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An experimental program has been initiated to measure the response of Timetal
®21S plates and SCS-6/Timetal
®21S metal matrix composite (MMC) plates monotonically loaded through a pinned connection at high temperature. A coordinated analytical effort has also been started to model these experiments using the ADINA finite element package and a modified version of the user-defined material module of Kroupa (1993) which incorporates a Bodner-Partom viscoplastic model. Results are presented for the first part of this analytical study, which considered the response of monolithic Timetal
®21S plates in order to determine the importance of various factors for incorporation into more complex analysis of the MMC plates. Studies were conducted to assess the viability of efficient approximate boundary conditions; the importance of residual thermal stresses induced during heat up prior to mechanical loading; and the accuracy of the material model. Results indicate that detailed modeling of the pin-plate contact surface is required to achieve high accuracy; thermal residual fields in the plate and pin may be neglected; and refinement of the constitutive model is required for improved accuracy.