Dynamic properties of high-purity beryllium

Abstract

Tests were conducted on high-purity beryllium plate to determine the Hugoniot equation of state and shock wave profile up to 50 kbar, and the spall threshold for elastic pulse widths of 0.2, 0.4, and 0.8 jusec, using flat-plate impact techniques. Tests were carried out at material temperatures of 22°C and 260°C. This beryllium was found to have a two-wave elasticplastic structure with a highly ramped transition from the elastic precursor to the plastic wave. No change in the material equation of state was observed for a temperature increase of 22°C to 260°C. The spall threshold (as defined by the onset of microcracking) was found to be time dependent, with impact velocity required for spall increasing with decreasing pulse width, and temperature dependent, with velocity increasing with increasing temperature.

Atomic, Crystal, Elastic, Thermal, Nuclear, and Other Properties of Beryllium

“…The elastic stiffness constants from six different published sources were compared to illustrate the variable results obtained for beryllium. 12 These data are tabulated in Table II Fig. II-2-11.…”

“…The principal isotopes of beryllium that have been identified are: 6 Be, 7 Be, 8 Be, 9 Be, and 10 Be. 5 Additional isotopes listed are: 11 Be, 12 Be, and 14 Be. 28 Some properties of the principal beryllium isotopes are listed in Table II-4-1 and II-4-2.…”

“…A number of elastic properties reported for VHP S-200E are listed in TableII-2-4. 12 Tests were performed in the pressing direction and in two orthogonal directions perpendicular to the pressing direction. The measured values indicated that there was little anisotropy in the pressed beryllium; however, the calculated values (Lamé's parameter a and Poisson's ratio) showed significant differences.…”

Characterization of shocked beryllium

“…Although beryllium has many unique properties, there is surprisingly little recent literature on its dynamic behavior [1][2][3][4][5]. The limited published work on the dynamic and shock loading behavior drives the need for work in this area.…”