Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 23, 2018 - November 25, 2018
Recently, the author has attempted to predict ductile fracture during tensile testing of a sheet and a bar from a microscopic viewpoint. The author's proposed model of void coalescence is based on the two-dimensional void model proposed by Thomason and the two-dimensional void model proposed by Melander and Ståhlberg, which were also derived from a microscopic viewpoint. In this study, the ellipsoidal void model, which was proposed by the author previously, is evaluated by the upset forging of a cylinder, which is one of the fundamental forging process. A number of experimental researches on the prediction of ductile fracture during the upset forging of a cylinder have been performed. However, researches on the effect of prestrain applied to a cylinder on ductile fracture have hardly been performed. Hence, in this study, the effect of prestrain, which is applied to a bar by drawing, on ductile fracture during upset forging of a cylinder, has been clarified numerically and experimentally.
