The analysis of thermal activation under shear stress in three- and even two-dimensional models presents unresolved problems. The analysis of one-dimensional models presented here may illuminate the study of more realistic models. For the model in which as many dislocations are poised for backward jumps as for forward jumps, the experimental activation volume V-dagger(sigma(a)) under applied stresses close to sigma(a) is different from the true activation volume V(sigma) evaluated at sigma = sigma(a). The relations between the two are developed. A model is then discussed in which fewer dislocations are available for backward than for forward jumps. Finally, the appropriateness of the hyperbolic sine approximation for moderately low stresses is defined and shown to be very limited.
Reference:
Nabarro, FRN. 2003. One-dimensional models of thermal activation under shear stress. Philosophical Magazine, vol. 83(26), pp 3047-3054
Nabarro, F. (2003). One-dimensional models of thermal activation under shear stress. http://hdl.handle.net/10204/2056
Nabarro, FRN "One-dimensional models of thermal activation under shear stress." (2003) http://hdl.handle.net/10204/2056
Nabarro F. One-dimensional models of thermal activation under shear stress. 2003; http://hdl.handle.net/10204/2056.
