An axisym. finite element model of a single fiber composite tensile specimen having a Ti-6Al-4V matrix reinforced with one SCS6 SiC fiber was constructed. The sliding of the fiber is modelled using a const. crit. shear stress and fiber fragmentation introduced using the element removal technique. The fiber and matrix strains were computed as the fiber fractures progressively. The results are compared to synchrotron X-ray strain scanning measurements made in-situ during the test and crit. interfacial parameters are extd. Good agreement is found between numerical and exptl. results based on a crit. shear stress of 200 MPa for loading and unloading including both forward and reverse slip. [on SciFinder (R)]