Spheroid graphite cast iron spacimens with defects cracking investigation

The results of experimental and analytical study of cracking threshold for cast iron with defects have been presented. The mechanical properties indices (σu ≈ 950MPa) and microstructure of spheroid graphite iron have been estimated. CT specimens from cast iron with defects and cast iron without defects have been tested. Dependencies between crack growth rate and threshold for specimens with shrinkage voids and without them have been obtained. Threshold values are obtained when the crack growth rate is v=10-10 m/cycle, v=10-11 m/cycle and v=10-12 m/cycle