CN112539992A - Hopkinson pressure bar experiment multistage pulse loading device and experiment method thereof - Google Patents
Hopkinson pressure bar experiment multistage pulse loading device and experiment method thereof Download PDFInfo
- Publication number
- CN112539992A CN112539992A CN202011385660.8A CN202011385660A CN112539992A CN 112539992 A CN112539992 A CN 112539992A CN 202011385660 A CN202011385660 A CN 202011385660A CN 112539992 A CN112539992 A CN 112539992A
- Authority
- CN
- China
- Prior art keywords
- bullet
- connecting rod
- pressure bar
- loading device
- speed
- 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.)
- Granted
Links
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
-
- 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
- G01N2203/0266—Cylindrical specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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 relates to a multi-stage pulse loading device for a Hopkinson pressure bar experiment and an experiment method thereof, belonging to the field of mechanical property test.
Description
Technical Field
The invention relates to a Hopkinson pressure bar experiment multistage pulse loading device and an experiment method thereof, and belongs to the technical field of dynamic mechanical property tests of brittle materials by adopting an SHPB experiment system.
Background
With the continuous expansion and development of the engineering construction field, many structures often experience multiple dynamic load impacts in the engineering rather than single dynamic load impacts, for example, a coal mine supporting structure bears multiple dynamic load impacts, a coastal port component bears multiple wave impact actions, and multiple longitudinal wave impact actions during an earthquake, so that the research on the mechanical properties of materials under multiple continuous dynamic load impacts is of practical significance. The traditional separated Hopkinson pressure bar is used for researching high strain rate (10) of brittle materials such as coal rock mass and the like2～104) The most common experimental device during dynamic load impact can realize single pulse loading, and a high-speed dynamic signal acquisition instrument is used for acquiring strain signals of strain gauges attached to an incident rod and a transmission rod and calculating the dynamic performance of the rock brittle experimental material. However, the conventional loading mode taking compressed air as power has difficulty in realizing multi-pulse loading due to structural limitation. And because the position of the bullet is difficult to be constantly determined and the air pressure of the compressed air is unstable, the bullet is difficult to apply dynamic load at a constant speed, and the difficulty is increased for setting the comparison experiment conditions.
The invention patent No. CN109323938 discloses a multi-stage bullet automatic loading generating device applying a Hopkinson pressure bar. The device utilizes electromagnetic device thrustor to load the first bullet into the launching pipeline, then, when the first bullet is launched under the high-pressure thrust generated by the launching device, a part of high-pressure airflow enters the backflow pipeline and drives the thrustor to push the second bullet into the launching pipeline, and the reciprocating circulation is carried out in this way, so that the automatic loading of the multi-stage bullets is realized. The method can realize multi-pulse loading of a test piece, but a bullet of the device has to pass through the cartridge singly, the time interval between pulses cannot be reduced when the device is used for multi-pulse loading test, and the bullet cannot be loaded at the same speed due to the fact that the power source of the device is compressed air and is not affected by constant pressure.
Disclosure of Invention
Aiming at the limitations that the traditional split Hopkinson pressure bar test system adopting compressed air as power can only carry out single pulse loading and the invention provides a Hopkinson pressure bar test multistage pulse loading device adopting an adjustable-speed motor as power and an experiment method thereof, and the pulse quantity and pulse interval required by the experiment can be obtained by changing the quantity of sub bullets and the distance between the sub bullets.
The technical scheme of the invention is as follows:
multistage pulse loading device of hopkinson depression bar experiment, including the truss, truss one side is equipped with the incident pole, is equipped with buncher on the truss, is equipped with the connecting rod on the buncher output shaft, and the connecting rod end is equipped with the bullet combination, and the bullet combination includes two at least bullets, and directional mutual movement between the bullet, bullet combination are used for providing many pulse loading.
The speed-adjustable motor is a variable-frequency speed-adjustable motor using an alternating current-direct current-alternating current frequency converter, and the mode changes the speed-adjusting method of synchronous rotating speed of the motor by changing the frequency of a stator power supply of the motor. The method has high efficiency in speed regulation, and no additional loss is generated in the speed regulation process; large speed regulation range, hard characteristics and high precision.
The connecting rod is used for connecting the motor rotating shaft and the bullet, obtaining the kinetic energy of the motor and transmitting the obtained kinetic energy to the bullet end.
Preferably, the bullet combination includes outside guide rail, and outside guide rail is the framework, and the bullet includes the body, and the bullet includes fixed bullet and activity bullet, fixed bullet and outside guide rail fixed connection, activity bullet and outside guide rail swing joint. The movable bullet can move along the external guide rail and is impacted with the bullet fixedly connected with the front part to form multi-stage pulse.
Preferably, the projectile comprises a cylindrical or spindle type. The bullets with different materials, shapes and sizes can be replaced according to experimental requirements so as to obtain various impact strengths and loading waveforms.
It is further preferred that when the projectile body is cylindrical, the end of the incident rod contacting the bullet combination is provided with a wave shaper, which is a thin cylinder with a diameter smaller than that of the incident rod, for achieving a constant strain rate loading of the loaded wave, and the material is brass H62.
Preferably, the outer guide rail is provided with slide rails on both sides, and the movable bullet is provided with side wings on both sides, wherein the side wings are located in the slide rails.
Further preferably, a steel ball is arranged in the slide rail and used for reducing the friction force between the side wing and the slide rail.
Further preferably, a bolt is arranged in the slide rail and is in threaded connection with the slide rail. The position of the bolt is used for limiting the sliding space of the side wing in the sliding rail.
The bullet combination appearance of the bullet combination is similar to a fishbone shape, the bullet combination is integrally a special-shaped bullet, the number of the bullets and the interval between the bullets can be actively adjusted according to the pulse number and the pulse time interval required by the experiment, and therefore the loading waveform required by the experiment can be obtained. The bullet comprises two bullets, the first bullet is a bullet which impacts the incident rod and is fixedly connected with the external guide rail, the second bullet comprises a cylindrical bullet body and side wings, the side wings are distributed on two sides of the bullet body, the side wings are slightly smaller than the sliding rail, and the bullet can move back and forth in the sliding rail or stop moving back and forth due to the fact that bolts arranged on the sliding rail block or impact the front bullet. The bullet is made of 48CrMoA, and the reason that 48CrMoA is selected as the bullet material is that 48CrMoA is high in density and corrosion-resistant, and can adapt to different experimental conditions.
Preferably, the output shaft is provided with a rotating speed monitor for monitoring and feeding back the rotating speed of the output shaft. The rotating speed monitor adopts a Hall switch detection method, and comprises three magnets distributed on a motor rotor, and a Hall switch arranged on the outer edge of the circumference of the movement track of the magnets, wherein the Hall switch periodically induces magnetic lines of force when the motor rotates to generate pulse voltage, and the time interval between pulses is monitored in real time, so that the rotating speed of the motor can be converted.
Preferably, the trusses on both sides of the connecting rod are provided with laser switches, including a laser emitting element and a laser receiving element, for positioning the horizontal position of the connecting rod. The exact location of the bullet rotation can be determined by whether the laser receiving element is interrupted and a signal can be sent once.
Preferably, the output shaft is sleeved with a pushing member, the pushing member is a telescopic disc, bearings are arranged between two ends of the pushing member and the output shaft, one end of the pushing member is fixedly connected with the connecting rod, the telescopic disc rotates around the output shaft when the output shaft drives the connecting rod to rotate, a pushing spring is arranged in the pushing member and connected to an electromagnetic valve at one end of the pushing member, the pushing spring is in a compressed state initially and can be popped out after receiving a laser switch signal, and the connecting rod is pushed to the vertical plane where the incident rod is located from an initial position.
Further preferably, the tail end of the output shaft is connected with the truss through a bearing support, and a spring is arranged between the bearing support and the connecting rod. The spring is used for keeping the connecting rod in a vertical plane far away from the incident rod when the initial pushing component is not acted and the bullet is not contacted with the incident rod.
Preferably, the speed regulating motor is fixedly connected with the truss through a motor bracket. The truss and the incident rod are arranged on the SHPB experimental device base.
Preferably, one end of the connecting rod is provided with a square connecting hole, and the connecting rod is sleeved on the output shaft through the square connecting hole. The connecting rod is a slender rod with different length specifications, one end of the connecting rod connected with the motor is provided with a square connecting hole which is slightly larger than the electronic rotating shaft and is vertical to the axis of the rod on the axis of the slender rod, and the connecting rod can be sleeved on the rotating shaft of the motor. The material of connecting rod is high strength stainless steel, chooses for use high strength stainless steel purpose for reducing the deformation of the connecting rod body of rod as far as possible when taking the bullet rotation to accurate with the rotational energy transmission bullet of motor.
The experimental method of the multi-stage pulse loading device for the Hopkinson pressure bar experiment adopts the device, and comprises the following steps:
designing an experimental scheme, determining the rotating speed of a motor according to the experimental scheme, and selecting proper bullet quantity and proper distances among bullets;
secondly, pasting the strain gauge at a proper position of the incident rod and the transmission rod, processing a to-be-tested sample into a cylinder meeting the requirements of a Hopkinson pressure bar experiment, and then placing and fixing the sample between the incident rod and the transmission rod;
thirdly, mounting and adjusting the positions of the speed regulating motor and the motor bracket, and turning on a high-speed dynamic signal acquisition instrument, wherein the high-speed dynamic signal acquisition instrument is used for acquiring voltage information of a strain gauge and turning on the speed regulating motor;
fourthly, the rotating speed monitor receives a rotating speed signal of the output shaft, the motor rotates at a constant speed when the rotating speed signal reaches a set rotating speed value, the laser switch obtains a determined position of the connecting rod and then enables the pushing component to work, the connecting rod and the bullet move to the plane where the end of the incident rod is located, the bullet collides with the shaper at the moment when moving to the horizontal state, meanwhile, the laser switch obtains a second signal, and the power supply of the speed regulating motor is turned off;
fifthly, storing the voltage information of the strain gauge acquired by the high-speed dynamic signal acquisition instrument by a computer to form a stress wave curve loaded by multiple pulses;
sixthly, closing the electromagnetic valve, returning the bullet and the connecting rod to the initial position, taking out the test piece, and cleaning the test bed;
and seventhly, processing the stress wave data stored by the computer, and obtaining the stress, strain rate and energy information of the test piece through integration.
The device adopts a speed-adjustable motor as power, the rotating speed of the motor is transmitted to a bullet through a connecting rod, the connecting rod and the bullet are controlled by a light spring to rotate along with a rotating shaft of the motor at an initial state, a rotating speed monitor and a laser switch synchronously receive signals, the rotating speed of the motor is kept unchanged along with the increase of the rotating speed of the motor until the rotating speed is set by a test, a pushing component works after the laser switch catches the position of the connecting rod, the connecting rod and the bullet are pushed to the vertical surface of an incident rod, the bullet is contacted with the incident rod at the moment of moving to the horizontal, and dynamic pressure waves are transmitted to the incident rod through a shaper. The device can ensure that the bullet impacts the incident rod at a determined linear speed by fixing the rotating speed of the motor and the length of the connecting rod.
Preferably, in the first step, the number of bullets is consistent with the set pulse level, the impact speed is V, and the interval time of the multi-level pulses is T，T＝T1,T2,., the length of the connecting rod is L, the rotating speed of the motor is W-V/L, the distance between bullets is L, and L-T × V.
Supposing that the pulse frequency required in a multi-stage pulse experiment of a Hopkinson pressure bar experiment is three times, the required impact speed is V, and the interval time between the second pulse and the first pulse is T1The time interval between the third pulse and the second pulse is T2. The length of connecting rod is L. The required motor speed can be determined as follows:
W＝V/L
the distance L between the warhead of the second bullet and the tail end of the warhead of the first bullet1Comprises the following steps:
L1＝T1×V
the distance L between the warhead of the third bullet and the tail of the second bullet2Comprises the following steps:
L2＝T2×V
the invention has the beneficial effects that:
due to the design of the first bullet body guide rail and the bullet, the device and the method can obtain the pulse quantity and the pulse interval required by the experiment by changing the quantity of the bullet bodies and the distance between the bullet bodies; meanwhile, various impact strengths and loading waveforms can be obtained by adjusting the material and shape of the bullet.
The conventional split hopkinson pressure bar powered by compressed air has difficulty in determining a constant impact velocity due to unstable air pressure and difficulty in determining a constant bullet position. The technology using the rotation of the motor as the power can more easily obtain the determined linear velocity to impact the incident rod due to the controllable rotating speed of the motor.
The multi-pulse loading device is a power part of the split Hopkinson pressure bar experiment system, can be upgraded and modified in the existing split Hopkinson pressure bar experiment system by taking compressed air as power, and is wide in adaptability.
Drawings
FIG. 1 is a schematic view of the entire apparatus of the present invention
FIG. 2 is an assembly view of the motor bracket of the device of the present invention
FIG. 3 is a schematic view of a fishbone-type bullet of the present invention
FIG. 4 is a schematic diagram of the multi-pulse loading of the apparatus of the present invention
In the figure: 1-truss, 2-rotating speed monitor, 3-laser emitting element, 4-laser receiving element, 5-pushing member, 6-spring, 7-speed regulating motor, 8-connecting rod, 9-square connecting hole, 10-fixed bullet, 11-fixed bullet body, 12-external guide rail, 13-sliding rail, 14-steel ball, 15-bolt, 16-movable bullet, 17-movable bullet body, 18-side wing, 19-shaper, 20-SHPB test system base, 21-bullet combination, 22-incident rod and 23-output shaft.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
multistage pulse loading device of hopkinson depression bar experiment, including truss 1, as shown in fig. 1, 2, the truss cross-section is "concave" font, and truss one side is equipped with incident pole 22, is equipped with buncher 7 on the truss, is equipped with connecting rod 8 on the buncher output shaft 23, and the connecting rod end is equipped with bullet combination 21, and the bullet combination includes two at least bullets, and directional mutual motion between the bullet, bullet combination are used for providing many pulse loading.
The speed-adjustable motor is a variable-frequency speed-adjustable motor using an alternating current-direct current-alternating current frequency converter, and the mode changes the speed-adjusting method of synchronous rotating speed of the motor by changing the frequency of a stator power supply of the motor. The method has high efficiency in speed regulation, and no additional loss is generated in the speed regulation process; large speed regulation range, hard characteristics and high precision.
The connecting rod is used for connecting the motor rotating shaft and the bullet, obtaining the kinetic energy of the motor and transmitting the obtained kinetic energy to the bullet end.
The bullet combination comprises an outer guide rail 12, as shown in fig. 3, the outer guide rail is a frame body, the bullets comprise bullets, the bullets comprise fixed bullets 10 and movable bullets 16, the fixed bullets are fixedly connected with the outer guide rail, and the movable bullets are movably connected with the outer guide rail. The movable bullet can move along the external guide rail and is impacted with the bullet fixedly connected with the front part to form multi-stage pulse. The two sides of the external guide rail are provided with slide rails 13, the two sides of the bullet body of the movable bullet are provided with side wings 18, and the side wings are positioned in the slide rails. The slide rail is internally provided with a steel ball 14 for reducing the friction between the side wing and the slide rail. A bolt 15 is arranged in the slide rail and is in threaded connection with the slide rail. The position of the bolt is used for limiting the sliding space of the side wing in the sliding rail.
The bullet combination appearance of the bullet combination is similar to a fishbone shape, the bullet combination is integrally a special-shaped bullet, the number of the bullets and the interval between the bullets can be actively adjusted according to the pulse number and the pulse time interval required by the experiment, and therefore the loading waveform required by the experiment can be obtained. The bullet comprises two bullets, the first bullet is a bullet which impacts the incident rod and is fixedly connected with the external guide rail, the second bullet comprises a cylindrical bullet body and side wings, the side wings are distributed on two sides of the bullet body, the side wings are slightly smaller than the sliding rail, and the bullet can move back and forth in the sliding rail or stop moving back and forth due to the fact that bolts arranged on the sliding rail block or impact the front bullet. The bullet is made of 48CrMoA, and the reason that 48CrMoA is selected as the bullet material is that 48CrMoA is high in density and corrosion-resistant, and can adapt to different experimental conditions.
And a rotating speed monitor 2 is arranged on the output shaft and used for monitoring and feeding back the rotating speed of the output shaft. The rotating speed monitor adopts a Hall switch detection method, and comprises three magnets distributed on a motor rotor, and a Hall switch arranged on the outer edge of the circumference of the movement track of the magnets, wherein the Hall switch periodically induces magnetic lines of force when the motor rotates to generate pulse voltage, and the time interval between pulses is monitored in real time, so that the rotating speed of the motor can be converted.
The trusses on the two sides of the connecting rod are provided with laser switches which comprise laser emitting elements 3 and laser receiving elements 4 and are used for positioning the horizontal position of the connecting rod. The exact location of the bullet rotation can be determined by whether the laser receiving element is interrupted and a signal can be sent once.
The output shaft is sleeved with a pushing member 5 which is a telescopic disc, bearings are arranged between two ends of the pushing member and the output shaft, one end of the pushing member is fixedly connected with the connecting rod, the telescopic disc rotates around the output shaft when the output shaft drives the connecting rod to rotate, a pushing spring is arranged in the pushing member and connected to an electromagnetic valve at one end in the pushing member, the pushing spring is in a compressed state initially and can be popped out after receiving a laser switch signal, and the connecting rod is pushed to a vertical plane where the incident rod is located from an initial position.
Example 2:
the structure of the multi-stage pulse loading device for the hopkinson pressure bar experiment is as described in embodiment 1, except that the projectile body is spindle-shaped.
Example 3:
the structure of the multi-stage pulse loading device for the Hopkinson pressure bar experiment is as described in embodiment 1, except that the projectile body is cylindrical, one end of the incident rod, which is in contact with the bullet combination, is provided with a waveform shaper 19, the waveform shaper is a thin cylinder with the diameter smaller than that of the incident rod and is used for enabling a loading waveform to realize constant strain rate loading, and the material is brass H62.
Example 4:
the structure of the multi-stage pulse loading device for the Hopkinson pressure bar experiment is as described in embodiment 1, and the difference is that the tail end of an output shaft is connected with a truss through a bearing support, and a spring 6 is arranged between the bearing support and a connecting rod. The spring is used for keeping the connecting rod in a vertical plane far away from the incident rod when the initial pushing component is not acted and the bullet is not contacted with the incident rod.
Example 5:
the structure of the multi-stage pulse loading device for the Hopkinson pressure bar experiment is as described in embodiment 1, except that the speed regulating motor is fixedly connected with the truss through the motor support. The truss and the incident rod are arranged on the SHPB experimental device base 20. One end of the connecting rod is provided with a square connecting hole 9, and the connecting rod is sleeved on the output shaft through the square connecting hole. The connecting rod is a slender rod with different length specifications, one end of the connecting rod connected with the motor is provided with a square connecting hole which is slightly larger than the electronic rotating shaft and is vertical to the axis of the rod on the axis of the slender rod, and the connecting rod can be sleeved on the rotating shaft of the motor. The material of connecting rod is high strength stainless steel, chooses for use high strength stainless steel purpose for reducing the deformation of the connecting rod body of rod as far as possible when taking the bullet rotation to accurate with the rotational energy transmission bullet of motor.
Example 6:
the experimental method of the multi-stage pulse loading device for the Hopkinson pressure bar experiment adopts the device used in the embodiment 1, and comprises the following steps:
designing an experimental scheme, determining the rotating speed of a motor according to the experimental scheme, and selecting proper bullet quantity and proper distances among bullets; in the embodiment, the pulse times required in a multi-stage pulse experiment of a Hopkinson pressure bar experiment are three times, the required impact speed is V, and the interval time between the second pulse and the first pulse is T1The time interval between the third pulse and the second pulse is T2. The length of connecting rod is L. The required motor speed can be determined as follows:
W＝V/L
the distance L between the warhead of the second bullet and the tail end of the warhead of the first bullet1Comprises the following steps:
L1＝T1×V
the distance L between the warhead of the third bullet and the tail of the second bullet2Comprises the following steps:
L2＝T2×V
secondly, pasting the strain gauge at a proper position of the incident rod 22 and the transmission rod, processing a to-be-tested sample into a cylinder meeting the requirements of a Hopkinson pressure bar experiment, and then placing and fixing the sample between the incident rod and the transmission rod;
thirdly, installing and adjusting the position of the speed regulating motor, and turning on a high-speed dynamic signal acquisition instrument which is used for acquiring voltage information of a strain gauge and turning on the speed regulating motor;
fourthly, the rotating speed monitor receives a rotating speed signal of the output shaft, the motor rotates at a constant speed when the rotating speed signal reaches a set rotating speed value, the laser switch obtains a determined position of the connecting rod and then enables the pushing component to work, the connecting rod and the bullet move to the plane where the end of the incident rod is located, the bullet collides with the shaper at the moment when moving to the horizontal state, meanwhile, the laser switch obtains a second signal, and the power supply of the speed regulating motor is turned off;
fifthly, storing the voltage information of the strain gauge acquired by the high-speed dynamic signal acquisition instrument by a computer to form a stress wave curve loaded by multiple pulses;
sixthly, closing the electromagnetic valve, returning the bullet and the connecting rod to the initial position, taking out the test piece, and cleaning the test bed;
and seventhly, processing the stress wave data stored by the computer, and obtaining the stress, strain rate and energy information of the test piece through integration.
The device adopts a speed-adjustable motor as power, the rotating speed of the motor is transmitted to a bullet through a connecting rod, the connecting rod and the bullet are controlled by a light spring to rotate along with a rotating shaft of the motor at an initial state, a rotating speed monitor and a laser switch synchronously receive signals, the rotating speed of the motor is kept unchanged along with the increase of the rotating speed of the motor until the rotating speed is set by a test, a pushing component works after the laser switch catches the position of the connecting rod, the connecting rod and the bullet are pushed to the vertical surface of an incident rod, the bullet is contacted with the incident rod at the moment of moving to the horizontal, and dynamic pressure waves are transmitted to the incident rod through a shaper. The device can ensure that the bullet impacts the incident rod at a determined linear speed by fixing the rotating speed of the motor and the length of the connecting rod.
Claims (10)
1. Multistage pulse loading device of hopkinson depression bar experiment, including the truss, its characterized in that, truss one side is equipped with the incident pole, is equipped with buncher on the truss, is equipped with the connecting rod on the buncher output shaft, and the connecting rod end is equipped with the bullet combination, and the bullet combination includes two at least bullets, and directional mutual removal between the bullet, bullet combination are used for providing many pulse loading.
2. The hopkinson pressure bar experiment multistage pulse loading device of claim 1, wherein the bullet assembly comprises an external guide rail, the external guide rail is a frame, the bullet comprises a bullet body, the bullet comprises a fixed bullet and a movable bullet, the fixed bullet is fixedly connected with the external guide rail, and the movable bullet is movably connected with the external guide rail.
3. The hopkinson pressure bar experiment multistage pulse loading device of claim 1, wherein the projectile body shape comprises a cylindrical shape or a spindle shape;
preferably, when the bullet body is cylindrical, the end of the incident rod, which is in contact with the bullet combination, is provided with a waveform shaper, and the waveform shaper is a thin cylinder with a diameter smaller than that of the incident rod, so that the loaded waveform realizes constant strain rate loading.
4. The split Hopkinson pressure bar experiment multistage pulse loading device of claim 2, wherein slide rails are arranged on two sides of the external guide rail, and side wings are arranged on two sides of the bullet body of the movable bullet and are positioned in the slide rails;
preferably, steel balls are arranged in the slide rail;
further preferably, a bolt is arranged in the slide rail and is in threaded connection with the slide rail.
5. The split Hopkinson pressure bar experiment multistage pulse loading device according to claim 1, wherein a rotation speed monitor is arranged on the output shaft.
6. The Hopkinson pressure bar experiment multistage pulse loading device as recited in claim 5, wherein the trusses on both sides of the connecting bar are provided with laser switches, including a laser emitting element and a laser receiving element, for positioning the horizontal position of the connecting bar.
7. The multi-stage pulse loading device for the Hopkinson pressure bar experiment as recited in claim 6, wherein the output shaft is sleeved with a pushing member, the pushing member is a telescopic disc, bearings are arranged between two ends of the pushing member and the output shaft, one end of the pushing member is fixedly connected with the connecting rod, a pushing spring is arranged in the pushing member, the pushing spring is connected to the electromagnetic valve at one end in the pushing member, and the pushing spring is in a compressed state initially;
preferably, the tail end of the output shaft is connected with the truss through a bearing support, and a spring is arranged between the bearing support and the connecting rod.
8. The Hopkinson pressure bar experiment multistage pulse loading device according to claim 1, wherein the speed regulating motor is fixedly connected with the truss through a motor bracket; one end of the connecting rod is provided with a square connecting hole, and the connecting rod is sleeved on the output shaft through the square connecting hole.
9. An experimental method of the multi-stage pulse loading device for the Hopkinson pressure bar experiment adopts the device as claimed in claim 7, and comprises the following steps:
designing an experimental scheme, determining the rotating speed of a motor according to the experimental scheme, and selecting proper bullet quantity and proper distances among bullets;
secondly, pasting the strain gauge at a proper position of the incident rod and the transmission rod, processing a to-be-tested sample into a cylinder meeting the requirements of a Hopkinson pressure bar experiment, and then placing and fixing the sample between the incident rod and the transmission rod;
thirdly, installing and adjusting the position of the speed regulating motor, and turning on a high-speed dynamic signal acquisition instrument which is used for acquiring voltage information of a strain gauge and turning on the speed regulating motor;
fourthly, the rotating speed monitor receives a rotating speed signal of the output shaft, the motor rotates at a constant speed when the rotating speed signal reaches a set rotating speed value, the laser switch obtains a determined position of the connecting rod and then enables the pushing component to work, the connecting rod and the bullet move to the plane where the end of the incident rod is located, the bullet collides with the shaper at the moment when moving to the horizontal state, meanwhile, the laser switch obtains a second signal, and the power supply of the speed regulating motor is turned off;
fifthly, storing the voltage information of the strain gauge acquired by the high-speed dynamic signal acquisition instrument by a computer to form a stress wave curve loaded by multiple pulses;
sixthly, returning the bullet and the connecting rod to the initial position, taking out the test piece, and cleaning the test bed;
and seventhly, processing the stress wave data stored by the computer, and obtaining the stress, strain rate and energy information of the test piece through integration.
10. The experimental method of the hopkinson pressure bar experimental multistage pulse loading device of claim 9, wherein in the first step, the number of bullets is consistent with the set pulse stage number, the impact speed is V, the multistage pulse interval time is T, and T is T ═ T1,T2,., the length of the connecting rod is L, the rotating speed of the motor is W-V/L, the distance between bullets is L, and L-T × V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011385660.8A CN112539992B (en) | 2020-12-02 | 2020-12-02 | Hopkinson pressure bar experiment multistage pulse loading device and experiment method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011385660.8A CN112539992B (en) | 2020-12-02 | 2020-12-02 | Hopkinson pressure bar experiment multistage pulse loading device and experiment method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112539992A true CN112539992A (en) | 2021-03-23 |
| CN112539992B CN112539992B (en) | 2021-10-29 |
Family
ID=75016861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011385660.8A Active CN112539992B (en) | 2020-12-02 | 2020-12-02 | Hopkinson pressure bar experiment multistage pulse loading device and experiment method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112539992B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848132A (en) * | 2021-09-23 | 2021-12-28 | 中国工程物理研究院流体物理研究所 | Long pulse width multi-pulse loading test device based on gunpowder driving |
| CN118533670A (en) * | 2024-07-29 | 2024-08-23 | 中国矿业大学 | Anchor impact resistance testing equipment and method |
Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571464A (en) * | 2009-05-07 | 2009-11-04 | 上海聚德永升测控系统有限公司 | Pendulum hanging and swinging mechanism for oscillography impact testing machine |
| CN101988880A (en) * | 2010-08-26 | 2011-03-23 | 昆明理工大学 | Metal breaking tester |
| CN102301217A (en) * | 2009-10-06 | 2011-12-28 | 韩国生产技术研究院 | Simplified Bullet-proof Material Tester And Impactor |
| CN102466554A (en) * | 2010-11-17 | 2012-05-23 | 西北机器有限公司 | Shock response spectrum test machine |
| CN204330504U (en) * | 2015-01-04 | 2015-05-13 | 中国工程物理研究院总体工程研究所 | Falling weight impact test laser velocimeter and anti-secondary pulse integration test unit |
| CN205038111U (en) * | 2015-10-28 | 2016-02-17 | 内蒙古工业大学 | Concrete experimental apparatus that shocks resistance |
| CN105527176A (en) * | 2016-02-03 | 2016-04-27 | 中国矿业大学 | Test device for deep jointed rock mass fracturing mechanism under impact load |
| CN105823678A (en) * | 2016-06-08 | 2016-08-03 | 合肥工业大学 | Hopkinson pressure bar damper |
| CN106092626A (en) * | 2016-06-02 | 2016-11-09 | 中国矿业大学 | Water-filling pressure-bearing Blasting simulation device in a kind of coal petrography hole |
| CN106442111A (en) * | 2016-10-14 | 2017-02-22 | 安徽理工大学 | Multistage bullet firing device of Hopkinson pressure bar |
| CN106442110A (en) * | 2016-10-14 | 2017-02-22 | 安徽理工大学 | Secondary impact bullet for Hopkinson bar |
| CN206573298U (en) * | 2016-10-28 | 2017-10-20 | 广州汽车集团股份有限公司 | Automobile low speed collision combined test apparatus |
| CN107389476A (en) * | 2017-06-26 | 2017-11-24 | 宁波大学 | A kind of material large deformation Shock Compression Experiments method |
| CN107621418A (en) * | 2016-07-15 | 2018-01-23 | 波音公司 | For the device for the dynamic stress/strain-responsive for measuring ductile material |
| CN108072579A (en) * | 2017-11-23 | 2018-05-25 | 吉林大学 | The impact indentation test device and method of variable bit rate |
| CN108361023A (en) * | 2018-01-18 | 2018-08-03 | 西南石油大学 | The evaluation method for one, two cement plane breakdown strengths of cementing the well under dynamic load |
| CN109323938A (en) * | 2018-11-23 | 2019-02-12 | 浙江大学 | A kind of multistage bullet automatic Loading emitter applied to Hopkinson pressure bar |
| CN110470446A (en) * | 2019-08-21 | 2019-11-19 | 东北大学 | Shock and vibration, the lower material blade service reliability experimental provision again of high temperature excitation |
| CN110926936A (en) * | 2019-11-08 | 2020-03-27 | 山东科技大学 | Test piece dynamic lateral strain measuring device and method based on SHPB test system |
| CN110926937A (en) * | 2019-11-08 | 2020-03-27 | 山东科技大学 | Device and method for measuring dynamic lateral strain of test piece through liquid volume |
| CN111044373A (en) * | 2019-12-31 | 2020-04-21 | 浙江清华柔性电子技术研究院 | Dynamic mechanical test system |
| CN210638994U (en) * | 2019-04-26 | 2020-05-29 | 北京理工大学 | Protective device for axial strain of adjustable sample of Hopkinson pressure bar system |
| CN111323320A (en) * | 2020-04-22 | 2020-06-23 | 山东威雅苏扬防护科技有限公司 | Hopkinson bar-based continuous multiple equal pulse width collision impact test device and test method |
| CN111948074A (en) * | 2020-07-29 | 2020-11-17 | 山东威雅苏扬防护科技有限公司 | Hopkinson bar-based continuous multiple equal pulse width collision impact test device and test method |
-
2020
- 2020-12-02 CN CN202011385660.8A patent/CN112539992B/en active Active
Patent Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571464A (en) * | 2009-05-07 | 2009-11-04 | 上海聚德永升测控系统有限公司 | Pendulum hanging and swinging mechanism for oscillography impact testing machine |
| CN102301217A (en) * | 2009-10-06 | 2011-12-28 | 韩国生产技术研究院 | Simplified Bullet-proof Material Tester And Impactor |
| CN101988880A (en) * | 2010-08-26 | 2011-03-23 | 昆明理工大学 | Metal breaking tester |
| CN102466554A (en) * | 2010-11-17 | 2012-05-23 | 西北机器有限公司 | Shock response spectrum test machine |
| CN204330504U (en) * | 2015-01-04 | 2015-05-13 | 中国工程物理研究院总体工程研究所 | Falling weight impact test laser velocimeter and anti-secondary pulse integration test unit |
| CN205038111U (en) * | 2015-10-28 | 2016-02-17 | 内蒙古工业大学 | Concrete experimental apparatus that shocks resistance |
| CN105527176A (en) * | 2016-02-03 | 2016-04-27 | 中国矿业大学 | Test device for deep jointed rock mass fracturing mechanism under impact load |
| CN106092626A (en) * | 2016-06-02 | 2016-11-09 | 中国矿业大学 | Water-filling pressure-bearing Blasting simulation device in a kind of coal petrography hole |
| CN105823678A (en) * | 2016-06-08 | 2016-08-03 | 合肥工业大学 | Hopkinson pressure bar damper |
| CN107621418A (en) * | 2016-07-15 | 2018-01-23 | 波音公司 | For the device for the dynamic stress/strain-responsive for measuring ductile material |
| CN106442111A (en) * | 2016-10-14 | 2017-02-22 | 安徽理工大学 | Multistage bullet firing device of Hopkinson pressure bar |
| CN106442110A (en) * | 2016-10-14 | 2017-02-22 | 安徽理工大学 | Secondary impact bullet for Hopkinson bar |
| CN206573298U (en) * | 2016-10-28 | 2017-10-20 | 广州汽车集团股份有限公司 | Automobile low speed collision combined test apparatus |
| CN107389476A (en) * | 2017-06-26 | 2017-11-24 | 宁波大学 | A kind of material large deformation Shock Compression Experiments method |
| CN108072579A (en) * | 2017-11-23 | 2018-05-25 | 吉林大学 | The impact indentation test device and method of variable bit rate |
| CN108361023A (en) * | 2018-01-18 | 2018-08-03 | 西南石油大学 | The evaluation method for one, two cement plane breakdown strengths of cementing the well under dynamic load |
| CN109323938A (en) * | 2018-11-23 | 2019-02-12 | 浙江大学 | A kind of multistage bullet automatic Loading emitter applied to Hopkinson pressure bar |
| CN210638994U (en) * | 2019-04-26 | 2020-05-29 | 北京理工大学 | Protective device for axial strain of adjustable sample of Hopkinson pressure bar system |
| CN110470446A (en) * | 2019-08-21 | 2019-11-19 | 东北大学 | Shock and vibration, the lower material blade service reliability experimental provision again of high temperature excitation |
| CN110926936A (en) * | 2019-11-08 | 2020-03-27 | 山东科技大学 | Test piece dynamic lateral strain measuring device and method based on SHPB test system |
| CN110926937A (en) * | 2019-11-08 | 2020-03-27 | 山东科技大学 | Device and method for measuring dynamic lateral strain of test piece through liquid volume |
| CN111044373A (en) * | 2019-12-31 | 2020-04-21 | 浙江清华柔性电子技术研究院 | Dynamic mechanical test system |
| CN111323320A (en) * | 2020-04-22 | 2020-06-23 | 山东威雅苏扬防护科技有限公司 | Hopkinson bar-based continuous multiple equal pulse width collision impact test device and test method |
| CN111948074A (en) * | 2020-07-29 | 2020-11-17 | 山东威雅苏扬防护科技有限公司 | Hopkinson bar-based continuous multiple equal pulse width collision impact test device and test method |
Non-Patent Citations (5)
| Title |
|---|
| HUILAN REN 等: "Effect of temperature on the impact ignition behavior of the aluminum/polytetrafluoroethylene reactive material under multiple pulse loading", 《MATERIALS & DESIGN》 * |
| WENKAI HUANG 等: "A miniature multi-pulse series loading Hopkinson bar experimental device based on an electromagnetic launch", 《REVIEW OF SCIENTIFIC INSTRUMENTS》 * |
| 孙家骏: "《水射流切割技术》", 31 August 1992, 中国矿业大学出版社 * |
| 宁建国 等: "深部大断面硐室动静载作用下锚固承载结构稳定机理研究", 《采矿与安全工程学报》 * |
| 黄文恺: "冲击应力—应变仪关键技术研究", 《中国博士学位论文全文数据库工程科技Ⅱ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848132A (en) * | 2021-09-23 | 2021-12-28 | 中国工程物理研究院流体物理研究所 | Long pulse width multi-pulse loading test device based on gunpowder driving |
| CN113848132B (en) * | 2021-09-23 | 2023-07-04 | 中国工程物理研究院流体物理研究所 | Long pulse width multi-pulse loading test device based on gunpowder driving |
| CN118533670A (en) * | 2024-07-29 | 2024-08-23 | 中国矿业大学 | Anchor impact resistance testing equipment and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112539992B (en) | 2021-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112539992B (en) | Hopkinson pressure bar experiment multistage pulse loading device and experiment method thereof | |
| CN103389197B (en) | Horizontal impact testing stand driving means and bidirectional multifunctional horizontal impact testing stand | |
| CN203732234U (en) | Drop-hammer impact testing machine of coating sheet material | |
| US10571378B2 (en) | Mechanical rotary shock testing machines | |
| CN104515668A (en) | Ejection-type horizontal impact platform driven by air pressure | |
| CN206540719U (en) | A kind of micro- brill testing stand of ultrasonic wave for simulating moon probing | |
| CN104318828A (en) | Zero-gravity experiment system for spatial multi-dimensional unfolding mechanism | |
| CN106895991A (en) | A kind of micro- brill testing stand of ultrasonic wave for simulating moon probing | |
| CN107036921B (en) | Rolling fretting wear test device and method and wear depth modeling method | |
| CN115541418B (en) | Rock emission device for impact test and application method | |
| CN107607292A (en) | A kind of high speed joining WTO effect experimental rig | |
| CN104089819A (en) | Test bed for testing axial load and axial deformation of anchor rod and test method for test bed | |
| CN204330275U (en) | A kind of air pressure drives ejection type horizontal impact platform | |
| CN102998074A (en) | Device and method for testing vibration performance of basic translation flexible beam | |
| US20220196515A1 (en) | Long-Duration Shock Testing Machine | |
| CN108408088B (en) | Two-dimensional unfolding zero-gravity simulation device and method based on constant force spring | |
| CN111111131B (en) | Linear high-throw flying disc device | |
| CN114199496B (en) | High-magnitude classical impact test device and using method thereof | |
| CN104748936B (en) | Box Vertical-launched Missile missile wing launches flow tunnel testing device | |
| US9389058B2 (en) | Transducer-actuator systems and methods for performing on-machine measurements and automatic part alignment | |
| CN114232584A (en) | Electromagnetic hammering head for seabed in-situ dynamic sounding equipment | |
| CN204008301U (en) | A kind of testing table of testing anchor pole axial load and axial deformation | |
| CN103115745B (en) | Hypersonic shock tunnel hanging pendulum type relief means | |
| Wu et al. | Loading rate effect on woven glass laminated plates by penetration force | |
| RU2406074C2 (en) | Impact test stand |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |