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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/19207

Title: Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity
Authors: Farukh, Farukh
Zhao, Liguo
Jiang, Rong
Reed, Philippa A.S.
Proprentner, Daniela
Shollock, Barbara
Keywords: Crystal plasticity
Realistic microstructure
Cyclic deformation
Extended finite element
Crack growth
Issue Date: 2016
Publisher: © The Authors. Published by Elsevier B.V.
Citation: FARUKH, F. ... et al., 2016. Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity. Computational Materials Science, 111, pp. 395 - 405.
Abstract: 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.
Description: This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
Sponsor: 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.
Version: Published
DOI: 10.1016/j.commatsci.2015.09.054
URI: https://dspace.lboro.ac.uk/2134/19207
Publisher Link: http://dx.doi.org/10.1016/j.commatsci.2015.09.054
ISSN: 0927-0256
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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