The Effect of Torsional Prestrain on the Tensile and Low-Cycle Fatigue Properties of Mild Steel

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概要

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• The effect of torsional prestrain on tensile and low-cycle fatigue properties of a medium carbon steel was studied. A series of small-sized tensile and fatigue specimens were prepared from large-sized prestrained specimens in order to ensure good homogeneity of the torsional prestrain in the cross-section of the small-sized specimens. Three modes of prestraining were selected in this study; unidirectional, twistback, and single- or cyclic-reversed torsion. Fracture ductility decreased almost linearly with increasing unidirectional prestrain, while the decrease of fracture ductility in the other modes of prestrain was much less than that in the unidirectional one. A transitional decrease in fracture ductility, which has been reported for inhomogeneously prestrained specimens, was not observed in this study. A slight trace of recovery in fracture ductility due to twisting back the unidirectional prestrain to the macroscopically undistorted original state was observed, in contrast with the almost complete recovery for the inhomogeneously prestrained specimens. The low-cycle life of the unidirectionally prestrained specimens was reduced by an amount which would be predictable from the decrease in fracture ductility of those specimens. For other modes of prestrain, however, the influence on fatigue life was undistinguishably small in this study.

• 一般社団法人日本機械学会の論文

著者

• Ogura Keiji

  Assistant Professor Faculty Of Engineering Osaka University

• HARADA Shoji

  Research Assistant, Faculty of Engineering, Osaka University

• OHJI Kiyotsugu

  Faculty of Engineering, Osaka University

• OGURA Keiji

  Faculty of Engineering, Osaka University

• HARADA Shoji

  Faculty of Engineering, Osaka University

• UEHARA Hisanori

  Hitachi, Ltd.

• NOMURA Matsutaro

  Teijin seiki, Ltd.

• Ogura Keiji

  Faculty Of Engineering Science Osaka University

• Harada Shoji

  Research Assistant Faculty Of Engineering Osaka University

• Ohji Kiyotsugu

  Professor Faculty Of Engineering Osaka University

• Ohji Kiyotsugu

  Faculty Of Engineering Osaka University

• Uehara Hisanori

  Hitachi Ltd.

• Nomura Matsutaro

  Teijin Seiki Ltd.

• Harada Shoji

  Faculty Of Engineering Osaka University

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