The interfacial properties of a glass-ceramic matrix composite (SiC/CAS) were determined from single-fibre push-out tests using the interfacial test system. The coefficient of friction, I~, the residual clamping stress, ~c, and fibre axial residual stress, ~z, were extracted by fitting the experimental stress versus fibre-end displacement curves using the models of Hsueh, and Kerans and Parthasarathy. Using Hsueh's model, the intrinsic interfacial frictional stress (~ = #~c) was found to be 11.1 ___ 3.2 MPa, whereas by using Kerans-Parthasarathy's model it was found to be 8.2 _+ 1.5 MPa. Comparisons between these models are included, together with a discussion of data analysis techniques.
Nomenclature
~ Axial fibre residual stress (Pa) cy* Effective clamping stress (Pa) cy~ Residual clamping stress (Pa) c~p Poisson's effect-induced clamping stress (Pa) cy] Debond stress in the absence of residual stresses (Pa) ~d Experimental debond stress (Pa) cy Compressive applied stress (Pa) Interfacial shear stress (Pa) u Fibre-end displacement (m) h Debond length (m) r Fibre radius (m) Ef Fibre Young's modulus (Pa) Em Matrix Young's modulus (Pa) vf Fibre Poisson's ratio (dimensionless) v~ Matrix Poisson's ratio (dimensionless) f Fibre volume fraction (dimensionless) k Parameter (dimensionless) D Parameter (dimensionless) Interracial coefficient of friction (dimensionless) Gi Interface toughness (J m-2) Ca Load-train compliance (m N-1)