In the present study, the three-dimensional elastic discrete element method (DEM) and the elastic finite element method (FEM) analysis were, respectively, applied to the randomly distributed identical spheres as a granular target and to the cylindrical projectiles in order to clarify dynamic response during penetration. In the target, it was found that highly densified region was formed just ah...

Computing the backscattering of harmonic acoustic waves from underwater elastic targets arbitrary shapes is a challenging problem considerable practical significance. The finite element method well suited for discretization target, while boundary addresses radiation condition at infinity. A disadvantage integral that it yields non-unique solutions certain wavenumbers. This failure associated wi...