The Jump Bend

An elastic flat rotation shell under action of compression forces takes the form of a circular plate. The problem about stress-strain condition of the circular plate is solved. A conic shell with rectilinear generatrices changes into a cone of opposite direction by jump under action of the compression forces. This is named a jump bend. The problem about minimal force to create the jump bend is solved. An elastic flat pyramidal shell under action of compression forces takes the form of a polygonal plate. The problem about stress-strain condition of the polygonal plate is solved. A flat pyramidal shell changes into a pyramidal shell of opposite direction by jump under action of the compression forces. The problem about minimal force to create the jump bend is solved. An elastic spatial flat design in the form of a rod cone under action of compressing forces is transformed to a plane. The problem about stress-strain condition of the spatial design is solved. A rod cone changes into a rod cone of opposite direction by jump under action of the compression forces. The problem about minimal force to create the jump bend is solved.