Creep properties identification of PBX using digital image correlation

The creep behavior of the polymer bonded explosive (PBX) substitute material is investigated by using the digital image correlation (DIC) method. At first step the 3-points bending test is applied to achieve the tested PBX substitute material's elastic parameters, which are identified by the calculated heterogeneous strain fields and the so-called virtual fields method (VFM). In the second step, the creep property of PBX material is studied by the Brazilian disc compression test. The stress fields could then be reconstructed with the identified elastic parameters and the strain fields at the first step of loading. The time hardening coefficients which present the creep behavior could be extracted by the time-depending strain rate curves of the points on the surface.