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.
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