Stochastic Corrosion Fatigue Model for Front Flanges of Fleet Aero Engines- Airworthiness Purpose by Automated Data Analysis Method

Corrosion in combination to fatigue cycling loading is inevitable and becomes a challenging problem even though selection of inherently corrosion protected materials has been applied based on established in house experience. Aero engine mount structures are exposed to dust and salt environmental conditions both during operational and non-operational periods. Predictions of remaining useful corrosion fatigue life are becoming tough due to the materials strength degradation5 from the service condition and hence rationalized approach is being currently used to assess their structural integrity. This paper brings a novel approach to predict the corrosion fatigue by proposing random parameter model in combination to experimental data. The two random parameter model with probability method is employed here to determine the time-independent corrosion fatigue life of magnesium structural casting used heavily in mount structures. The same is also correlated with experiments data from literature for validating the proposed stochastic corrosion fatigue model to address the technical variance occurred during in service.