CN110375638A - A kind of radial deformation measuring device based on LVDT sensor - Google Patents
A kind of radial deformation measuring device based on LVDT sensor Download PDFInfo
- Publication number
- CN110375638A CN110375638A CN201910802322.0A CN201910802322A CN110375638A CN 110375638 A CN110375638 A CN 110375638A CN 201910802322 A CN201910802322 A CN 201910802322A CN 110375638 A CN110375638 A CN 110375638A
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- CN
- China
- Prior art keywords
- lvdt
- auxiliary mould
- iron wire
- sensor
- radial deformation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 9
- 239000002360 explosive Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/12—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of radial deformation measuring devices based on LVDT sensor, including auxiliary mould and sensor device, the sensor device includes flexible iron wire, LVDT coil, LVDT iron core, spring and bolt, sample is fixed between flexible iron wire and auxiliary mould, one end connection bolt of flexible iron wire and the side for being fixed on auxiliary mould, the other end of flexible iron wire is successively connected with spring and LVDT iron core, and it is inserted through LVDT coil, the LVDT coil is fixed on the other side of the auxiliary mould.Device assembly is simple, can effectively amplify radial deformation numerical value, improves measurement accuracy, its hoop strain is measured in the case where not influencing explosive test.
Description
Technical field
The present invention relates to material mechanical performance technical fields, and in particular to a kind of radial deformation survey based on LVDT sensor
Measure device.
Background technique
In material mechanical performance test, including stretching, compression, confining pressure stretching, hydrostatic compression etc., it needs accurately to measure its axis
To and radial deformation, with accurate evaluation material mechanical performance and construct mechanical model, the measurement of radial deformation be measurement explosive
One important test content of mechanical property.Relative to axial deformation, radial deformation test due to gauge length section is small, deformation it is small etc. because
Element is difficult to accurately measure.Existing radial direction test method is divided into three kinds, first is that being measured based on foil gauge, but its acquisition is a little
It strains and not global mean strain, there are biggish singularitys；Second is that measuring test process pilot scale using digital speckle technology
The whole field deformation of sample, but its measurement accuracy is very restricted, it is difficult to be applied to small deformation and measure, and test equipment cost compared with
Greatly；Third is that being measured using radial symmetric LVDT sensor, but the centering and fixation of its sample are extremely difficult, and gauge length
Segment length only has specimen finish length, and gauge length section is too short, it is difficult to obtain accurate deformation data.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of, and the radial deformation based on LVDT sensor measures dress
It sets, device assembly is simple, can effectively amplify radial deformation numerical value, measurement accuracy is improved, the case where not influencing explosive test
Under measure its hoop strain variation.
In order to reach above-mentioned technical effect, the present invention provides the following technical scheme that
A kind of radial deformation measuring device based on LVDT sensor, including auxiliary mould and sensor device, the biography
Sensor arrangement includes that flexible iron wire, LVDT coil, LVDT iron core, spring and bolt, sample are fixed on flexible iron wire and backman
Between dress, one end of flexible iron wire connection bolt and the side for being fixed on auxiliary mould, the other end of flexible iron wire successively with bullet
Spring and the series connection of LVDT iron core, and it is inserted through LVDT coil, the LVDT coil is fixed on the other side of the auxiliary mould.
Further technical solution is that the side of the auxiliary mould is provided with U-shaped notch, is used for fixing bolt, another
End is provided with cylindrical hole, for fixing LVDT coil.
Further technical solution is that the side of the auxiliary mould and sample contacts is V-shape structure, and the sample is solid
It is scheduled on the groove of V-shape structure.
The present invention is based on the high-resolution of LVDT sensor, reequip to it, have by the flexible iron wire around sample
The variation of length is imitated to amplify sample radial deformation.When sample radially changes, flexible iron wire variation is driven, and then cause
The contraction or elongation of spring cause movement of the LVDT iron core in LVDT coil, to be obtained by LVDT perception measurement.
Testing the deformation displacement directly measured is Δ L, radial strain calculation formula
In formula: ε is radial strain, unit mm/mm；Δ L is that LVDT sensor measures displacement, unit mm；D is that sample is straight
Diameter, unit mm.Test specimen radial strain is calculated according to formula (1).
Compared with prior art, the invention has the following beneficial effects: the device can effectively according to sample common eigenvector, and
And structure is simple, it is convenient for mounting and clamping, and the high-precision of LVDT sensor has been played, an important bright spot of the device is radial direction
The gauge length of strain testing has increased to (π+2) D by diameter D, and gauge length increases 157%, further improves measurement accuracy.The dress
Set the radial small deformation measurement under the stretching for being widely portable to material, compression and confining pressure scene.
Detailed description of the invention
Fig. 1 is the overall structure diagram of apparatus of the present invention；
Fig. 2 is the overhead sectional view of apparatus of the present invention；
Fig. 3 is the structural schematic diagram of auxiliary mould of the invention；
Fig. 4 is the connection schematic diagram of LVDT sensor of the invention.
Wherein, 1- sample, 2- flexibility iron wire, 3- auxiliary mould, 4-LVDT coil, 5-LVDT iron core, 6- bolt, 7- bullet
Spring.
Specific embodiment
The present invention is further explained and is illustrated in the following with reference to the drawings and specific embodiments.
As depicted in figs. 1 and 2, the present invention provides a kind of radial deformation measuring devices based on LVDT sensor, including
Sample 1, auxiliary mould 3 and sensor device, the sensor device include flexible iron wire 2, LVDT coil 4, LVDT iron core 5,
Spring 7 and bolt 6, the sample 1 are fixed between flexible iron wire 2 and auxiliary mould 3, and one end of flexible iron wire 2 connects bolt 6
And it is fixed on the side of auxiliary mould 3, the other end of flexible iron wire 2 is successively connected with spring 7 and LVDT iron core 5, and is inserted through
LVDT coil 4, the LVDT coil 4 are fixed on the other side of the auxiliary mould 3.The side of the auxiliary mould 3 is provided with U
Type notch is used for fixing bolt 6, and the other end is provided with cylindrical hole, for fixing LVDT coil 4.The auxiliary mould and examination
The side of sample contact is V-shape structure, and the sample is fixed on the groove of V-shape structure.
When installation, LVDT coil is fixed at the cylindrical hole of auxiliary mould first, by LVDT iron core, flexible iron wire,
Spring series connection, and LVDT coil is inserted through by auxiliary mould, consolidate by iron wire around experimental sample and in other end connection bolt
Due to auxiliary mould other side indentation, there.By adjust bolt control spring contraction degree, with realize the firm clamping of tooling with
And LVDT sensor is placed in measurement range.
For test specimen during undergoing radial deformation, flexible iron wire drives elasticity that can contract with sample radial deformation
Short or elongation, further LVDT iron core change with coil relative position, by reading LVDT sensor displacement reading, knot
Specimen finish information is closed, calculates test specimen radial strain using formula.
It is understood that embodiment of above is intended to be merely illustrative of the present the principle of patent and uses exemplary
Embodiment, however the present invention is not limited thereto.For those skilled in the art, the present invention is not being departed from
Spirit and essence in the case where, various changes and modifications can be made therein (such as change characteristic size), these variations and modifications
Also it is considered as protection scope of the present invention.
Claims (3)
1. a kind of radial deformation measuring device based on LVDT sensor, which is characterized in that filled including auxiliary mould and sensor
It sets, the sensor device includes that flexible iron wire, LVDT coil, LVDT iron core, spring and bolt, sample are fixed on flexible iron wire
Between auxiliary mould, one end connection bolt of flexible iron wire and the side for being fixed on auxiliary mould, the other end of flexible iron wire
It successively connects with spring and LVDT iron core, and is inserted through LVDT coil, the LVDT coil is fixed on the another of the auxiliary mould
Side.
2. the radial deformation measuring device according to claim 1 based on LVDT sensor, which is characterized in that the auxiliary
The side of tooling is provided with U-shaped notch, is used for fixing bolt, the other side is provided with cylindrical hole, for fixing LVDT coil.
3. the radial deformation measuring device according to claim 1 based on LVDT sensor, which is characterized in that the auxiliary
The side of tooling and sample contacts is V-shape structure, and the sample is fixed on the groove of V-shape structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910802322.0A CN110375638A (en) | 2019-08-28 | 2019-08-28 | A kind of radial deformation measuring device based on LVDT sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910802322.0A CN110375638A (en) | 2019-08-28 | 2019-08-28 | A kind of radial deformation measuring device based on LVDT sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110375638A true CN110375638A (en) | 2019-10-25 |
Family
ID=68261057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910802322.0A Pending CN110375638A (en) | 2019-08-28 | 2019-08-28 | A kind of radial deformation measuring device based on LVDT sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110375638A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074858A (en) * | 2021-04-01 | 2021-07-06 | 昆明理工大学 | Sensing system for measuring dynamic blasting state, sample system and test method |
| CN113075024A (en) * | 2021-04-01 | 2021-07-06 | 昆明理工大学 | Explosion loading device and test system for porous digital dynamic caustic experiment system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS617401A (en) * | 1984-06-21 | 1986-01-14 | Shimadzu Corp | Device for measuring strain of circumference or diameter of round rod test piece |
| CN2303265Y (en) * | 1997-08-26 | 1999-01-06 | 中国科学院武汉岩土力学研究所 | Sliding trough like ring deformation measuring arrangement |
| CN103994715A (en) * | 2014-06-04 | 2014-08-20 | 宁波市鄞州富春精密铸造有限公司 | Device and method for measuring minimum diameter of diameter shrinkage portion of tensile sample after fracture |
| CN104655002A (en) * | 2015-02-13 | 2015-05-27 | 中国科学院武汉岩土力学研究所 | Rock specimen deformation measurement device and radial and axial deformation measurement method |
| CN106441210A (en) * | 2016-11-18 | 2017-02-22 | 中国科学院武汉岩土力学研究所 | Device for measuring circumferential strain of rock specimen |
| CN109342181A (en) * | 2018-12-18 | 2019-02-15 | 中国工程物理研究院化工材料研究所 | Fragile material three-dimensional tensile force test method and changeable type are bonded stretching tool |
| CN210426420U (en) * | 2019-08-28 | 2020-04-28 | 中国工程物理研究院化工材料研究所 | Radial deformation measuring device based on LVDT sensor |
-
2019
- 2019-08-28 CN CN201910802322.0A patent/CN110375638A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS617401A (en) * | 1984-06-21 | 1986-01-14 | Shimadzu Corp | Device for measuring strain of circumference or diameter of round rod test piece |
| CN2303265Y (en) * | 1997-08-26 | 1999-01-06 | 中国科学院武汉岩土力学研究所 | Sliding trough like ring deformation measuring arrangement |
| CN103994715A (en) * | 2014-06-04 | 2014-08-20 | 宁波市鄞州富春精密铸造有限公司 | Device and method for measuring minimum diameter of diameter shrinkage portion of tensile sample after fracture |
| CN104655002A (en) * | 2015-02-13 | 2015-05-27 | 中国科学院武汉岩土力学研究所 | Rock specimen deformation measurement device and radial and axial deformation measurement method |
| CN106441210A (en) * | 2016-11-18 | 2017-02-22 | 中国科学院武汉岩土力学研究所 | Device for measuring circumferential strain of rock specimen |
| CN109342181A (en) * | 2018-12-18 | 2019-02-15 | 中国工程物理研究院化工材料研究所 | Fragile material three-dimensional tensile force test method and changeable type are bonded stretching tool |
| CN210426420U (en) * | 2019-08-28 | 2020-04-28 | 中国工程物理研究院化工材料研究所 | Radial deformation measuring device based on LVDT sensor |
Non-Patent Citations (1)
| Title |
|---|
| 王启平: "机床夹具设计", vol. 1988, 哈尔滨工业大学出版社, pages: 35 - 36 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074858A (en) * | 2021-04-01 | 2021-07-06 | 昆明理工大学 | Sensing system for measuring dynamic blasting state, sample system and test method |
| CN113075024A (en) * | 2021-04-01 | 2021-07-06 | 昆明理工大学 | Explosion loading device and test system for porous digital dynamic caustic experiment system |
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