Device and method for realizing pull/press impact fatigue test based on Hopkinson pull rod

Abstract

The invention discloses a device and a method for realizing a pull / press impact fatigue test based on a Hopkinson pull rod, and belongs to the field of material impact fatigue performance test. The device comprises a reaction mass block, an energy absorber, an energy transmission rod, a positioning pin, a transmission flange, a pulse generator, a vacuum recovery device, an emission device, a resistance strain gauge, an incident rod, a transmission rod and an energy absorption sleeve. The energy transfer rod, the positioning pin, the incident rod and the transmission rod are coaxially arranged in sequence, and a sample is mounted between the incident rod and the transmission rod; the energy absorber is mounted between the reaction mass block and the energy transfer rod, is connected with the energy transfer rod through a push-back spring and is used for absorbing energy in the energy transfer rod; the pulse generator and the transmitting device are sleeved on the incident rod and are used for generating incident pulses; and the energy absorption sleeve sleeves the free end of the transmission rod. According to the invention, quantitative control and real-time test and display of impact force and shock wave configuration can be realized, and key technologies such as high-frequency continuous impact loading and the like can be realized.

Description

Technical field [0001] The present invention belongs to the field of material impact fatigue performance test, and in particular to device and method based on Hopkinson pulling rod to achieve pull / pressure impact fatigue test. Background technique [0002] In the fields of aerospace, transportation, weapons, etc., materials are difficult to avoid facing various extreme mechanical environments, in which impact is one of common seriously loaded methods. This way of loading often has high impact speed, short duration, and the load instantaneous increases from 0 to the peak, and the time to reach the peak is microseconds to milliseconds. Materials are prone to damage under impact loading, these fine damage is gradually accumulated and sprouting microcracks under multiple repetitions, accelerating crack expansion, eventually leading to material damage. Unlike conventional static loading, impact fatigue requires consideration of strain rate effects during material loading and accompa...

AI Technical Summary

Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a device and method for realizing tension / compression impact fatigue tests based on Hopkinson tie rods, which effectively solves the problems of low strain rate and single loading mode in the prior art, and can quantitatively Key technologies such as precise control and real-time testing and display of impact force and shock wave configuration, and realization of high-frequency continuous impact loading

Images