Abstract
An improved method for the flow-function analysis of visioplasticty data is presented in which the use of techniques for the smoothing of raw data is reduced. It is shown theoretically, and experimentally verified, that under the assumptions of flow-function analysis the final axial, radial, and circumferential normal strains in the extruded material are fixed solely by the reduction ratio. Velocity fields computed from analysis of axial grid-line data are shown to predict accurately the experimental positions of corresponding transverse grid lines. From the velocity fields strain rates are computed. Transformation equations are developed relating the deformation in the spatial co-ordinate system to a more easily interpreted material co-ordinate system. By use of these equations excellent agreement is obtained with experimental normal strains by integrating the calculated strain rates through the deformation zone. Very good agreement is also obtained with the final angles between axial and transverse grid lines.
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