Abstract
There was a breaking accident of a solid grooved roll having closed passes, which seemed to be broken at a groove bottom mainly by mechanical stresses.
The stresses were analyzed by a three-dimensional photoelastic method and the cause of the breakage was studied. The effect of groove shapes on the stress distribution of the grooved roll was investigated by a two-dimensional photoelastic method. The main results obtained are as follows :
1) As a result of the stress analysis of the solid grooved roll having closed passes, it became clear that the breakage was caused by too large mechanical working stresses.
2) To prevent the breaking accident of the grooved roll at a groove fillet, it is most effective to make the diameter of the groove and collar as large as possible.
