Abstract
This paper deals with some problems concerning the utilization of flow stress data in metal forming calculations. Special attention is paid to the softening phenomenon in cold forming due to strain recovery caused by the change of deformation mode. New and earlier - not yet published - observations are presented about strain softening in some cold forming processes. These results bear out the assumptions made earlier by Kudo as reported by Thomsen [1], namely that altered direction of deformation yields differences in flow stress and in strength of cold formed parts. Stress-strain curves obtained by deformation in a single direction - as in tensile, compression and torsion tests - are not necessarily suitable and reliable information about material behaviour in forming processes when altered or reversed strain increments are employed in the forming processing as in draw-rolling, swaging, roller levelling etc.
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