Instrumentierter Kerbschlagbiegeversuch. Ergebnisse eines Ringtests zur Kerbform

The German DVM-group on "Instrumented Impact Testing" has recently finished a round-robin test. Seventeen participants performed about 400 instrumented Charpy tests with a German reactor pressure vessel steel at four different temperatures. The specimens were prepared with standardized V-notches, spark-eroded crack-similar slits or fatigued cracks. Besides standardized material data, like e.g. the Charpy energy, especially characteristic forces and partial energies were determined and thereon based evaluations of fracture mechanical quantities were performed. The results of the participants showed an excellent agreement. A high accuracy of the force measurement was observed. Therefore, these results support current international activities to standardize the instrumented Charpy test.