After the fracture, the compressor rotor was separated into four different parts, leading to a brittle
fracture. On the examination of fractured parts, it can be concluded that all fractures started at a corner
radius due probably to high stress concentrations. The thickness between the hub hole and the canals also
has an important effect on fracture behaviour. Examination of the rotor material revealed that the cast
iron contained excessive carbon and had a low impact energy