CN111413216A - Electromechanical combined loading type Hopkinson torsion bar - Google Patents
Electromechanical combined loading type Hopkinson torsion bar Download PDFInfo
- Publication number
- CN111413216A CN111413216A CN202010311668.3A CN202010311668A CN111413216A CN 111413216 A CN111413216 A CN 111413216A CN 202010311668 A CN202010311668 A CN 202010311668A CN 111413216 A CN111413216 A CN 111413216A
- Authority
- CN
- China
- Prior art keywords
- torsion
- hopkinson
- torsion bar
- guide rail
- loading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011068 loading method Methods 0.000 title claims abstract description 48
- 238000004146 energy storage Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 210000001503 joint Anatomy 0.000 claims abstract description 8
- 241001669679 Eleotris Species 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 239000002360 explosive Substances 0.000 abstract description 10
- 238000002474 experimental method Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Images
Classifications
-
- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
-
- 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
-
- 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
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
-
- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic 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
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
-
- 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
- G01N2203/0025—Shearing
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an electromechanical combined loading type Hopkinson torsion bar.A guide rail is erected on a sleeper and is provided with a central bracket; the torsion incident rod and the torsion transmission rod are fixed on the guide rail through a central support arranged on the guide rail, and a test piece assembly is arranged between the torsion incident rod and the torsion transmission rod; one end of the guide rail close to the torsion incident rod is provided with a power system, which specifically comprises: the energy accumulator, the axial powerful butt joint system, the rotary power loading and control system, the rotary energy storage and release system, the circumferential rapid loading system and the torsion pulse shaper are sequentially connected together, and the torsion pulse shaper is connected with the torsion incident rod. The defects of the existing pre-stored energy type split Hopkinson torsion bar, an explosive driven Hopkinson torsion bar device, a T-shaped Hopkinson torsion bar device and a flywheel type Hopkinson torsion bar device are overcome, the experiment difficulty is greatly reduced, and the experiment efficiency is greatly improved.
Description
The technical field is as follows:
the invention belongs to the technical field of material dynamic mechanical property experimental equipment, and particularly relates to an electromechanical combined loading type Hopkinson torsion bar.
Background art:
the split Hopkinson bar is an effective experimental device for researching the dynamic mechanical property of the material in a one-dimensional stress state. Compared with a Hopkinson pressure bar and a pull bar, the Hopkinson torsion bar is particularly suitable for researching the mechanical properties of materials in a dynamic shearing state and a pure shearing state, and the radial inertia effect does not exist in the bar. The dynamic torsion test of the Hopkinson torsion bar is closest to the assumption of one-dimensional stress waves, and moreover, the torsion waves in the elastic bar are not dispersed. In the 70 s T.N i cho as et al, a pre-stored energy split hopkinson torsion bar was invented. The pre-stored energy type split Hopkinson torsion bar divides the torsion incident bar into two parts. One end of the rod is provided with a rotating head which is convenient for adding external moment (load), and the other end is connected with the test piece (the section is called a pre-twisting section). A holding clamp (wherein the main component is a bolt with a ring-shaped V-shaped groove in the middle) is used for clamping the rod at the boundary of the two sections to prevent the rod from rotating. The rotating head is rotated by a jack or other means to torsionally load the pre-twisted section, where the torsional deformation energy is pre-stored. When the pre-stored energy value reaches the experimenter's expected value, the experimenter releases the clamping mechanism quickly, and the energy (stress, strain) of the pre-loading section is transmitted to the unloaded section of the incident rod in the form of wave to form a torsional loading wave. The main disadvantages of this approach are:
1. the clamping mechanism is difficult to clamp the rod completely without rotation and tends to tighten the clamping force (further tightening the bolt) continuously during loading to prevent rotational slippage. During this process, sudden bolt breakage often occurs, which results in failure of the experiment.
2. During the experiment, the energy-storing torsion bar releases the clamp by twisting off the bolt with the annular V-shaped groove in the middle, and the process of twisting off the bolt has great randomness, thus seriously influencing the repeatability of the experimental conditions of the waveform.
In 1971, Duffy et al proposed a novel explosive loading method. Two rotating blades are symmetrically and fixedly connected to two sides (on the same diameter) of the loading end of the incident rod, and the two groups of explosive bags are symmetrically arranged on the same side of the two rotating blades respectively. During loading, two explosive bags are simultaneously ignited through parallel connection of the blasting fuse, the impact force generated by explosion is equivalent to applying a pair of force couples to the loading rod to form torsional waves, and instantaneous loading of dynamic torsional loads is completed. Explosion impact loading compares with advance torsion loading mode, can avoid the difficult problem of control of anchor clamps pressure, the experiment is failed easily to explosion loading also has transient characteristics, and when can greatly reduced stress wave front rise, nevertheless there is obvious short slab yet: (1) the loading torque cannot be accurately controlled due to the influence of unpredictable factors such as difficulty in accurately controlling the explosive components and the number and the explosive being affected by moisture, and the experimental repeatability is poor; (2) in the explosive loading process, the test piece is actually subjected to the effect of the loading at the strain rate, namely the loading at the strain rate is difficult to ensure by the common explosive loading mode. Therefore, this method has not been widely used either.
The invention relates to a T-shaped separated Hopkinson torsion bar in 2013, and the like, and the invention almost overcomes all the defects of a pre-stored energy type torsion bar. However, for structural reasons, complex bending waves are inevitably generated in the converter, which are difficult to eliminate and are transmitted into the twisted incident rod. In addition, for a torsion bar with a large diameter (such as 1000mm), a long time is needed for the wave to propagate on the cross section of the bar, and meanwhile, the wave is already propagated along the axial direction, so that the rising edge of the torsional incident wave cannot be steep, and the improvement of the experimental strain rate is influenced.
In 2015, Qin and the like invented flywheel type Hopkinson torsion bars, and the problems that a T-shaped separated Hopkinson torsion bar is asymmetrically loaded to cause bending waves and the rising edge of torsional incident waves cannot be steep due to the fact that the cross section of the bar (tube) is too large are solved. However, because the flywheel is in contact with the end face of the incident rod in an axial movement mode, torque transmission needs to be completed by friction force between the surfaces, and because a certain time is needed from the beginning of contact to the complete contact (no relative motion between the surfaces), the rising edge of the torsion pulse generated in the mode is too long, and the requirement of a conventional Hopkinson torsion bar cannot be met.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an electromechanical combined loading type Hopkinson torsion bar.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an electromechanical combination loaded hopkinson torsion bar comprising: the support part comprises a base support, and a sleeper is arranged on the base support;
the guide rail is erected on the sleeper and is provided with a central support;
twisting the incident rod;
a torsional transmission rod;
the torsion incident rod and the torsion transmission rod are fixed on the guide rail through a central support arranged on the guide rail, and a test piece assembly is arranged between the torsion incident rod and the torsion transmission rod;
one end of the guide rail close to the torsion incident rod is provided with a power system, which specifically comprises: the energy accumulator, the axial powerful butt joint system, the rotary power loading and control system, the rotary energy storage and release system, the circumferential rapid loading system and the torsion pulse shaper are sequentially connected together, and the torsion pulse shaper is connected with the torsion incident rod.
Preferably, the axial powerful docking system, the rotary power loading and control system and the rotary energy storage and release system are rigidly connected together.
Preferably, an adjusting ground pin is arranged below the base support.
Preferably, the bottom of the axial powerful butt joint system, the rotary power loading and control system, the rotary energy storage and release system and the circumferential rapid loading system is provided with an adjustable base, and the adjustable base is arranged on the guide rail.
Preferably, the circumferential rapid loading system comprises a torsion pulse output shaft and a shaftless inner disc,
the shaftless inner collision disc is an inwards concave disc;
one end of the torsion pulse output shaft is provided with an outward protruding shifting fork, the shaftless inward collision disc is supported on the periphery of the torsion pulse output shaft in a suspension mode, the shaftless inward collision disc rotates to circumferentially collide with the outward protruding shifting fork of the torsion pulse output shaft, and dynamic torsion pulses are formed in the torsion pulse output shaft.
Preferably, the circumferential rapid loading system further comprises a rotational residual kinetic energy absorbing system.
Preferably, the torsion pulse shaper is a thin-walled cylinder structure with flanges at two ends, and is used for shaping the torsion pulse in the torsion pulse output shaft into the torsion pulse required by the test.
Compared with the prior art, the invention has the following technical effects:
in the invention, the no-shaft inner collision disc rotates to impact the torsion pulse output shaft, a transient torsion (shearing stress) pulse is generated in the torsion pulse output shaft, and a required pulse torque is directly applied to the end of the incident rod through the pulse shaper, so that the defects of the existing pre-stored energy separated Hopkinson torsion bar, an explosive-driven Hopkinson torsion bar device, a T-shaped Hopkinson torsion bar device and a flywheel type Hopkinson torsion bar device are overcome, the experiment difficulty is greatly reduced, and the experiment efficiency is greatly improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
fig. 1 is a front view of an electromechanical combination loading type hopkinson torsion bar provided by the invention, and fig. 2 is a sectional view of a section C-C in fig. 1;
the reference numbers in the figures illustrate: 1. the energy storage device comprises an energy storage device, 2 an axial powerful butt joint system, 3 a rotary power loading and control system, 4 a rotary energy storage and release system, 5 a circumferential rapid loading system, 5-1 a rotary residual kinetic energy absorption system, 5-2 a torsional pulse output shaft, 5-3 a shaftless inner collision disc, 6 a torsional pulse shaper, 7 a torsional incident rod, 8 a central support, 9 a test piece assembly, 10 a torsional transmission rod, 11 a guide rail, 12 a sleeper, 13 a base support, 14 an adjusting ground foot, 15 an adjustable base 1, 16 an adjustable base 2, 17 and the adjustable base 3.
The specific implementation structure is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, an electromechanical combined loading type hopkinson torsion bar comprises an energy accumulator 1, an axial strong butt joint system 2, a rotary power loading and control system 3, a rotary energy storage and release system 4, a circumferential rapid loading system 5, a torsional pulse shaper 6, a torsional incident rod 7, a central support 8, a test piece assembly 9, a torsional transmission rod 10, a guide rail 11, a rail sleeper 12, a foundation support 13, an adjusting foot 14, an adjustable base 1, an adjustable base 16, an adjustable base 2, an adjustable base 17 and an adjustable base 3.
The circumferential rapid loading system comprises a 5-1 rotation residual kinetic energy absorption system, a 5-2 torsion pulse output shaft and a 5-3 shaftless inner collision disc;
the shaftless inner collision disc is an inwards concave disc;
one end of the torsion pulse output shaft is provided with an outward protruding shifting fork, the shaftless inward collision disc is supported on the periphery of the torsion pulse output shaft in a suspension mode, the shaftless inward collision disc rotates to circumferentially collide with the outward protruding shifting fork of the torsion pulse output shaft, and dynamic torsion pulses are formed in the torsion pulse output shaft.
The torsion pulse shaper is of a thin-wall cylinder structure with flanges at two ends, and is used for shaping the torsion pulse in the torsion pulse output shaft into the torsion pulse required by the test.
The accumulator is first charged with a high pressure gas at a pressure ready to be released to propel the 2, 3, 4 assembly. The electric power starts the rotary power loading and controlling system 3 and drives the rotary energy storage and releasing system 4 to rotate at a high speed to store a certain amount of rotary kinetic energy. Then high-pressure gas in the energy accumulator 1 is released, the 2, 3 and 4 component assembly is pushed to rapidly move axially, the non-shaft inner collision disk 5-3 is collided and hung, and the non-shaft inner collision disk and the rotary energy storage and release system 4 are driven to rotate at the same speed. The non-shaft inner collision disk 5-3 rotates a certain angle and then collides with the torsion pulse output shaft 5-2, and dynamic torsion pulses are generated in the latter. The torsional pulse is shaped by a torsional pulse shaper 6 and enters a torsional incident rod 7. The shaped pulse propagates in the incident rod towards the end of the specimen where it is reflected and transmitted. The reflected signal forms a reflected pulse in the incident rod and is transmitted to the loading end of the incident rod; the transmission signal forms a transmission pulse that propagates towards the free end of the transmission rod. And recording the incident pulse, the reflected pulse and the transmitted pulse, and processing the recorded pulses according to a one-dimensional stress wave theory to obtain the dynamic shear stress, the dynamic shear strain and the strain rate of the test piece 5 so as to obtain a shear stress-strain curve of the test piece material under a certain strain rate.
The torsional pulse output shaft 5-2 is blocked to stop rotating after rotating for a certain angle, at the moment, the rotary energy storage and release system 4 is separated from the rotary power loading and control system 3, and the rotary energy storage and release system 4 is in a forced braking state; the rotating parts in the rotary power loading and control system 3 enter a free rotation state, and finally slowly stop rotating under the action of friction torque.
The invention makes up for the defects of the prior pre-stored energy type separated Hopkinson torsion bar, the explosive driven Hopkinson torsion bar device, the T-shaped Hopkinson torsion bar device and the flywheel type Hopkinson torsion bar device, greatly reduces the experimental difficulty and greatly improves the experimental efficiency.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an electromechanical combination loading type hopkinson torsion bar which characterized in that: the support comprises a support part, wherein the support part comprises a basic support, and a sleeper is arranged on the basic support;
the guide rail is erected on the sleeper and is provided with a central support;
twisting the incident rod;
a torsional transmission rod;
the torsion incident rod and the torsion transmission rod are fixed on the guide rail through a central support arranged on the guide rail, and a test piece assembly is arranged between the torsion incident rod and the torsion transmission rod;
one end of the guide rail close to the torsion incident rod is provided with a power system, which specifically comprises: the energy accumulator, the axial powerful butt joint system, the rotary power loading and control system, the rotary energy storage and release system, the circumferential rapid loading system and the torsional pulse shaper are sequentially arranged along the axis, and the torsional pulse shaper is connected with the torsional incident rod.
2. An electromechanical combination loaded hopkinson torsion bar as claimed in claim 1, wherein: the axial powerful butt joint system, the rotary power loading and controlling system and the rotary energy storage and releasing system are rigidly connected together along the axis.
3. An electromechanical combination loaded hopkinson torsion bar as claimed in claim 1, wherein: and an adjusting ground foot is arranged below the basic support.
4. An electromechanical combination loaded hopkinson torsion bar as claimed in claim 1, wherein: the bottom parts of the axial powerful butt joint system, the rotary power loading and control system, the rotary energy storage and release system and the circumferential rapid loading system are provided with adjustable bases, and the adjustable bases are arranged on the guide rail.
5. An electromechanical combination loaded hopkinson torsion bar as claimed in claim 1, wherein: the circumferential rapid loading system comprises a torsional pulse output shaft and a shaftless inner collision disc;
the shaftless inner collision disc is an inwards concave disc;
one end of the torsion pulse output shaft is provided with an outward protruding shifting fork, the shaftless inward collision disc is supported on the periphery of the torsion pulse output shaft in a suspension mode, the shaftless inward collision disc rotates to circumferentially collide with the outward protruding shifting fork of the torsion pulse output shaft, and dynamic torsion pulses are formed in the torsion pulse output shaft.
6. An electromechanical combination loaded hopkinson torsion bar as claimed in claim 1, wherein: the torsion pulse shaper is of a thin-wall cylinder structure with flanges at two ends, and is used for shaping the torsion pulse in the torsion pulse output shaft into the torsion pulse required by the test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311668.3A CN111413216A (en) | 2020-04-20 | 2020-04-20 | Electromechanical combined loading type Hopkinson torsion bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311668.3A CN111413216A (en) | 2020-04-20 | 2020-04-20 | Electromechanical combined loading type Hopkinson torsion bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111413216A true CN111413216A (en) | 2020-07-14 |
Family
ID=71492362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010311668.3A Pending CN111413216A (en) | 2020-04-20 | 2020-04-20 | Electromechanical combined loading type Hopkinson torsion bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111413216A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945726A (en) * | 2021-01-29 | 2021-06-11 | 太原理工大学 | Split Hopkinson bar pulling/pressing-twisting dynamic composite loading device and operation method |
| CN114878355A (en) * | 2022-05-07 | 2022-08-09 | 天津大学 | Friction test device based on Hopkinson torsion bar |
| CN115452551A (en) * | 2022-08-23 | 2022-12-09 | 中国人民解放军空军工程大学 | Pneumatic Hopkinson torsion bar device and operation method |
| CN116625848A (en) * | 2023-05-18 | 2023-08-22 | 天津大学 | Composite loading device |
| CN117804934A (en) * | 2023-11-28 | 2024-04-02 | 暨南大学 | Dynamic impact torsion bar experiment system with filtering equipment |
-
2020
- 2020-04-20 CN CN202010311668.3A patent/CN111413216A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945726A (en) * | 2021-01-29 | 2021-06-11 | 太原理工大学 | Split Hopkinson bar pulling/pressing-twisting dynamic composite loading device and operation method |
| CN112945726B (en) * | 2021-01-29 | 2022-06-07 | 太原理工大学 | Split Hopkinson bar pulling/pressing-twisting dynamic composite loading device and operation method |
| CN114878355A (en) * | 2022-05-07 | 2022-08-09 | 天津大学 | Friction test device based on Hopkinson torsion bar |
| CN115452551A (en) * | 2022-08-23 | 2022-12-09 | 中国人民解放军空军工程大学 | Pneumatic Hopkinson torsion bar device and operation method |
| CN116625848A (en) * | 2023-05-18 | 2023-08-22 | 天津大学 | Composite loading device |
| CN116625848B (en) * | 2023-05-18 | 2024-01-09 | 天津大学 | Composite loading device |
| CN117804934A (en) * | 2023-11-28 | 2024-04-02 | 暨南大学 | Dynamic impact torsion bar experiment system with filtering equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111413216A (en) | Electromechanical combined loading type Hopkinson torsion bar | |
| CN212134379U (en) | Electromechanical combined loading type Hopkinson torsion bar | |
| CN104729918B (en) | Dynamic pull/pressing and torsion synchronous combined loading experiment device | |
| CN111044353B (en) | Split Hopkinson bar tension-torsion load composite loading device and using method thereof | |
| CN103076223A (en) | Launcher based on Hopkinson pull rod test equipment | |
| CN111238970A (en) | Drop hammer type steel wire rope impact failure test device and method | |
| CN114878355B (en) | Friction test device based on Hopkinson torsion bar | |
| US4469756A (en) | Method of and apparatus for forming an outwardly projecting bulge in a steel wire strand for forming an anchor in concrete | |
| CN109026103A (en) | A kind of expanding extrusion friction anchor shaft anchor cable structure | |
| CN201387410Y (en) | Tensile impact experimental device based on Hopkinson pressure bar technique | |
| CN111207174A (en) | Displacement amplification type self-resetting damper based on shape memory alloy | |
| CN115824843A (en) | Magnetic suspension type single-pulse impact torsion testing equipment | |
| CN111366486A (en) | Torsion locking and releasing device | |
| US5351553A (en) | High rate flywheel tensile testing apparatus for viscoelastic materials | |
| CN111044352B (en) | Separated Hopkinson bar pressure and torsion load composite loading device and use method thereof | |
| CN109187231A (en) | A kind of electromagnetism pressure-rotary split-Hopkinson torsional bar | |
| CN210090214U (en) | Electromagnetic type magnetic resistance type Hopkinson torsion bar | |
| CN210893926U (en) | Tensile loading device for testing compression strength of composite laminated plate after impact | |
| CN220690704U (en) | Electromagnetic driving gear type Hopkinson torsion bar | |
| CN117804934B (en) | Dynamic impact torsion bar experiment system with filtering equipment | |
| CN211955048U (en) | Disconnect-type hopkinson torsion bar | |
| CN216891991U (en) | Novel conical rigging for anchor rope | |
| CN112213391A (en) | Nondestructive excitation inspection device for anchor rod | |
| CN211145158U (en) | Tyre type coupling | |
| CN221377519U (en) | Torque excitation device of Hopkinson torsion bar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |