Micro-macro combined simulation of the damage progress in low-alloy steel welds subject to type IV creep failure

Fumiko Kawashima, Toshihide Igari, Takumi Tokiyoshi, Akira Shiibashi, Naoya Tada

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A simulation method for microscopic creep damage at grain boundaries in the fine-grain heat-affected zone of low-alloy steel welds involving high energy piping was proposed on the basis of the combination of elastic-creep FEM analysis and random fracture resistance modeling of the materials. First, the initiation and growth-driving forces of small defects were concretely determined based on microscopic observation of the damage progress at the grain boundaries of the material, taking into account dependence on stress and temperature. Then, a simulation procedure combining the stress distribution from elastic-creep FEM and the random fracture resistance model was proposed, and this procedure was applied to the simulation of the microscopic damage progress in a welded joint model test and in actual power piping. The results in terms of the simulated number density of small defects throughout the wall thickness were in good agreement with the observed results.

Original languageEnglish
Pages (from-to)410-418
Number of pages9
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Issue number3
Publication statusPublished - Jul 2004


  • 2.25Cr-1Mo steel
  • Creep damage
  • High-energy piping
  • Numerical simulation
  • Small defect
  • Type IV
  • Welding

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering


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