CN113075030A - Clamp device for DIC (digital image conversion) measurement of strain in plate surface of plate - Google Patents
Clamp device for DIC (digital image conversion) measurement of strain in plate surface of plate Download PDFInfo
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- CN113075030A CN113075030A CN202010004959.8A CN202010004959A CN113075030A CN 113075030 A CN113075030 A CN 113075030A CN 202010004959 A CN202010004959 A CN 202010004959A CN 113075030 A CN113075030 A CN 113075030A
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- strain
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- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 title description 2
- 230000007246 mechanism Effects 0.000 claims abstract description 69
- 238000007906 compression Methods 0.000 claims abstract description 32
- 230000000007 visual effect Effects 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims description 21
- 238000012360 testing method Methods 0.000 claims description 21
- 230000000694 effects Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000012800 visualization Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 31
- 238000012669 compression test Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Images
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
- G01N3/02—Details
- G01N3/04—Chucks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
-
- 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
- G01N3/06—Special adaptations of indicating or recording means
-
- 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
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0085—Compressibility
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- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- 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
-
- 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
-
- 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
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
A clamp device for DIC measurement of strain in panel surface comprises: accent power splint mechanism, accent position splint mechanism and centre gripping handle mechanism with visual window, wherein: the positioning clamping plate mechanisms are arranged at two ends of the force-adjusting clamping plate mechanism, the clamping handle mechanisms are arranged at two ends of the positioning clamping plate mechanism, and the three mechanisms are fixed in sequence to prevent the plate from being bent in the normal direction; the invention ensures the visualization of the front surface of the sample while applying pressure to the front surface of the sample, adjusts the pressure numerical value, and can measure the two-way strain by adopting DIC. In addition, a movable clamp and a movable clamping handle were provided to measure the stress-strain curve of the tensile-compression cycle.
Description
Technical Field
The invention relates to a technology in the field of mechanical property testing of metal plates, in particular to a clamp device for DIC (digital image computer) measurement of strain in a plate surface of a plate.
Background
In conducting a compression test for studying anisotropy of a plate material, a hydraulic or pneumatic driven structure is generally used to apply pressure to restrain the plate material from bending in the normal direction. Because the front of the sample is shielded, the strain in the length direction and the thickness direction of the sample can be measured only from the side direction, the strain in the thickness direction is small, the measurement precision is poor, and the strain in the width direction can be calculated only by using the volume invariant principle, so the precision is poor. The lateral direction and the normal direction of the traditional pressure shear test sample are shielded simultaneously, and the shear strain cannot be measured. The normal force applied by conventional clamping devices is fixed and it is difficult to adjust the normal clamping force independently from the actual requirements depending on the sample material. The present invention has been made to solve such problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the clamp device for DIC measurement of the strain in the plate surface of the plate, which can realize the DIC measurement of the strain in the plate surface in unidirectional compression, compression shear or tension and compression circulation of the plate.
The invention is realized by the following technical scheme:
the invention comprises the following steps: accent power splint mechanism, accent position splint mechanism and centre gripping handle mechanism with visual window, wherein: the position-adjusting clamping plate mechanisms are arranged at two ends of the force-adjusting clamping plate mechanism, the clamping handle mechanisms are arranged at two ends of the position-adjusting clamping plate mechanism, and the three mechanisms are sequentially fixed to prevent the plate from being bent in a normal direction.
The force-adjusting clamping plate mechanism comprises: upper plate, lower plate, transparent splint, the bolt and the nut that have the spring, wherein: transparent splint inlay in the visual window of punch holder, adjust the packing force through the bolt that has the spring and nut cooperation between punch holder and the lower plate.
The position-adjusting clamping plate mechanism comprises: set up respectively in the mounting fixture and the movable clamp at accent power splint mechanism both ends to and corresponding mounting fixture and movable clamp plate, wherein: the sizes of the movable clamp and the movable clamping plate are respectively larger than those of the fixed clamp and the fixed clamping plate.
The clamping handle mechanism comprises: set up fixed centre gripping handle on mounting fixture and set up activity centre gripping handle on movable fixture, the class forked tail splint that have the bolt, wherein: the class forked tail splint pass through the relative height of bolt adjustment and centre gripping handle in order to satisfy the sample requirement of different thickness, and activity centre gripping handle is greater than fixed centre gripping handle and fixed class forked tail splint respectively with the size of activity forked tail splint.
Technical effects
The invention integrally solves the problems of inconvenient strain measurement or low measurement precision caused by the fixture adopted in the traditional compression or compression-shear type experiment.
Compared with the prior art, the non-contact strain measurement device is provided with the visual window, and DIC can be used for non-contact strain measurement; a force-adjusting clamping plate mechanism is arranged, a spring is used for applying a normal force, and the magnitude of the normal force is adjustable; the device is connected to the testing machine and is linked with the testing machine and the sample, so that the device is convenient to install and high in precision; the invention ensures the visualization of the front surface of the sample while applying pressure to the front surface of the sample, adjusts the pressure numerical value, and can measure the two-way strain by adopting DIC. In addition, a movable clamp and a movable clamping handle were provided to measure the stress-strain curve of the tensile-compression cycle.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the shape of a sample;
FIG. 3 is a schematic structural view of the force-adjusting clamping mechanism;
FIG. 4 is a schematic view of the connection of the upper clamping plate and the transparent clamping plate;
FIG. 5 is a schematic view of the movable clamp attached to a test specimen;
FIG. 6 is a schematic view of the attachment of a holding fixture to a test sample;
FIG. 7 is a schematic view of a one-sided force-adjusting clamp mechanism, a position-adjusting clamp mechanism, and a clamping bar mechanism;
FIG. 8 is a schematic view of a stationary clamp bar;
FIG. 9 is a schematic view of a movable clamp handle;
in the figure: the device comprises a force-adjusting clamping plate mechanism A, a position-adjusting clamping plate mechanism B, a clamping handle mechanism C, a sample D, an upper clamping plate 1, a lower clamping plate 2, a transparent clamping plate 3, a spring 4, a first bolt 5, a nut 6, a screw 7, a fixing clamp 8, a movable clamp 9, a fixing clamping plate 10, a movable clamping plate 11, a fixing clamping handle 12, a movable clamping handle 13, a cylindrical pin 14, a connecting shaft 15, a limiting pin 16, a sleeve 17, a second bolt 18 and a dovetail-like clamping plate 19.
Detailed Description
As shown in fig. 1 and 2, the present embodiment includes: accent power splint mechanism A, accent position splint mechanism B and centre gripping handle mechanism C with visual window, wherein: the position-adjusting clamping plate mechanism B is arranged at two ends of the force-adjusting clamping plate mechanism A, the clamping handle mechanism C is arranged at two ends of the position-adjusting clamping plate mechanism B, and the three are sequentially fixed to prevent the normal bending of the sample D.
As shown in fig. 3 and 4, the force-adjusting clamping mechanism a includes: upper plate 1, lower plate 2, transparent splint 3, first bolt 5 and nut 6 with spring 4, wherein: the transparent clamping plate 3 is embedded in a visible window of the upper clamping plate 1 through a screw 7, and the pressing force between the upper clamping plate 1 and the lower clamping plate 2 is adjusted through the matching of a first bolt 5 with a spring 4 and a nut 6.
The visual window is embedded into the transparent clamping plate 3, so that the front side of the sample can be observed in real time in the experiment process, and non-contact strain measurement can be carried out.
The pressing force is adjusted by the following steps: the amount of compression of the spring is controlled by adjusting the screwing amount of the first bolt 5, and the normal pressure is adjusted according to actual requirements.
The upper splint 1 and the lower splint 2 are I-shaped and made of the same material.
And a step is arranged between the upper clamping plate 1 and the transparent clamping plate 3 for positioning, and the height of the step is the same as the thickness of the transparent clamping plate 3.
As shown in fig. 5 and 6, the positioning clamping plate mechanism B includes: the fixed clamp 8 and the movable clamp 9 are respectively arranged at two ends of the force-adjusting clamping plate mechanism A, and the fixed clamping plate 10 and the movable clamping plate 11 are respectively arranged at two ends of the force-adjusting clamping plate mechanism A.
The movable clamp 9 is provided with a sliding groove, and the size of the sliding groove is larger than that of the fixed clamp 8; the movable clamping plate 11 is provided with a sliding groove, and the size of the sliding groove is larger than that of the fixed clamping plate 10.
The movable clamp 9 and the movable clamp plate 11 are provided with sliding grooves specially for compression experiments, and the sliding grooves are matched with the end parts of the upper clamp plate 1 and the lower clamp plate 2 of the force adjusting mechanism to play a role in guiding and limiting.
As shown in fig. 7 to 9, the grip mechanism C includes: the fixed clamping shank 12 and the movable clamping shank 13, the dovetail-like clamping plate 19 with the second bolt 18 and the cylindrical pin 14, wherein: the cylindric lock 14 sets up in class forked tail splint 19's pinhole in order to be connected sample D and anchor clamps and centre gripping handle fixed connection, and class forked tail splint 19 adjusts the sample D requirement with the satisfied different thickness with the relative height of centre gripping handle through second bolt 18.
The second bolt 18 is provided with a sleeve 17.
The clamping handle is externally connected with equipment through a connecting shaft 15 and is provided with a limiting pin 16 for preventing movement.
The device is compressed or pressed and sheared by the following modes: the test sample D is arranged between the upper clamping plate 1 and the lower clamping plate 2, the compression amount of the spring 4 is calculated according to the pressure value required by the test sample D, and the first bolt 5 with the spring 4 and the nut 6 are assembled according to the compression amount of the spring 4; a fixed positioning clamping plate mechanism movable fixed clamp 8 and a movable clamp 9 of the positioning clamping plate mechanism B, and a fixed clamping plate 10 and a movable clamping plate 11 are respectively embedded with the end parts of the corresponding upper clamping plate 1 and the lower clamping plate 2 and are fixed by screws 7; the cylindrical pin 14 fixedly connects the sample D, the force-adjusting clamping mechanism A, the position-adjusting clamping mechanism B and the clamping handle mechanism C; the fixed clamping handle 12 is externally connected with the end face of the testing machine through a connecting shaft 15, and the crossbeam of the testing machine is connected with the movable clamping handle 13. After the device is assembled and the sample D is clamped, the crossbeam of the testing machine moves downwards to drive the movable clamping handle 13 to move downwards, the movable clamping handle 13 drives the movable clamp 9 to move downwards along the sliding groove, and the sample D clamped by the movable clamp 9 moves downwards along with the movable clamp and is compressed. In the compression process, the normal direction of the main deformation area on the front surface of the sample D is restrained by applying pressure by the force-adjusting clamping plate mechanism A, and the two ends on the front surface of the sample D are clamped and restrained by the position-adjusting clamping plate mechanism B and the clamping handle mechanism C, so that normal bending is avoided in the compression process of the sample D. The strain of the sample D is collected by an optical strain measuring system, and the stress is read from the testing machine.
The device carries out tension-compression cyclic loading in the following mode: and after the device is assembled and the sample D is clamped, stretching is carried out. Since the specimen D was hardly bent in the normal direction of the front surface when stretched, a small pressure value was set. The crossbeam of the testing machine moves upwards to drive the movable clamping handle 13 to move upwards, the movable clamp 9 clamped by the movable clamping handle 13 moves upwards along the sliding groove, and the sample D clamped by the movable clamp 9 is driven to move downwards to stretch the sample D. After the stretching is finished, compression preparation is carried out, the pressure value is increased to prevent the normal bending of the front surface of the sample D in the compression process, then the compression process is carried out, the strain of the sample D is collected by an optical strain measurement system, and the stress is read from the testing machine.
Compared with the prior art, the device can adopt DIC to measure the strain, and the strain in multiple directions can be measured. Taking the width direction as an example, the strain in the width direction obtained by using the device has more accurate degree than that of the traditional compression type clamp.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. The utility model provides a clamp device that strain DIC measured in face of panel which characterized in that includes: accent power splint mechanism, accent position splint mechanism and centre gripping handle mechanism with visual window, wherein: the positioning clamping plate mechanisms are arranged at two ends of the force-adjusting clamping plate mechanism, the clamping handle mechanisms are arranged at two ends of the positioning clamping plate mechanism, and the three mechanisms are fixed in sequence to prevent the plate from being bent in the normal direction;
the force-adjusting clamping plate mechanism comprises: upper plate, lower plate, transparent splint, the bolt and the nut that have the spring, wherein: transparent splint inlay in the visual window of punch holder so that the in-process sample that the experiment goes on the front alright observe in real time, adjust the packing force through the bolt that has the spring and nut cooperation between punch holder and the lower plate, adjust the screw amount control spring compression capacity of first bolt promptly and then adjust the size of normal pressure according to actual demand.
2. The clamp apparatus for DIC measurement of strain in the sheet metal object of claim 1 wherein said upper and lower clamp plates are i-shaped and of the same material.
3. The clamp device for DIC measurement of strain in panel surface according to claim 1 or 2, wherein a step is provided between the upper clamp plate and the transparent clamp plate for positioning, and the height of the step is the same as the thickness of the transparent clamp plate.
4. The clamp apparatus for DIC measurement of in-plane strain of sheet material as claimed in claim 1 wherein said positioning clamp mechanism comprises: set up respectively in the mounting fixture and the movable clamp at accent power splint mechanism both ends to and corresponding mounting fixture and movable clamp plate, wherein: the sizes of the movable clamp and the movable clamping plate are respectively larger than those of the fixed clamp and the fixed clamping plate.
5. The clamp device for DIC measurement of the strain in the plate surface of the plate as claimed in claim 4, wherein the movable clamping plate and the movable clamp are provided with sliding grooves for compression experiments, and the sliding grooves are matched with the end parts of the upper clamping plate and the lower clamping plate to play a role in guiding and limiting.
6. The clamp apparatus for DIC measurement of in-plane strain of sheet material as claimed in claim 1 wherein said clamping lever mechanism comprises: fixed centre gripping handle and activity centre gripping handle, the class forked tail splint and the cylindric lock that have the second bolt, wherein: the cylindric lock sets up in the pinhole of class forked tail splint in order to with sample and anchor clamps and centre gripping handle fixed connection, class forked tail splint pass through the second bolt adjust with the sample requirement of the relative height of centre gripping handle in order to satisfy different thickness.
7. The clamp device for DIC measurement of strain in sheet material as claimed in claim 6, wherein the clamping handle is connected to the external device through a connecting shaft and is provided with a stop pin for preventing movement.
8. The apparatus of claim 1 wherein the transparent clamping plate has a groove with a width less than the width of the gauge length of the sample to avoid the sample rubbing against the transparent clamping plate to affect the accuracy.
9. The clamp device for DIC measurement of strain in sheet material as claimed in claim 1, wherein the DIC measurement of strain comprises cyclic loading of compression or compression shear and tension and compression;
the compression or compression shear means that: the test sample is arranged between the upper clamping plate and the lower clamping plate, the compression amount of the spring is calculated according to the pressure value required by the test sample, and the first bolt with the spring and the nut are assembled according to the compression amount of the spring; the fixed positioning clamping plate mechanism of the positioning clamping plate mechanism is movably provided with a fixed clamp and a movable clamp, and the fixed clamping plate and the movable clamping plate are respectively embedded with the end parts of the corresponding upper clamping plate and the lower clamping plate and are fixed by screws; the cylindrical pin fixedly connects the sample, the force-adjusting clamping mechanism, the position-adjusting clamping mechanism and the clamping handle mechanism; the fixed clamping handle is externally connected with the end face of the testing machine through a connecting shaft, a crossbeam of the testing machine is connected with the movable clamping handle, the device is assembled and the sample is clamped, the crossbeam of the testing machine moves downwards to drive the movable clamping handle to move downwards, the movable clamping handle drives the movable clamp to move downwards along the sliding chute, the sample clamped by the movable clamp moves downwards along with the movable clamp and is compressed, the normal direction of a main deformation area on the front surface of the sample is restrained by applying pressure by a force adjusting clamping plate mechanism in the compression process, the two ends on the front surface of the sample are restrained by clamping by a positioning clamping plate mechanism and a clamping handle mechanism, the normal bending is prevented in the sample compression process, the strain of the sample is;
the tension and compression cyclic loading: the device assembly finishes with the sample centre gripping, stretch, because the positive normal direction of sample is hardly crooked when tensile, the event sets up less pressure value, the testing machine crossbeam moves up, it shifts up to drive the activity centre gripping handle, the tight movable fixture of activity centre gripping handle clamp shifts up along the spout, it shifts down thereupon and carries out the tensile of sample to drive the tight sample of activity anchor clamps clamp, after tensile, carry out the compression preparation, increase the pressure value in order to prevent the positive normal direction of sample bending in the compression process, carry out foretell compression process again, the sample meets an emergency and adopts optical strain measurement system to gather, stress then reads from the testing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010004959.8A CN113075030A (en) | 2020-01-03 | 2020-01-03 | Clamp device for DIC (digital image conversion) measurement of strain in plate surface of plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010004959.8A CN113075030A (en) | 2020-01-03 | 2020-01-03 | Clamp device for DIC (digital image conversion) measurement of strain in plate surface of plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113075030A true CN113075030A (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010004959.8A Pending CN113075030A (en) | 2020-01-03 | 2020-01-03 | Clamp device for DIC (digital image conversion) measurement of strain in plate surface of plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113075030A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080184807A1 (en) * | 2007-02-02 | 2008-08-07 | Nitto Denko Corporation | Compression test apparatus |
| CN102305745A (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | Differential-interference-contrast (DIC)-technology-based sheet metal forming performance testing device |
| CN103712854A (en) * | 2014-01-06 | 2014-04-09 | 西南交通大学 | Multifunctional material test clamp based on lever principle |
| CA2847859A1 (en) * | 2013-06-03 | 2014-12-03 | The Boeing Company | Apparatus and method for load testing a coupon |
| CN105203394A (en) * | 2015-09-21 | 2015-12-30 | 上海交通大学 | Device for measuring sheet metal stress-strain curve |
| CN106323748A (en) * | 2016-08-29 | 2017-01-11 | 北京航空航天大学 | Non-contact video measuring system for strain measurement and mechanical property characterization of carbon fiber multifilament |
| CN106353181A (en) * | 2016-09-09 | 2017-01-25 | 西北工业大学 | Asymmetric clamping device and experimental method for sheet compressing |
-
2020
- 2020-01-03 CN CN202010004959.8A patent/CN113075030A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080184807A1 (en) * | 2007-02-02 | 2008-08-07 | Nitto Denko Corporation | Compression test apparatus |
| CN102305745A (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | Differential-interference-contrast (DIC)-technology-based sheet metal forming performance testing device |
| CA2847859A1 (en) * | 2013-06-03 | 2014-12-03 | The Boeing Company | Apparatus and method for load testing a coupon |
| CN103712854A (en) * | 2014-01-06 | 2014-04-09 | 西南交通大学 | Multifunctional material test clamp based on lever principle |
| CN105203394A (en) * | 2015-09-21 | 2015-12-30 | 上海交通大学 | Device for measuring sheet metal stress-strain curve |
| CN106323748A (en) * | 2016-08-29 | 2017-01-11 | 北京航空航天大学 | Non-contact video measuring system for strain measurement and mechanical property characterization of carbon fiber multifilament |
| CN106353181A (en) * | 2016-09-09 | 2017-01-25 | 西北工业大学 | Asymmetric clamping device and experimental method for sheet compressing |
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Application publication date: 20210706 |