Abstract

Self-consistent relations have been traditionally formulated with a uniform matrix. To represent the additional effect of plastic heterogeneity actually taking place in a polycrystal, a non-uniform distribution of body force is introduced into the matrix to calculate the inclusion-matrix interaction. This consideration allows us to extend the traditional relations to a new form which, when correlated with the characteristic length or grain size of the polycrystal, is capable of describing the grain- and/or specimen-size dependency. A geometrical interpretation on the implication of plastic constraint factor is offered; following this, the newly established self-consistent relation is seen to suggest that among others, a larger specimen will have a harder plastic response. Such a prediction, as illustrated in an application, was confirmed with experimental observations on the behavior of a low carbon steel.

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