Instability of an interface between steel layers acted upon by an oblique shock wave

Numerical modeling of experimental results was performed by a two-dimensional Lagrangian procedure using an elastoplastic model with a functional dependence of the dynamic yield point on the state variables of the material. The calculations showed that perturbations develop only in the presence of a technological microgap of several tens of micrometers between the metal layers. Unloading of the material behind the oblique shock front into the gap gives rise to a considerable short-term velocity gradient. Simultaneously, near the interface behind the wave front there is a short-term loss of strength of the material due to thermal softening and the heterogeneous nature of the deformation.