Behavior of Porous Beryllium under Thermomechanical Loading. Part 2. Quasi-Static Deformation.

摘要

Loading and unloading of two types of porous beryllium under conditions of uniaxial strain and hydrostatic pressure indicate that the total volume change before the onset of yielding is small and that there is a maximum stress-porosity function which describes pore-collapse, independent of loading and unloading cycles. Comparison of the data taken prior to yielding with theoretical models shows the influence of aspherical pores which result in increased compressibility on initial loading. Initial yielding is much more distinct in the sintered than in the unsintered material and is believed to be an indication of the presence of pores of higher average sphericity produced by the sintering process. Both materials exhibit shear-enhanced compaction when loaded in unaxial strain. (Author)