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12EXPERIMENTAL INVESTIGATION OF DYNAMIC STRENGTH AND STRUCTURAL TRANSFORMATIONS OF GRAPHITE BY LASER NANO-
AND PICOSECOND ACTIONS
Krasyuk I.K.1, Bazhulin A.P.1, Semenov A.Yu.1, Stuchebryukhov I.A.1, Belikov R.S.2, Khishchenko K.V.2, Rosmej O.N.3, Rienecker T.3,
3 3
Schoenlein A. , Tomut M.
1 A.M. Prokhorov General Physics Institute of RAS, 11991 Moscow, Russia Joint Inst. for High Temperatures RAS, Moscow, Russia GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
On the laser facilities "Kamerton-T" (GPI RAS, Moscow, Russia) and PHELIX (GSI, Darmstadt, Germany) spallation phenomena were studied experimentally in graphite targets with nano- and picosecond shock-wave action. In the range of strain rates from 106 to 2-107 s-1 at the first time, data of dynamic mechanical
7 _1
strength of this material were obtained. With realized strain rate of 1.4-10 s , the spall strength value 2.1 GPa has been achieved that is 64 % of the theoretical tensile strength of the graphite. By using the optical and scanning electron microscopy, it was studied the morphology of the front and rear surfaces of the targets. Raman scattering method was used to investigate the structure of the graphite in the area of laser radiation on facial surface of the target as well as on its rear side in the spallation zone. A comparison of the dynamic strength of the graphite with the dynamic strength of a synthetic diamond [1] is done.
Fig. 1. The dependence of spall strength of graphite on the strain rate.
1-108
1. S.A. Abrosimov, A.P. Bazhulin, A.P. Bol'shakov, et al. Quantum Electronics 44
(6) 530 - 534 (2014).
3.5
1-106 1-107
Strain rate, 1/s
