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2 Journal of Theoretical and Applied Mechanics

2 2018

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The influence of non-axisymmetric pulse shaper position on SHPB experimental data

Panowicz R., Janiszewski J., Kochanowski K.

Journal of Theoretical and Applied Mechanics

2018

Vol. 56 nr 3

873—886

The results of experimental and numerical analysis of the influence of the non-axisymmetric pulse shaper position on recorded wave signals in the split Hopkinson pressure bar experiment are presented. The paper focuses attention on the problem of wave signal disturbances caused by a bending wave resulting from non-axisymmetric pulse shaper positions and, moreover, different shaper thickness, striker impact velocities and Wheatstone bridge configurations. The obtained results of analyses indicate that the effect of the non-axisymmetric pulse shaper position may be neglected if deviation from the bar axis does not exceed 20%.

Influence of pulse shaper geometry on wave pulses in shpb experiments

Panowicz R., Janiszewski J., Kochanowski K.

Journal of Theoretical and Applied Mechanics

2018

Vol. 56 nr 4

1217--1221

Results of numerical analysis of the influence of pulse shaper geometry on wave signals in the split Hopkinson pressure bar experiment are presented. Five pulse shapers, i.e. square, ring, cross, star and disk ones have been analysed. It has been assumed that the disc pulse shaper is the reference geometry to assess the remaining types of pulse shapers. The results of numerical analyses have shown that pulse shapers with shapes different than disk are highly capable of minimizing high-frequency Pochhammer-Chree oscillations and, thus, reduce dispersion of waves propagating in the bar. The greatest damping ability has been observed while using the ring pulse shaper at both low and high impact velocities of the striker.