is installed in the upper linear slider 10 and the lower linear slider 10.
The upper mounting seat and the lower mounting seat comprise a base 3 and a reducing ring 4, and the reducing ring 4 is arranged in a round hole of the base 3; the pin 2 passes through the reducing ring 4, and the reducing ring 4 is in clearance fit with the base 3.
The gauge length adjusting assembly comprises an upper connecting rod 5, a lower connecting rod 6, a connecting rod sleeve 7, a locating pin 8 and a blade 9, wherein the upper connecting rod 5 is inserted into a round hole of the base 3 in the upper mounting seat, the blade 9 is fixed at the lower end of the upper connecting rod 5 and the upper end of the lower connecting rod 6, the lower connecting rod 6 penetrates through the connecting rod sleeve 7, and then the lower connecting rod 6 is inserted into the round hole of the base 3 in the lower mounting seat.
The base 3 of the upper mounting seat and the lower mounting seat is provided with a plurality of connecting rod positioning threaded holes 13, the gauge length adjusting assembly is fixed through jackscrews, and the positions of the connecting rods can be adjusted.
The connecting rod sleeve 7 is provided with a gauge length positioning hole 14, and the positioning pin 8 is inserted into the gauge length positioning hole 14.
The upper end surface and the lower end surface of the connecting rod sleeve 7 are provided with alignment scribing lines 15, the lower end of the upper connecting rod 5 and the upper end of the lower connecting rod 6 are provided with reference scribing lines 16, and the connecting rod sleeve 7 is rotated to align the alignment scribing lines 15 with the reference scribing lines 16.
The side of the connecting rod sleeve 7 is provided with an observation port 17.
The upper side and the lower side of the connecting rod sleeve 7 are respectively provided with a connecting rod sleeve locking threaded hole 18, and the connecting rod sleeve 7 is locked through bolts.
A method for measuring rigidity of a composite material D-beam flat plate test piece comprises the following specific steps:
1) Placing a composite material D-shaped beam test piece into the U-shaped clamping block 1, and then enabling the pin 2 to penetrate through round holes in the U-shaped clamping block and the sample;
2) The upper mounting seat and the lower mounting seat respectively penetrate through the upper pin 2 and the lower pin 2;
3) Two linear sliders 10 are respectively mounted on the upper mounting seat and the lower mounting seat;
4) Then the guide rail 11 passes through the upper linear slide block 10 and the lower linear slide block 10 and is fixed, then the upper mounting seat and the lower mounting seat are locked, and the guide rail 11 is taken down;
5) The method comprises the steps of installing a blade 9 at the lower end of an upper connecting rod 5 and the upper end of a lower connecting rod 6, inserting the lower connecting rod 6 into a round hole of a base 3 in a lower installation seat, adjusting the position of the lower connecting rod 6, fixing the lower connecting rod on the base 3 through jackscrews, enabling the lower connecting rod 6 to penetrate through a connecting rod sleeve 7, inserting the upper connecting rod 5 into the round hole of the base 3 in the upper installation seat, sliding the connecting rod sleeve 7 upwards between the upper connecting rod 5 and the lower connecting rod 6, inserting two positioning pins 8 into gauge positioning holes 14 of the connecting rod sleeve 7, adjusting the position of the connecting rod sleeve 7 until the upper end face of the lower connecting rod 6 contacts with the lower positioning pins 8, enabling the lower end face of the upper connecting rod 5 to contact with the upper positioning pins 8, rotating the connecting rod sleeve 7 and the upper connecting rod 5, enabling reference marks 16 on the lower connecting rod 6 and alignment marks 15 on the connecting rod sleeve 7 to be aligned, locking the upper connecting rod sleeve 7, finally taking down the two positioning pins 8, releasing the connecting rod sleeve 7 and placing the two positioning pins on the lower installation seat;
6) Installing a COD extensometer on the blade 9, and directly installing a longitudinal extensometer on the upper connecting rod 5 and the lower connecting rod 6;
7) Resetting displacement of the extensometer;
8) When the static stiffness is measured, a testing machine is started to load the test sample step by step, the loads of all levels and displacement data of the corresponding extensometer are recorded, and the stiffness of the composite material D-beam flat plate test piece under the loads of all levels is calculated by utilizing the loads of all levels and the corresponding Kong Jianwei displacement increment;
9) When the fatigue labor rigidity is measured, starting a testing machine to apply fatigue load to a sample and recording displacement data of an extensometer; and calculating the fatigue dynamic stiffness of the composite material D-beam flat plate test piece by using the fatigue load peaks, the fatigue load valleys and the corresponding displacement values.
If only static stiffness is measured, a longitudinal extensometer is selected, the longitudinal extensometer is directly arranged between the upper connecting rod 5 and the lower connecting rod 6 without the setting of the gauge length in the step 5.
The invention has the advantages and beneficial effects that
The invention provides a device and a method for measuring deformation among holes of a composite material D-shaped beam flat plate test piece, which can be used for measuring the deformation and the rigidity among holes of the composite material D-shaped beam flat plate test piece and are characterized in that: the centering precision of the upper mounting seat and the lower mounting seat can be ensured; the device can be matched with a conventional COD extensometer or a longitudinal extensometer and can be quickly and accurately matched with the gauge length of the COD extensometer; the deformation between holes of the D-beam flat plate test piece can be measured with high precision and high reliability; the D-beam flat plate test piece with various aperture sizes can be adapted.
The centering assembly consisting of the linear slide block and the guide rail is adopted to ensure the centering precision of the upper mounting seat and the lower mounting seat, so that the subsequent centering of the upper connecting rod and the lower connecting rod is ensured; the deformation between holes is measured by using a conventional COD extensometer or a longitudinal extensometer, and the gauge length adjusting assembly can be quickly and accurately adapted to the gauge length of the COD extensometer; the influence of the flexibility of the system of the testing machine on the testing result of the beam method is avoided, the measuring precision, accuracy and reliability of the device are far higher than those of the testing result of the beam displacement method, and the stability and efficiency are better than those of the testing result of the DIC method; the D-shaped beam flat plate test piece with various aperture sizes can be quickly adapted by replacing the reducing ring.
The invention solves the problems of poor accuracy in measuring the deformation and rigidity between holes of the D-beam flat plate test piece by adopting a beam displacement method, large dispersibility, poor reliability and low efficiency in measuring the deformation and rigidity data between holes by adopting a DIC method, and provides a device and a rigidity measuring method for measuring the deformation between holes of the D-beam flat plate test piece by adopting a conventional COD extensometer and a longitudinal extensometer. The device and the method are simple and easy to use, and can provide a quick, high-precision and high-reliability test solution for the composite material strength department.
Drawings
Fig. 1 is a three-dimensional view of the device of the present invention.
Fig. 2 is an enlarged view of the sleeve position of fig. 1.
Fig. 3 is a three-dimensional view of the hidden sleeve of fig. 2.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings. As shown in figures 1 to 3 of the drawings,
The device for measuring the deformation between holes of the composite material D-shaped beam test piece comprises a chuck, an upper mounting seat, a lower mounting seat, a gauge length adjusting assembly and a centering assembly: the clamping head comprises two U-shaped clamping blocks 1 and two pins 2, and test pieces are respectively placed in the 2U-shaped clamping blocks 1; the upper mounting seat and the lower mounting seat comprise a base 3 and a reducing ring 4, and the reducing ring 4 is arranged in a round hole of the base 3. The 2 pins 2 respectively penetrate through the 2U-shaped clamping blocks 1, the upper mounting seat and the lower mounting seat, the 2 pins 2 are respectively fixed with the upper mounting seat and the lower mounting seat through jackscrews, a plurality of connecting rod positioning threaded holes 13 are formed in a base 3 of the upper mounting seat and the lower mounting seat, and after the positions of the connecting rods are adjusted, the gauge length adjusting assembly is fixed through jackscrews; the gauge length adjusting assembly comprises an upper connecting rod 5, a lower connecting rod 6, a connecting rod sleeve 7, a locating pin 8 and a blade 9, wherein the upper connecting rod 5 is inserted into a round hole of the base 3 in the upper mounting seat, the blade 9 is fixed at the lower end of the upper connecting rod 5 and the upper end of the lower connecting rod 6, the lower connecting rod 6 penetrates through the connecting rod sleeve 7, and then the lower connecting rod 6 is inserted into the round hole of the base 3 in the lower mounting seat. The connecting rod sleeve 7 is provided with a gauge length positioning hole 14, and the positioning pin 8 is inserted into the gauge length positioning hole 14. The upper end surface and the lower end surface of the connecting rod sleeve 7 are provided with alignment scribing lines 15, the lower end of the upper connecting rod 5 and the upper end of the lower connecting rod 6 are provided with reference scribing lines 16, and the connecting rod sleeve 7 is rotated to align the alignment scribing lines 15 with the reference scribing lines 16. The side surface of the connecting rod sleeve 7 is provided with an observation port 17, and the alignment condition of the upper connecting rod 5 and the lower connecting rod 6 in the connecting rod sleeve 7 is observed through the observation port 17. The upper side and the lower side of the connecting rod sleeve 7 are respectively provided with a connecting rod sleeve locking threaded hole 18, and the connecting rod sleeve 7 is locked through bolts; the centering assembly comprises 2 linear sliders 10 and a guide rail 11; the 2 linear sliders 10 are respectively installed on the upper installation seat and the lower installation seat, and the guide rail 11 is installed in the upper linear slider 10 and the lower linear slider 10.
A method for measuring rigidity of a composite material D-beam flat plate test piece comprises the following specific steps:
1) Placing a composite material D-shaped beam test piece into the U-shaped clamping block 1, and then enabling the pin 2 to penetrate through round holes in the U-shaped clamping block and the sample;
2) The upper mounting seat and the lower mounting seat respectively penetrate through the upper pin 2 and the lower pin 2;
3) Two linear sliders 10 are respectively mounted on the upper mounting seat and the lower mounting seat;
4) Then the guide rail 11 passes through the upper linear slide block 10 and the lower linear slide block 10 and is fixed, then the upper mounting seat and the lower mounting seat are locked, and the guide rail 11 is taken down;
5) The method comprises the steps of installing a blade 9 at the lower end of an upper connecting rod 5 and the upper end of a lower connecting rod 6, inserting the lower connecting rod 6 into a round hole of a base 3 in a lower installation seat, adjusting the position of the lower connecting rod 6, fixing the lower connecting rod on the base 3 through jackscrews, enabling the lower connecting rod 6 to penetrate through a connecting rod sleeve 7, inserting the upper connecting rod 5 into the round hole of the base 3 in the upper installation seat, sliding the connecting rod sleeve 7 upwards between the upper connecting rod 5 and the lower connecting rod 6, inserting two positioning pins 8 into gauge positioning holes 14 of the connecting rod sleeve 7, adjusting the position of the connecting rod sleeve 7 until the upper end face of the lower connecting rod 6 contacts with the lower positioning pins 8, enabling the lower end face of the upper connecting rod 5 to contact with the upper positioning pins 8, rotating the connecting rod sleeve 7 and the upper connecting rod 5, enabling reference marks 16 on the lower connecting rod 6 and alignment marks 15 on the connecting rod sleeve 7 to be aligned, locking the upper connecting rod sleeve 7, finally taking down the two positioning pins 8, releasing the connecting rod sleeve 7 and placing the two positioning pins on the lower installation seat;
6) Installing a COD extensometer on the blade 9, and directly installing a longitudinal extensometer on the upper connecting rod 5 and the lower connecting rod 6;
7) Resetting displacement of the extensometer;
8) When the static stiffness is measured, a testing machine is started to load the test sample step by step, the loads of all levels and displacement data of the corresponding extensometer are recorded, and the stiffness of the composite material D-beam flat plate test piece under the loads of all levels is calculated by utilizing the loads of all levels and the corresponding Kong Jianwei displacement increment;
9) When the fatigue labor rigidity is measured, starting a testing machine to apply fatigue load to a sample and recording displacement data of an extensometer; and calculating the fatigue dynamic stiffness of the composite material D-beam flat plate test piece by using the fatigue load peaks, the fatigue load valleys and the corresponding displacement values.
If only static stiffness is measured, a longitudinal extensometer is selected, the longitudinal extensometer is directly arranged between the upper connecting rod 5 and the lower connecting rod 6 without the setting of the gauge length in the step 5.
Claims (6)
1. A deformation measuring device between combined material D roof beam test piece hole, characterized by: the device comprises a chuck, an upper mounting seat, a lower mounting seat, a gauge length adjusting assembly and a centering assembly: the clamping head comprises two U-shaped clamping blocks (1) and two pins (2), a test piece is respectively placed in the 2U-shaped clamping blocks (1), the 2 pins (2) respectively penetrate through the 2U-shaped clamping blocks (1) and the upper mounting seat and the lower mounting seat, and the 2 pins (2) are respectively fixed with the upper mounting seat and the lower mounting seat through jackscrews; one end of the gauge length adjusting assembly is connected with the upper mounting seat, and the other end of the gauge length adjusting assembly is connected with the lower mounting seat; the centering assembly comprises 2 linear sliders (10) and guide rails (11); the 2 linear sliding blocks (10) are respectively arranged on the upper mounting seat and the lower mounting seat, and the guide rail (11) is arranged in the upper linear sliding block (10) and the lower linear sliding block (10);
The upper mounting seat and the lower mounting seat comprise a base (3) and a reducing ring (4), and the reducing ring (4) is arranged in a round hole of the base (3); the pin (2) passes through the reducing ring (4), and the reducing ring (4) is in clearance fit with the base (3);
The gauge length adjusting assembly comprises an upper connecting rod (5), a lower connecting rod (6), a connecting rod sleeve (7), a locating pin (8) and a blade (9), wherein the upper connecting rod (5) is inserted into a round hole of a base (3) in an upper mounting seat, the blade (9) is fixed at the lower end of the upper connecting rod (5) and the upper end of the lower connecting rod (6), the lower connecting rod (6) penetrates through the connecting rod sleeve (7), and then the lower connecting rod (6) is inserted into the round hole of the base (3) in the lower mounting seat;
the connecting rod sleeve (7) is provided with a gauge length positioning hole (14), and the positioning pin (8) is inserted into the gauge length positioning hole (14);
The upper end face and the lower end face of the connecting rod sleeve (7) are provided with alignment scribing lines (15), the lower end of the upper connecting rod (5) and the upper end of the lower connecting rod (6) are provided with reference scribing lines (16), and the connecting rod sleeve (7) is rotated to align the alignment scribing lines (15) with the reference scribing lines (16).
2. The composite material D-beam test piece inter-hole deformation measuring device according to claim 1, characterized in that: the base (3) of the upper mounting seat and the lower mounting seat is provided with a plurality of connecting rod positioning threaded holes (13), the gauge length adjusting assembly is fixed through jackscrews, and the positions of the upper connecting rod (5) and the lower connecting rod (6) can be adjusted.
3. The composite material D-beam test piece inter-hole deformation measuring device according to claim 1, characterized in that: the side surface of the connecting rod sleeve (7) is provided with an observation port (17).
4. The composite material D-beam test piece inter-hole deformation measuring device according to claim 1, characterized in that: the upper side and the lower side of the connecting rod sleeve (7) are respectively provided with a connecting rod sleeve locking threaded hole (18), and the connecting rod sleeve (7) is locked through bolts.
5. A rigidity measuring method of a composite material D-beam flat plate test piece is characterized by comprising the following steps: use of a device for measuring deformation between holes of a composite material D-beam test piece according to any one of claims 1-4, comprising the following steps:
1) Placing a composite material D-shaped beam test piece into the U-shaped clamping block (1), and then enabling the pin (2) to penetrate through round holes in the U-shaped clamping block and the sample;
2) The upper mounting seat and the lower mounting seat respectively penetrate through the upper pin (2) and the lower pin (2);
3) Two linear sliding blocks (10) are respectively arranged on the upper mounting seat and the lower mounting seat;
4) Then the guide rail (11) passes through the upper linear slide block (10) and the lower linear slide block (10) and is fixed, then the upper mounting seat and the lower mounting seat are locked, and the guide rail (11) is taken down;
5) The method comprises the steps of installing a blade (9) at the lower end of an upper connecting rod (5) and the upper end of a lower connecting rod (6), inserting the lower connecting rod (6) into a round hole of a base (3) in a lower mounting seat, adjusting the position of the lower connecting rod (6) and fixing the lower connecting rod on the base (3) through jackscrews, enabling the lower connecting rod (6) to penetrate through a connecting rod sleeve (7), inserting the upper connecting rod (5) into the round hole of the base (3) in the upper mounting seat, sliding the connecting rod sleeve (7) upwards between the upper connecting rod (5) and the lower connecting rod (6), inserting two positioning pins (8) into gauge length positioning holes (14) of the connecting rod sleeve (7), adjusting the position of the connecting rod sleeve (7) until the upper end face of the lower connecting rod (6) contacts with the lower positioning pin (8), rotating the sleeve (7) and the upper connecting rod (5), enabling a reference score line (16) on the lower connecting rod (6) and an alignment score line (15) on the upper connecting rod sleeve (7) to be aligned, and finally, unlocking the two connecting rod sleeves (7) and finally placing the two connecting rod sleeves (8) on the upper connecting rod sleeve (5);
6) Installing a COD extensometer on the blade (9);
7) Zero clearing of displacement of the COD extensometer;
8) When the static stiffness is measured, a testing machine is started to load the test sample step by step, the load of each level and the displacement data of the corresponding COD extensometer are recorded, and the stiffness of the composite material D-beam flat plate test piece under the load of each level is calculated by utilizing the load of each level and the corresponding Kong Jianwei displacement increment;
9) When the fatigue labor rigidity is measured, starting a testing machine to apply fatigue load to a sample and recording displacement data of the COD extensometer; and calculating the fatigue dynamic stiffness of the composite material D-beam flat plate test piece by using the fatigue load peaks, the fatigue load valleys and the corresponding displacement values.
6. The method for measuring the rigidity of the composite material D-beam flat plate test piece according to claim 5, which is characterized by comprising the following steps: if only static rigidity is measured, the longitudinal extensometer is selected, the gauge length setting in the step 5) is not needed, and the longitudinal extensometer is directly arranged between the upper connecting rod (5) and the lower connecting rod (6).
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| CN202111207228.4A CN113984497B (en) | 2021-10-15 | 2021-10-15 | Device and method for measuring deformation between holes of composite material D-beam test piece |
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| CN202111207228.4A CN113984497B (en) | 2021-10-15 | 2021-10-15 | Device and method for measuring deformation between holes of composite material D-beam test piece |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102830012A (en) * | 2012-07-30 | 2012-12-19 | 国核宝钛锆业股份公司 | Clamping control device for foil strip high-temperature tensile test |
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| CN201331477Y (en) * | 2009-01-09 | 2009-10-21 | 陈红秋 | Test device of enlarging test range of the extensometer |
| US9733172B2 (en) * | 2014-05-23 | 2017-08-15 | The Boeing Company | Universal grip system |
| CN105352792A (en) * | 2015-12-13 | 2016-02-24 | 中国飞机强度研究所 | Single-bolt double-shear squeezing test device for laminated composite plate |
| CN108592746A (en) * | 2018-06-26 | 2018-09-28 | 中信戴卡股份有限公司 | A kind of sample marking distance and length-measuring appliance of having no progeny |
| CN109974657A (en) * | 2019-04-03 | 2019-07-05 | 威海汇智机电科技有限公司 | A kind of connecting device for sensor and average value extensometer of average value extensometer |
| CN113237739B (en) * | 2021-04-09 | 2022-06-14 | 大连理工大学 | Continuous tension and compression test fixture for measuring Baoxing behavior |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830012A (en) * | 2012-07-30 | 2012-12-19 | 国核宝钛锆业股份公司 | Clamping control device for foil strip high-temperature tensile test |
Non-Patent Citations (1)
| Title |
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| 引伸计的测量原理及其改进方法;李演楷等;工程与试验;20100930;第50卷(第3期);64-74 * |
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