Steady-State Crack Growth in Rate-Sensitive Single Crystals

Kristian Jørgensen Juul, Kim Lau Nielsen, Christian Frithiof Niordson

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Abstract

The characteristics of the active plastic zone surrounding a crack growingin a single crystal (FCC, BCC, and HCP) at constant velocity is investigated for ModeI loading under plane strain assumptions. The framework builds upon a steady-state relation bringing the desired solution out in a frame translating with the crack tip. In the study, the shielding of the crack tip that follows from plastic slip is investigated by adopting the SSV-model. High resolution plots of the plastic zones are obtained and a detailed study confirms the existence of analytically determined velocity discontinuities from the literature. The plastic zone is found to be smallest for the FCC structure andlargest for the HCP structure, which is also reected in the shielding ratio, where FCC crystals show the smallest shielding and HCP the largest shielding.
Original languageEnglish
Title of host publicationProceedings of the 29th Nordic Seminar on Computational Mechanics (NSCM-29)
EditorsR. Larsson
Number of pages4
Publication date2016
Publication statusPublished - 2016
Event29th Nordic Seminar on Computational Mechanics - Gothenburg, Sweden
Duration: 26 Oct 201628 Oct 2016

Conference

Conference29th Nordic Seminar on Computational Mechanics
CountrySweden
CityGothenburg
Period26/10/201628/10/2016

Keywords

  • Quasi-static crack growth
  • Crystal plasticity
  • Plastic zones
  • Shielding ratio

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