CN102507343B - Test piece for shape memory alloy pulling and twisting experiment, fixture and device therefor - Google Patents

Test piece for shape memory alloy pulling and twisting experiment, fixture and device therefor Download PDF

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Publication number
CN102507343B
CN102507343B CN201110309992.2A CN201110309992A CN102507343B CN 102507343 B CN102507343 B CN 102507343B CN 201110309992 A CN201110309992 A CN 201110309992A CN 102507343 B CN102507343 B CN 102507343B
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China
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test
test specimen
fixture
temperature control
control box
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Expired - Fee Related
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CN201110309992.2A
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CN102507343A (en
Inventor
彭向和
孙虎
陈斌
陈翔
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Chongqing University
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Chongqing University
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Abstract

The invention discloses a test piece for a shape memory alloy pulling and twisting experiment, a fixture and a device for the test piece. The test piece is in a cylindrical shape as a whole and comprises a test part arranged in the middle and connecting parts arranged at two ends of the test part, wherein the diameter of each connecting part is greater than that of the test part; each connecting part is provided with an outer thread; each connecting part is also provided with two inner steps with step faces parallel to the shaft line; and each step face is a plane. The device disclosed by the invention is capable of conveniently and quickly finishing mounting and fixing of the test piece, clamping and connecting the test piece stably and reliably, and well finishing the shape memory alloy pulling and twisting performance test, and is favorable for performance research of the shape memory alloy, and meanwhile, the device disclosed by the invention adopts novel fixture for realizing research on the traditional material test machine, so that the cost is greatly reduced, and the device has the characteristic of convenience in implementing.

Description

A kind of experiment of marmem tension-torsion test specimen, fixture and device thereof
Technical field
The present invention relates to tension-torsion Performance Testing Technology, especially relate to a kind of test specimen and device thereof that marmem is carried out to tension-torsion Performance Detection.
Background technology
Marmem is a kind of alloy with SME, belongs to a kind of new function material that integrates perception and drive.(the Shape Memory Alloys of marmem under heating power load, SMAs) distinctive thermoelastic martensitic transformation is given its unusual characteristic, as SME (Shape Memory Effect, SME) and pseudoelasticity (Pseudoelastisity, PE) etc.These characteristics make marmem be applied widely at industry, national defence, instrument and medical field.
In order to be familiar with better the characteristic of marmem, to the tension-torsion performance of marmem and shape restorability research experiment, significant.
In prior art, the equipment for detection of various metal tension-torsion performances of existence, majority is for common metal, test test specimen is not had to specific (special) requirements, therefore for the ease of the installation of test test specimen, the size of its test specimen and fixture all arranges greatlyr, the most forms that adopt flange plate structure of fixture.The MTS(material testing SYSTEM material testing system of producing such as American MTS systems Corporation company) operating system (product type MTS 858/material testing system 858/MTS 858 universal testing machines) just belongs to this equipment.But be because cost is more expensive for marmem one, the 2nd, because self performance is special, so need to make the test specimen that becomes reduced size (general test section adopts the round tube shape of diameter 5mm left and right), then be combined with temperature controlled measure, could detect exactly its tension-torsion performance like this, and the function of recovering under high temperature.Also the equipment that exists some can detect small-size test piece tension-torsion performance in prior art, but all have defect with high costs, and same and be not suitable for having the tension-torsion performance test of the marmem of specific function.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention is: a kind of test specimen that is exclusively used in the performance test of marmem tension-torsion is provided, a kind of fixture and device that is applicable to this test specimen is provided simultaneously, based on described test specimen, fixture and device, can complete quickly and easily the installation of test specimen and fix, can complete the performance test of marmem tension-torsion.
In order to solve the problems of the technologies described above, in the present invention, adopted following technical scheme:
A kind of marmem tension-torsion experiment test specimen, its feature is, test specimen is cylindrical on the whole, comprise a connecting portion that is positioned at middle test department and is positioned at test department two ends, connecting portion diameter is greater than test department diameter, on described connecting portion, be provided with external thread, also have the interior step that two step surfaces parallel with axis on each connecting portion, described step surface is plane.
In this test specimen, connecting portion adopts external thread to connect, can be so that connection is very convenient, the testing requirements of in the time of can meeting test simultaneously, test specimen being drawn, being pressed, in adopting, step is realized pushing against and can be made to push against firm, does not stay the gap of rotation, the requirement of while meeting test, test specimen being reversed.
The present invention also provides a kind of marmem tension-torsion laboratory holder, its feature is, fixture is cylindrical on the whole, its one end has a coaxial ring flange arranging, the other end has a coaxial endoporus arranging, in endoporus, have the internal thread mating with external thread on above-mentioned test specimen, the both sides of endoporus also have two puller bolts that are oppositely arranged, and one end that puller bolt is screwed on fixture and inwards rotationally by screw thread is the hold out against plane vertical with puller bolt axis.
This fixture and above-mentioned test specimen coordinate, during assembling, by threaded engagement, the connecting portion of test specimen is screwed in fixture endoporus, then two of fixture puller bolts screw in and are pushed against on the step surface of test specimen connecting portion, after the step surface laminating that holds out against plane and test specimen of puller bolt end pushes against, can prevent well that test specimen from rotating again, therefore can meet well the installation of test specimen and fix, the ring flange simultaneously arranging can easily be fixed on fixture in existing Material Testing Machine cheaply quickly, to realize the detection to the tension-torsion performance of marmem.
The present invention also provides a kind of marmem tension-torsion experimental provision, comprise a Material Testing Machine, described Material Testing Machine has a worktable, worktable below has lower mounting flange, worktable top has upper mounting flange, described Material Testing Machine also has tension-torsion performance detecting system, its feature is, also comprise temperature control equipment and two above-mentioned fixtures, described temperature control equipment comprises guide rail and temperature control box, one end of guide rail extends to worktable top, temperature control box is assemblied on guide rail by roller slidably, the upper and lower two ends of temperature control box respectively offer a relative through hole, described two fixtures can pass and lean on the ring flange of self to be connected to a fixed with lower mounting flange and the upper mounting flange of Material Testing Machine respectively by each lower through-hole on temperature control box.
In this device, adopt the existing Material Testing Machine with tension-torsion Performance Detection function to be the theme, this testing machine is the equipment of employing ring flange as jockey, and its low price is with low cost.And then set up a temperature control box, by guide rail, temperature control box and Material Testing Machine are combined, in the time of need to doing marmem test, temperature control box is pushed into worktable top, can meet the temperature controlled requirement of test specimen, after test, temperature control box is passed and to be opened, still can be as the use of the tension-torsion performance test of plain metal large scale test specimen.When this device is tested for marmem, first by temperature control box as for worktable top, again two fixtures are adopted and are bolted on the ring flange of Material Testing Machine through the through hole on temperature control box, and then test specimen is assembled on the fixture in temperature control box, complete installation, then the tension-torsion performance detecting system having by Material Testing Machine self, the trace routine according to setting, can complete the detection to marmem tension-torsion performance.In testing process, by the temperature to temperature control box, control, can meet the testing requirements to marmem temperature variation.Wherein, described Material Testing Machine and temperature control box are separately ripe prior art and product, therefore not at this detailed description.
In sum, the present invention can complete quickly and easily the installation of test specimen and fix, and is clamped and connected reliable and stable, can complete well the performance test of marmem tension-torsion.The performance study that is conducive to marmem, apparatus of the present invention adopt new fixture to realize research in existing Material Testing Machine simultaneously, therefore greatly reduce cost, have advantages of that enforcement is cheap.The present invention simultaneously can also be applied to the tension-torsion performance study of other small-size test piece.
Accompanying drawing explanation
Fig. 1 is test specimen structural representation of the present invention.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the structural representation of test specimen, fixture and temperature control box in the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, structure of the present invention is described in further detail.
During concrete enforcement, as depicted in figs. 1 and 2, a kind of marmem tension-torsion experiment test specimen, test specimen is cylindrical (can for solid or hollow) on the whole, comprise a connecting portion 2 that is positioned at middle test department 1 and is positioned at test department 1 two ends, connecting portion 2 diameters are greater than test department diameter, on described connecting portion 2, are provided with external thread, on each connecting portion 2, also have the interior step 3 that two step surfaces parallel with axis, described step surface is plane.
During concrete enforcement, the diameter of described test department generally adopts 4-7mm left and right, wherein can adopt higher size during hollow tubular test specimen, adopts size on the low side when solid; During enforcement, screw thread adopts M14 * 1-6g(hollow tubular) screw thread or M10 * 1-6g(solid tubes) screw thread.During enforcement, pressing from both sides helicoid size can adjust according to the performance requirement of test specimen, and while only needing to meet test, screw thread can bear the power size of equipment tension and compression.
The present invention also provides a kind of marmem tension-torsion laboratory holder, as shown in Figure 3, fixture is cylindrical on the whole, its one end has a coaxial ring flange 4 arranging, the other end has a coaxial endoporus 5 arranging, in endoporus 5, have the internal thread mating with external thread on above-mentioned test specimen, the both sides of endoporus also have two puller bolts 6 that are oppositely arranged, and one end that puller bolt 6 is screwed on fixture and inwards rotationally by screw thread is the hold out against plane vertical with puller bolt axis.In Fig. 3, label 7 is test specimen as above, and label 8 is temperature control box (adopting the existing electric control box device with temp. control function).
The present invention also provides a kind of marmem tension-torsion experimental provision, comprise a Material Testing Machine (adopting the universal testing machine of the product type MTS 858/material testing system 858/MTS 858 described in background technology in this embodiment), this Material Testing Machine has a worktable, worktable below has lower mounting flange, worktable top has upper mounting flange, described Material Testing Machine also has tension-torsion performance detecting system, also comprise temperature control equipment and two above-mentioned fixtures, described temperature control equipment comprise guide rail and temperature control box (temperature control box as shown in Figure 38, be the electric control box device with temp. control function, belong to prior art, therefore do not describe in detail), one end of guide rail extends to worktable top, temperature control box is assemblied on guide rail by roller slidably, the upper and lower two ends of temperature control box respectively offer a relative through hole, described two fixtures can pass and lean on the ring flange of self to be connected to a fixed with lower mounting flange and the upper mounting flange of Material Testing Machine respectively by each lower through-hole on temperature control box.
When this device is tested for marmem, first by temperature control box as for worktable top, again two fixtures are adopted and are bolted on the ring flange of Material Testing Machine through the through hole on temperature control box, and then test specimen is assembled on the fixture in temperature control box, complete installation, then the tension-torsion performance detecting system having by Material Testing Machine self, the trace routine according to setting, can complete the detection to marmem tension-torsion performance.In testing process, by the temperature to temperature control box, control, can meet the testing requirements to marmem temperature variation.
Device of the present invention is not only applicable to the performance test of marmem, also can also be applied to the tension-torsion performance study of other small-size test piece.

Claims (3)

1. a marmem tension-torsion is tested test specimen, it is characterized in that, test specimen is cylindrical on the whole, comprise a connecting portion that is positioned at middle test department and is positioned at test department two ends, connecting portion diameter is greater than test department diameter, on described connecting portion, be provided with external thread, on each connecting portion, also there is the interior step that two step surfaces parallel with axis, described step surface is plane, described step surface is for pushing against with the plane laminating that holds out against of puller bolt end, during assembling, by threaded engagement, the connecting portion of test specimen is screwed in fixture endoporus, the both sides of endoporus also have two puller bolts that are oppositely arranged, one end that puller bolt is screwed on fixture and inwards rotationally by screw thread is the hold out against plane vertical with puller bolt axis, two puller bolts of fixture screw in and are pushed against on the step surface of test specimen connecting portion, to prevent that test specimen from rotating, the diameter of described test department is 4-7mm, and test specimen is hollow tubular or solid tubes, and during hollow tubular, screw thread adopts the screw thread of M14 * 1-6g, and during solid tubes, screw thread adopts the screw thread of M10 * 1-6g.
2. a marmem tension-torsion laboratory holder, it is characterized in that, fixture is cylindrical on the whole, its one end has a coaxial ring flange arranging, the other end has a coaxial endoporus arranging, in endoporus, there is the internal thread mating with external thread on test specimen claimed in claim 1, the both sides of endoporus also have two puller bolts that are oppositely arranged, one end that puller bolt is screwed on fixture and inwards rotationally by screw thread is the hold out against plane vertical with puller bolt axis, the described plane that holds out against pushes against for the step surface laminating with test specimen, to prevent that test specimen from rotating.
3. a marmem tension-torsion experimental provision, comprise a Material Testing Machine, described Material Testing Machine has a worktable, worktable below has lower mounting flange, worktable top has upper mounting flange, described Material Testing Machine also has tension-torsion performance detecting system, it is characterized in that, also comprise temperature control equipment and two fixtures as claimed in claim 2, described temperature control equipment comprises guide rail and temperature control box, one end of guide rail extends to worktable top, temperature control box is assemblied on guide rail by roller slidably, the upper and lower two ends of temperature control box respectively offer a relative through hole, described two fixtures can pass and lean on the ring flange of self to be connected to a fixed with lower mounting flange and the upper mounting flange of Material Testing Machine respectively by each lower through-hole on temperature control box.
CN201110309992.2A 2011-10-13 2011-10-13 Test piece for shape memory alloy pulling and twisting experiment, fixture and device therefor Expired - Fee Related CN102507343B (en)

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CN203849088U (en) * 2014-05-15 2014-09-24 深圳大学 Shape memory performance tester
CN105223225A (en) * 2015-10-08 2016-01-06 同济大学 A kind of test macromolecular material shape-memory properties device, method of testing and application thereof
CN105372125B (en) * 2015-12-23 2018-02-23 济南科汇试验设备有限公司 A kind of torsion testing machine clamp fixture and its application method
CN107024383B (en) * 2017-04-10 2019-03-12 青岛科技大学 A kind of thermoplastic sulfurized rubber compression stress relaxation can reverse recovery behavior characterizing method
CN109387414B (en) * 2018-12-19 2020-03-24 东北大学 Device and method capable of preparing artificial samples of hydraulic fracturing experiments of various sizes

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