Hopkinson bar test equipment based on spring launching device

Abstract

The utility model discloses Hopkinson bar test equipment based on a spring transmitting device. The Hopkinson bar test equipment comprises a supporting base, a mounting plane, a clamp, a transmitting device, an incident bar, a transmission bar, an absorption bar and a damper, the launching device comprises a fixed block, a shell, a spring and a bullet; a shell is arranged on the side surface of the fixed block, and the bottom surface is fixed at one end of the mounting plane; a track is arranged in the shell, and a spring and a bullet are sequentially arranged in the track from inside to outside; stretching rails are arranged on the two sides of the shell, and graduated scales are arranged on the upper sides of the stretching rails; handles are arranged on the two sides of the bullet; the bullets can translate along the rails by pulling the handles on the two sides; according to the Hopkinson bar test equipment based on the spring launching device, the launching device is improved, so that the test cost can be reduced, the test stability and repeatability can be improved, and the test equipment is more compact and convenient to transport, install and use.

Description

TECHNICAL FIELD

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

[0002] In engineering field, many structures or components will be subjected to high-speed impact or explosion and other strong dynamic load, such as automobile, aviation, aerospace, ocean, nuclear power, weapon, etc. Therefore, the mechanical properties of the materials used under high strain rate conditions must be considered in design and use. Hopkinson bar test equipment generates compression stress wave through high-speed impact, establishes nearly uniform stress and strain state inside the test piece, and obtains stress-strain curve of the material under high strain rate. Currently, Hopkinson bar test equipment has been widely used in the study of mechanical properties of engineering materials under high strain rate conditions.

[0003] However, the traditional Hopkinson bar launching device mostly uses gas-driven bullet for impact. Although this method is effective, it has some limitations in actual operation. First, the traditional pneumatic Hopkinson bar has problems such as instability at low pressure, difficulty in increasing at high pressure, and poor repeatability of test results. Second, the gas cylinder and air gun required by the gas-driven device are expensive, increasing the economic burden of the test. Third, the gas cylinder and air gun are independent of each other, and need to be installed and connected separately before the test, which makes the test equipment 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. SUMMARY

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

[0005] The specific technical scheme is:

[0006] A Hopkinson bar test equipment based on spring launching device, comprising support base, installation plane, clamp, launching device, incident bar, transmission bar, absorption bar and damper, the bottom of the installation plane is provided with a plurality of support bases, and the upper side end is provided with a launching device;The launching device comprises a fixed block, a shell, a spring and a bullet;The shell is arranged on the side of the fixed block, and the bottom is fixed on one end of the installation plane;The inside of the shell is provided with a track, and the inside of the track is sequentially provided with a spring and a bullet from inside to outside;Stretching tracks are arranged on both sides of the shell, and a scale is arranged on the upper side of the stretching track;Handles are arranged on both sides of the bullet;When the bullet is in the track, the handles on both sides are also in the stretching track;Pulling the handles on both sides, the bullet can move along the track by compressing the spring;The incident bar, the transmission bar, the absorption bar and the damper are sequentially arranged on the installation plane on one side of the launching device;The central axis lines of the incident bar, the transmission bar and the absorption bar coincide with the central axis line of the bullet, and are fixed on the installation plane by the clamp and can move along the axis;The damper is arranged behind the absorption bar and fixed on the installation plane.

[0007] The utility model provides a kind of Hopkinson bar test equipment based on spring launching device, using the launching device with spring to replace traditional compressed gas driving device, utilize the elastic potential energy of spring to provide kinetic energy for bullet.Only need to adjust the compression length of spring, the bullet with different initial velocity can be obtained;Replace the spring with different elastic modulus, the incident velocity of bullet can also be changed, so as to realize the accurate control of bullet speed.

[0008] The utility model provides a kind of Hopkinson bar test equipment based on spring launching device, with the following beneficial effects:

[0009] 1, the launching device uses the elastic potential energy of spring to provide kinetic energy for bullet, since the energy storage and release of spring itself is very stable, as long as the compression degree of spring is same, the kinetic energy of bullet is same, so the repeatability and stability of test are better.

[0010] 2, since the structure of the launching device is simple, the spring that provides kinetic energy for bullet is low in cost, so the manufacturing cost of the test equipment provided by the utility model is lower.

[0011] 3, the launching device with spring is better in integration, so the transportation and installation of the test equipment provided by the utility model are more convenient. ACCURACY

[0012] Figure 1 It is the structure schematic diagram of the utility model embodiment.

[0013] Figure 2 It is the structure schematic diagram of the launching device in the utility model embodiment.

[0014] Figure 3 Figure 3 is a schematic diagram of a track and a stretching track structure of the launching device in the embodiment of the present application.

[0015] Figure 4 Figure 4 is a schematic diagram of a bullet structure of the launching device in the embodiment of the present application.

[0016] Figure 5 Figure 5 is a sectional view of the launching device in the embodiment of the present application. DETAILED DESCRIPTION

[0017] A Hopkinson bar test equipment based on a spring launching device, comprising a support base 1, a mounting plane 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 mounting plane 2 is provided with a plurality of support bases 1, and the upper end is provided with the launching device 4; the launching device 4 comprises a fixed block 9, a shell 10, a spring 11 and a bullet 12; the side of the fixed block 9 is provided with the shell 10, and the bottom is fixed to one end of the mounting plane 2; the inside of the shell 10 is provided with a track 13, and the inside of the track 13 is sequentially provided with the spring 11 and the bullet 12 from inside to outside; the two sides of the shell 10 are provided with stretching tracks 14, and the upper side of the stretching track 14 is provided with a scale 15; the two sides of the bullet 12 are provided with handles 16; when the bullet 12 is in the track 13, the handles 16 on the two sides are also in the stretching track 14; the handles 16 on the two sides are pulled, and the bullet 12 can move along the track 13 by compressing the spring 11; the incident bar 5, the transmission bar 6, the absorption bar 7 and the damper 8 are sequentially arranged on the mounting plane 2 on one side of the launching device 4; the axis lines of the incident bar 5, the transmission bar 6 and the absorption bar 7 coincide with the axis line of the bullet 12, and are fixed on the mounting plane 2 through the clamp 3, and can move along the axis line of the bullet 12; the damper 8 fixed on the mounting plane 2 is arranged behind the absorption bar 7, and can consume the kinetic energy of the absorption bar 7; when the bullet 12 is in contact with the spring 11, but the spring 11 has not been deformed, one side of the handle 16 is just located at the starting point of the scale 15.

[0018] The utility model discloses a structure simple, and the manufacturing cost of spring 11 is relatively lower, thus, the economic cost of material performance test is also lower. In addition, due to the integrated design of launching device 4, the integration is stronger, and transportation and installation are also more convenient. It needs to be specially pointed out that the strain gauge, strain acquisition instrument and data storage equipment and the like equipment that need to be matched with the present test equipment, and the method of test development and data processing, all belong to the well-known technology, thus, details are not repeated.

Claims

1. A Hopkinson bar test equipment based on spring launching device, comprising support base (1), installation plane (2), clamp (3), launching device (4), incident bar (5), transmission bar (6), absorption bar (7) and damper (8); the bottom of the installation plane (2) is provided with a plurality of support bases (1), and the upper side end is provided with the launching device (4); the launching device (4) comprises a bullet (12); the incident bar (5), the transmission bar (6), the absorption bar (7) and the damper (8) are sequentially arranged on the installation plane (2) on one side of the launching device (4) along the axis of the bullet (12); the axes of the incident bar (5), the transmission bar (6) and the absorption bar (7) coincide with the axis of the bullet (12), and are fixed on the installation plane (2) through the clamp (3) and can translate along the axis of the bullet (12); the absorption bar (7) is provided with the damper (8) fixed on the installation plane (2) behind; characterized in that: The launching device (4) further comprises a fixed block (9), a shell (10), a spring (11); the fixed block (9) is provided with the shell (10) on the side surface, and is fixed on one end of the installation plane (2) on the bottom surface; the shell (10) is internally provided with a track (13), the track (13) is internally provided with the spring (11) and a bullet (12) from inside to outside in sequence, the bullet (12) can move along the track (13) by compressing the spring (11); the shell (10) is provided with a stretching track (14) on both sides, the stretching track (14) is provided with a scale ruler (15) on the upper side; the bullet (12) is provided with a handle (16) on both sides, the handle is located in the stretching track (14) and can move along the stretching track (14); when the bullet (12) is in contact with the spring (11), but the spring (11) does not produce deformation, one side surface of the handle (16) is located at the starting point of the scale ruler (15).

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