Fatigue crack growth analysis of a gas turbine engine fan disk

In this thesis, the fatigue crack growth analysis of a gas turbine enginefan disk is performed using computer programs. Titanium alloy is considered tobe used as the material of the disk. Model geometry is prepared in Unigraphicscomputer aided design (CAD) program. At first, the model is imported toANSYS finite element analysis code and the linear structural stress analysis isperformed. Afterwards, CAD model is imported to FRANC3D program andstructural analysis of disk is repeated with boundary element solution.According to results of these analyses, in FRANC3D program a 3D crack isadded to disk structure. By propagating this crack under current loading cyclesand boundary conditions; the effects of crack in the structure and material isinvestigated. The results of structural and fractural analysis are presented bycrack propagation graphics, stress and displacement distributions. Crackpropagation and life estimation calculations are also presented in this thesis.Keywords: Structural Crack Propagation, Fracture Mechanics, StructuralAnalysis, Fatigue, Gas Turbine Engine Fan Disk