Hopkinson bar test equipment based on rubber band launching device

Abstract

The utility model discloses Hopkinson bar test equipment based on a rubber band transmitting device. The Hopkinson bar test equipment comprises a base, a platform, a clamp, a transmitting device, an incident bar, a transmission bar, an absorption bar and a damper, a plurality of bases are arranged at the bottom of the platform, and a launching device is arranged at the end of the upper side; the launching device comprises a shell, a bullet, a positioning pile and a rubber band; the bottom of the shell is fixed on the platform, a track is arranged in the shell, and stretching tracks are arranged on two sides; the bullet is positioned in the track and can translate along the track; handles are arranged on two sides of the bullet, are positioned in the stretching track and can translate along the stretching track; the positioning piles are fixed on the platform on the two sides of the launching device; the two ends of the rubber band are arranged on the two positioning piles in a sleeving mode respectively and penetrate through the track and the stretching track. According to the utility model, the mechanical property test cost of the material under the condition of high strain rate can be reduced, the stability and repeatability of the test are improved, and the test equipment is more compact and is convenient to transport, install and use.

Description

TECHNICAL FIELD

[0001] The utility model relates to material mechanics performance test field, especially relate to a Hopkinson bar test equipment based on rubber band launching device. BACKGROUND

[0002] In engineering field, such as car, aviation, spaceflight, ocean, nuclear power, weapon and the like, many structures or components will be subjected to high speed impact or explosion and the like strong dynamic load effect. Therefore, the mechanical performance of the material under high strain rate condition must be considered in design and use. Hopkinson bar test equipment establishes nearly uniform stress and strain state in the test piece interior through the compression stress wave generated by high speed impact, so as to obtain the stress strain curve of the material under high strain rate. At present, Hopkinson bar test equipment has been widely applied in the mechanical performance research of engineering material under high strain rate condition.

[0003] However, the traditional Hopkinson bar launching device mostly uses gas driven bullet to impact, and this mode is effective, but has some limitations in actual operation. Firstly, the traditional pneumatic Hopkinson bar has problems of low pressure instability, high pressure difficulty, poor repeatability of test results and the like. Secondly, the gas cylinder and air gun required by the gas driven device are relatively expensive, which increases the economic burden of the test. Thirdly, the gas cylinder and air gun are independent of each other, and need to be respectively installed and connected before the test is carried out, which leads to that the test equipment is not simple and compact, and is not conducive to transportation and installation. Therefore, it is necessary to improve the launching device of Hopkinson bar to solve the above problems. UTILITY MODEL CONTENT

[0004] The utility model aims at the deficiency of prior art, and proposes a Hopkinson bar test equipment based on rubber band launching device, which effectively reduces the economic cost of test, increases the stability and convenience of test equipment and the like.

[0005] The specific adopted technical scheme is:

[0006] A Hopkinson bar test equipment based on a rubber band launching device, comprising a base, a platform, a clamp, a launching device, an incident bar, a transmission bar, an absorption bar and a damper; the bottom of the platform is provided with a plurality of bases, and the upper end is provided with the launching device; the launching device comprises a shell, a bullet, a positioning pile and a rubber band; the bottom of the shell is fixed on the platform, the inside is provided with a track, and the two sides are provided with stretching tracks; the bullet is located in the track and can move horizontally along the track; the two sides of the bullet are provided with handles, the handles are located in the stretching tracks and can move horizontally along the stretching tracks; the positioning pile is fixed on the platform on the two sides of the launching device, and the top is provided with an anti-skid block; the two ends of the rubber band are sleeved on the two positioning piles and pass through the track and the stretching track and are located between the inside of the track and the bullet; the upper side of the stretching track is provided with a scale; when the bullet contacts the rubber band without interaction force, the rubber band is taut and straight, and one side of the bullet handle is located at the starting point of the scale; when the bullet moves to the terminal point of the scale, the part of the rubber band contacting the bullet can be forced to move horizontally into the track, so that the whole rubber band is deformed and generates elastic potential energy; the incident bar, the transmission bar and the absorption bar are sequentially arranged on the platform on one side of the launching device; the central axes of the incident bar, the transmission bar and the absorption bar coincide with the central axis of the bullet, and are fixed on the platform through the clamp and can move horizontally along the axis; the rear end of the absorption bar is provided with the damper fixed on the platform.

[0007] The Hopkinson bar test equipment based on the rubber band launching device replaces the traditional compressed gas driving device with the launching device with the rubber band, and utilizes the elastic potential energy of the rubber band to provide kinetic energy for the bullet.

[0008] The Hopkinson bar test equipment based on the rubber band launching device has the following beneficial effects:

[0009] 1. The launching device utilizes the elastic potential energy of the rubber band to provide kinetic energy for the bullet, the energy storage and release of the rubber band are very stable, the kinetic energy of the bullet is the same as long as the stretching degree of the rubber band is the same, and therefore the repeatability and stability of the test are better.

[0010] 2. The launching device has a simple structure, the rubber band providing kinetic energy for the bullet has a low cost, and therefore the manufacturing cost of the test equipment is lower.

[0011] 3. The launching device with the rubber band has better integration, and therefore the transportation and installation of the test equipment are more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of an embodiment of the utility model.

[0013] Figure 2 is a structural schematic diagram of a launching device in an embodiment of the utility model.

[0014] Figure 3 is a structural schematic diagram of a bullet in an embodiment of the utility model.

[0015] Figure 4 is a structural schematic diagram of a track and a stretching track of a launching device in an embodiment of the utility model. DETAILED DESCRIPTION

[0016] A Hopkinson bar test equipment based on a rubber band launching device, comprising a base 1, a platform 2, a clamp 3, a launching device 4, an incident bar 5, a transmission bar 6, an absorption bar 7 and a damper 8;The bottom of the platform 2 is provided with a plurality of bases 1, and the upper end is provided with a launching device 4;The launching device 4 comprises a shell 9, a bullet 10, a positioning pile 11 and a rubber band 12;The bottom of the shell 9 is fixed on the platform 2, the inside is provided with a track 13, and the two sides are provided with a stretching track 14;The bullet 10 is located in the track 13 and can move horizontally along the track 13;The bullet 10 is provided with a handle 15 on both sides, and the handle 15 is located in the stretching track 14 and can move horizontally along the stretching track 14;The positioning pile 11 is fixed on the platform 2 on both sides of the launching device 4, and the top is provided with an anti-skid block 16;The rubber band 12 is sleeved on the two positioning piles 11 respectively, and passes through the track 13 and the stretching track 14, and is located between the inside of the track 13 and the bullet 10. The upper side of the stretching track 14 is provided with a scale 17;When the bullet 10 contacts the rubber band 12 without interaction, the rubber band 12 is taut and straight, and one side of the handle 15 of the bullet 10 is located at the starting point of the scale 17;When the bullet 10 moves towards the terminal point of the scale 17, it can force the part of the rubber band 12 in contact with the bullet 10 to move horizontally into the track 13, so that the whole rubber band 12 is deformed and generates elastic potential energy;The incident bar 5, the transmission bar 6, the absorption bar 7 and the damper 8 are sequentially arranged on the platform 2 on one side of the launching device 4;The axis of the incident bar 5, the transmission bar 6 and the absorption bar 7 coincides with the axis of the bullet 10, and is fixed on the platform 2 through the clamp 3 and can move horizontally along the axis;The rear end of the absorption bar 7 is provided with the damper 8 fixed on the platform 2.

[0017] The utility model discloses a bullet test device, including the launching device 4, the launching device 4 includes the fixed post 1, the fixed post 2, the fixed post 3, the fixed post 4, the fixed post 5, the fixed post 6, the fixed post 7, the fixed post 8, the fixed post 9, the fixed post 10, the fixed post 11, the fixed post 12, the fixed post 13, the fixed post 14, the fixed post 15, the fixed post 16, the fixed post 17, the fixed post 18, the fixed post 19, the fixed post 20, the fixed post 21, the fixed post 22, the fixed post 23, the fixed post 24, the fixed post 25, the fixed post 26, the fixed post 27, the fixed post 28, the fixed post 29, the fixed post 30, the fixed post 31, the fixed post 32, the fixed post 33, the fixed post 34, the fixed post 35, the fixed post 36, the fixed post 37, the fixed post 38, the fixed post 39, the fixed post 40, the fixed post 41, the fixed post 42, the fixed post 43, the fixed post 44, the fixed post 45, the fixed post 46, the fixed 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Claims

1. A Hopkinson bar test equipment based on a rubber band launching device, comprising a base (1), a platform (2), a clamp (3), a launching device (4), an incident bar (5), a transmission bar (6), an absorption bar (7) and a damper (8); the bottom of the platform (2) is provided with a plurality of bases (1), and the upper side end is provided with a launching device (4); the launching device (4) comprises a bullet (10); the incident bar (5), the transmission bar (6), the absorption bar (7) and the damper (8) are sequentially arranged on the platform (2) on one side of the launching device (4); the central axes of the incident bar (5), the transmission bar (6) and the absorption bar (7) coincide with the central axis of the bullet (10), and are fixed on the platform (2) through the clamp (3) and can move along the central axis; the rear end of the absorption bar (7) is provided with the damper (8) fixed on the platform (2); characterized in that: The launching device (4) further comprises a housing (9), a positioning stake (11) and a rubber band (12); the bottom of the housing (9) is fixed on the platform (2), the inside of the housing (9) is provided with a track (13), and both sides of the housing (9) are provided with a stretching track (14); the bullet (10) is located in the track (13) and can move horizontally along the track (13); both sides of the bullet (10) are provided with a handle (15), the handle (15) is located in the stretching track (14) and can move horizontally along the stretching track (14); the positioning stake (11) is fixed on the platform (2) on both sides of the launching device (4), and the top of the positioning stake (11) is provided with an anti-skid block (16); the rubber band (12) is sleeved on the two positioning stakes (11) at both ends and passes through the track (13) and the stretching track (14) and is located between the inside of the track (13) and the bullet (10); the upper side of the stretching track (14) is provided with a scale (17); when the bullet (10) is in contact with the rubber band (12) but there is no interaction force, the rubber band (12) has been stretched tightly and is in a straight shape, and one side of the handle (15) of the bullet (10) is located at the starting point of the scale (17); when the bullet (10) moves towards the terminal point of the scale (17), the part of the rubber band (12) in contact with the bullet (10) is forced to move horizontally into the track (13), so that the whole rubber band (12) is deformed.

Images