Modeling The Effects Of Texture On Thermal Expansion In Pressed Pbx 9502 Components

This paper demonstrates the effects of texture induced during pressing of PBX 9502 charges. We quantify the spatially variable anisotropic thermal strains associated with preferred orientation of TATB crystallographic (002) poles within manufactured components. The modeling approach is based on a series of three models. First, a component-level finite element model of the charge during consolidation from powder into pressed explosives is used to predict the deformation associated with this process. The deformation predicted from these simulations is used with a texture evolution model to estimate orientation distributions for TATB crystals at every integration point within the HE charge. The orientation distributions estimated using the texture evolution model are used within a self-consistent homogenization scheme to predict the spatially-variable macroscopic or aggregate thermal strain as a function of temperature at every location within the pressed component. Results are compared with measurements of texture and anisotropic thermal expansion for. several locations sampled from pressed explosive components.