Badania prędkości pękania i kształtu pęknięcia w stali o podwyższonej wytrzymałości przy zmiennym zginaniu

The crack growth rate and crack tip shapes in high-strength steel specimen (0,2%C, l,5%Mn, 0,03Nb) with semi-elliptical surface crack and with central holes under bending has been investigated. It is lower that under cyclic tension. The fatigue crack growth rate obtained by measurements made on the specimens surfaces is compared with the crack growth rate calculated from the striation spacing.