Observed physical processes in mechanical tests of PBX9501 and recomendations for experiments to explore a possible plasticity/damage threshold

Buechler, Miles A.¹ 

[1]Los Alamos National Laboratory

关键词: Materials Science(36);    COMPRESSION;    DATA ANALYSIS;    MECHANICAL TESTS;    MODIFICATIONS;    PLASTICITY;   

DOI  :  10.2172/1039687
RP-ID  :  LA-UR-12-21072
PID  :  OSTI ID: 1039687
Others  :  TRN: US201210%%140

美国|英语

来源: SciTech Connect

【 摘 要 】

This memo discusses observations that have been made in regards to a series of monotonic and cyclic uniaxial experiments performed on PBX9501 by Darla Thompson under Enhanced Surveilance Campaign support. These observations discussed in Section Cyclic compression observations strongly suggest the presence of viscoelastic, plastic, and damage phenomena in the mechanical response of the material. In Secton Uniaxial data analysis and observations methods are discussed for separating out the viscoelastic effects. A crude application of those methods suggests the possibility of a critical stress below which plasticity and damage may be negligible. The threshold should be explored because if it exists it will be an important feature of any constitutive model. Additionally, if the threshold exists then modifications of experimental methods may be feasible which could potentially simplify future experiments or provide higher quality data from those experiments. A set of experiments to explore the threshold stress are proposed in Section Exploratory tests program for identifying threshold stress.