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2 Central European Journal of Energetic Materials

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Verification of Impact Energy Delivered by a Drop Weight

Künzel Martin, Kucera Jindrich, Smid Jakub, Horkel Jan

Central European Journal of Energetic Materials

2024

Vol. 21, no. 2

171--187

Impact sensitivity of energetic materials is an important parameter for their safe handling and storage. The drop height or equivalent potential energy that is required to reach a certain probability of initiation in repeated tests is determined using a drop-weight instrument. In this work, photonic Doppler velocimetry was used to measure the drop weight velocity profile during its fall and rebound. Numerical simulations were performed to correctly understand the velocity records and to find out the differences from the ideal behavior. The efficiency of the conversion from the potential to kinetic energy was revealed for various drop weight masses and drop heights. The measured velocities at the moment of impact followed the free-fall predictions to within 1%. The energy conversion efficiency decreased from 0.997 to 0.992 with the drop weight decrease from 10 to 0.5 kg. The relative energies of the rebound drop-weights decreased with decreasing mass from >0.75 at 2-10 kg down to <0.4 at 0.5 kg. The PDV instrumentation was found useful for validating the drop-weight velocity. The resting times and rebound velocity profiles of the drop-weights agreed with the numerical simulation results that assumed elastic behavior of the instrument.

Detonation Parameters of PlSEM Plastic Explosive

Cardoso Aline Anastacio, Selesovsky Jakub, Künzel Martin, Kucera Jindrich, Pachman Jiri

Central European Journal of Energetic Materials

2019

Vol. 16, no. 4

487--503

PlSEM is a plastic explosive based on RDX, PETN and a non-explosive binder, and is used in linear shaped charges for demolition purposes. Its experimentally obtained detonation parameters are presented in the present paper. The detonation velocity was measured for cylindrical charges of various diameters, with and without confinement. The detonation pressure and particle velocity were determined using an impedance window matching technique, and cylinder tests were used to obtain the parameters of the JWL equation of state of the detonation products. Detonation velocities from 7.75 to 8.05 km·s–1 were obtained for unconfined charges with diameters from 4 to 8 mm, and from 8.15 to 8.24 km·s–1 for charges with 25 mm diameter. The experimentally determined detonation pressure was found to be 24.6 GPa.