Investigations by non-destructive inspection to determine the size of natural defects in large forgings of turbogenerators

New brittle fracture model for the European pressure vessel standard

“…This is a reasonable assumption for thicker gauges since such large cracks should easily be detected during non-destructive testing. This has for example been verified by Mayer et al for turbine rotors [12][13][14]. They found that cracks down to 14 mm in size could be detected and characterised in these large components.…”

“…[12][13][14]16] demonstrate that cracks with a depth of 25% of the wall thickness are readily detected at larger gauges. This has also been shown by Mani et al [18] who measured the detectability and size of cracks generated during manual metal arc welding and submerged arc welding.…”