STP765

    Deformation Modeling in Sodium Chloride at Intermediate and Elevated Temperatures

    Published: Jan 1982


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    Abstract

    The flow stress dependence on temperature and strain rate of annealed, isotropic polycrystalline NaCl has been determined at temperatures of 296 to 673 K (0.28 to 0.63 TM) and strain rates of 10−1 to 10−8 s−1.

    At elevated temperatures (T > ∼ 0.44 TM) and relatively low stress the Na+ diffusion-controlled climb of dislocations was found to be the rate-controlling deformation mechanism, and the experimental data could be fitted by a power-law function. In the same range of temperatures, at high stresses the deformation process was controlled by dislocation climb creep due to Cl ion diffusion. At intermediate temperatures and low strain rates and at elevated temperatures and high strain rates the deformation was rate-controlled by the lattice resistance to the dislocation glide motion (Peierls mechanism).

    The constitutive equations for each deformation mechanism as well as that for the transition from one deformation mechanism to another were developed in terms of strain rate, temperature, and stress. The implications of the transition from one deformation mechanism to another over a wide range of temperatures on the deformation modeling for this material are discussed. The application of such analysis to understand and predict the rheological behavior of halite aggregates in nature in buried salt deposits is considered.

    Keywords:

    NaCl, stress-strain rate-temperature, deformation modeling, creep mechanism, rheological prediction in salt structure, deformation mechanism diagram


    Author Information:

    Arieli, A
    University of California, Davis, Calif.

    Heard, HC
    Lawrence Livermore Laboratory, University of California, Livermore, Calif.

    Mukherjee, AK
    University of California, Davis, Calif.


    Paper ID: STP28896S

    Committee/Subcommittee: E28.10

    DOI: 10.1520/STP28896S


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