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Viscoelastic-Viscoplastic Strength Model for PBX

We present a material (strength) model for describing the deformation of PBX under quasistatic mechanical and thermal loadings. It is a viscoelastic-viscoplastic model incorporating the effects of pressure and temperature on the strength of PBX. The model is calibrated using uniaxial tension and compression tests. Using FEM simulations in Ls-Dyna, we validated the model with creep and relaxation tests. To further validate the model, we performed an experiment with thermally loaded, biaxially strained, sample and measured its deformation using Digital Image Correlation method.