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Evaluation of Strength and Measurement of Working Strain on Press Forming of Steel Sheet
Published May 23, 2012 by Society of Automotive Engineers of Japan in Japan
In this research, to clarify influences of work-hardening on hardness, tensile stress and fatigue strength of press-worked products, we measured surface strain and thickness of mild steel products which were made on three-stage forming. Results of this study indicate the following: (1) Hardness, tensile stress and fatigue strength of press-worked products increased in incremental steps of forming process due to the work-hardening effect. (2) Work-hardening behavior in the press-worked products could be evaluated by the amount of the total strain which was sum up the amounts of the surface strain and the strain in the through-thickness direction. The amount of total strain was proportionate to the increased hardness and tensile stress of work-hardened products.