Computer-aided ultrasonic testing and fracture mechanics evaluation of natural faults on large forged parts. Final report

The aim of the research project is the checking of computeraided mechanised ultrasonic test processes regarding their detection and resolution ability compared to the usual manual testing. Sections of typical forged parts (shafts of turbogenerators) with impermissible ultrasonic indications are used as test objects. After the end of the ultrasonic testing, large tensile samples are taken from representative fault zones. These samples are stressed similarly to stresses in operation and are then fractured by a brittle fracture in the area of the faults for micro-fractrographic evaluation. This procedure permits the true fault size to be compared with the ultrasonic findings and the fracture mechanics effect of faults to be judged. (orig./MM)