Creep transients after stress changes

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Abstract
Simple equations which describe the rates of creation and annihilation of dislocations are used to predict the creep transients which follow a stress change. Behaviour can be understood most easily with reference to the functional dependence of creep rate upon dislocation network spacing. The creep rate is zero below a critical value of spacing and the function shows a maximum at some higher value of spacing. It is shown that the types of transient response depend critically on the position of the steady state creep rate with respect to the position of this maximum. Materials are considered to be divided into two categories depending on the relative mobilities of glide and climb. The wide variety of transient types that exist can all be shown to follow as a natural consequence of these considerations. MST/996