Study of Relaxation of Elastic Precursor in Natural Uranium

摘要

Laser interferometry was used to investigate elastic precursor relaxation in natural uranium. Samples with the thickness of 0.5–10 mm were loaded by shock wave pulse with the pressure of 13 and 17 GPa. In this particular thickness range elastic precursor amplitude attenuates from 4.72 GPa to 1.44 GPa. The resulting experimental data on elastic precursor attenuation are extrapolated well by the dependence el=3.4x–0.4. The present paper for the first time cites experimental data for the thickness range of 0.5–2mm. As was shown, elastic precursor attenuates 10 and more times stronger in the aforementioned thickness range as compared to that of 2.. 10 mm. This should be attributed to intensive onset of dislocation, development of defect structure in a material, and energy dissipation.