Plastic loads of elbows with local wall thinning under in-plane bending

Chang Sik Oh, Yun Jae Kim, Chi Yong Park

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Based on systematic three-dimensional (3-D), large strain FE limit analyses using elastic- perfectly plastic materials, this paper quantifies the effect of local wall thinning on plastic behavior and TES (twice-elastic-slope) plastic loads for 90° elbows under in-plane bending. The thinning geometry is assumed to be rectangular rather than circular, but the nonlinear geometry effect is fully considered. Results from systematic analyses lead to simple approximations for TES plastic loads, covering a wide range of elbow and thinning geometries. Although the proposed approximations are developed for the case when wall thinning locates in the center of the elbow, it is also shown that they can be equally applied to the case when thinning exists anywhere within the elbow. Brief discussion is made on application of the proposed approximations to estimate maximum load-carrying capacities of elbows with local wall thinning.

Original languageEnglish
Pages (from-to)63-79
Number of pages17
JournalInternational Journal of Fracture
Issue number1
Publication statusPublished - 2007 May
Externally publishedYes


  • Elbow
  • Large strain FE limit analysis
  • Local wall thinning
  • Twice-elastic-slope plastic load

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Mechanics of Materials


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