On the relations between the threshold values of the fatigue crack growth and the cyclic deformation behavior of materials

Sun Yi, Zhang Rui, Qu Jianmin

Research output: Contribution to journalConference articlepeer-review

Abstract

In the present paper, the relation between fatigue crack growth threshold and material's cyclic saturation behavior is investigated. The dislocation-free zone (DFZ) model is used to determine the dislocation distribution ahead of the crack tip. A cohesive zone model is developed to determine the stress field of the DFZ under cyclic loading. The effect of cyclic loading makes the plastic zone hardening (or softening), which raises the stress level in DFZ, and may lead to fracture. It is found that the near threshold characteristics are mostly determined by the cyclic deformation behavior of the material, and might be theoretically determinable from the standard cyclic loading test.

Original languageEnglish
Pages (from-to)1053-1056
Number of pages4
JournalKey Engineering Materials
Volume353-358
Issue numberPART 2
StatePublished - 2007
EventAsian Pacific Conference for Fracture and Strength (APCFS'06) - Sanya, Hainan Island, China
Duration: 22 Nov 200625 Nov 2006

Keywords

  • Cyclic deformation behavior
  • Dislocation-free zone model
  • Fatigue crack growth

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