EXPERIMENTAL STUDY ON THE DAMAGE EVOLUTION OF POLYMER BONDED EXPLOSIVES MATERIAL USING DIGITAL SPECKLE CORRELATION METHOD

摘要

Considering with the spatial characteristics of concentrated deformation field caused by the micro-cracks concentration and localization in PBXS material, a new damage variable is defined based on the standard deviation of the strain fields of polymer bonded explosives (PBXs) specimen surface during loading. When digital speckle correlation method (DSCM) is used to measure the deformation fields of PBXS specimen, the damage variable definition in this paper takes great advantages on damage measurement of PBXS. Using the new methods, the damage of PBX would be measured for the whole loading process and the experiment is easy to be implemented. The validity of the proposed damage variable is verified by the experimental results on column-shaped PBX specimen subject to uniaxial compression.