FUNDAMENTAL DEFORMATION TYPES AND SECTIONAL PROPERTIES IN ROLL FORMING

Roll forming of sheet metal is considered in terms of four fundamental types of deformation: longitudinal stretching, longitudinal bending. transverse bending and shear. Strain and work expressions are developed for each deformation type. Three of the deformation types are associated with simple sectional properties and from these it is possible to predict their relative magnitudes. It is shown that shear strain is potentially far larger than the other deformation types. Some of the implications for practical roll design are discussed.