Constitutive equationsThe XF explosive family from NEXTER Munitions relies on a melt cast formulation with a TNT matrix. Melt cast formulations provide a high-volume ratio of energetic filler material to matrix. This might affect the mechanical response of the material and its damage process. Therefore, a laboratory study has been launched to improve the knowledge of the mechanical behavior of this family of energetic materials. To mimic the conditions observed by the material inside ammunition, we chose to adapt a passive confinement method to the pyrotechnic conditions of the XF-11585. This relies on an elastic-perfectly plastic ring that gives us access to the shear behavior for different loadings in quasi-static regime. This setup allowed us to investigate the physical phenomena involved under both pressure and shear. Then, based on the results obtained, we built an isotropic elastic damage model. This macroscopic modeling of damage is meant to be simple but complex enough to provide an assessment of the material degradation.