A new method of testing the critical stress intensity factor for stress corrosion cracking based on linear-elastic fracture mechanics theory and stress corrosion cracking theory was put forward.

Tile thickness effect on critical stress-intensity factor in plane stress is discussed, and a quantitative formula is also suggested in this paper.

Blade fracture location is match to the position of maximum stress derived from the static analysis, so try to reduce stress concentration increases the intensity of the blade is critical.