Evaluation of local deformation behavior accompanying fatigue damage in F82H welded joint specimens by using digital image correlation

Toshiya Nakata, Hiroyasu Tanigawa

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

By using digital image correlation, the deformation behaviors of local domains of F82H joint specimens welded using tungsten inert gas (TIG) and electron beam (EB) welding were evaluated during tensile and fatigue testing. In the tensile test specimens, the tensile strength decreased in the TIG-welded joints, and ductility decreased in both the EB- and TIG-welded joints. Because axial strain increased in the tempered heat-affected zone (HAZ) and led to the fracture of the TIG-welded joint, the strength was considered to have decreased because of welding. In fatigue testing, the number of cycles to fracture for the welded joint decreased to less than 40-60% of that for the base metal. For both fracture specimens, the largest value of shear strain was observed in the region approximately between the fine-grained HAZ and tempered HAZ; this shear strain ultimately led to fracture. Cavities and macrocracks were observed in the fine-grained HAZ and tempered HAZ in the cross sections of the fracture specimens, and geometrical damage possibly resulted in the reduction of fatigue lifetime.

Original languageEnglish
Pages (from-to)589-593
Number of pages5
JournalFusion Engineering and Design
Volume87
Issue number5-6
DOIs
Publication statusPublished - Aug 1 2012

Keywords

  • Digital image correlation
  • F82H
  • Fatigue
  • Local deformation
  • Welding

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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