The uniaxial strain compression of porous and fully dense beryllium

Abstract

Compressive stress versus uniaxial compressive strain curves obtained using a simple closed die are presented for SP-100-C beryllium of initial fractional porosities varying from 0.05 to 0.26, and for fully dense ingot beryllium. The relationship between porosity and compressive yield stress is found to be linear over the entire porosity range with a discontinuity at 0.065 fractional porosity. It is suggested that the discontinuity is related to the transition from isolated to predominantly interconnected porosity.

It is deduced that the pressure required for full compaction varies with density and is estimated to range from 3.65×10³ MN m⁻² at 0.05 to 17.2×10³ MN m⁻² at 0.26 fractional porosity.