Analysis of possible causes of cracks initiation on barking drum

During operation of barking drum equipment the cracks were identified on the input part of drums cylindrical shell’. On the basis of operator request the analysis of reasons of possible causes of crack initiation on drum shell has been realized. The analysis includes numerical computations of stress fields in the locations of stress concentrators resulting from loading of drum during operation as well as influence of vertical offset of drives to the stress state in drum shell. The residual stresses in selected locations of drum shell were determined by the hole-drilling method. On the basis of analysis new concept of drum shell strengthening has been proposed in order to ensure its further safe operation.