Reflection of plane waves from the stress-free boundary of a nonlocal elastic solid half-space containing double porosity

Abstract Reflection phenomena of a set coupled longitudinal waves/shear wave striking obliquely against the mechanically stress-free boundary surface uniform nonlocal elastic solid half-space with double porosity structure have been investigated. Employing appropriate conditions at surface, formulae for reflection coefficients and their corresponding energy ratios derived dissipative non-dissipative models. Their variations computed angle incidence specific model. It is found that all depend upon presence nonlocality, porosities both types, frequency incidence. impact on various also studied numerically depicted graphically.