Micromechanics based modelling of fatigue crack initiation of high strength steel

Journal article

Authors/Editors

Strategic Research Themes

Publication Details

Author list: Yuenyong J., Uthaisangsuk V.

Publisher: Elsevier

Publication year: 2020

Volume number: 139

ISSN: 0142-1123

eISSN: 1879-3452

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85086821000&doi=10.1016%2fj.ijfatigue.2020.105762&partnerID=40&md5=dad888bf7167e2a7682f19056faad2a9

Languages: English-Great Britain (EN-GB)

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Abstract

The cyclic behaviour and fatigue crack initiation in low cycle regime of dual phase (DP) steel grade 590 were characterized. Experimental strain-controlled tension–compression tests and corresponding simulations using representative volume elements were carried out. The Chaboche kinematic hardening parameters were determined for each individual phases. The damage model based on accumulated inelastic hysteresis energy was incorporated for describing crack onset mechanism in the microstructure. Damage parameters were calibrated with experimental strain-life curves for crack initiation state. Effects of pre-strain on crack occurrence of steel were studied. Observed crack initiation and its life were well predicted by the proposed modelling scheme. © 2020 Elsevier Ltd

Keywords

Chaboche hardening model, Hysteresis energy criterion, Pre-straining