Elastic impact of a bar on a half-space

✍ Scribed by W. Janach

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 637 KB
• Volume: 41
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(75)80180-5

✦ Synopsis

When a semi-infinite bar impacts on a half-space, the pressure and particle velocity at the contact surface jump to a value which is given by the impedances of the two materials. "The presence of the half-space is gradually felt by the bar as an increase of effective impedance. As a result, the contact pressure starts to increase while the velocity keeps decreasing. Whert the contact surface eventually comes to rest, the pressure reaches a final value. This transition between the initial jump and the final state is investigated. A simple model is derived for small impact velocities and linear elastic material behaviour based on the assumption of a linear pressure-penetration relationship. Impact experiments of an aluminium and a plexiglas bar on a plexiglas block with a velocity of 1 to 2 m/s show good agreement with results from the model.