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Hugoniot data of Seeberger sandstone up to 7 GPa
|International Journal of Impact Engineering 99 (2017), S.122-130|
|European Commission EC|
FP7; 277290; NEOShield
|Fraunhofer EMI ()|
Planar-plate impact tests were carried out for the measurement of Hugoniot data of dry Seeberger sandstone in the pressure range of up to 7 GPa. A special inverse testing method suitable for rock targets was applied together with a laser interferometer for the measurement of the free-surface velocity of the target plate required for the calculation of the particle velocity (up) and the shock wave velocity (US) in the sandstone specimen. In our measurement range (impact velocity between about 50m/s and about 1300 m/s), the US – up data show significant scattering. The travel times of the impact-induced shock waves indicate that pore crushing occurs. A strong dependance of the US – up data on the test batch selected for the impact experiments and, thus, on the mining location was observed. This dependance is greater than the scattering of the individual data sets.