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Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity

Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity
Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity
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
crystal plasticity, realistic microstructure, cyclic deformation, extended finite element, crack growth
0927-0256
395-405
Farukh, F.
e6825a9b-9e2b-4c1c-b66d-c87e30fc2822
Zhao, L.G.
2caa1a59-631c-4af5-bd68-0c38668a1b97
Jiang, R.
25efdc9b-22fb-45a1-a9ab-21618c79b892
Reed, P
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Proprentner, D
cb4b886f-32e2-4c02-8119-75c055a352e9
Shollock, B.A.
9807ab1a-ef86-4944-a23b-b0c039c25e05
Farukh, F.
e6825a9b-9e2b-4c1c-b66d-c87e30fc2822
Zhao, L.G.
2caa1a59-631c-4af5-bd68-0c38668a1b97
Jiang, R.
25efdc9b-22fb-45a1-a9ab-21618c79b892
Reed, P
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Proprentner, D
cb4b886f-32e2-4c02-8119-75c055a352e9
Shollock, B.A.
9807ab1a-ef86-4944-a23b-b0c039c25e05

Farukh, F., Zhao, L.G., Jiang, R., Reed, P, Proprentner, D and Shollock, B.A. (2016) Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticity. Computational Materials Science, 111, 395-405. (doi:10.1016/j.commatsci.2015.09.054).

Record type: Article

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

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Accepted/In Press date: 25 September 2015
e-pub ahead of print date: 18 October 2015
Published date: January 2016
Keywords: crystal plasticity, realistic microstructure, cyclic deformation, extended finite element, crack growth
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 384009
URI: http://eprints.soton.ac.uk/id/eprint/384009
ISSN: 0927-0256
PURE UUID: 5d86a28b-ab08-4351-a64f-fc5b872c48cb
ORCID for P Reed: ORCID iD orcid.org/0000-0002-2258-0347

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Date deposited: 07 Dec 2015 09:17
Last modified: 15 Mar 2024 02:45

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Contributors

Author: F. Farukh
Author: L.G. Zhao
Author: R. Jiang
Author: P Reed ORCID iD
Author: D Proprentner
Author: B.A. Shollock

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