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A weakest link model for multiple mechanism brittle fracture — Model development and application
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0002-8408-8489
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0002-9509-2811
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0003-1498-5691
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0003-2470-7679
2021 (English)In: Journal of the mechanics and physics of solids, ISSN 0022-5096, E-ISSN 1873-4782, Vol. 147, article id 104224Article in journal (Refereed) Published
Abstract [en]

A multiple mechanism weakest link model for intergranular and transgranular brittle fracture is developed on the basis of experimental observations of a thermally aged low alloy steel. The model development is carried out in tandem with micro mechanical analysis of grain boundary cracking using crystal plasticity modeling of polycrystalline aggregates with the purpose to inform the weakest link model. The fracture modeling presented in this paper is carried out by using a non-local porous plastic Gurson model where the void volume fraction evolution is regularized over two separate length scales. The ductile crack growth preceding the final brittle fracture is well predicted using this type of modeling. When applied to the brittle fracture tests, the weakest link model predicts the fracture toughness distribution remarkably well, both in terms of the constraint and the size effect. Included in the study is also the analysis of a reference material.

Place, publisher, year, edition, pages
Elsevier BV , 2021. Vol. 147, article id 104224
Keywords [en]
Brittle fracture, Cleavage fracture, Crystal plasticity, Intergranular, Transgranular, Weakest link
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-291149DOI: 10.1016/j.jmps.2020.104224ISI: 000612236400011Scopus ID: 2-s2.0-85097054128OAI: oai:DiVA.org:kth-291149DiVA, id: diva2:1533093
Note

QC 20210303

Available from: 2021-03-03 Created: 2021-03-03 Last updated: 2022-06-25Bibliographically approved

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Boåsen, MagnusDahlberg, Carl F. O.Efsing, PålFaleskog, Jonas

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