Published: Jan 1985
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Measurements of steady state creep rates and activation parameters are described for rock salt at low temperature (T ≤ 0.4Tm; where Tm is melting temperature) and low strain rates. The determinations of steady state creep rates rely on the evaluation of upper and lower bounds associated with characteristic transients after changes in stress and temperature. First order activation analyses make use of correlations between the steady state creep rates, stress, and temperature. More rigorous activation analyses result from comparisons of creep rates right before and after temperature and stress changes. Selected experimental results are given for rock salts from two locales deformed between 40 and 160°C. Based on measured values of activation enthalpies, activation areas, correlations between steady state creep rates by means of a power law, and some temperature-induced transients, it is suggested that the low-temperature creep of rock salt is affected by large, independent contributions from glide mechanisms besides dislocation climb.
rocks, creep, temperature, rock salt, low temperature creep, steady state creep rates, activation parameters, creep mechanisms
Distinguished member of technical staff, Sandia National Laboratories, Albuquerque, NM