Two-way coupled modeling of dislocation substructure sensitive crystal plasticity and hydrogen diffusion at the crack tip of FCC single crystals

Simple item page
dc.contributor.authorGu, Tang
dc.contributor.authorWang, Baolin
dc.contributor.authorZhu, Ting
dc.contributor.authorCastelluccio, Gustavo M.
dc.contributor.authorMcDowell, David L.
dc.date.accessioned2024-10-15T13:40:02Z
dc.date.available2024-10-15T13:40:02Z
dc.date.freetoread2025-09-20
dc.date.issued2025-01-01
dc.date.pubOnline2024-09-19
dc.description.abstractDislocation substructure-sensitive crystal plasticity (DSS-CP) modeling accounts for the evolution of mesoscale structures using dislocation-based parameters informed by experiments and computation at various lower length scales. To a first-order approximation, DSS-CP model parameters are affected by hydrogen (H) concentration, accounting for both H-dependent yield strength and strain hardening rate. This H-affected DSS-CP model is two-way coupled with H-diffusion to explore both effects of plastic deformation on H-diffusion and effects of H on yield strength and strain hardening in the DSS-CP model. Crack tip simulations are performed for face-centered cubic (FCC) metals under monotonic loading conditions with and without H. Enhanced maximum plastic deformation in the vicinity of the crack tip (i.e., localization or intensification of plastic strain) and crack tip opening displacement (CTOD) are predicted in the presence of H, consistent with experimental observations. In spite of increased initial strength due to H, subsequent reduction of the rate of strain hardening in the presence of H is shown to enhance localization of crack tip plasticity. Furthermore, this modeling framework predicts that higher H-diffusivity (leading to a larger H-affected zone) will enhance the crack tip plasticity, making use of the two-way coupling algorithm implemented in this work. On the other hand, we find that the H-sensitivity of crack tip strain localization response, based only on modification of model parameters, is too weak to explain typical experimental observations. This points to the need to develop more advanced DSS-CP constitutive relations that consider highly complex dislocation interactions with point defects.
dc.description.journalNameInternational Journal of Solids and Structures
dc.description.sponsorshipWe acknowledge the financial support of the Fluor Marine Propulsion, LLC.
dc.identifier.citationGu T, Wang B, Zhu T, et al., (2025) Two-way coupled modeling of dislocation substructure sensitive crystal plasticity and hydrogen diffusion at the crack tip of FCC single crystals. International Journal of Solids and Structures, Volume 306, January 2025 , Article number 113072
dc.identifier.elementsID554023
dc.identifier.issn0020-7683
dc.identifier.paperNo113072
dc.identifier.urihttps://doi.org/10.1016/j.ijsolstr.2024.113072
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23048
dc.identifier.volumeNo306
dc.languageEnglish
dc.language.isoen
dc.publisherElsevier
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0020768324004311?via%3Dihub
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject40 Engineering
dc.subject4016 Materials Engineering
dc.subjectMechanical Engineering & Transports
dc.subject40 Engineering
dc.titleTwo-way coupled modeling of dislocation substructure sensitive crystal plasticity and hydrogen diffusion at the crack tip of FCC single crystals
dc.typeArticle
dcterms.dateAccepted2024-09-07

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Two-way_coupled_modeling_of_dislocation_substructure-2024.pdf
Size:
2.68 MB
Format:
Adobe Portable Document Format
Description:
Accepted version
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Plain Text
Description:
Download

Collections

Staff publications (SATM)