An anti-incident rod recoil device for Hopkinson rod test

Abstract

The invention discloses an apparatus capable of preventing recoil of an input bar and used for Hopkinson bar tests. The apparatus comprises a barrier, a waxy filler, a stopping block and a pressure ring and is characterized by further comprising a support and the input bar, wherein the barrier is a diameter-variable cylinder internally provided with an annular boss; the end, with a smaller inner bore diameter, of the barrier faces the stopping block and filled with the waxy filler, and the waxy filler closely contacts with the stopping block; the end, with a larger inner bore diameter, of the barrier butts against the support; the stopping block is a cylinder with a plurality of steps at the external circumference; the end, with a smaller outer diameter, of the stopping block closely contacts with the waxy filler; and the end, with a larger outer diameter, of the stopping block is connected with the pressure ring. The apparatus provided by the invention can prolong buffer action time and reduce buffer action force without influence on the use functions of the input bar, so the apparatus can effectively prevent damage to the input bar and a loading system by recoil force generated in explosion of an energy-containing material sample and provides technical support for accurate measurement of the dynamic mechanical properties of energy-containing materials.

Description

technical field [0001] The invention belongs to the technical field of laboratory experimental devices for energetic materials, and relates to an anti-recoil device for preventing explosive gas from recoiling an object, in particular to an anti-recoil device for incident rods suitable for Hopkinson rod tests. Background technique [0002] Energetic materials need to withstand high-rate dynamic loads during normal use of weapons such as launching and penetrating. During these processes, the response of energetic materials is firstly manifested as a mechanical response, which may affect its detonation properties and detonation performance. With the development of modern high-performance weapon systems, the requirements for improving the safety of energetic materials under various conditions are becoming increasingly urgent, and the research on the dynamic mechanical properties of energetic materials is also receiving more and more attention. [0003] The Hopkinson rod test can...

AI Technical Summary

Problems solved by technology

In the traditional Hopkinson test, it is only necessary to add a recovery system at the end of the transmission rod to reduce the damage to the transmission rod due to impact; however, when the Hopkinson rod is used to carry out the mechanical properties of energetic materials, due to The particularity of it, it is very easy to explode under the action of impact. At this time, the high-temperature and high-pressure explosive gas products not only produce a strong impact force on the transmission rod along its moving direction, but also produce a Very strong impact force, the recoil force acts on the incident rod, making the incident rod obtain a high reverse movement speed, which can easily lead to bending deformation of the incident rod, and even cause damage to the entire loading system

Qin Jingui reported a buffer structure to prevent the recoil of the incident rod in his doctoral thesis "PBX explosive non-shock ignition mechanism experiment and numerical simulation research" (National University of Defense Technology, October 2014). The buffer structure is made of rubber, Composed of foam, it is installed on the incident rod close to the left side of the support to absorb reverse impact energy, but the buffer structure has a short action time and a large force during buffering, which makes the incident rod prone to rebound and secondary damage

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