A Theoretical and Experimental Study of a Curved Strip Compressed by a Flat Plate

The quasi-static loading of a curved strip compressed by a flat, rigid plate is considered, with particular reference to large deformations and the ensuing buckling behavior. Experiments were performed on curved strips of constant width but of different thickness. The strips were initially deformed to a fixed radius of curvature and stress relieved before pinning the ends. The span was held constant at about 305 mm. The deformation characteristics have been analyzed using an incremental finite element technique. Particular attention has been paid to modeling the situation when a node contacts the plate and the condition for separation of the strip from the plate. The predicted loads and deformation modes agreed well with experimental results from tests on steel and aluminum specimens. The experimental and theoretical procedures are pertinent to the study of dent resistance of sheet metal stampings, particularly automotive panels.