A 3D full-field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions

Tim Wigger, Bing Lin, Colin Lupton, James Marrow, Jie Tong

Research output: Contribution to journalArticlepeer-review

59 Downloads (Pure)

Abstract

3D full-field deformation around crack tips in a nuclear graphite has been studied under mode I and mode II cyclic dwell loading conditions using Digital Volume Correlation (DVC) and integrated finite element (FE) analysis. A cracked Brazilian disk specimen of Gilsocarbon graphite was tested at selected loading angles to achieve mode I and mode II cyclic dwell loading conditions. Integrated FE analysis was carried out with the three-dimensional displacement fields measured by DVC injected into the FE model, from which the crack driving force J-integral was obtained using a damaged plasticity material model. The evolution of near-tip strains and the J-integral during the cyclic dwell loading was examined. Under cyclic dwell, residual strain accumulation was observed for the first time. The results shed some light on the effect of dwell time on the 3D crack deformation and crack driving force in Gilsocarbon under cyclic mode I and II loading conditions.
Original languageEnglish
Number of pages12
JournalFatigue & Fracture of Engineering Materials & Structures
Early online date22 Dec 2019
DOIs
Publication statusEarly online - 22 Dec 2019

Keywords

  • cyclic loading
  • DVC
  • dwell
  • graphite
  • mode I
  • mode II
  • residual strain
  • strain accumulation

Fingerprint

Dive into the research topics of 'A 3D full-field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions'. Together they form a unique fingerprint.

Cite this