Method of dynamic fracture toughness determination of cast steel on the base of the Charpy impact energy test

Investigations of dynamic toughness and Charpy impact energy have been made for cast steel in the temperature interval from 20^ circ C to 60^ circ C. The experimental relationships between the critical value of J integral under dynamic loading conditions and the Charpy impact energy for different notch geometries and impact velocities have been determined. Mathematical relations between the measured values have been used to estimate the dynamic toughness of cast steel.