| This dissertation research investigates the response of a fiberless thirteen layer hot isostatically pressed Ti-15-3 laminate to creep, constant strain rate, and cyclic constant strain rate loading at temperatures ranging from 482{dollar}spcirc{dollar}C to 649{dollar}spcirc{dollar}C. Creep stresses from 48 to 260 MPa and strain rates of.0001 to.01 m/m/sec were used. Material parameters for three unified constitutive models (Bodner Partom, Miller, and Walker models) were determined for Ti-15-3 from the experimental data.; Each of the three models was subsequently incorporated into a rule of mixtures and evaluated for accuracy and ease of use in predicting the thermoviscoplastic response of unidirectional metal matrix composite laminates (both 0{dollar}spcirc{dollar} and 90{dollar}spcirc).{dollar} The laminates were comprised of a Ti-15-3 matrix with 29 volume percent SCS{dollar}sb6{dollar} fibers. The predicted values were compared to experimentally determined creep and constant strain rate data. It was found that the three models generally agreed with the 0{dollar}spcirc{dollar} data, but a suspected weak fiber-matrix interface caused the models to overestimate the stiffness of the laminates in the transverse direction. |
