This manual provides a comprehensive review of user subroutine SMA_UM (Shape Memory Alloy — Unified Model). SMA_UM is a FORTRAN coded numerical implementation of an SMA thermomechanical constitutive model. The current version of SMA_UM implements the unified constitutive model presented by Lagoudas et al. (1996), which unifies and generalizes to three dimensions the constitutive models presented by Tanaka (1986), Boyd and Lagoudas (1996) and Liang and Rogers (1992). The model is numerically implemented using return mapping algorithms. Detailed description of the implementation is provided in the research paper by Qidwai and Lagoudas (2000). The current implementation of the subroutine follows the specifications for user-material subroutines by ABAQUS and is intended primarily for use with ABAQUS. However, the subroutine can be integrated in any other standard finite element or computational program. The subroutine can be used in 3-D, 2-D plane strain and generalized plane strain, and 1-D problems.A brief outline on the functions performed by the subroutine and the input and output parameters is given in Section 2. The capabilities of the subroutine are demonstrated in Section 3, where the results for various loading cases are presented.

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