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Thursday, July 11 • 11:20 - 11:40
MEASURING THE WAVE SHAPE AND WAVE PROPAGATION SPEED OF TWO IMPACTING RODS OF ARBITRARY CROSS SECTION AND MATERIAL

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Impacting rods are used both in experimental set-ups such as the Split-Hopkinson pressure bar and in practical applications as the percussion driller. Understanding the wave propagation phenomena is crucial to improve these devices. In this contribution, a single-hit test rig to measure the wave shape and propagation of axially dependent impacting rods has been set up. It consists of a pneumatic gun that accelerates a piston which hits a second rod at known initial velocity. The impact is recorded by a high-speed camera that leads, in turn, to a better insight of the hit and enables the interpretation of the measurement results. At the rod, up to eight strain gauges are attached which measure the stress wave at different positions and at very high frame rates at the same time. Thus, the evolution of the stress wave shape and the wave propagation speed can be determined. The main challenge in measuring is to achieve a good balance between a high bandwidth of the signal, which is necessary to attain sharp wave shapes and acceptable noise. The obtained results are repeatable and in good accordance with a numerical model, that has been implemented based on the Wave Finite Element Method.

Moderators
LH

Lars Håkansson

professor, Linnaeus University

Authors

Thursday July 11, 2019 11:20 - 11:40 EDT
Westmount 2
  T01 Ac. meas. & instrum., RS04 Instr fr snd & vibr measur & anl