Thermal-mechanical fatigue behaviour of a titanium matrix composite reinforced with long SiC fibers
Résumé
This study investigates the thermal-mechanical fatigue (TMF) behaviour of a titanium
matrix composite, SCS6/Ti-6242 aimed to be used in future jet engines by Snecma. The
TMF tests conditions under stress control are chosen to simulate the actual loading of
the composite part in a compressor disc during engine operation. Observations of
fracture surfaces are consistent with a failure controlled by fibre fracture and matrix
micro-cracks. A finite element model is made to estimate the stress in the various
components based on the Transformation Analysis Model of Dvorak. A complex
redistribution occurs under thermal mechanical cycle due to viscoplasticity of Ti-6242
matrix. This is a major input for damage models to predict lifetime under these complex
loading conditions.
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