A simplified method to estimate elastic-plastic fracture mechanics parameters under combined primary and secondary stresses

Yun Jae Kim, Chang Gyun Oh, Jong Sung Kim, Tae Eun Jin

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Abstract

Detailed two- and three-dimensional finite element analyses are performed to develop an engineering method to estimate elastic-plastic J for cracked structures under combined primary and secondary stresses, based on the V-factor. Extensive analyses with a wide range of geometry and load combination are considered. The results suggest important factors affecting the value of the V-factor. The most important one is the load magnitude, parameterized by the proximity of plastic yielding. The second one is the relative magnitude of the secondary stress to the primary stress. Although the effect of material, in particular materials with Lüders strain seems to be present, such an effect could be neglected, compared to those of the above two parameters. Based on the present results, an engineering method to estimate J for combined primary and secondary stress can be proposed using bilinear equations in terms of the above two parameters.

Original languageEnglish
Pages (from-to)655-660
Number of pages6
JournalKey Engineering Materials
Volume306-308 I
Publication statusPublished - 2006 Mar 17

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Keywords

  • Combined primary and secondary stress
  • Finite element analysis
  • J-integral
  • V-factor

ASJC Scopus subject areas

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

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