Low-cycle fatigue life prediction of a polycrystalline nickel-base superalloy using crystal plasticity modelling approach

Guang Jian Yuan, Xian Cheng Zhang, Bo Chen, Shan Tung Tu, Cheng-Cheng Zhang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A crystal plasticity model is developed to predict the cyclic plasticity during the low-cycle fatigue of GH4169 superalloy. Accumulated plastic slip and energy dissipation as fatigue indicator parameters (FIPs) are used to predict fatigue crack initiation and the fatigue life until failure. Results show that fatigue damage is most likely to initiate at triple points and grain boundaries where severe plastic slip and energy dissipation are present. The predicted fatigue life until failure is within the scatter band of factor 2 when compared with experimental data for the total strain amplitudes ranging from 0.8% to 2.4%. Microscopically, the adjacent grain arrangements and their interactions account for the stress concentration. In addition, different sets of grain orientations with the same total grain numbers of 150 were generated using the present model. Results show that different sets have significant influence on the distribution of stresses between each individual grain at the meso-scale, although little effect is found on the macroscopic length-scale.

Original languageEnglish
Pages (from-to)28-38
Number of pages11
JournalJournal of Materials Science and Technology
Volume38
Early online date4 Sep 2019
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • Crystal plasticity
  • Fatigue
  • Finite element
  • Life prediction
  • Micro-mechanics
  • Nickel-base superalloy

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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