An Improved Relationship between Vickers Hardness and Yield Stress for Cold Formed Materials and its Experimental Verification

Abstract

Cold formed products are increasingly serving as high duty machine parts. Designers and users need to know their properties as accurate as possible. One such product property is the new yield stress, which can be approximated by the final flow stress of the workpiece material during forming. Vickers hardness measurements provide an easy and inexpensive method for evaluating the new local yield stress in cold formed workpieces. In this study, an improved relationship for the conversion of Vickers hardness values to yield stress is proposed. The agreement between theoretical and experimental results is better than 4% error.