Scalability of increase in spall threshold in the presence of cylindrical protrusions on metals surface

Abstract

The article analyzes the extent to which the previously detected effect of increase in spall threshold due to nanorelief on the surface can be scaled to large dimensions of the target, the impactor and the relief elements. Earlier, it was shown on the basis of molecular dynamics simulation that the presence of a relief can significantly increase the spall threshold due to plastic deformation in the surface layer of metal and energy dissipation of the reflected shock wave. To study the scalability of this effect on the case of macroscopic targets, and not only on nanoscale systems, an analytical estimation is constructed for decrease in the shock amplitude wave due to plastic dissipation during flattening of cylindrical protrusions on the surface. On the basis of this estimation, it is shown that an increase in the splitting threshold of the rear surface of metals with relief is scalable.