The Distribution of Strains in the Rolling Process

A series of experiments are described in which the complete strain distributions are given for copper bars rolled with a varying number of passes in different directions at a reduction of 20 per cent per pass. The effects of different rolling sequences on the strain patterns are described. Numerical values are reported, showing that alternate passes in different directions produce much less distorted networks, as compared to the cases of rolling in the same direction for each pass. The presence of tensile elastic strains ahead of the rolls was demonstrated by the use of a brittle lacquer, and comparisons were drawn between these and the elastic strains produced in lateral compression tests between rollers of the same diameter.