Fully plastic analyses for notched bars and plates using finite element limit analysis

Yun Jae Kim, Chang Kyun Oh, Man Sik Myung, Jin Moo Park

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In the present work, fully plastic analyses for notched bars and (plane strain) plates in tension are performed, via finite element (FE) limit analysis based on non-hardening plasticity, from which plastic limit loads and stress fields are determined. Relevant geometric parameters are systematically varied to cover all possible ranges of the notch depth and radius. For the limit loads, it is found that the FE solutions for the notched plate agree well with the existing solution. For the notched bar, however, the FE solutions are found to be significantly different from known solutions, and accordingly the new approximation is given. Regarding fully plastic stress fields, it is found that, for the notched plate, the maximum hydrostatic (mean normal) stress overall occurs in the center of the specimen, which strongly depends on the relative notch depth and the notch radius-to-depth ratio. On the other hand, for the notched bar, the maximum hydrostatic stress can occur in between the center of the specimen and the notch tip. The maximum hydrostatic stress for a given notch depth can occur not for the cracked case, but for the notched case with a certain radius. This is true for both bars and plates. For a given notch radius, on the other hand, the maximum hydrostatic stress increases monotonically with the decreasing notch radius.

Original languageEnglish
Pages (from-to)1849-1864
Number of pages16
JournalEngineering Fracture Mechanics
Volume73
Issue number13
DOIs
Publication statusPublished - 2006 Sep

Keywords

  • Finite element limit analysis
  • Limit load
  • Notched bar
  • Notched plate
  • Stress triaxiality

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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