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Shock compressibility and spall strength of textolite depending on fiber orientation

Mochalova V. M., Utkin A. V., Rykova V. E., Endres M., Hoffmann D. H. H.

Archives of Mechanics

2019

Vol. 71, nr 4-5

417--431

The experimental study of shock wave compressibility and spall strength of an aramid fiber reinforced epoxy composite (textolite) for two fiber orientations was performed by the VISAR interferometer. The particle velocity profiles were obtained at velocities of the flyer plate from 0.65 to 5.05 km/s. The sound speed of textolite for the longitudinal direction is three times higher than that for transverse one, and as a result, the particle velocity profiles are different for two orientations. For the transverse direction of the fibers, a single shock wave is observed, while for longitudinal one, a two-wave configuration is recorded up to 20 GPa. Hugoniot parameters for both orientations of the fibers were found up to 35 GPa: D = 2.37 + 1.26 ∗ u – for transverse one and D = 1.45 + 2.05 ∗ u – for longitudinal, where D is the shock wave velocity and u is the particle velocity. The spall strength of textolite is equal to 61 MPa for shocks traveling along the fibers, and this is almost twice higher than that for the transverse direction.

Diagnostics of laser-produced plasmas

Batani D., Morace A., Maheut Y., Jakubowska K., Volpe L.

Nukleonika

2016

Vol. 61, No. 4

393--401

We present the general challenges of plasma diagnostics for laser-produced plasmas and give a few more detailed examples: spherically bent crystals for X-ray imaging, velocity interferometers (VISAR) for shock studies, and proton radiography.

Rate of the energy release in high explosives containing nano-size boron particles

Kanel G. I., Utkin A. V., Razorenov S. V.

Central European Journal of Energetic Materials

2009

Vol. 6, nr 1

15-30

With a goal to obtain information on rate of the high explosive decomposition and equation of state of the HE formulations and detonation products, measurements of the pressure and particle velocity profiles of shock and detonation waves have been performed for pure coarse-grain and fine-grain HMX and for the HMX+16.4% boron mixture. For these measurements, the manganin pressure gauges and the laser Doppler velocimeter VISAR were applied. Effect of boron in the energy release process was observed both in the detonation and shock-wave initiation regimes.