6. The method of claim 1 , wherein the residual life indicator includes at least one of a crack growth rate, a cycle count assessment, and a crack size versus cycle count assessment.
1. A method comprising: receiving, at a processing system, at least one vibration response parameter associated with an airfoil, wherein the at least one vibration response parameter comprises at least one of an airfoil excitation frequency, an airfoil vibration amplitude, and an airfoil structural damping; using the processing system for: computing a modal stress intensity factor (SIF) of at least one cracked airfoil finite element model using fracture mechanics based finite element analysis; and computing a vibratory SIF based, at least in part, on the modal SIF and a scaling factor comprising a variable number based on the at least one vibration response parameter; and computing a residual life indicator of the airfoil based, at least in part, on the vibratory SIF.