Microstructure-sensitive estimation of small fatigue crack growth in bridge steel welds

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dc.contributor.author Yuan, Hao
dc.contributor.author Zhang, Wei
dc.contributor.author Castelluccio, Gustavo M.
dc.contributor.author Kim, Jeongho
dc.contributor.author Liu, Yongming
dc.date.accessioned 2018-06-01T14:27:52Z
dc.date.available 2018-06-01T14:27:52Z
dc.date.issued 2018-03-15
dc.identifier.citation Hao Yuan, Wei Zhang, Gustavo M. Castelluccio, et al. Microstructure-sensitive estimation of small fatigue crack growth in bridge steel welds. International Journal of Fatigue, Volume 112, July 2018, Pages 183-197 en_UK
dc.identifier.issn 0142-1123
dc.identifier.uri https://doi.org/10.1016/j.ijfatigue.2018.03.015
dc.identifier.uri https://dspace.lib.cranfield.ac.uk/handle/1826/13229
dc.description.abstract A probabilistic finite element model is implemented to estimate microstructurally small fatigue crack growth in bridge steel welds. Simulations are based on a microstructure-sensitive crystal plasticity model to quantify fatigue indicator parameters (FIPs) at the slip system level and a fatigue model that relates FIPs to fatigue lives of individual grains. Microstructures from three weld zones, namely, fusion zone (FZ), heat affected zone (HAZ), and base metal (BM), are constructed based on their microstructural attributes such as grain morphology, size, and orientation. Statistical volume elements (SVEs) are generated and meshed independently for the three welding zones. Each grain within the SVEs is divided into several slip bands parallel to crystallographic planes. During the loading process, cracks nucleate at the slip bands (SBs) with the largest FIP next to the free surface. The crack extension path is assumed to be transgranular along SBs and the number of cycles required to crack the neighbor grain is calculated by the corresponding FIP-based crack growth rate equation. The simulation process is carried out using ABAQUS with a user defined subroutine UMAT for crystal plasticity. After the calibration of the constitutive model and irreversibility parameters, numerical simulations for small crack growth in three zones are presented. The crack length vs. the predicted fatigue resistance shows significant differences in the mean values and variability among the three weld zones. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.subject High cycle fatigue (HCF) en_UK
dc.subject Small fatigue crack en_UK
dc.subject Probabilistic en_UK
dc.subject Microstructure en_UK
dc.subject Crystal plasticity en_UK
dc.title Microstructure-sensitive estimation of small fatigue crack growth in bridge steel welds en_UK
dc.type Article en_UK

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