Effect of localized strain on fracture of high-strength structural steel with varying stress stiffness

L. S. Derevyagina, V. E. Panin, A. I. Gordienko

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2 Citations (Scopus)

Abstract

The paper studies the mechanical properties and configuration of plastic zones in notched high-strength structural steel under tension. Quantitative analysis of the plastic zones is made by constructing strain intensity distribution patterns with the use of the television-optical measuring complex TOMSC. Fracture associated with plastic flow is analyzed by comparing fractographs and distributions of strain characteristics. It is found that the fracture originates in a region with maximum strain intensity. It is shown that the mechanisms of plastic flow in high-strength steel specimens with Π < 1.58 and Π > 4.65, where Π is the index of initial stress stiffness, differ considerably. It is demonstrated that the high-strength steel specimens are fractured by quasibrittle mechanisms; however, ductile micromechanisms through pore nucleation and growth remain operative at all stages of fracture.

Original languageEnglish
Pages (from-to)173-177
Number of pages5
JournalPhysical Mesomechanics
Volume13
Issue number3-4
DOIs
Publication statusPublished - 2010

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Keywords

  • Deformation
  • Fracture
  • Methods of strain measurements
  • Plastic zones
  • Stress state

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces

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