On the Relation between R-Value of a Grain and the Operating Slip Systems of the Grain
The r-value is defined as the ratio of the width strain to the thickness strain under uniaxial tensile loading. The r-value can be defined for each grain in polycrystalline metal during plastic deformation. It was pointed out that r-value of a grain affects the surface roughening of polycrystalline metal, and hence also affects the formability of thin sheet metal. On the other hand, it was shown that by using a rate-type constitutive relation for crystal slips the effect of the number of active slip systems on the yield curves is clarified. In the present paper, the relation between r-value of a grain and its operating slip systems in polycrystalline metals is studied.
Yeong-Maw Hwang and Cho-Pei Jiang
T. Abe, "On the Relation between R-Value of a Grain and the Operating Slip Systems of the Grain", Key Engineering Materials, Vol. 626, pp. 566-569, 2015