A micromechanical model for ductile fracture of API X65

Chang Kyun Oh, Yun Jae Kim, Jong Hyun Baek, Young Pyo Kim, Woo Sik Kim

Research output: Contribution to journalArticlepeer-review


This paper presents a micro-mechanical model of ductile fracture for the API X65 steel, using the Gurson-Tvergaard-Needleman (GTN) model. Experimental tests and FE damage simulations using the GTN model are performed for smooth and notched tensile bars with three different notch radii, from which micromechanical parameters in the GTN model are calibrated. The calibrated micro-mechanical model is applied to quantify pre-strain effects on plastic deformation and fracture of the API X65 steel. Good agreements of the FE damage results with experimental data suggest confidence in the use of the proposed micro-mechanical model to simulate ductile failure of pipelines made of API X65 steels.

Original languageEnglish
Pages (from-to)43-47
Number of pages5
JournalKey Engineering Materials
Volume321-323 I
Publication statusPublished - 2006


  • API X65
  • Ductile fracture
  • GTN model
  • Micromechanical model
  • Pre-strain effect

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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