Effects of material rate sensitivity and void nucleation on fracture initiation in a circumferentially cracked bar

Brian Moran*, R. J. Asaro, C. F. Shih

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The influence of material strain rate sensitivity and void nucleation on crack tip stress and deformation fields has been evaluated for the case of a circumferentially cracked bar. Loading is assumed to occur at two very different rates which correspond to the quasi-static and high rate tests of Couque et al.1 A strain rate-dependent version of Gurson’s2 porous-plastic constitutive theory is used which accounts for microvoid nucleation and for void growth by plastic deformation. A phenomenological fracture initiation criterion is used to model the onset of crack growth for the purpose of simulating the fracture toughness tests performed by Couque et al. on a 1020 plain carbon steel. The computed results support the conclusions reached by Couque et al. on relating fracture toughness values obtained at loading rates on the order of KI = 1 MPa s−1 and KI = 106 MPa s−1.

Original languageEnglish (US)
Pages (from-to)161-170
Number of pages10
JournalMetallurgical Transactions A
Volume22
Issue number1
DOIs
StatePublished - Jan 1 1991

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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