Mixed-Mode3D Crack Analysis of Gas Turbine Blade

In this paper 3D mixed-mode crack analysis of gas turbine blade is performedby using the finite element method and the path independent J integral.The effect of different parameters like rotation speed ofthe blade, fluid pressure, crack angle, crack position on the blade and crack length on the stress intensity factors of mode I, II, III and effective are investigated.Moreover critical rotational speed and critical crack length, height and angle are estimated too.Results are alsoshow, the edge cracks might grow form surface crack tip, so Surveillance of crack outer surface assurance the safety in the blade.