Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity
journal contributionposted on 2015-10-30, 14:02 authored by Farukh Farukh, Liguo Zhao, Rong Jiang, Philippa A.S. Reed, Daniela Proprentner, Barbara Shollock
Using crystal plasticity, finite element analyses were carried out to model cyclic deformation for a low solvus high refractory (LSHR) nickel superalloy at elevated temperature. The analyses were implemented using a representative volume element (RVE), consisting of realistic microstructure obtained from SEM images of the material. Monotonic, stress-relaxation and cyclic test data at 725 C were used to determine the model parameters from a fitting process and their sensitivity to RVE size and random grain orientation. In combination with extended finite element method (XFEM), the crystal plasticity model was further applied to predict surface crack growth, for which accumulated plastic strain was used as a fracture criterion. Again, realistic microstructure, taken from the cracking site on the surface of a plain fatigue specimen, was used to create the finite element model for crack growth analyses. The prediction was conducted for a pseudo-3D geometrical model, resembling the plane stress condition at specimen surface. The loading level at the cracking site was determined from a viscoplasticity finite element analysis of the fatigue specimen. The proposed model is capable of predicting the variation in growth rate in grains with different orientations.
The work was funded by the EPSRC (Grants EP/K026844/1, EP/ K027271/1 and EP/K027344/1) of the UK and in collaboration with NASA, Alstom, E.On and Dstl.
- Mechanical, Electrical and Manufacturing Engineering
Published inComputational Materials Science
Pages395 - 405 (11)
CitationFARUKH, F. ... et al., 2016. Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity. Computational Materials Science, 111, pp. 395 - 405.
Publisher© The Authors. Published by Elsevier B.V.
- VoR (Version of Record)
Publisher statementThis work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/
NotesThis is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).