  Employing the finite element and computational fluid dynamics methods, we
have determined the conditions for the fragmentation of space bodies or
preservation of their integrity when they penetrate into the Earth's
atmosphere. The origin of forces contributing to the fragmentation of space
iron bodies during the passage through the dense layers of the planetary
atmosphere has been studied. It was shown that the irregular shape of the
surface can produce transverse aerodynamic forces capable of causing
deformation stress in the body exceeding the tensile strength threshold of
iron.
