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Specific Features of Spallation Processes in Polymethyl Methacrylate Under High Strain Rate
Author(s) -
Geras'kin A.A.,
Khishchenko K.V.,
Krasyuk I.K.,
Pashinin P.P.,
Semenov A.Yu.,
Vovchenko V.I.
Publication year - 2009
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200910044
Subject(s) - spallation , spall , materials science , strain rate , laser , sapphire , aluminium , composite material , foil method , range (aeronautics) , moment (physics) , acceleration , laser ablation , mechanics , optics , neutron , physics , nuclear physics , classical mechanics
Direct laser interaction and laser‐driven thin foils were used for investigation spallation phenomena inpolymetyl metacrylate (PMMA) targets in case of high strain rate. The aluminium foils with thickness 8 and 15 mkm were used as impactors. Mass and velocity of the laser‐driven foils after laser ablation and acceleration were determined by the method of foil deceleration in a gas atmosphere. Basing on experimental data, we determined the spallation plane position and the moment for the spall layer to arrive at an additional electrocontact sensor located beside the rear side of the target. Then the spall strength and strain rate have been calculated numerically using a hydrodynamic code based on a wide‐range semi‐empirical equation of state for PMMA. As a result of these experiments, we have for the first time shown that the ultimate spall strength of PMMA (about 10 kbar) is achieved in case of strain rate ranging 1.5 × 10 6 to 6 × 10 6 1/s (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)