Normal type fracture of notched round bar under torsion (1st report) - Circumferentially notched round bar.

DOI
  • KIUCHI AKIRA
    (株) 神戸製鋼所機械研究所要素技術センター構造強度技術室
  • AOKI MITSURU
    (株) 神戸製鋼所機械研究所要素技術センター構造強度技術室

Bibliographic Information

Other Title
  • ねじり荷重をうける切欠材の垂直形破壊　Ｉ　　環状切欠を有する場合
  • circumferentially notched round bar
  • 環状切欠を有する場合

Search this article

Description

An experimental study was conducted to investigate the fracture mode and fracture criterion in tearing mode (Mode III). The fracture mode in the deformation of Mode III was classified into two types: normal type and shear type. The former is induced by the maximum tensile stress near the notch tip, (σT)tip, and the latter by shear strain near the notch tip.<br>Circumferentially notched round bars (CNRB) fabricated from polymethylmethacrylate, cast iron and cast steel were loaded to fracture under torsion. It was found that the stress intensity factor in Mode III at which the normal type fracture initiates, KIIIc, is about 2.5 times higher than the fracture toughness in opening mode (Mode I), KIc.<br>In parallel with this, (σT)tip of CNRB under torsion (Mode III) and under tension (Mode I) was analyzed elasto-plastically with the aid of finite element method. For the value of (σT)tip, the corresponding stress intensity factor in Mode III, KIII, is greater than that in Mode I, KI. This is because the constraint to plastic flow in Mode III is much lower than that in Mode I. This numerical result demonstrates that KIIIc is greater than KIc, assuming that the normal type fracture initiates when (σT)tip reaches the critical value.

Journal

Details 詳細情報について

  • CRID
    1390282679592979200
  • NII Article ID
    130004259428
  • DOI
    10.11181/hpi1972.23.85
  • ISSN
    13479598
    03870154
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top