University of Oulu

Lindroos, M., Scherer, J.-M., Forest, S., Laukkanen, A., Andersson, T., Vaara, J., Mäntylä, A., & Frondelius, T. (2022). Micromorphic crystal plasticity approach to damage regularization and size effects in martensitic steels. International Journal of Plasticity, 151, 103187.

Micromorphic crystal plasticity approach to damage regularization and size effects in martensitic steels

Saved in:
Author: Lindroos, Matti1; Scherer, Jean-Michel2,3; Forest, Samuel2;
Organizations: 1Integrated Computational Materials Engineering, VTT, Espoo, Finland
2MINES ParisTech, PSL University, MAT – Centre des matériaux, CNRS UMR 7633, BP 87 91003, Evry, France
3Université Paris-Saclay, CEA, Service d’Étude des Matériaux Irradiés, 91191, Gif-sur-Yvette, France
4R&D and Engineering, Wärtsilä, P.O. Box 244, 65101, Vaasa, Finland
5University of Oulu, Erkki Koiso-Kanttilan katu 1, 90014, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.9 MB)
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2022-06-22


A reduced micromorphic model is formulated in the scope of crystal plasticity and crystalline cleavage damage. The finite strain formulation utilizes a single additional microvariable that is used to regularize localized inelastic deformation mechanisms. Damage is formulated as a strain-like variable to fit the generalized micromorphic microslip and/or microdamage based formulation. Strategies of treating slip and damage simultaneously and separately as non-local variables are investigated. The model accounts for size-effects that simultaneously affect the hardening behavior and allow to predict finite width damage localization bands. The results show that the micromorphic extension introduces extra-hardening in the vicinity of grain boundaries and slip localization zones in polycrystals. At the single crystal level slip band width is regularized. Two ways of dealing with damage localization were identified: An indirect method based on controlling width of slip bands that act as initiation sites for damage and a direct method in which damage flow is regularized together with or separately from plastic slip. Application to a real martensitic steel microstructure is investigated.

see all

Series: International journal of plasticity
ISSN: 0749-6419
ISSN-E: 1879-2154
ISSN-L: 0749-6419
Volume: 151
Article number: 103187
DOI: 10.1016/j.ijplas.2021.103187
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors would like to acknowledge the financial support of Business Finland in the form of a research projects ISA Wärtsilä Dnro 7734/31/2018 and ISA VTT Dnro 7980/31/2018. Matti Lindroos has received funding from the Euratom research and training programme 2019–2020 under grant agreement No 900018 (ENTENTE project) related to the model development of this work. Tomi Suhonen is acknowledged for providing in-situ SEM tensile test data and SEM images for analysis.
Copyright information: © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license.