The Button Head Bullet Effects on the Incident Pulse of Split Hopkinson Press Bar

Abstract:

In order to make the specimen deformed under a constant strain rate and the stress in the specimen kept homogeneous, the wave shaper technology was adopted to modify the incidence waves of the normal Split Hopkinson Press Bar. A method of changing the shape of the bullet was suggested to be applied on the SHPB. Bullets with different length and different curvature have been researched in this paper. And the effection of the button head bullet about incidence pulse was simulated with Lagrange method by ANSYS/LS-DYNA. It is shown in the results that changing the curvature of the bullet impact the rising edge of incidence waves, and the peak stress increase with the speed of the bullet increase, the peak stress and length of incidence waves increased with the length of the button head bullet, when the peak stress reached a certain strength, increasing the bullet length could make the stress peak value lasted longer. Due to the reason that the button head bullet was based on the elastic wave theory, the wave length and the max stress of the shaped wave would be controlled conveniently and avoid the shortcoming that the analogue specimens could not be recycled in the normal pulse shaper technology.

• Periodical: Applied Mechanics and Materials (Volume 782)
• Pages: 311-315
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.782.311
• Online since: August 2015
• Authors: Jia Qu*, Geng Chen, Guang Ping Zou
• Keywords: Elastic Wave Theory, Finite Element Methods, Pulse Shape, Split Hopkinson Press Bar

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