Probabilistic structural analysis of ultra efficient engine technology ceramic matrix composite combustor liners

A probabilistic structural analysis of NASA´s ultra efficient engine technology (UEET) ceramic matrix composite (CMC) combustor liners has been completed using the NESTEM Code. The purpose was to identify the maximum stress locations and perform a probabilistic structural analysis at these locations on the inner and outer liners for given thermal loadings to determine the probability of failure at these locations. The probabilistic structural analysis included quantifying the influence of uncertainties in material stiffness properties and the coefficient of thermal expansion. Results of the analysis indicate that the circumferential component of stress was the most severe stress component and that the inner liner was more likely to fail than the outer liner. Tests of the combustor liners by general electric aerospace engines (GEAE) qualitatively support the results of this analysis.