Simulation Study on Crack Propagation of Aero-Engine Blade

Abstract

This article simulates crack propagation problem of aero-engine blades under aerodynamic loads and centrifugal loads. Blades are critical parts in the aero-engine, fatigue fracture failure is the major failure mode for aero engine blade, one broke blade will result in serious accidents for the whole engine with great economic losses. This article finds out the location of fatigue crack source firstly according to the blade stress distribution. Then the paper calculates the stress intensity factor at crack tip for different crack length which is based on the finite element method and fracture mechanics, simulates the crack propagation path, and figures out the crack growth rate with Pairs model and FNK model .Finally this article predicts the crack propagation life.