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The creep behaviour of a 2D woven alumina fibre-reinforced silicon carbide matrix composite has recently been the object of several experimental and modelling studies, which focused mainly on the description of the primary and secondary stages. In the primary stage, a stress redistribution between matrix and longitudinal fibres takes place, which is influenced by matrix microcracking. At the end of this transient stage, an extended tertiary stage develops until composite failure occurs. The secondary stage is thus reduced to an inflexion point in the creep curve. In this study, the tertiary stage is associated with a progressive fibre-matrix debonding induced by a difference in the radial strains of the constituents. This damage mechanism can account for the decrease of the longitudinal elastic modulus during tertiary creep, for the presence of large cracks in the matrix and for the large amount of fibre pull-out observed on the fracture surface after creep failure.

Additional information

Authors: LAMOUROUX F, JRC Petten (NL);STEEN M, JRC Petten (NL);VALLÉS J L, JRC Petten (NL)
Bibliographic Reference: Paper presented: First International Conference on Composites Engineering, New Orleans (US), August 28-31, 1994
Availability: Available from (1) as Paper EN 38644
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