Shells, folds, tents

Abstract

Shells come in single and double curvature. The first include shells that have a cylindrical or conical surface. Shells of double curvature can be either shells of rotation with a curvilinear generatrix (dome, hyperbolic paraboloid, ellipsoid of revolution, torus surface, etc.), or shells of transfer with constant curvature in vertical planes along all successively located sections. Shells can also be created by combinations of various curved intersecting or mating surfaces.