Thermal-mechanical fatigue behaviour of a titanium matrix composite reinforced with long SiC fibers

International audienceThis study investigates the thermal-mechanical fatigue (TMF) behaviour of a titaniummatrix composite, SCS6/Ti-6242 aimed to be used in future jet engines by Snecma. TheTMF tests conditions under stress control are chosen to simulate the actual loading ofthe composite part in a compressor disc during engine operation. Observations offracture surfaces are consistent with a failure controlled by fibre fracture and matrixmicro-cracks. A finite element model is made to estimate the stress in the variouscomponents based on the Transformation Analysis Model of Dvorak. A complexredistribution occurs under thermal mechanical cycle due to viscoplasticity of Ti-6242matrix. This is a major input for damage models to predict lifetime under these complexloading conditions