Spring back and Bending Forces
- Spring back is the elastic recovery following plastic deformation during bending
Bendability and Minimum Bend Radius
A3T minimum bend radius means the smallest radius the sheet can be bent to without cracking is 3 times thickness
·r is the tensile reduction of area of the sheet metal
(a)and (b) The effect of elongated inclusions (stringers) on cracking. as a function of the direction of bending with respect to the original rolling direction of the sheet.
(b)Cracks on the outer surface of an aluminum strip bent to an angle of 90. Note the narrowing of the top surface due to the Poisson effect.