CN109946180B - Pulse force loading device and method suitable for unidirectional tensile test of metal pipe fitting - Google Patents
Pulse force loading device and method suitable for unidirectional tensile test of metal pipe fitting Download PDFInfo
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- CN109946180B CN109946180B CN201910204474.0A CN201910204474A CN109946180B CN 109946180 B CN109946180 B CN 109946180B CN 201910204474 A CN201910204474 A CN 201910204474A CN 109946180 B CN109946180 B CN 109946180B
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- 239000002184 metal Substances 0.000 title claims abstract description 74
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 74
- 238000011068 loading method Methods 0.000 title claims abstract description 28
- 238000009864 tensile test Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title abstract description 11
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 6
- 230000009471 action Effects 0.000 description 6
- 239000004917 carbon fiber Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000010998 test method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
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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
- G01N2203/0017—Tensile
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
Abstract
A pulse force loading device and method suitable for a metal pipe fitting unidirectional tensile test are disclosed, wherein a first annular magnetic yoke is positioned at the upper end of a metal pipe fitting to be tested, and a second annular magnetic yoke is positioned at the lower end of the metal pipe fitting to be tested; the cross section of the first and second ring-shaped magnetic yokes is in a rectangular frame shape with a gap, a constant magnetic field coil is arranged in a cavity of the ring-shaped magnetic yoke, and the constant magnetic field coil is used for generating a radial constant magnetic field at the end part of the metal pipe to be tested. A pulse magnetic field coil is arranged in a cavity of the annular magnetic yoke and used for generating induced eddy current at the end part of the metal pipe to be tested; the pulse magnetic field coils are all provided with an axial through groove, and the positions of the through grooves correspond to the gaps of the annular magnet yokes. The invention can provide uniform unidirectional stretching electromagnetic force for the metal pipe fitting to be tested; because no clamping point exists, the phenomenon of stress concentration of the clamping point does not exist; meanwhile, loading with different strain rates can be realized by changing the pulse width of the electromagnetic force.
Description
Technical Field
The invention belongs to the field of metal material testing, and particularly relates to a pulse force loading device and method suitable for a metal pipe fitting unidirectional tensile test, which are mainly used for a metal plate bidirectional tensile test.
Background
The test result of the unidirectional tensile test of the metal pipe fitting not only can optimize the product design, but also can be used for detecting the product quality. In the existing metal pipe fitting one-way tensile test, the following problems exist by adopting mechanical force loading: stress concentration exists at the mechanical clamping force application point, and the unidirectional tensile test result can be influenced; the loading speed is low, the quasi-static loading is realized, and the properties of the unidirectional tensile material under high strain rate cannot be simulated.
The chinese patent "a drawing method of large-size metal pipe" (CN 106424176 a) "discloses a drawing method of large-size metal pipe, which adopts a circular groove on an auxiliary groove to make the two ends of the metal pipe not easy to deform the part of the metal pipe not provided with the auxiliary groove in the process of beating and tightening. However, with mechanical loading there is an inevitable concentration of stress at the clamping point.
The Chinese patent 'carbon fiber reinforced resin matrix thin-wall composite pipe tensile property test method (CN 105403457B)' discloses a carbon fiber reinforced resin matrix thin-wall composite pipe tensile property test method, wherein a mechanical tensile test piece of the carbon fiber reinforced resin matrix thin-wall composite pipe is prepared by adopting a glue joint technology to replace a mechanical joint technology, a switching clamp is designed to clamp the tensile test piece on a mechanical testing machine, then the tensile test piece is loaded, and finally the breaking load and the corresponding deformation value are obtained. The invention solves the problem that the existing method for testing the mechanical property of the carbon fiber reinforced resin matrix composite pipe is not suitable for a thin-wall composite pipe, avoids the problem that a metal joint damages the pipe due to mechanical connection by adopting a novel tensile test piece preparation method, and provides a novel test method for the carbon fiber thin-wall composite pipe. However, this method is only suitable for carbon fiber materials and is not suitable for metal pipes.
Disclosure of Invention
The invention provides a pulse force loading device and method suitable for a metal pipe fitting unidirectional tensile test, which can provide uniform unidirectional tensile electromagnetic force for a metal pipe fitting to be tested; because no clamping point exists, the phenomenon of stress concentration of the clamping point does not exist; meanwhile, loading with different strain rates can be realized by changing the pulse width of the electromagnetic force.
The technical scheme adopted by the invention is as follows:
the utility model provides a pulse force loading device suitable for unidirectional tensile test of tubular metal resonator, includes:
the first annular magnetic yoke is positioned at the upper end of the metal pipe fitting to be tested, and the second annular magnetic yoke is positioned at the lower end of the metal pipe fitting to be tested;
the cross section of the first and second ring-shaped magnetic yokes is in a rectangular frame shape with a gap, the gap of the first ring-shaped magnetic yoke is arranged at the lower side of the rectangular frame shape, and the gap of the second ring-shaped magnetic yoke is arranged at the upper side of the rectangular frame shape; the first and second ring-shaped magnetic yokes are used for forming a constant magnetic field magnetic loop;
a first constant magnetic field coil is arranged in a cavity of the first annular magnetic yoke, and a second constant magnetic field coil is arranged in a cavity of the second annular magnetic yoke; the first constant magnetic field coil and the second constant magnetic field coil are used for generating a radial constant magnetic field at the end part of the metal pipe fitting to be tested; the first constant magnetic field coil and the second constant magnetic field coil are respectively connected with a first direct current power supply and a second direct current power supply;
a first pulse magnetic field coil is arranged in a cavity of the first annular magnetic yoke, and a second pulse magnetic field coil is arranged in a cavity of the second annular magnetic yoke; the first and second pulse magnetic field coils are used for generating induced eddy currents at the end part of the metal pipe fitting to be tested; the first pulse magnetic field coil and the second pulse magnetic field coil are both provided with an axial through groove, and the positions of the through grooves correspond to the gaps of the annular magnetic yokes; the first pulse magnetic field coil and the second pulse magnetic field coil are respectively connected with a first pulse power supply and a second pulse power supply.
The width of the gap is 0.2-0.5mm larger than the wall thickness of the metal pipe fitting to be tested.
The first and second ring-shaped magnetic yokes are formed by laminating insulating silicon steel sheets with the thickness of 0.2 mm.
The first constant magnetic field coil is close to the upper region inside the first annular magnetic yoke, and the second constant magnetic field coil is close to the lower region inside the cavity of the second annular magnetic yoke.
The metal pipe fitting to be tested is a circular pipe fitting; the thickness of the metal pipe fitting to be tested is 2-5 mm; the upper end and the lower end of the metal pipe fitting to be tested are respectively positioned in the gap between the first annular magnetic yoke 3.1 and the second annular magnetic yoke, and the central axes of the metal pipe fitting to be tested and the annular magnetic yoke coincide.
A pulse force loading method suitable for unidirectional tensile test of a metal pipe fitting comprises the steps that the upper end and the lower end of the metal pipe fitting to be tested are respectively arranged in a gap of a first annular magnetic yoke and a gap of a second annular magnetic yoke, and are overlapped with the central axes of two sets of annular magnetic yokes;
a direct current power supply is adopted to supply power to the first constant magnetic field coil and the second constant magnetic field coil, a constant magnetic field is generated in the annular magnetic yoke and the gap, and the constant magnetic field in the metal pipe fitting to be tested at the gap is a radial component;
a pulse power supply is adopted to supply power to the first pulse magnetic field coil and the second pulse magnetic field coil to generate pulse current and a changing magnetic field, and the changing magnetic field generates toroidal induced eddy current in the metal pipe fitting to be tested;
the radial constant magnetic field interacts with the annular induced eddy current to generate axial pulse electromagnetic force; the upper end of the metal pipe fitting to be tested is subjected to upward axial electromagnetic force, and the lower end of the metal pipe fitting to be tested is subjected to downward axial electromagnetic force at the same moment, so that the unidirectional tensile test is completed.
The action of a radial outward constant magnetic field and clockwise annular induced eddy current generates upward axial electromagnetic force; or the action of a constant magnetic field in the radial direction and the annular induced eddy current in the counterclockwise direction generates upward axial electromagnetic force.
A radial outward constant magnetic field and counterclockwise annular induced eddy current act to generate downward axial electromagnetic force; or the action of a constant magnetic field in the radial direction and the toroidal induced eddy current in the clockwise direction generates downward axial electromagnetic force.
The loading of different strain rates can be realized by adjusting the capacitance of the pulse power supply and the inductance of the pulse magnetic field coil.
The voltage of the direct current power supply and the pulse current of the pulse magnetic field coil are adjusted, and loading of different electromagnetic force sizes can be achieved.
The invention relates to a pulse force loading device and method suitable for a unidirectional tensile test of a metal pipe fitting, which have the advantages that:
1. the uniform unidirectional stretching electromagnetic force can be provided for the metal pipe fitting to be tested;
2. because no clamping point exists, the phenomenon of stress concentration of the clamping point does not exist;
3. meanwhile, loading with different strain rates can be realized by changing the pulse width of the electromagnetic force.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic cross-sectional view of a pulse force loading device 2/3 suitable for use in uniaxial tension tests of metal pipes.
Fig. 2 is a schematic diagram of a pulsed current flow of a pulsed magnetic field coil.
Wherein:
1.1-a first constant magnetic field coil, 1.2-a second constant magnetic field coil;
2.1-a first pulse magnetic field coil, 2.2-a second pulse magnetic field coil;
3.1-a first annular magnetic yoke, 3.2-a second annular magnetic yoke;
4.1-a first pulse power supply, 4.2-a second pulse power supply;
5.1-a first direct current power supply, 5.2-a second direct current power supply;
6-metal pipe fitting to be tested;
7-pulse current.
Detailed Description
The utility model provides a pulse force loading device suitable for unidirectional tensile test of tubular metal resonator, includes:
the first annular magnet yoke 3.1 is positioned at the upper end of the metal pipe fitting 6 to be tested, and the second annular magnet yoke 3.2 is positioned at the lower end of the metal pipe fitting 6 to be tested;
the cross section of the first and second ring-shaped magnetic yokes is in a rectangular frame shape with a gap, the gap of the first ring-shaped magnetic yoke 3.1 is arranged at the lower side of the rectangular frame shape, and the gap of the second ring-shaped magnetic yoke 3.2 is arranged at the upper side of the rectangular frame shape; the first and second ring-shaped magnetic yokes are used for forming a constant magnetic field magnetic loop;
a first constant magnetic field coil 1.1 is arranged in a cavity of the first annular magnetic yoke 3.1, and a second constant magnetic field coil 1.2 is arranged in a cavity of the second annular magnetic yoke 3.2; the first and second constant magnetic field coils are used for generating a radial constant magnetic field at the end part of the metal pipe fitting 6 to be tested; the first constant magnetic field coil 1.1 and the second constant magnetic field coil 1.2 are respectively connected with a first direct current power supply 5.1 and a second direct current power supply 5.2;
a first pulse magnetic field coil 2.1 is arranged in a cavity of the first annular magnetic yoke 3.1, and a second pulse magnetic field coil 2.2 is arranged in a cavity of the second annular magnetic yoke 3.2; the first and second pulse magnetic field coils are used for generating induced eddy currents at the end part of the metal pipe fitting 6 to be tested; the first pulse magnetic field coil and the second pulse magnetic field coil are both provided with an axial through groove, and the positions of the through grooves correspond to the gaps of the annular magnetic yokes; the first pulse magnetic field coil 2.1 and the second pulse magnetic field coil 2.2 are respectively connected with a first pulse power supply 4.1 and a second pulse power supply 4.2.
The width of the gap is 0.2-0.5mm larger than the wall thickness of the metal pipe fitting 6 to be tested. The metal pipe fitting 6 to be tested is arranged in the gap conveniently, so that the width of the gap is larger than the thickness of the metal pipe fitting 6 to be tested, meanwhile, the large degree cannot be too large, the leakage magnetic flux is more due to the fact that the gap is too large, and the electromagnetic force is weakened.
The first and second ring-shaped magnetic yokes are formed by laminating insulating silicon steel sheets with the thickness of 0.2 mm. The first and second ring-shaped magnetic yokes are laminated by insulating silicon steel sheets with the thickness of 0.2mm, so that no induced eddy current exists in the first and second ring-shaped magnetic yokes, and the loss is reduced. The cost increases when the silicon steel sheet is too thin, and the loss increases when the silicon steel sheet is too thick.
The first and second constant magnetic field coils are both traditional coils and are formed by winding copper wires, and the geometric dimension of the coil is limited by the fact that the coil can be simultaneously placed inside a rectangular frame of the first and second ring-shaped magnetic yokes with the first and second pulse magnetic field coils.
The first and second pulse magnetic field coils are both traditional coils and are formed by winding copper wires, and the geometric dimension of the first and second pulse magnetic field coils is limited by the fact that the first and second pulse magnetic field coils can be placed inside the rectangular frame of the first and second ring-shaped magnetic yokes.
The first and second DC power supplies adopt a DC storage battery 400V.
The first pulse power supply and the second pulse power supply adopt a pulse capacitor 100 uF.
The first constant magnetic field coil 1.1 is close to the upper region inside the cavity of the first ring-shaped magnetic yoke 3.1, and the second constant magnetic field coil 1.2 is close to the lower region inside the cavity of the second ring-shaped magnetic yoke 3.2.
The metal pipe fitting 6 to be tested is a circular pipe fitting; the thickness of the metal pipe fitting 6 to be tested is 2-5 mm; the upper end and the lower end of the metal pipe fitting 6 to be tested are respectively positioned in the gap between the first annular magnetic yoke 3.1 and the second annular magnetic yoke 3.2, and the central axes of the metal pipe fitting 6 to be tested and the annular magnetic yokes coincide.
A pulse force loading method suitable for a unidirectional tensile test of a metal pipe fitting,
respectively arranging the upper end and the lower end of a metal pipe fitting 6 to be tested in the gap of the first annular magnetic yoke 3.1 and the gap of the second annular magnetic yoke 3.2, and enabling the upper end and the lower end to be superposed with the central axes of the two annular magnetic yokes;
a direct current power supply is adopted to supply power to the first constant magnetic field coil and the second constant magnetic field coil, a constant magnetic field is generated in the annular magnetic yoke and the gap, and the constant magnetic field in the metal pipe fitting 6 to be tested at the gap is a radial component; the constant magnetic field at this time is dominated by the radial direction, ignoring the axial component.
A pulse power supply is adopted to supply power to the first pulse magnetic field coil and the second pulse magnetic field coil to generate pulse current and a changing magnetic field, and the changing magnetic field generates toroidal induced eddy current in the metal pipe fitting 6 to be tested;
the radial constant magnetic field interacts with the toroidal induced eddy currents to produce an axial pulsed electromagnetic force F = jxb, i.e. the current and field effects can produce a force, where the radial constant magnetic field interacts with the toroidal induced eddy currents to produce an axial downward or upward pulsed electromagnetic force. The upper end of the metal pipe fitting 6 to be tested is subjected to the upward axial electromagnetic force, and the lower end of the metal pipe fitting 6 to be tested is subjected to the downward axial electromagnetic force at the same time, so that the unidirectional tensile test is completed.
The action of a radial outward constant magnetic field and clockwise annular induced eddy current generates upward axial electromagnetic force; or the action of a constant magnetic field in the radial direction and the annular induced eddy current in the counterclockwise direction generates upward axial electromagnetic force.
A radial outward constant magnetic field and counterclockwise annular induced eddy current act to generate downward axial electromagnetic force; or the action of a constant magnetic field in the radial direction and the toroidal induced eddy current in the clockwise direction generates downward axial electromagnetic force.
The loading of different strain rates can be realized by adjusting the capacitance of the pulse power supply and the inductance of the pulse magnetic field coil. The capacitor of the pulse power supply and the inductor of the pulse magnetic field coil can change the pulse width of the electromagnetic force, and the faster the pulse width is, the faster the change rate is, the faster the strain rate loading can be realized.
The voltage of the direct current power supply and the pulse current of the pulse magnetic field coil are adjusted, and loading of different electromagnetic force sizes can be achieved. The magnitude of the electromagnetic force is in direct proportion to the magnitude of the constant magnetic field by the induced eddy current, the constant magnetic field can be changed by adjusting the voltage of the direct current power supply, and the induced eddy current can be changed by adjusting the pulse current of the pulse magnetic field coil, so that the loading of different electromagnetic forces can be realized.
Example (b):
according to the figure 1, two ends of a metal pipe fitting 6 to be tested are respectively arranged in the gap between the first and second annular magnetic yokes and are superposed with the central axes of the two annular magnetic yokes; a first direct current power supply 5.1 and a second direct current power supply 5.2 are adopted to respectively supply power to the first constant magnetic field coil and the second constant magnetic field coil, a constant magnetic field is generated in the annular magnetic yoke and the gap, and the constant magnetic field in the metal pipe fitting 6 to be tested at the gap is a radial component;
a first pulse power supply 4.1 and a second pulse power supply 4.2 are adopted to respectively supply power to a first pulse magnetic field coil 2.1 and a second pulse magnetic field coil 2.2 to generate pulse current 7 and a changing magnetic field, and the changing magnetic field generates toroidal induced eddy current in a metal pipe fitting 6 to be tested;
the radial constant magnetic field interacts with the annular induced eddy current to generate axial pulse electromagnetic force; the upper end of the metal pipe fitting 6 to be tested is subjected to the upward axial electromagnetic force, and the lower end of the metal pipe fitting 6 to be tested is subjected to the downward axial electromagnetic force at the same time, so that the unidirectional tensile test is completed.
Claims (4)
1. The utility model provides a pulse force loading device suitable for unidirectional tension test of metal pipe fitting which characterized in that includes:
a first annular magnet yoke (3.1) positioned at the upper end of the metal pipe fitting (6) to be tested and a second annular magnet yoke (3.2) positioned at the lower end of the metal pipe fitting (6) to be tested;
the upper end and the lower end of the metal pipe fitting (6) to be tested are respectively positioned in the gap between the first annular magnetic yoke (3.1) and the second annular magnetic yoke (3.2), and the central axes of the metal pipe fitting (6) to be tested and the annular magnetic yoke are superposed;
the cross sections of the first and second ring-shaped magnetic yokes are in a rectangular frame shape with a gap, the gap of the first ring-shaped magnetic yoke (3.1) is arranged at the lower side of the rectangular frame shape, and the gap of the second ring-shaped magnetic yoke (3.2) is arranged at the upper side of the rectangular frame shape; the first and second ring-shaped magnetic yokes are used for forming a constant magnetic field magnetic loop;
a first constant magnetic field coil (1.1) is arranged in a cavity of the first annular magnetic yoke (3.1), and a second constant magnetic field coil (1.2) is arranged in a cavity of the second annular magnetic yoke (3.2); the first constant magnetic field coil and the second constant magnetic field coil are used for generating a radial constant magnetic field at the end part of the metal pipe fitting (6) to be tested; the first constant magnetic field coil (1.1) and the second constant magnetic field coil (1.2) are respectively connected with a first direct current power supply (5.1) and a second direct current power supply (5.2);
a first pulse magnetic field coil (2.1) is arranged in a cavity of the first annular magnetic yoke (3.1), and a second pulse magnetic field coil (2.2) is arranged in a cavity of the second annular magnetic yoke (3.2); the first and second pulse magnetic field coils are used for generating induced eddy currents at the end part of the metal pipe fitting (6) to be tested; the first pulse magnetic field coil and the second pulse magnetic field coil are both provided with an axial through groove, and the positions of the through grooves correspond to the gaps of the annular magnetic yokes; the first pulse magnetic field coil (2.1) and the second pulse magnetic field coil (2.2) are respectively connected with the first pulse power supply (4.1) and the second pulse power supply (4.2).
2. The impulse force loading device suitable for the unidirectional tensile test of the metal pipe fitting according to claim 1, characterized in that: the width of the gap is 0.2-0.5mm larger than the wall thickness of the metal pipe fitting (6) to be tested.
3. The impulse force loading device suitable for the unidirectional tensile test of the metal pipe fitting according to claim 1, characterized in that: the first and second ring-shaped magnetic yokes are formed by laminating insulating silicon steel sheets with the thickness of 0.2 mm.
4. The impulse force loading device suitable for the unidirectional tensile test of the metal pipe fitting according to claim 1, characterized in that: the first constant magnetic field coil (1.1) is close to the upper region in the first annular magnetic yoke (3.1), and the second constant magnetic field coil (1.2) is close to the lower region in the second annular magnetic yoke (3.2).
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| CN201910204474.0A CN109946180B (en) | 2019-03-18 | 2019-03-18 | Pulse force loading device and method suitable for unidirectional tensile test of metal pipe fitting |
| CN202110592683.4A CN113340730A (en) | 2019-03-18 | 2019-03-18 | Pulse force loading method suitable for unidirectional tensile test of metal pipe fitting |
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| CN102109436B (en) * | 2010-12-24 | 2013-10-23 | 江苏大学 | Electromagnetic impact dynamic tensile test method and device |
| CN103406418B (en) * | 2013-08-05 | 2015-01-07 | 三峡大学 | Method and device for electromagnetically forming metal pipe fitting in radial and axial loading mode |
| CN203643262U (en) * | 2013-12-16 | 2014-06-11 | 河海大学 | Direct rock tension testing device loaded by electromagnetic force |
| CN107030172B (en) * | 2017-05-12 | 2018-08-21 | 华中科技大学 | A kind of electromagnetic casting method and device based on tubing under background magnetic field |
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