Rissverhalten bei dynamischer Beanspruchung. T. 2 Untersuchungen an Kleinproben

Under quasistatic loading conditions methods for safety analyses are widely verified. The aim of these investigations was the development of a methodology for safety analyses of dynamically loaded cracked power plant components. The impact of the loading rate on strength and deformation behaviour at strain rates of 10"-"4s"-"1 up to 10"4 s"-"1, on crack initiation and crack resistance at loading rates of up to #KAPPA#= 10"6 MPa#sq root#(m/s) resp. j= 5 x 10"6 N/mms was investigated within the scope on the transferability of results obtained from small-scale specimens to components. Material models including a strain rate function for eight steels covering a wide range of toughness and ductile cast iron were established. Experiments with longitudinal pipe strip specimens, austentic wide plates and ferritic pipe sections were simulated by finite element calculations and analysed by means of numerical results and different engineering approaches. A method for safety analyses which considers constraint and dynamic material behaviour could be verified. (orig.)SIGLEAvailable from TIB Hannover: F95B888+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman