The pull bar of a heavy machine suddenly failed. The owner of the equipment asked MSC to investigate the origin of the failure.
Visual inspection was performed and a replica of the fracture surface was taken for observation by scanning electronic microscope. Material of the pull bar was sampled and tested.
The fracture surface analysis showed a brittle failure initiated on an intergranular failure. Characterisation of the bulk material demonstrated that the toughness of the material was insufficient.
Detail of intergranular failure
Detail of failure initiation
Broken pull bar