Identification of the mechanical behaviour and damage mechanisms of a Nextel™610/alumina ceramic matrix composite subjected to tensile loading
Résumé
(x ± y % = 4 words → counted as 1 , z % = 2 words → counted as 1 → total: < 150 words) The present study was aimed at determining the mechanical behaviour of a weak matrix oxide/oxide CMC subjected to monotonic and cyclic tensile loading in fibre direction and in ±45° fibre orientation and at identifying the damage mechanisms. The material consisted of Nextel™610 fibres (8 HSW) embedded in an alumina matrix, with a fibre volume fraction of 49 % and 24 ± 2 % porosity. The average ultimate tensile stress and strain of the material were, respectively, 260 ± 37 MPa and 0.3 ± 0.09 % in fibre direction and 89 ± 19 MPa and 0.19 ± 0.07 % in ±45° fibre orientation. Interlaminar shear strength, evaluated through 3-point bending tests, was 20 ± 2 MPa. Various techniques were used for microstructural characterization of as-processed material. Two types of pores were differentiated within the material: micropores (13 ± 1 %) and macropores (12 ± 1 %). The latter appear to be the most 2 detrimental for the material, enhancing delamination. The damage mechanisms of the material were assessed through SEM examination and in situ tensile tests.
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