Deformation of aluminum-fin tubes in uniform bending has been experimentally studied and compared with that of tubes without fin. When the plane of the fin is perpendicular to the bending plane, both the bending moment and the flattening of cross-section are identical with those in tubes without fin. But when the plane of the fin coincides with the bending plane, the bending moment and the flattening of cross-section become larger than those in ordinary tubes and wrinkles can be seen on the inner side fin. These effects of slittless fin on the deformation in bending are quantitatively clarified.Keywords: aluminum-fin-tube, slittless-fin, plastic bending, flattening of cross-section, bending moment.
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