Assessment of fatigue crack initiation after overloads with substructure-sensitive crystal plasticity

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dc.contributor.authorDindarlou, Shahram
dc.contributor.authorCastelluccio, Gustavo M.
dc.date.accessioned2025-04-16T10:07:47Z
dc.date.available2025-04-16T10:07:47Z
dc.date.freetoread2025-04-16
dc.date.issued2025-09
dc.date.pubOnline2025-04-04
dc.description.abstractMicrostructure-sensitive fatigue initiation prognosis approaches typically assume uniform periodic loading and often overlook in-service overloads, which increase uncertainty and reduce life prediction accuracy. Similarly, certification efforts rarely evaluate experimentally the impact of different overloads due to the prohibitive costs. Therefore, predictive models that estimate overload effects on fatigue initiation damage without extensive experimental data are valuable to improve prognosis approaches. However, the literature lacks microstructure-sensitive approaches capable of assessing overload effects with models that simultaneously predict monotonic and cyclic responses without recalibration. This work presents a novel strategy to predict the effects of overloads on early cyclic damage by evaluating the refinement dislocation structures. A substructure-based crystal plasticity approach relies on independent parameterizations from monotonic and cyclic loading to predict overload responses, without requiring additional experiments. The model agreement with macroscale experiments was further validated by comparing dominant mesoscale structures after overloads in single- and poly-crystals for metals and alloys. The analysis also identified overload-resistant crystal orientations and demonstrated that overloads increase the likelihood of initiating fatigue cracks in low apparent Schmid factor grains under low-amplitude fatigue. We conclude by discussing the value of material-invariant mesoscale parameters to rank overloads effect for materials and loading conditions for which no experiments are available.
dc.description.journalNameInternational Journal of Fatigue
dc.description.sponsorshipGMC thanks The EPSRC, UK for funding under EPSRC grant EP/R034478/1.
dc.identifier.citationDindarlou S, Castelluccio GM. (2025) Assessment of fatigue crack initiation after overloads with substructure-sensitive crystal plasticity. International Journal of Fatigue, Volume 198, September 2025, Article number 108937
dc.identifier.elementsID672775
dc.identifier.issn0142-1123
dc.identifier.paperNo108937
dc.identifier.urihttps://doi.org/10.1016/j.ijfatigue.2025.108937
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23788
dc.identifier.volumeNo198
dc.languageEnglish
dc.language.isoen
dc.publisherElsevier
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0142112325001343?via%3Dihub
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject40 Engineering
dc.subject4016 Materials Engineering
dc.subjectMechanical Engineering & Transports
dc.subject4005 Civil engineering
dc.subject4016 Materials engineering
dc.subject4017 Mechanical engineering
dc.subjectCrystal plasticity
dc.subjectMesoscale structure
dc.subjectOverload effects
dc.subjectCyclic deformation history
dc.titleAssessment of fatigue crack initiation after overloads with substructure-sensitive crystal plasticity
dc.typeArticle
dc.type.subtypeJournal Article
dcterms.dateAccepted2025-03-12

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