Abstract
The J-Integral method is of great importance for the experimental determination of specific material properties. Therefore methods for detection of crack-initiation and also of the J c-value of fatigue precracked Charpy-type specimens under quasistatic and dynamic loading are presented. The dynamic tests were executed on a modified impact testing, machine, instrumented by TVFA of TU Vienna. The crack initiation was determined from the force-deflection diagram. Additionally the electric potential was recorded without isolation and electric current supply. The proof was effected by heat-tinting and scanning electron micrographs.
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