CN111024462A - Sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control - Google Patents
Sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control Download PDFInfo
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- CN111024462A CN111024462A CN201811173999.4A CN201811173999A CN111024462A CN 111024462 A CN111024462 A CN 111024462A CN 201811173999 A CN201811173999 A CN 201811173999A CN 111024462 A CN111024462 A CN 111024462A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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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
- 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
-
- 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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
-
- 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
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
Abstract
The invention relates to the field of metal material plastic machinability evaluation, in particular to a sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control, which comprises the following steps: (1) determining the size of the sample, the material and the specification of the sheath ring by combining a finite element numerical simulation mode according to the hydrostatic pressure level required by the internal material; (2) selecting a tester or a press with corresponding tonnage according to the strength of the internal material, the strength of the material of the sheath ring and the deformation temperature; (3) processing the sample according to the size of the sample, and respectively welding thermocouples on the surface of the sample and the sheath ring; (4) connecting the welded thermocouple to the corresponding test channel and control channel to realize the test and control of the temperature of the sample and the temperature of the sheath ring in the deformation process; (5) the deformation experiments were carried out in a testing machine or a press. The invention can realize higher hydrostatic pressure and can accurately measure and control the temperature of the sample in the deformation process.
Description
The technical field is as follows:
the invention relates to the field of evaluation of plastic machinability of metal materials, in particular to a sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control, which can realize higher hydrostatic pressure and accurately measure and control the temperature of a sample in a deformation process.
Background art:
at present, the triaxial stress of the core of the metal material sample in the free compression process is about-1. Although in a three-way compressive stress state, higher hydrostatic pressure levels cannot be achieved. In order to obtain a high hydrostatic pressure, the jacket compression must be carried out by means of an annular jacket on the surface of the freely compressed sample. The literature (Essa K, Kacmarcik I, Hartley P, et al. assembling of bi-metallic ring bullets. journal of Materials processing technology,2012,212(4): 817) 824.) studies of different jacket ring Materials and jacket ring Materials of different thicknesses by combining finite element numerical simulation with experiments, and during compression at room temperature, the contact condition of the inner wall of the jacket ring with the inner sample. The results show that: when the height-diameter ratio of the sheath ring is greater than 1.5, the inner wall of the sheath ring is better contacted with the sample in the compression deformation process. However, the research does not relate to the law that different jacket ring thicknesses and different jacket materials influence the hydrostatic pressure on the internal materials, and the designed sample cannot realize accurate measurement and control of the sample temperature in the high-temperature deformation process. Therefore, the invention can realize higher hydrostatic pressure by the design of the compressed sample sheath, and can accurately measure and control the temperature in the high-temperature sheath compression process.
The invention content is as follows:
the invention aims to provide a sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control.
The technical scheme of the invention is as follows:
a sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control comprises the following steps:
(1) sample design: determining the size of the sample, the material and the specification of the sheath ring by combining a finite element numerical simulation mode according to the hydrostatic pressure level required by the internal material;
(2) selecting a testing machine: selecting a tester or a press with corresponding tonnage according to the strength of the internal material, the strength of the material of the sheath ring and the deformation temperature;
(3) sample processing and welding thermocouple: processing the sample according to the size of the sample designed in the step (1), and respectively welding thermocouples on the surface of the sample and the sheath ring;
(4) connecting the thermocouple welded in the step (3) to a corresponding test channel and a corresponding control channel to realize the test and control of the temperature of the sample and the temperature of the sheath ring in the deformation process;
(5) and (3) carrying out deformation experiments on the step (2) testing machine or the pressing machine.
The sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control adopts the mode that the periphery of a cylindrical sample is coated with a coating ring, the coating ring is of a structure formed by an upper coating ring and a lower coating ring which are arranged from top to bottom, a temperature control groove is formed in the side face of the lower part of the upper coating ring, and the cylindrical sample is exposed at the temperature control groove.
According to the sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control, a thermocouple I is welded on the surface of a cylindrical sample exposed at a temperature control groove, the thermocouple I is led out through a lead of the thermocouple I, a thermocouple II is welded on the side surface of a lower wrapping lantern ring, and the thermocouple II is led out through a lead of the thermocouple II.
According to the sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control, two thermocouples I are welded on the surface of the middle part of a cylindrical sample, the distance between the thermocouples is 2-4 mm, and the thermocouples I are connected to a temperature control channel.
According to the sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control, two thermocouples II are welded on the side face of the lower wrapping sleeve ring, the distance between the thermocouples is 2-4 mm, and the thermocouples II are connected to a temperature measurement channel.
The sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control has the advantages that the width of a temperature control groove is 2-4 mm, and the depth of the temperature control groove is 1-3 mm.
According to the sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control, the high-temperature lubricant is coated on the surfaces of the sample and the sheath ring, so that the influence of friction force in the deformation process is reduced.
The invention has the following advantages and beneficial effects:
(1) according to the invention, by adopting the high-strength material packing ring, the internal sample can realize higher hydrostatic pressure, and the plastic deformation capacity of the material is improved;
(2) according to the invention, through the design of the sample, the temperature of the sheathing ring and the internal material can be accurately measured and controlled in the high-temperature deformation process;
(3) the invention has wider application range, simple sample design and easy processing, and is more favorable for the forming process of low-plasticity materials.
Description of the drawings:
FIG. 1 is a schematic illustration of a sample, wherein: 1 cylindrical sample, 2 upper wrapping lantern rings, 3 lower wrapping lantern rings and 4 temperature control grooves.
FIG. 2 is a schematic diagram of a sample welding thermocouple position, wherein: 1 cylindrical sample, 2 upper wrapping lantern rings, 3 lower wrapping lantern rings, 4 temperature control grooves, 5 leading wires of a thermocouple I and 6 leading wires of a thermocouple II.
FIG. 3 is a diagram of a rare earth magnesium alloy sheath compressed sample, wherein the cylindrical material is Mg-Gd-Y-Zn-Zr rare earth magnesium alloy, and the sheath ring material is GH4169 alloy.
FIG. 4 is a diagram of a rare earth magnesium alloy sheath compression sample welding thermocouple.
FIG. 5 is a graph of thermocouple test results during sheath compression of rare earth magnesium alloy at 400 ℃; in the figure, the abscissa Time represents Time(s) and the ordinate Temperature represents Temperature (. degree. C.).
FIG. 6 is a diagram of the results of three-axis finite element simulation of stress for jacket materials of different strengths, including: the method comprises the following steps of (1) freely compressing the rare earth magnesium alloy (without a sheath), preparing a hard sheath material (cold deformation + double-stage aging GH4169) and preparing a soft sheath material (cold deformation GH 4169); in the figure, the abscissa Time represents Time(s), and the ordinate Stress triaxiality represents the Stress triaxiality.
The specific implementation mode is as follows:
as shown in fig. 1 and 3, the periphery of a cylindrical sample 1 of the present invention is covered with a covering ring, the covering ring is a structure in which an upper covering ring 2 and a lower covering ring 3 are arranged up and down, a temperature control groove 4 is formed on the lower side surface of the upper covering ring 2, and the cylindrical sample 1 is exposed at the temperature control groove 4.
As shown in fig. 2 and 4, the periphery of a cylindrical sample 1 of the invention is covered by a covering ring, the covering ring is of a structure that an upper covering ring 2 and a lower covering ring 3 are arranged up and down, the side surface of the lower part of the upper covering ring 2 is provided with a temperature control groove 4, the surface of the cylindrical sample 1 exposed at the temperature control groove 4 is welded with a thermocouple i, the thermocouple i is led out through a lead 5 of the thermocouple i, the side surface of the lower covering ring 3 is welded with a thermocouple ii, and the thermocouple ii is led out through a lead 6 of the thermocouple ii.
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
Example 1:
in this embodiment, taking a solid solution Mg-13Gd-4Y-2Zn-0.5Zr rare earth magnesium alloy as an example, the cold deformation + two-stage aging GH4169 alloy is selected as the jacket ring material, and the specific operation steps are as follows:
(1) a finite element simulation software ABAQUS is adopted, high-temperature alloy GH4169 materials in different states are obtained through finite element simulation to serve as wrapping rings, the three axial degrees of internal stress of the rare earth magnesium alloy materials are shown in figure 6. The sample size was designed as: the rare earth magnesium alloy cylinder has the diameter of 6mm and the height of 12 mm; the high-temperature alloy GH4169 comprises a collar with the outer diameter of 12mm, the thickness of 3mm and the height of 12 mm.
(2) The press machine is selected as a Gleeble3800 thermal simulation testing machine, the tonnage of the press machine can meet the deformation condition, and the temperature control is accurate.
(3) Sample processing and welding thermocouple, respectively at two thermocouple I of rare earth magnesium alloy cylinder middle part surface welding, thermocouple interval 2 ~ 3mm, adopt split type design at high temperature alloy GH4169 canning ring, offer the temperature-controlled groove in the lower part side of the upper bag lantern ring, the groove width 3mm, degree of depth 1.5mm, the purpose of offering the temperature-controlled groove is: and leading out a thermocouple I welded on the surface of the rare earth magnesium alloy cylinder through a thermocouple I lead, welding two thermocouples II on the side surface of the lower wrapping sleeve ring, wherein the distance between the thermocouples is 2-3 mm, and leading out the thermocouples II through a thermocouple II lead.
(4) And (4) respectively connecting the thermocouple welded in the step (3) to a temperature measuring channel and a temperature controlling channel, wherein a thermocouple I on the rare earth magnesium alloy cylinder is connected to the temperature controlling channel, and a thermocouple II on the lower wrapping ring is connected to the temperature measuring channel.
(5) And respectively coating nickel-based high-temperature lubricants HW014 at two ends of the rare earth magnesium alloy cylinder and the high-temperature alloy wrapping ring to reduce the influence of friction force in the deformation process, and performing a wrapping compression experiment on a Gleeble3800 thermophysical simulation experiment machine. The experimental temperature is 400 ℃, the heating rate is 5 ℃/s, the heat preservation time is 5min, and the compressive strain rate is 0.01s-1And a deformation amount of 50%.
As shown in FIG. 6, the three axial degrees of stress generated by the internal material in the deformation process are-7 according to finite element simulation results, and the temperature test result in the deformation process is shown in FIG. 5.
Claims (7)
1. A sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control is characterized by comprising the following steps:
(1) sample design: determining the size of the sample, the material and the specification of the sheath ring by combining a finite element numerical simulation mode according to the hydrostatic pressure level required by the internal material;
(2) selecting a testing machine: selecting a tester or a press with corresponding tonnage according to the strength of the internal material, the strength of the material of the sheath ring and the deformation temperature;
(3) sample processing and welding thermocouple: processing the sample according to the size of the sample designed in the step (1), and respectively welding thermocouples on the surface of the sample and the sheath ring;
(4) connecting the thermocouple welded in the step (3) to a corresponding test channel and a corresponding control channel to realize the test and control of the temperature of the sample and the temperature of the sheath ring in the deformation process;
(5) and (3) carrying out deformation experiments on the step (2) testing machine or the pressing machine.
2. The method for designing and testing the sample to realize the high hydrostatic pressure and the accurate temperature and temperature measurement and control according to claim 1, wherein a wrapping ring is wrapped around the cylindrical sample, the wrapping ring is an upper wrapping ring and a lower wrapping ring which are arranged up and down, a temperature control groove is formed in the side face of the lower part of the upper wrapping ring, and the cylindrical sample is exposed at the temperature control groove.
3. The method for designing and testing the sample to realize the high hydrostatic pressure and the accurate temperature measurement and control according to claim 2, wherein the thermocouple I is welded on the surface of the cylindrical sample exposed at the temperature control groove, the thermocouple I is led out through a lead of the thermocouple I, the thermocouple II is welded on the side surface of the lower wrapping lantern ring, and the thermocouple II is led out through a lead of the thermocouple II.
4. The sample design and experiment method for achieving high hydrostatic pressure and accurate temperature measurement and control according to claim 2, wherein two thermocouples I are welded on the surface of the middle part of the cylindrical sample, the distance between the thermocouples is 2-4 mm, and the thermocouples I are connected to a temperature control channel.
5. The sample design and experiment method for achieving high hydrostatic pressure and accurate temperature measurement and control according to claim 2, wherein two thermocouples II are welded to the side face of the lower wrapping ring, the distance between the thermocouples is 2-4 mm, and the thermocouples II are connected to a temperature measurement channel.
6. The sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control according to claim 2, wherein the width of the temperature control groove is 2-4 mm, and the depth of the temperature control groove is 1-3 mm.
7. The method for designing and testing the sample to realize the high hydrostatic pressure and the accurate temperature measurement and control according to claim 1, wherein the high temperature lubricant is coated on the surfaces of the sample and the sheath ring to reduce the influence of the friction force in the deformation process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811173999.4A CN111024462A (en) | 2018-10-09 | 2018-10-09 | Sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control |
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| CN201811173999.4A CN111024462A (en) | 2018-10-09 | 2018-10-09 | Sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112480993A (en) * | 2020-12-02 | 2021-03-12 | 成都先进金属材料产业技术研究院有限公司 | High-temperature lubricant for thermal simulation experiment and preparation method thereof |
| CN113358693A (en) * | 2021-06-02 | 2021-09-07 | 西北有色金属研究院 | Method for testing beta transition temperature of titanium alloy |
| CN115266387A (en) * | 2022-09-27 | 2022-11-01 | 太原理工大学 | Mechanics experiment method and device for realizing negative stress triaxial degree through isostatic loading |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112480993A (en) * | 2020-12-02 | 2021-03-12 | 成都先进金属材料产业技术研究院有限公司 | High-temperature lubricant for thermal simulation experiment and preparation method thereof |
| CN112480993B (en) * | 2020-12-02 | 2022-05-24 | 成都先进金属材料产业技术研究院有限公司 | High-temperature lubricant for thermal simulation experiment and preparation method thereof |
| CN113358693A (en) * | 2021-06-02 | 2021-09-07 | 西北有色金属研究院 | Method for testing beta transition temperature of titanium alloy |
| CN113358693B (en) * | 2021-06-02 | 2024-03-22 | 西北有色金属研究院 | Method for testing beta transition temperature of titanium alloy |
| CN115266387A (en) * | 2022-09-27 | 2022-11-01 | 太原理工大学 | Mechanics experiment method and device for realizing negative stress triaxial degree through isostatic loading |
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Application publication date: 20200417 |