ON DETERMINING TEMPERATURE-DEPENDENT INTERFACIAL SHEAR PROPERTIES AND BULK RESIDUAL-STRESSES IN FIBROUS COMPOSITES

The model of the preceding paper is applied to the analysis of interfacial sliding during thermal cycling in three titanium or titanium aluminide alloys reinforced by SiC fibers. The model is found to give an excellent account of the experimental measurements. By fitting the model to the data, values are obtained in all cases for the critical interfacial shear stress, tau-0, at room temperature. In two cases, values are also obtained for the bulk, axial residual stresses at room temperature, and the average of d-tau-0/dT over the interval of temperature T between room temperature and the maximum temperature attained in the thermal cycling. The residual stresses are in good agreement with other measurements. In the third case, the residual stresses cannot be determined; but, if values for them are taken from other experiments, then the same average of d-tau-0/dT can be determined. The values of t0 and the implied coefficient of friction are consistent in all cases with frictional sliding in graphitic layers in the carbon rich coatings on the SiC fibers.