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Mass optimisation of turbofan engine casing madeof sandwich structure

Szymczyk Elżbieta, Jachimowicz Jerzy, Puchała Krzysztof, Szymczyk Wiesław

Computer Assisted Methods in Engineering and Science

2018

Vol. 25, no. 2-3

81--88

Materials of a high specific strength and stiffness are used in the aerospace industry to obtain the lowestpossible aircraft mass. The object of analysis is the casing of the F124 turbofan engine. The axiallycompressed cylindrical part of this casing is considered. The aim of the paper is to analyse possiblebenefits of replacing the original ribbed metal casing with a sandwich structure. The sandwich structure(metal-fibre laminate) of titanium alloy faces and a flax fibre laminate core is proposed. Semi-analyticaloptimisation of a sandwich structure was performed including a polynomial approximation of the criticalload with correction obtained based on numerical analysis. The best mass efficiency was obtained fora core to faces thickness ratio equal to about 4.