The fractography gives information about the kind of fracture. This way we can determine if the material has had an incipient crack prior to operations that enlarged or if the crack originated during the operation itself. Moreover we can determine if the crack is based on a fatigue fracture or forced fracture.
for steel according to DIN EN 25817 or AD-MB HP 5/3
for aluminium according to DIN EN 30042 or AD-MB HP/5/3