CN101975700A - Device for high temperature Hopkinson tensile test - Google Patents
Device for high temperature Hopkinson tensile test Download PDFInfo
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- CN101975700A CN101975700A CN 201010516125 CN201010516125A CN101975700A CN 101975700 A CN101975700 A CN 101975700A CN 201010516125 CN201010516125 CN 201010516125 CN 201010516125 A CN201010516125 A CN 201010516125A CN 101975700 A CN101975700 A CN 101975700A
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Abstract
The invention discloses a device for a high temperature Hopkinson tensile test. The device is characterized by comprising a set of current heating and controlling system, wherein the current heating and controlling system comprises a current rapid heater, a temperature controller, heating chucks, an on-off device and a thermocouple; the heating chucks are clamped at both ends of an experimental section of a test piece and are connected with the current rapid heater respectively through copper conductors; the thermocouple is fixedly connected to the experimental section of the test piece and is connected with the temperature controller; and the temperature controller is connected with the current rapid heater through the on-off device and controls the heating process of the current rapid heater. The device is suitable for a metal test piece, and can heat under the action of currents based on the conductive properties of the metal test piece to realize self-heating. When the device is used for the test, heating is realized rapidly, the temperature rise of a waveguide rod is low, the influence of the temperature rise on the waveguide rod can be neglected, the device does not have impact on the test piece, the temperatures on the test piece are uniformly distributed, and the highest temperature which can be reached is greatly improved.
Description
Technical field
The invention belongs to material at high temperature dynamic mechanical experimental technique field, be specifically related to a kind of Hopkinson tensile test device that is used for the test of metal material high temperature dynamic mechanical.
Background technology
The mechanical property of material under the low rate of strain of mechanical property under the high rate of strain of high temperature and normal temperature is different, and separate type Hopkinson (Hopkinson) pull bar is to carry out MATERIALS ' DYNAMIC tensile mechanical properties research the most effective the most frequently used experimental facilities.Because separate type Hopkinson (Hopkinson) pull bar test specimen and waveguide rod when experimentizing must connect as one, the influence of heating waveguide rod when carrying out the high temperature experiment is difficult to avoid, thereby influences the accuracy and the validity of experimental result.Adopt rational type of heating, the thermograde in the reduction waveguide rod is one of focus of paying close attention in the Hopkinson stretching experiment to the influence of experimental result.Name is called the article (Tong Jingwei etc. of " temperature and rate of strain are to the research of high temperature aluminium alloys constitutive relation influence under the tensile load ", Experimental Mechanics, 1999,14 (4): 498～504) adopt electric furnace that test specimen and subwave guide rod are heated simultaneously, then waveguide rod is carried out the mode of thermograde correction, its shortcoming is the data processing more complicated.Name is called the article of " the quick contact in the high temperature impact stretching experiment adds temperature technique ", and (Zan is auspicious etc., Experimental Mechanics, 2005,20 (3): 321～327) the quick Contact Heating technology of the big thermal capacity thermal inertia of employing temperature rise, the contact process of its well heater and test specimen may produce side knock to test specimen, and the maximum temperature that reaches also is subjected to certain restriction.
Summary of the invention
In order to overcome data processing more complicated in the prior art, the contact process of well heater and test specimen produces side knock to test specimen, weakness such as the maximum temperature that reaches is restricted, the invention provides a kind of Hopkinson tensile test device that is used for the test of metal material high temperature dynamic mechanical, application the present invention experimentize, and heats rapidly, can ignore the influence of heating to waveguide rod, test specimen is not had impact, and the maximum temperature that can reach also is greatly improved.
The technical scheme that the present invention takes is: utilize the conductive characteristic of metal material, sample is applied electric current, metal specimen is generated heat under the function of current, realize from heating.A kind of high temperature Hopkinson tensile test device of the present invention comprises incident bar, transmission bar, test specimen, test macro, is characterized in: also comprise a cover current flow heats and a control system.Described current flow heats and control system comprise electric current rapid heater, temperature controller, heated chuck, break-make device and thermopair.Heated chuck is made up of heated chuck I that is held on test specimen experimental section two ends and heated chuck II, and links to each other with the electric current rapid heater by copper conductor respectively; Thermopair is fixedly connected on the test specimen experimental section, and links to each other as its input signal with temperature controller; The output terminal of temperature controller links to each other with the break-make device, and the other end of break-make device links to each other with the electric current rapid heater.
The heat energy that electric current rapid heater output current is changed mainly is made up of three parts: the heat energy that heat energy that the heat energy that produces in the well heater internal resistance, braiding copper conductor resistance produce and test specimen resistance produce.The internal resistance of well heater very I is ignored; The resistivity of common metal material is far above the resistivity of copper, and the braiding copper conductor sectional area that quick electric heater is drawn is much larger than the sectional area of test specimen itself, be directly proportional with the resistivity of material and the principle that is inversely proportional to the sectional area of material according to the size of resistance, the resistance of test specimen is far above the resistance of braiding copper conductor, and electric current is identical, so the heat energy that the well heater output current produces mainly concentrates on the test specimen, the temperature rise of the temperature rise of test specimen on the copper conductor.
Temperature controller is controlled heating process in the following manner: when the test specimen temperature that records when thermopair was lower than the experiment design temperature, temperature controller provided signal and makes electric current rapid heater output current, test specimen was realized from heating, the temperature rising under the function of current; After test specimen temperature that thermopair records reached the experiment design temperature, temperature controller provided the quick electric heater of signal controlling electric current and stops electric current output, thereby stopped to the test specimen heating test specimen insulation.
Test specimen among the present invention, heated chuck and thermopair are coated by asbestos after installation, reach insulation effect and also isolate with surrounding environment simultaneously.
Experimentation of the present invention is: by requirement of experiment corresponding test specimen is installed, heated chuck I and heated chuck II are held on the two ends of test specimen experimental section respectively, thermopair is fixed in the experimental section of test specimen, with asbestos above-mentioned part is wrapped up then, and finish they and being connected of temperature controller, break-make device, electric current rapid heater; Open experiment test system, the operation loading system, when loading system enters stable operation when waiting percussion, the firing current automotive quick-heat system heats test specimen; When the test specimen temperature reaches requirement of experiment, the percussion loading system, the stress wave that produces in the incident bar 1 is finished experiment to test specimen loadings that stretch, and the while loading system is blocked the break-make device, and the electric current rapid heater no longer heats test specimen.
The invention has the beneficial effects as follows: the uniformity of temperature profile on the test specimen, its deviation is less than 2%; Be confined to effective energization area of test specimen from heating, the temperature rise that all the other positions of test specimen and waveguide rod only have heat conduction to cause, owing to heat rapidly, heating process is extremely short, and the bonding employing high-temperature resistant structural adhesive of test specimen and waveguide rod, it is the poor conductor of heat, so the temperature rise of waveguide rod is very little, the temperature rise of its nearly test specimen end end is less than 100 ° of C when experimental temperature is 950 ° of C, and data processing can be ignored to heat the influence of waveguide rod be need not to revise; Experimentation does not have impact to test specimen, and the maximum temperature that test specimen can reach also is greatly improved, and can reach 1200 ° of C.
Description of drawings
Fig. 1 is the general structure synoptic diagram of a kind of high temperature Hopkinson tensile test device of the present invention.
Fig. 2 is heated chuck and the test specimen connection diagram of the embodiment 1 of a kind of high temperature Hopkinson tensile test device of the present invention.
Fig. 3 is heated chuck and the test specimen connection diagram of the embodiment 2 of a kind of high temperature Hopkinson tensile test device of the present invention.
Among the figure: 1. incident bar 2. transmission bars 3. hold-down supports 4. test specimens 5. column test specimens 11. heated chuck I 12. heated chuck II 13. thermocouples 14. temperature controllers 16. break-make devices 21. electric current rapid heaters 22. copper conductor I 23. copper conductor II 24. foil gauge I 31. foil gauge II 32. test macros 41. clamping plate I 42. clamping plate II 43. bolt I 44. bolt II 45. nut I 46. nut II 47. copper conductors 49. copper conductor head I 50. copper conductor head II 51. circular arc clamping plate I 52. circular arc clamping plate II.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Embodiment 1
Fig. 1 is the general structure synoptic diagram of a kind of high temperature Hopkinson tensile test device of the present invention.As can be seen from Figure 1, a kind of high temperature Hopkinson tensile test device of the present invention comprises incident bar 1, transmission bar 2, test specimen 4, test macro 33, is characterized in: also comprise a cover current flow heats and a control system.Described current flow heats and control system comprise electric current rapid heater 21, temperature controller 14, heated chuck, break-make device 16 and thermopair 13.Heated chuck is made up of the heated chuck I 11 and the heated chuck II 12 that are held on test specimen 4 experimental section two ends, and links to each other with electric current rapid heater 21 with copper conductor II 23 by copper conductor I 22 respectively; Thermopair 13 is fixedly connected on the experimental section of test specimen 4, and links to each other as its input signal with temperature controller 14; The output terminal of temperature controller 14 links to each other with break-make device 16, and the other end of break-make device 16 links to each other with electric current rapid heater 21.
Transmission bar 2 and 3 fastening linking to each other of hold-down support, restriction transmission bar 2 is to left movement.Test specimen 4 adopts high-temperature resistant structural adhesive with being connected of incident bar 1 and transmission bar 2, and it is the poor conductor of heat, can reduce the temperature rise of waveguide rod in the heating process.Paste foil gauge I 31 and foil gauge II 32 on incident bar 1 and the transmission bar 2 respectively, and link to each other, finish experiment test work jointly with test macro 33.
The test specimen of present embodiment is a plate test coupon.Fig. 2 is the connection diagram of heated chuck and test specimen in the present embodiment.Heated chuck comprises clamping plate I 41 and clamping plate II 42, two clamping plates is clipped in the middle test specimen 4, by bolt I 43 and nut I 45, bolt II 44 and nut II 46 two clamping plates is clamped, realize that simultaneously copper conductor head I 49 and copper conductor head II 50 are connected with the tight of heated chuck, and copper conductor head I 49 links to each other with copper conductor 47 all with copper conductor head II 50.
The experimentation of present embodiment is: by requirement of experiment corresponding test specimen 4 is installed, heated chuck I 11 and heated chuck II 12 are held on the two ends of test specimen 4 experimental sections respectively, thermopair 13 is fixed in the experimental section of test specimen 4, with asbestos above-mentioned part is wrapped up then, and finish they and being connected of temperature controller 14, break-make device 16, electric current rapid heater 21; Open experiment test system 33, the operation loading system, when loading system enters stable operation when waiting percussion, the firing current automotive quick-heat system gives test specimen 4 energisings, and test specimen 4 is realized under the function of current from heating; When test specimen 4 temperature reach requirement of experiment, the percussion loading system, the stress wave that produces in the incident bar 1 is finished experiment to test specimen 4 loadings that stretch, and the while loading system is blocked break-make device 16, and electric current rapid heater 21 no longer heats test specimen.
Embodiment 2
The difference of present embodiment and embodiment 1 is that test specimen is the column test specimen, and the clamping plate of supporting with it heated chuck are circular-arc.Fig. 3 is the connection diagram of heated chuck and test specimen in the present embodiment.Heated chuck comprises circular arc clamping plate I 51 and circular arc clamping plate II 52, two clamping plates is clipped in the middle column test specimen 5, by bolt I 43 and nut I 45, bolt II 44 and nut II 46 two clamping plates is clamped, realize that simultaneously copper conductor head I 49 and copper conductor head II 50 are connected with the tight of heated chuck, and copper conductor head I 49 links to each other with copper conductor 47 all with copper conductor head II 50.
Other parts and the experimentation of present embodiment are identical with embodiment 1.
Heated chuck of the present invention is copper.
Copper conductor of the present invention is the braiding copper conductor.
Claims (4)
1. high temperature Hopkinson tensile test device, described experimental provision comprises incident bar, transmission bar, test specimen, test macro, it is characterized in that: described experimental provision also comprises a cover current flow heats and a control system, and described current flow heats and control system contain electric current rapid heater (21), temperature controller (14), heated chuck, break-make device (16) and thermopair (13); Heated chuck is made up of heated chuck I (11) that is held on test specimen (4) experimental section two ends and heated chuck II (12), and links to each other with electric current rapid heater (21) with copper conductor II (23) by copper conductor I (22) respectively; Thermopair (13) is fixedly connected on the experimental section of test specimen (4), and links to each other as its input signal with temperature controller (14); The output terminal of temperature controller (14) links to each other with break-make device (16), and the other end of break-make device (16) links to each other with electric current rapid heater (21).
2. a kind of high temperature Hopkinson tensile test device according to claim 1 is characterized in that: described heated chuck is copper tabular clamping plate.
3. a kind of high temperature Hopkinson tensile test device according to claim 1 is characterized in that: described heated chuck is copper circular-arc clamping plate.
4. a kind of high temperature Hopkinson tensile test device according to claim 1 is characterized in that: described copper conductor is the braiding copper conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010516125 CN101975700B (en) | 2010-11-23 | 2010-11-23 | Device for high temperature Hopkinson tensile test |
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| CN 201010516125 CN101975700B (en) | 2010-11-23 | 2010-11-23 | Device for high temperature Hopkinson tensile test |
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| CN101975700A true CN101975700A (en) | 2011-02-16 |
| CN101975700B CN101975700B (en) | 2012-07-25 |
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| CN 201010516125 Expired - Fee Related CN101975700B (en) | 2010-11-23 | 2010-11-23 | Device for high temperature Hopkinson tensile test |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288497A (en) * | 2011-07-07 | 2011-12-21 | 中国人民解放军空军工程大学 | Heating device for Hopkinson pressure bar test |
| CN103454164A (en) * | 2013-09-13 | 2013-12-18 | 安徽理工大学 | Multi-field coupled coal rock impact loading experimental device and method |
| CN103674738A (en) * | 2013-12-13 | 2014-03-26 | 中国人民解放军理工大学 | Experimental device for automatically loading impacts on SHPB (Split Hopkinson Pressure Bar) at high temperature |
| CN103868802A (en) * | 2014-04-01 | 2014-06-18 | 湖南大学 | Hopkinson pressure bar experimental apparatus and testing method |
| CN109612803A (en) * | 2019-01-25 | 2019-04-12 | 中国工程物理研究院总体工程研究所 | It is a kind of for measuring the tensile test specimen of material dynamic performance |
| CN110686982A (en) * | 2019-10-17 | 2020-01-14 | 山东大学 | Cross double-pull comprehensive test platform and method suitable for high-temperature condition |
| CN110849737A (en) * | 2019-10-14 | 2020-02-28 | 北京航空航天大学 | Electric auxiliary single-pull test temperature control device and use method thereof |
| CN111366455A (en) * | 2020-05-09 | 2020-07-03 | 中国工程物理研究院总体工程研究所 | Test piece positioning and clamp cooling device for high-temperature dynamic stretching of precious metal |
| CN112964578A (en) * | 2021-02-05 | 2021-06-15 | 中山大学 | Dynamic composite loading incident rod |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082031A (en) * | 2000-09-05 | 2002-03-22 | Ishikawajima Harima Heavy Ind Co Ltd | Hopkinson bar testing apparatus |
| CN1888851A (en) * | 2006-06-02 | 2007-01-03 | 中国工程物理研究院总体工程研究所 | Bidirectional double-gas-path automatic assembling device for high-temperature Hopkinson pressure bar experiment |
| CN101666724A (en) * | 2009-09-25 | 2010-03-10 | 中国人民解放军国防科学技术大学 | General Hopkinson bar device for compression load and stretching load |
| CN201828465U (en) * | 2010-11-23 | 2011-05-11 | 中国工程物理研究院总体工程研究所 | High-temperature Hopkinson tension test device |
-
2010
- 2010-11-23 CN CN 201010516125 patent/CN101975700B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082031A (en) * | 2000-09-05 | 2002-03-22 | Ishikawajima Harima Heavy Ind Co Ltd | Hopkinson bar testing apparatus |
| CN1888851A (en) * | 2006-06-02 | 2007-01-03 | 中国工程物理研究院总体工程研究所 | Bidirectional double-gas-path automatic assembling device for high-temperature Hopkinson pressure bar experiment |
| CN101666724A (en) * | 2009-09-25 | 2010-03-10 | 中国人民解放军国防科学技术大学 | General Hopkinson bar device for compression load and stretching load |
| CN201828465U (en) * | 2010-11-23 | 2011-05-11 | 中国工程物理研究院总体工程研究所 | High-temperature Hopkinson tension test device |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288497B (en) * | 2011-07-07 | 2014-06-04 | 中国人民解放军空军工程大学 | Heating device for Hopkinson pressure bar test |
| CN102288497A (en) * | 2011-07-07 | 2011-12-21 | 中国人民解放军空军工程大学 | Heating device for Hopkinson pressure bar test |
| CN103454164B (en) * | 2013-09-13 | 2016-02-03 | 安徽理工大学 | Multi-scenarios method coal petrography impact loading experiment device and experimental technique |
| CN103454164A (en) * | 2013-09-13 | 2013-12-18 | 安徽理工大学 | Multi-field coupled coal rock impact loading experimental device and method |
| CN103674738A (en) * | 2013-12-13 | 2014-03-26 | 中国人民解放军理工大学 | Experimental device for automatically loading impacts on SHPB (Split Hopkinson Pressure Bar) at high temperature |
| CN103868802A (en) * | 2014-04-01 | 2014-06-18 | 湖南大学 | Hopkinson pressure bar experimental apparatus and testing method |
| CN103868802B (en) * | 2014-04-01 | 2015-11-25 | 湖南大学 | A kind of Hopkinson pull rod method of testing |
| CN109612803A (en) * | 2019-01-25 | 2019-04-12 | 中国工程物理研究院总体工程研究所 | It is a kind of for measuring the tensile test specimen of material dynamic performance |
| CN110849737A (en) * | 2019-10-14 | 2020-02-28 | 北京航空航天大学 | Electric auxiliary single-pull test temperature control device and use method thereof |
| CN110686982A (en) * | 2019-10-17 | 2020-01-14 | 山东大学 | Cross double-pull comprehensive test platform and method suitable for high-temperature condition |
| CN111366455A (en) * | 2020-05-09 | 2020-07-03 | 中国工程物理研究院总体工程研究所 | Test piece positioning and clamp cooling device for high-temperature dynamic stretching of precious metal |
| CN112964578A (en) * | 2021-02-05 | 2021-06-15 | 中山大学 | Dynamic composite loading incident rod |
| CN112964578B (en) * | 2021-02-05 | 2022-06-17 | 中山大学 | Dynamic composite loading incident rod |
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