Deformation in uniform bending of aluminium-fin-tube with slit is experimentally studied. Aluminum-fin-tubes with pararell type slit and cross type slit with different slit distances are bent in such a situation that the plane of the fin coincides with the bending plane. Following conclusions are obtained. 1) There exists a slit distance
Leim under which value, the fin does not affect the deformation of the tube in bending. 2) The deformation of the fin-tube in bending concentrates at the slit bottom except the case when slit distance is lower than
Leim In this case, the bending deformation is uniform along the tube axis direction. 3) Twisted fin has no effects on the bending deformation of the fin-tube when slit distance is lower than
Leim. 4) If there exist some uncutted width
f* between the slit bottom of the fin and the tube, the bending deformation of the fin-tube is nearly the same of the fin-tube which has the slitless fin of the fin width
f=
f*.
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