CN110220788B - In-situ micron mechanical loading device suitable for X-ray CT system - Google Patents
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- CN110220788B CN110220788B CN201910611033.2A CN201910611033A CN110220788B CN 110220788 B CN110220788 B CN 110220788B CN 201910611033 A CN201910611033 A CN 201910611033A CN 110220788 B CN110220788 B CN 110220788B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
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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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Abstract
The invention discloses an in-situ micron mechanical loading device suitable for an X-ray CT system, which comprises a main body shell, an upper pressure head component and a lower pressure head component, wherein the main body shell sequentially comprises a first cavity, a slender pipe and a second cavity from top to bottom; the upper pressure head assembly is fixedly connected with a first cylindrical rod through a screw, the sand containing cylinder is formed by gluing a thin-shell hollow cylinder and a bottom reinforcing seat and is used for containing sand particles, and the first cylindrical rod is in direct contact with a sample to be pressed; the lower pressure head assembly consists of a disc base and a second cylindrical rod, the second cylindrical rod is matched with the circular groove in the center of the disc base and fixed through gluing, and the lower pressure head assembly is used for supporting a pressed sample. The apparatus can provide a uniaxial compressive load of about 0.245N to 4N to the sample being tested.
Description
Technical Field
The invention relates to the technical field of material mechanical property testing, in particular to an in-situ micron mechanical loading device suitable for an X-ray CT system.
Background
With the rapid development of the fields of novel materials, micro-electro-mechanical systems, meter interfaces and the like, advanced micro-nano scale observation and experiment technology is urgently needed to carry out nondestructive, real-time and three-dimensional full-field research on the structure and performance evolution process of a sample under the condition of mechanical loading. However, at present, the most common instruments available for micro-force loading experiments, such as an atomic force microscope and a nanoindenter, can only be used for detecting the mechanical properties of the surface of the material. Considering that the X-ray CT technology is taken as an advanced nondestructive high-resolution three-dimensional structure detection means, and in-situ observation can be realized by introducing a mechanical loading device, the development of the micron mechanical loading device suitable for the X-ray CT system has important significance for deeply knowing and analyzing the structural change and the mechanical response rule of different materials in the micron-scale quasi-static loading process.
Because the micron mechanical loading device needs to be built on an X-ray CT system, and the characteristics of the X-ray CT imaging technology are considered, the micron mechanical loading device is required to meet the conditions that the operation is simple, the volume is as small as possible, 360-degree rotation can be realized, an X-ray easily-penetrated material is required to be adopted for a window part, and the like, and therefore the in-situ micron mechanical loading device suitable for the X-ray CT system needs to be developed.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides an in-situ micron mechanical loading device suitable for an X-ray CT system, is suitable for the X-ray CT system, can apply uniaxial compression load in the range of 0.245N to 4N (in the full-capacity state of a sand containing cylinder) to a sample by adjusting the capacity of fine sand poured into the sand containing cylinder, and can limit the vertical displacement of an upper pressure head component by applying a lateral constraint mode to prevent the occurrence of creep in the CT scanning process.
In order to achieve the technical effects, the invention provides the following technical scheme:
an in-situ micron mechanical loading device suitable for an X-ray CT system comprises a main body shell, an upper pressure head assembly and a lower pressure head assembly, wherein the main body shell sequentially comprises a first cavity, a slender pipe and a second cavity from top to bottom; the upper pressure head assembly is fixedly connected with a first cylindrical rod through a screw, the sand containing cylinder is formed by gluing a thin-shell hollow cylinder and a bottom reinforcing seat and is used for containing sand particles, and the first cylindrical rod is in direct contact with a sample to be pressed; the lower pressure head assembly consists of a disc base and a second cylindrical rod, the second cylindrical rod is matched with the circular groove in the center of the disc base and fixed through gluing, and the lower pressure head assembly is used for supporting a pressed sample.
A further technical scheme does, first cavity and second cavity are cylindrical, just first cavity, elongated tube, second cavity are adhesive connection in proper order.
A further technical scheme is that the bottom strengthening seat corresponding to the upper pressure head assembly on the side face of the bottom of the first cavity of the main body shell is provided with two symmetrical first threaded holes which are matched with fastening screws and used for limiting the vertical displacement of the upper pressure head assembly in a screwing state. The fastening screw is not provided with a protruding part protruding out of the device main body housing in a tightened state.
The further technical scheme is that a second threaded hole is formed in the side face of a second cavity of the main body shell and matched with a fastening screw to be used for clamping a disc base of the lower pressure head assembly. The fastening screw is not provided with a protruding portion protruding from the housing of the device body in a tightened state.
The further technical scheme is that a third threaded hole is formed in a second cavity of the main body shell, and the loading device is fixed on the X-ray CT system through matching with a fastening screw.
The further technical scheme is that three third threaded holes are formed in the second cavity of the main body shell and are uniformly distributed in the second cavity of the main body shell.
The further technical scheme is that a disc base of the lower pressing head assembly is made of stainless steel, and other components are made of transparent organic glass.
The further technical scheme is that the surface roughness of the outer wall of the first cylindrical rod, the outer wall of the second cylindrical rod and the inner wall of the elongated pipe of the main body shell is 1.6, and the surface roughness of the end faces of the first cylindrical rod and the second cylindrical rod is 0.8.
The present invention is further explained and explained below, and the in-situ micro mechanical loading device suitable for the X-ray CT system provided by the present invention includes a main body housing, an upper pressure head assembly and a lower pressure head assembly. The main body shell is in a goblet shape and is formed by gluing a cylindrical first cavity, an elongated tube and a cylindrical second cavity; the upper pressure head assembly is fixedly connected with a first cylindrical rod through a screw, the whole weight is 0.245N, the sand containing cylinder is formed by gluing a thin-shell hollow cylinder and a bottom reinforcing seat and is used for containing sand grains, and the first cylindrical rod is in direct contact with a pressed sample; the lower pressure head assembly consists of a disc base and a second cylindrical rod, the second cylindrical rod is matched with the circular groove in the center of the disc base and fixed through gluing, and the lower pressure head assembly is used for supporting a pressed sample. The main body shell is in a goblet shape, the first cylindrical cavity and the second cylindrical cavity of the main body shell do not interfere with components such as a ray source and a detector in an X-ray CT system in space, the slender tube of the main body shell and the first cylindrical slender rod and the second cylindrical slender rod which correspond to the upper pressing head component and the lower pressing head component respectively form a sample observation window, and the corresponding inner wall and the corresponding outer wall have smaller surface roughness and are well matched in size. Thereby the sample observation window can be close to X ray source and realize the higher resolution imaging, and removes the bearing stability of considering the device, and the disc base of push down the head subassembly is stainless steel material, and all the other materials are transparent organic glass material, can guarantee that the device has better hardness, intensity, and the sample observation window has splendid ray penetrability simultaneously, realizes the normal position CT detection to sample loading process. Utilize precision balance, the flourishing sand cylinder of going up the pressure head subassembly can hold different weight, different kind's graininess and exert heavy material to realize fine adjustment to the unipolar compressive load of exerting on the sample. The device can provide uniaxial compression load of about 0.245N to 4N (in the full capacity state of the sand filling cylinder) on the tested sample.
Compared with the prior art, the invention has the following beneficial effects: the device is fixed on a sample turntable of the X-ray CT system through 3 fastening screws, is convenient to install, simple to operate and strong in portability, and can be used on X-ray CT systems of different models. The cylindrical sample observation window of the device has a small diameter, and is made of organic glass materials which are easy to penetrate by rays, so that high-resolution and high-quality CT images of the sample structure can be guaranteed. The quasi-static uniaxial compression load applied to the sample is controllable in a certain range, so that in-situ CT observation of a micron mechanical loading process of the sample is realized, including microscopic structure change, mechanical response, fracture behavior and the like.
Drawings
FIG. 1 is a cross-sectional view of a micro-mechanical loading device structure provided by the present invention;
FIG. 2 is a cross-sectional view of a housing of a micro-mechanical loading device body provided by the present invention;
FIG. 3 is a cross-sectional view of a ram assembly of the micro-mechanical loading device provided by the present invention;
FIG. 4 is a cross-sectional view of a hold-down head assembly of the micro-mechanical loading device provided by the present invention;
the hollow-core-type disc-shaped hollow-core-type steel tube comprises a base, a first hollow cavity 1, a long tube 2, a second hollow cavity 3, a first screw hole 4, a second screw hole 5, a third screw hole 6, a thin-shell hollow cylinder 71, a bottom reinforcing seat 72, a first cylindrical rod 8, a second cylindrical rod 9 and a disc base 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be emphasized that the specific embodiments described herein are merely illustrative and are not limiting.
Example 1
As shown in fig. 1, the present invention provides an in-situ micrometer mechanical loading device suitable for an X-ray CT system, which includes a main body housing (fig. 2), an upper ram assembly (fig. 3) and a lower ram assembly (fig. 4). The main body shell is in a goblet shape and is formed by gluing a first cavity 1, an elongated tube 2 and a second cavity 3; the upper pressure head assembly is fixedly connected with a first cylindrical rod 8 through a screw, the whole weight is 0.245N, the sand containing cylinder is formed by gluing a thin-shell hollow cylinder 71 and a bottom reinforcing seat 72 and is used for containing sand particles, and the first cylindrical rod 8 is in direct contact with a sample to be pressed; the lower pressure head assembly consists of a disc base 10 and a second cylindrical rod 9, the second cylindrical rod 9 is matched with a central circular groove of the disc base 10 and fixed through gluing, and the lower pressure head assembly is used for supporting a pressed sample.
The operation sequence is as follows: firstly, a lower pressure head component is placed on a horizontal table, and a sample is placed at the center of the end face of a second cylindrical rod of the lower pressure head component. After the main body shell and the upper pressure head assembly are assembled, the lower pressure head assembly with a sample is slowly sleeved, when the upper pressure head assembly moves downwards to contact with the sample, two hexagonal concave end fastening screws on a first screw hole 4 on the side surface of a first cavity of the main body shell corresponding to a reinforcing seat at the bottom of the upper pressure head assembly and one hexagonal concave end fastening screw on a second screw hole 5 on the side surface of a second cavity of the main body shell are screwed, no protruding part extending out of the main body shell is ensured, and the whole device is placed on a sample turntable of an X-ray CT system and then 3 fastening screws on a third screw hole 6 of the second cavity of the main body shell are screwed. The method comprises the following steps of weighing fine sand with the same weight as a load to be applied by using a balance, pouring the fine sand into a sand containing cylinder, loosening two hexagonal concave end fastening screws on a first screw hole 4 on the side surface of a first cavity of a main body shell, screwing two screws on the side surface of the first cavity of the main body shell again after an upper pressure head assembly descends and the load is stably applied, limiting the displacement of the upper pressure head assembly in the vertical direction, acquiring an X-ray CT image, and disassembling the whole device according to the reverse order of the installation process after scanning is completed.
Although the invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be the only preferred embodiments of the invention, it is not intended that the invention be limited thereto, since many other modifications and embodiments will be apparent to those skilled in the art and will be within the spirit and scope of the principles of this disclosure.
Claims (8)
1. An in-situ micron mechanical loading device suitable for an X-ray CT system is characterized by comprising a main body shell, an upper pressure head assembly and a lower pressure head assembly, wherein the main body shell sequentially comprises a first cavity, a slender pipe and a second cavity from top to bottom; the main body shell is in a high-foot cup shape, the upper pressure head assembly is fixedly connected with a sand containing cylinder and a first cylindrical rod through screws, the sand containing cylinder is formed by gluing a thin-shell hollow cylinder and a bottom reinforcing seat and is used for containing sand grains, and the first cylindrical rod is in direct contact with a pressed sample; the lower pressure head assembly is composed of a disc base and a second cylindrical rod, the second cylindrical rod is matched with a circular groove in the center of the disc base and fixed through gluing, and the lower pressure head assembly is used for supporting a pressed sample.
2. The in-situ micromechanical loading device for an X-ray CT system according to claim 1, wherein said first and second cavities are cylindrical, and said first, elongated and second cavities are sequentially connected by gluing.
3. The in-situ micromechanical loading device for an X-ray CT system according to claim 1, wherein two first screw holes are symmetrically disposed on the bottom side of the first cavity of the main housing corresponding to the bottom reinforcement seat of the upper ram assembly, and are used to limit the vertical displacement of the upper ram assembly when the first screw holes are tightened.
4. The in-situ micromechanical loading device for an X-ray CT system according to claim 1, wherein a second threaded hole is disposed on a side of the second cavity of the main housing for engaging with a fastening screw for clamping a disk base of the hold-down head assembly.
5. The in-situ micromechanical loading device for an X-ray CT system according to claim 1, wherein the second cavity of the main housing is provided with a third threaded hole for fastening a fastening screw to fix the loading device on the X-ray CT system.
6. The in-situ micromechanical loading device for an X-ray CT system according to claim 5, wherein three threaded holes are provided and uniformly distributed on the second cavity of the main housing.
7. The in-situ micromechanical loading device for an X-ray CT system of claim 1, wherein the disk base of the hold-down assembly is made of stainless steel and the remaining components are made of transparent organic glass.
8. The in-situ micromechanical loading device for an X-ray CT system according to claim 1, wherein the outer wall of the first cylindrical rod, the outer wall of the second cylindrical rod, and the inner wall of the elongated tube of the main housing have a surface roughness of 1.6, and the end surfaces of the first cylindrical rod and the second cylindrical rod have a surface roughness of 0.8.
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| JP2007165236A (en) * | 2005-12-16 | 2007-06-28 | Hitachi Medical Corp | Microfocus x-ray tube and x-ray apparatus using the same |
| DE102007001928B4 (en) * | 2007-01-12 | 2009-06-18 | Yxlon International X-Ray Gmbh | Method and device for the in-situ examination of mechanically loaded test objects by means of computed tomography |
| JP5135941B2 (en) * | 2007-08-07 | 2013-02-06 | 富士通株式会社 | Elemental analysis apparatus and method |
| US8602648B1 (en) * | 2008-09-12 | 2013-12-10 | Carl Zeiss X-ray Microscopy, Inc. | X-ray microscope system with cryogenic handling system and method |
| JP2010127797A (en) * | 2008-11-28 | 2010-06-10 | Shimadzu Corp | Small-sized material testing machine |
| CN101710084B (en) * | 2009-12-25 | 2012-04-25 | 中国矿业大学(北京) | Load sleeve for industrial CT experiment table |
| CN202057617U (en) * | 2011-04-19 | 2011-11-30 | 赵宏伟 | Miniaturized in-situ nano-indentation testing device |
| CN102323279B (en) * | 2011-06-17 | 2013-01-09 | 东南大学 | X-ray tomography-based in-situ loading device |
| CN104034595B (en) * | 2014-05-28 | 2016-07-06 | 中国建筑股份有限公司 | Fresh mortar slurry is without the determinator of lateral spacing bearing capacity and assay method |
| US10274437B2 (en) * | 2015-01-22 | 2019-04-30 | Halliburton Energy Services, Inc. | Methods and systems of testing formation samples using a rock hydrostatic compression chamber |
| CN204666449U (en) * | 2015-05-21 | 2015-09-23 | 中国工程物理研究院核物理与化学研究所 | A kind of original position pressure loading device for neutron small angle scattering |
| CN106370675B (en) * | 2015-07-21 | 2019-02-19 | 中国矿业大学(北京) | A kind of industry CT scan test system |
| JP6658426B2 (en) * | 2016-09-23 | 2020-03-04 | 住友電気工業株式会社 | X-ray CT analysis jig |
| CN108871994A (en) * | 2017-05-11 | 2018-11-23 | 刘运武 | The starch-containing measuring appliance of potato |
| CN108195671B (en) * | 2017-12-11 | 2020-08-18 | 中国科学院力学研究所 | In-situ tension and compression device based on computed tomography |
| CN208000244U (en) * | 2018-04-23 | 2018-10-23 | 同济大学 | A kind of small-sized one-dimensional compression test device for soil mechanics test |
| CN108645726A (en) * | 2018-04-23 | 2018-10-12 | 同济大学 | Compact high precision uniaxial cycling load compression test equipment |
| CN108340622A (en) * | 2018-05-17 | 2018-07-31 | 中国工程物理研究院化工材料研究所 | A kind of stamping of powder molding machine in situ suitable for X-ray CT system |
| CN208505835U (en) * | 2018-07-27 | 2019-02-15 | 镇江立达纤维工业有限责任公司 | A kind of resin flow device for testing |
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