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Title: Validation of a cyclic plasticity computational method using fatigue full-field deformation measurements
Authors: Cuadra, J.
Baxevanakis, Konstantinos P.
Loghin, A.
Kontsos, A.
Keywords: Digital image correlation
Cyclic plasticity
Fatigue crack growth
Validation
Issue Date: 2016
Publisher: © Wiley
Citation: CUADRA, J. ... et al, 2016. Validation of a cyclic plasticity computational method using fatigue full-field deformation measurements. Fatigue and Fracture of Engineering Materials and Structures, 39 (6), pp. 722-736.
Abstract: The evolution of crack tip displacement and strain fields during uniaxial, room temperature, low-cycle fatigue experiments of Nickel superalloy compact tension specimens was measured by a digital image correlation approach and was further used to validate a cyclic plasticity model and corresponding deformation calculations made by a finite elements methodology. The experimental results provided data trends for the opening displacements and near crack tip strains as function of cycles. A finite element model was developed to capture test conditions for a measured crack size. The model captures crack tip plasticity by using a constitutive model calibrated against stress-strain measurements performed on a round bar. Similar quantities were extracted from the model predictions to compare with the digital image correlation measurements for model validation purposes. This type of direct comparison demonstrated that the computational model was capable to adequately capture the crack opening displacements at various stages of the specimen's fatigue life, providing in this way a tool for quantitative cyclic plasticity model validation. In addition, this integrated experimental-computational approach provides a framework to accelerate our understanding related to interactions of fatigue test data and models, as well as ways to inform one another.
Description: This is the peer reviewed version of the following article: CUADRA, J. ... et al, 2016. Validation of a cyclic plasticity computational method using fatigue full-field deformation measurements. Fatigue and Fracture of Engineering Materials and Structures, 39 (6), pp. 722-736, which has been published in final form at http://dx.doi.org/10.1111/ffe.12396. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Version: Accepted for publication
DOI: 10.1111/ffe.12396
URI: https://dspace.lboro.ac.uk/2134/25784
Publisher Link: http://dx.doi.org/10.1111/ffe.12396
ISSN: 8756-758X
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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