  Atomistic and continuum scale modeling efforts have shown that shock induced
collapse of porosity can occur via a wide range of mechanisms dependent on pore
morphology, shockwave pressure, and material properties. The mechanisms that
occur under weaker shocks tend to be more efficient at localizing thermal
energy, but do not result in high, absolute temperatures or spatially large
localizations compared to mechanisms found under strong shock conditions.
However, the energetic material TATB undergoes a wide range of collapse
mechanisms that are not typical of similar materials, leaving the collapse
mechanisms and the resultant energy localization from collapse, i.e., hotspots,
relatively uncharacterized. Therefore, we present pore collapse simulations of
cylindrical pores in TATB for a wide range of pore sizes and shock strengths
that trigger viscoplastic collapses that occur almost entirely perpendicular to
the shock direction for weak shocks and hydrodynamic-like collapses for strong
shocks that do not break the strong hydrogen bonds of the TATB basal planes.
The resulting hotspot temperature fields from these mechanisms follow trends
that differ considerably from other energetic materials; hence we compare them
under normalized temperature values to assess the relative efficiency of each
mechanism to localize energy. The local intra-molecular strain energy of the
hotspots is also assessed to better understand the physical mechanisms behind
the phenomena that leads to a latent potential energy.
