Evaluation of Ductile Fracture of Structural Steels by Microvoid Model.

• Qiu Hai

  Research Center for Advanced Science and Technology, The University of Tokyo

• Mori Hisashi

  Research Center for Advanced Science and Technology, The University of Tokyo

• Enoki Manabu

  Research Center for Advanced Science and Technology, The University of Tokyo

• Kishi Teruo

  Research Center for Advanced Science and Technology, The University of Tokyo

Abstract

In the present work, the ductile fracture of structural steels and the effect of plastic pre-strain on ductility have been investigated by tensile test. The fracture process consisting of void nucleation, growth and coalescence was observed by scanning electron microscopy (SEM). The nucleation strain of microvoid was measured experimentally. The critical interfacial strength of particle/matrix interface was calculated by dislocation model and continuum analysis, and the void growth was evaluated by Rice-Tracey model. It was found that longitudinal void coalescence does not affect fracture even though large cracks exist, but particle position affects void nucleation. Thomason's plastic limit-load model was used to predict void growth strain. Through the analysis of ductile fracture process, the influence of plastic pre-strain on ductility was discussed.

Journal

• ISIJ International

  ISIJ International 39 (4), 358-364, 1999

  The Iron and Steel Institute of Japan

Keywords

• ductile fracture
• void initiation
• void growth
• void coalescence

Details

• CRID: 1390282681429572736
• NII Article ID: 10002462861
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.39.358
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/39/4/39_4_358/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed