Abstract
2.5D C/SiC ceramic matrix composite is widely used for thermal protection and hot sections of gas turbine engines. The fibre axis in these components plays a big role in its performance, under multi-axial strain conditions. In the present investigation, the effect of fibre orientations has been studied. Three-point bend specimens of this composite with 30°/− 60°, 45°/− 45° and 0°/90° fibre orientations have been prepared and tested under bending loads. Various mechanical parameters such as flexural strength and Young’s modulus have been evaluated. A considerable reduction in the flexural strength and Young’s modulus has been observed in this composite with 30°/− 60° and 45°/− 45° fibre off-axis orientations. In situ damage assessment has been conducted with the help of the acoustic emission technique. Various micro-mechanics parameters such as the matrix cracking stress, matrix cracking saturation stress and stress for fibre fracture initiation have been derived using acoustic emission data as a function of the off-axis orientation of the fibres.
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