Analysis of Asymmetrical Rolling of Unbonded Clad Sheet by Slab Method Considering Vertical Shear Stress

A novel analytical approach for asymmetrical rolling of two unbonded clad sheet layers is creatively proposed to calculate the rolling force and torque. In this new approach, the vertical stresses which make calculation results be agree better with results measured in experiments are first applied in clad sheet asymmetrical rolling process. During varying of different roll speeds, roll radii and yield stress ratio of the two materials as well as different friction coefficients, two neutral points and one bonding point are obtained, then the plastic deformation region is divided into four zones. The neutral points, the bonding point, distribution of the rolling stress, the horizontal stress of the whole clad sheet and clad thickness ratio at the exit can be calculated by the present solution easily and rapidly. In order to verify the accurateness of the new model, the results received have been compared with those calculated by other traditional models as well as measured in the experiments conducted by previous scholars where the effects of vertical shear stress were ignored. As it can be seen, the maximum of errors is less than 9.8%.