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Initiation of electrical breakdown in vacuum by microparticles

100%

Zakrzewski S. , Opydo W.

2006

tom No 52

167-171

The paper deals with the possibilities for initiating electrical breakdown in vacuum by microparticles. Duration of the travel of charged spherical microparticles of various diameters accelerated by the electric field, and their velocities in the moment of impact against the electrode of opposite polarity are calculated. It was shown that the velocities are sufficiently high to induce plastic deformations of surfaces of the electrodes. The calculation was carried out in the Matlab environment.

Research on influence of impact of microparticles and sewing needles on destruction of solid bodies

41%

Khristoforov B. D.

tom Vol. 58, iss. 3/4

131-138

Impact of powders and sewing needles accelerated by explosion on various obstacles has been studied. Formation of channels up to 100 particle diameters in length has been observed when corundum and tungsten powders impacts on steel and duralumin at speeds up to 2 km/s. A mechanism of such super deep penetration of powder jets into metals has been proposed. The possibility of destroying by needles such objects as plexiglass blocks, antimeteorite screens, containers with elastic and explosive materials with a released energy exceeding the energy of needles has been shown. At impact speeds up to 400 m/s the depth of needles penetration into metals is 3-5 times higher than the one calculated for pointed rods at plastic work. The obtained results can be useful for modeling of impact of meteorites, space scraps and technological wasteson space aircrafts and their components.