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The high temperature creep and fatigue behaviour of continuous fibre reinforced ceramic matrix composites (CFCCs) is presented. CFCCs have been studied under high vacuum conditions to avoid environmental interferences on the mechanical response. The mechanical loads imposed result in matrix cracking upon first loading, so that continued static or cyclic loading results in progressive interfacial debonding and/or matrix crack multiplication, as well as fibre failure.
Both creep and fatigue loading give rise to progressive debonding along the fibre-matrix interface. This results in an increase of the stress borne by the fibres in the debonded part. This increase critically depends on the magnitude of the mismatch between the intrinsic creep rate of the fibres and of the matrix, which governs the amount of stress redistribution from the elastic distribution between the two constituents. Under pulsating fatigue (tension-tension) at high temperature the material response is affected by both creep and fatigue mechanisms. The cyclic damage component gains in relative importance with increasing test frequency. Under reversed loading conditions (tension-compression), and depending on the creep strength mismatch between the fibres and the matrix, the time-dependent damage component can be largely suppressed, and the composite fatigue behaviour can become close to purely cycle dependent. In both cases fatigue failure is triggered by fibre failure.

Additional information

Authors: STEEN M, JRC Petten (NL)
Bibliographic Reference: Paper presented: 1st Hellenic Conference on Composite Materials and Structures, Xanthi (GR)
Availability: Available from (1) as Paper EN 40808 ORA
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