The weight saving of automobiles by using aluminum is recently increased concerning the issue of global warming. Aluminum alloy sheets have been already applied for automobile body panels for almost two decades in Japan. The stiffness of panels made of aluminum alloy sheets, however, isn't much investigated. In this paper, the stiffness of aluminum alloy sheet panels is measured by using square panels with curvature on top of them. The yield strength of the same alloy sheets has no effect on the stiffness of the panel. The stiffness varies according to the curvature radius of the panel. The relationship between curvature radius r, deformed depth delta and load F is approximated by the following expression.F = Cr~mdelta~n (C, m, n : const, m<0) Additionally the stiffness of panels made of cold rolled steel sheets is also approximated by the same expression.
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