CN108195671B - In-situ tension and compression device based on computed tomography - Google Patents
In-situ tension and compression device based on computed tomography Download PDFInfo
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- CN108195671B CN108195671B CN201711303827.XA CN201711303827A CN108195671B CN 108195671 B CN108195671 B CN 108195671B CN 201711303827 A CN201711303827 A CN 201711303827A CN 108195671 B CN108195671 B CN 108195671B
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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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- G—PHYSICS
- 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
- G01N23/04—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 and forming images of the material
- G01N23/046—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 and forming images of the material using tomography, e.g. computed tomography [CT]
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Abstract
The invention provides an in-situ tension and compression device based on computed tomography, which comprises: the device comprises a tension and compression loading module, an experiment cavity module, a control module, an outgoing line fixing module and a base; the tension-compression loading module, the experiment cavity module and the control module are all arranged on the base, the base is arranged on a rotatable CT sample table, and the outgoing line fixing module is arranged on a non-rotatable part of the CT sample table; the experiment cavity module is used for containing sample materials; the tension-compression loading module is used for providing power and rotation concentricity for tension-compression loading of the sample material loaded in the experiment cavity module and measuring experiment data; the control module is used for sending an operation instruction to the pull-press loading module, receiving the experimental data measured by the pull-press loading module and processing the experimental data. By applying the device, the evolution process of the internal structure of the sample material in the loading state can be obtained.
Description
Technical Field
The invention relates to the technical field of scientific instruments, in particular to an in-situ tension and compression device based on computed tomography.
Background
With the progress of science and technology, the research on the evolution of the internal microstructure of the material and the relation between the mechanical properties of the material is of great importance to the development of new materials, so that how to obtain the evolution of the internal microstructure of the material under the action of external force has great significance.
In the prior art, a computed tomography technology can obtain a three-dimensional image of a measured object through a projection reconstruction method based on an interaction principle of rays and substances, and is widely applied to the field of testing of various materials, wherein an in-situ tension and compression device based on computed tomography can obtain a real deformation condition inside the material, and reveals the deformation, damage and evolution process of an internal structure in the damage process of the material under the action of external force.
However, in the prior art, the in-situ tension and compression device based on computed tomography is deficient, and different manufacturers for producing CT devices have different models of the produced CT devices, and different manufacturers do not have matched in-situ tension and compression devices with pertinence.
Disclosure of Invention
In view of the above, an embodiment of the present invention provides an in-situ tension and compression device based on computed tomography to obtain an evolution process of an internal structure of a sample material in a loaded state.
The embodiment of the invention provides an in-situ tension and compression device based on computed tomography, which comprises: the device comprises a tension and compression loading module, an experiment cavity module, a control module, an outgoing line fixing module and a base;
the tension and compression loading module, the experiment cavity module and the control module are all arranged on the base, and the outgoing line fixing module is arranged on a non-rotatable part of the CT sample table;
the experiment cavity module is used for containing sample materials;
the tension-compression loading module is used for providing power and rotation concentricity for tension-compression loading of the sample material loaded in the experiment cavity module and measuring experiment data;
the control module is used for sending an operation instruction to the pull-press loading module, receiving the experimental data measured by the pull-press loading module and processing the experimental data.
Optionally, the tension-compression loading module includes a power assembly and a measurement assembly;
the power assembly comprises a planetary reducer, a servo motor and a ball screw;
the measuring component comprises a grating ruler and a pressure sensor.
Optionally, the experiment cavity module includes: the device comprises an upper cover, a connecting piece, an upper end clamp, a loading cavity and a lower end clamp;
the upper end clamp is fixed on the upper cover, the lower end clamp is fixed on the pressure sensor, and the upper end clamp and the lower end clamp are used for clamping the sample material.
Optionally, the loading cavity is made of a carbon fiber material;
the connecting piece adopts stainless steel material.
Optionally, the middle part of the connecting piece is provided with a bonding groove with a set depth;
the loading cavity is bonded in the bonding groove in a bonding mode.
Optionally, the outlet fixing module includes: the lead-out wire, the lead-out wire tray, the guide rail, the tank chain wire groove, the guide rail slider and the spring;
the guide rail is positioned on the right side of the outgoing line tray, and the guide rail sliding block is positioned on the guide rail;
one end of the outgoing line is connected to the bottom end of the tension and compression loading module;
the tank chain line groove is used for fixing the outgoing line, and the outgoing end of the tank chain line groove is connected with the guide rail sliding block;
one end of the spring is connected with the guide rail sliding block, and the other end of the spring is fixed at the port of the outgoing line.
Optionally, the base is fixed on the CT sample stage by a positioning screw and a positioning pin.
As can be seen from the above embodiments, the in-situ tension and compression device based on computed tomography according to the embodiments of the present invention includes: the device comprises a tension and compression loading module, an experiment cavity module, a control module, an outgoing line fixing module and a base. The extension wire fixing module is arranged on a non-rotatable part of the CT sample table through expansion screws; the experiment cavity module is used for containing sample materials; the tension and compression loading module is used for providing power and rotation concentricity for loading, tension and compression of the sample material loaded in the experiment cavity module and measuring experiment data; the control module is used for sending an operation instruction to the pull-press loading module, receiving the experimental data measured by the pull-press loading module and processing the experimental data. Through the device, the evolution process of the internal structure of the sample material in the loading state can be obtained, and the device is an effective experimental tool for researching the real-time evolution process of the internal structure of the material under the action of external force loading.
Drawings
Fig. 1 is a schematic structural diagram of an in-situ tension-compression device based on computed tomography according to an embodiment of the present invention;
FIG. 2 is a schematic view of a connection structure between a connection member and a loading chamber according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pinout fixing module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below in conjunction with the drawings and the embodiments in the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of an in-situ tension/compression device based on computed tomography according to an embodiment of the present invention.
The in-situ tension and compression device based on computed tomography as illustrated in fig. 1 includes a tension and compression loading module 11, an experiment cavity module 12, a control module 13, an outgoing line fixing module 14, and a base 15;
the tension and compression loading module 11, the experiment cavity module 12 and the control module 13 are all installed on the base 15, and the outgoing line fixing module 14 is installed on the non-rotatable part of the sample stage of the CT system through an expansion screw.
Specifically, in the embodiment of the present invention, the experiment chamber module 12 may be used for holding a sample material.
In one embodiment, the assay chamber module 12 comprises: an upper cover 121, a connecting member 122, an upper end clamp 123, a loading chamber 124, and a lower end clamp 125. The upper end clamp 123 is fixed on the upper cover 121, the lower end clamp 125 is fixed on the pressure sensor 115 in the tension/compression loading module 11, and the upper end clamp 123 and the lower end clamp 125 are used for clamping the sample material contained in the experiment cavity module 12.
In an embodiment, a material with a relatively high density is used as the loading cavity to influence the intensity of the X-rays irradiated on the test piece, so that the size of the test sample is reduced, and in addition, when the output power of the CT apparatus for emitting the X-rays exceeds a certain value, the X-rays generate a defocusing phenomenon, which affects the resolution of imaging.
In one embodiment, the connecting member 122 may be made of stainless steel.
In one embodiment, the connection structure between the connecting member 122 and the loading chamber 124 can be as shown in fig. 2. In fig. 2, the middle of the connecting member 122 is provided with an adhesive groove 1221 having a predetermined depth, for example, 5mm, and the connecting end of the loading cavity 124 is coated with an adhesive and inserted into the adhesive groove 1221. Through the treatment, the contact area between the connecting piece 122 and the loading cavity 124 can be increased, and the tensile and compression strength of the bonding part can be increased.
In the embodiment of the present invention, after the loading chamber 124 is adhesively bonded in the bonding groove 1221 of the connecting member 122, tensile, compressive, and fatigue test tests may be performed, wherein the tensile force of the tensile test may be set to 2T, the compressive force of the compressive test may also be set to 2T, and the number of the fatigue test tests is not less than 100000 times.
In the embodiment of the present invention, the tension-compression loading module 11 may be configured to provide a power and a rotation concentricity for tension-compression loading of the sample material loaded in the experiment cavity module 12, and measure experiment data, such as force, displacement, and the like.
In one embodiment, the tension/compression loading module 11 may include a power assembly, a measurement assembly; wherein the power assembly may include a planetary reducer 111, a servo motor 112, and a ball screw 113; the measuring assembly may include a grating scale 114 and a pressure sensor 115.
In this embodiment of the present invention, the control module 13 may be configured to send an operation instruction to the pull/press loading module 11, receive experimental data measured by the pull/press loading module 11, and process the experimental data.
In an embodiment, the data line in the control module 13 may adopt a shielded line, so as to implement functions of loading, maintaining load, suspending test, and the like in a test process.
In the embodiment of the present invention, in order to prevent the lead wires connecting between the tension-compression loading module 11 and the CT sample stage from being entangled during the rotation process, the lead wire fixing module 14 may adopt a structure as illustrated in fig. 3, in consideration that the tension-compression loading module 11 needs to rotate 360 degrees on the CT sample stage.
Pinout securing module 14 as illustrated in fig. 3 may include: an outlet wire 141, an outlet wire tray 142, a guide rail 143, a tank chain groove 144, a guide rail slider 145, and a spring 146.
Specifically, the guide rail 143 is located on the right side of the lead-out wire tray 142, and the guide rail slider 145 is located on the guide rail 143; one end of the lead-out wire 141 is connected to the bottom end of the tension/compression loading module 11; the tank chain line groove 144 is used for fixing the outgoing line 141, and the outgoing end of the tank chain line groove is connected with the guide rail sliding block 145; one end of the spring 146 is connected to the rail slider 145, and the other end is fixed to a port of the lead-out wire 141.
In the embodiment of the invention, the base 15 can be fixed on the CT sample stage by a positioning screw and a positioning pin, and the loading center and the rotation center of the sample stage are ensured to be coaxial.
As can be seen from the above embodiments, the in-situ tension and compression device based on computed tomography according to the embodiments of the present invention includes: the device comprises a tension and compression loading module, an experiment cavity module, a control module, an outgoing line fixing module and a base; the extension wire fixing module is arranged on a non-rotatable part of a CT sample table through expansion screws; the experiment cavity module is used for containing sample materials; the tension and compression loading module is used for providing power and rotation concentricity for loading, tension and compression of the sample material loaded in the experiment cavity module and measuring experiment data; the control module is used for sending an operation instruction to the pull-press loading module, receiving the experimental data measured by the pull-press loading module and processing the experimental data. Through the device, the evolution process of the internal structure of the sample material in the loading state can be obtained, and the device is an effective experimental tool for researching the real-time evolution process of the internal structure of the material under the action of external force loading.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (6)
1. An in-situ tension and compression device based on computed tomography, which is characterized by comprising: the device comprises a tension and compression loading module, an experiment cavity module, a control module, an outgoing line fixing module and a base;
the tension and compression loading module, the experiment cavity module and the control module are all arranged on the base, and the outgoing line fixing module is arranged on a non-rotatable part of the CT sample table;
the experiment cavity module is used for containing sample materials;
the tension-compression loading module is used for providing power and rotation concentricity for tension-compression loading of the sample material loaded in the experiment cavity module and measuring experiment data;
the control module is used for sending an operation instruction to the pull-press loading module, receiving experimental data measured by the pull-press loading module and processing the experimental data;
the experiment cavity module comprises: the device comprises an upper cover, a connecting piece, an upper end clamp, a loading cavity and a lower end clamp;
the middle part of the connecting piece is provided with a bonding groove with set depth;
the outgoing line fixing module includes: the lead-out wire, the lead-out wire tray, the guide rail, the tank chain wire groove, the guide rail slider and the spring;
the guide rail is positioned on the right side of the outgoing line tray, and the guide rail sliding block is positioned on the guide rail;
one end of the outgoing line is connected to the bottom end of the tension and compression loading module;
the tank chain line groove is used for fixing the outgoing line, and the outgoing end of the tank chain line groove is connected with the guide rail sliding block;
one end of the spring is connected with the guide rail sliding block, and the other end of the spring is fixed at the port of the outgoing line.
2. The device of claim 1, wherein the tension and compression loading module comprises a power assembly, a measurement assembly;
the power assembly comprises a planetary reducer, a servo motor and a ball screw;
the measuring component comprises a grating ruler and a pressure sensor.
3. The apparatus of claim 2, wherein the upper end clamp is fixed to the upper cover, the lower end clamp is fixed to the pressure sensor, and the upper end clamp and the lower end clamp are used for clamping the sample material.
4. The device of claim 3, wherein the loading chamber is made of carbon fiber material;
the connecting piece adopts stainless steel material.
5. The apparatus of claim 3, wherein the loading chamber is adhesively bonded in the bonding groove.
6. The apparatus of claim 1, wherein the base is fixed on the CT sample stage by a set screw and a set pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711303827.XA CN108195671B (en) | 2017-12-11 | 2017-12-11 | In-situ tension and compression device based on computed tomography |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711303827.XA CN108195671B (en) | 2017-12-11 | 2017-12-11 | In-situ tension and compression device based on computed tomography |
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| CN108195671A CN108195671A (en) | 2018-06-22 |
| CN108195671B true CN108195671B (en) | 2020-08-18 |
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| CN110220788B (en) * | 2019-07-08 | 2022-07-26 | 中国工程物理研究院化工材料研究所 | In-situ micron mechanical loading device suitable for X-ray CT system |
| CN111077014B (en) * | 2020-03-11 | 2021-02-19 | 南京航空航天大学 | Micro-CT in-situ loading device and testing method for microscopic damage of ceramic matrix composite |
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| CN202490991U (en) * | 2011-12-27 | 2012-10-17 | 比亚迪股份有限公司 | Welding device used for rotary transformer |
| US9057681B2 (en) * | 2012-12-07 | 2015-06-16 | The Regents Of The University Of California | High-temperature strain cell for tomographic imaging |
| CN104330308A (en) * | 2014-11-13 | 2015-02-04 | 中国科学技术大学 | SR-CR micro force loading device for detecting micro-nano structure evolution of material on line |
| CN106370521A (en) * | 2016-11-18 | 2017-02-01 | 盐城工学院 | In-situ tension and compression testing platform and observation system |
| CN107014841A (en) * | 2017-05-25 | 2017-08-04 | 中国科学技术大学 | A kind of SR CT mechanical test systems and SR CT mechanical test methods |
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