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A generalized probabilistic model for cleavage fracture with a length scale - Influence of stress state and application to surface cracked experiments
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0002-8408-8489
Swedish Def Res Agcy FOI, SE-16490 Stockholm, Sweden..
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0003-1498-5691
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2019 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 214, p. 590-608Article in journal (Refereed) Published
Abstract [en]

A probabilistic model for the cumulative probability of failure by cleavage fracture with a material related length scale is further developed in this study. A new generalized effective stress measure is proposed, based on a normal stress decomposition of the stress tensor, capable of describing a state of normal stress in the range from the mean stress to the maximum principal stress. The effective stress measure associated with a material point is evaluated from the stress tensor averaged over the material related length scale. The model is shown to be well capable to predict both the fracture toughness at loss of both in-plane and out-of-plane constraint by model application to two different datasets from the open literature. The model is also shown to be well capable of predicting the probability of failure of discriminating experiments on specimens containing semi-elliptic surface cracks. A comparison where the master curve methodology is used to predict the probability of failure of the experiments is also included.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 214, p. 590-608
Keywords [en]
Cleavage fracture, Brittle fracture, Non-local stress, Weakest link, Semi-elliptic surface crack
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-252591DOI: 10.1016/j.engfracmech.2019.03.041ISI: 000467694000040OAI: oai:DiVA.org:kth-252591DiVA, id: diva2:1322762
Note

QC 20190611

Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-06-11Bibliographically approved

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Boåsen, MagnusEfsing, PålFaleskog, Jonas

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