The Elastic Strain Ratio, the Lüders Strain Ratio and theEvolution of r-Value During Tensile Deformation
1992
The elastic counterpart of the plastic strain ratio is derived from ultrasonic data measured on twenty
commercial deep drawing steels. It is shown that the observed variations in plastic r are related to the
evolution of texture, and are not affected either by the elastic range of deformation or by the
propagation of Luders bands. Further quantitative analysis suggests that the elastic strain ratio,
determined non-destructively, can be used to predict plastic r-values by means of an empirical
relationship.
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