On the connection between mode II and mode III effective thresholds in metals
Loading...
Date
2017-07-01
ORCID
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Italian Group of Fracture
Altmetrics
Abstract
Closure-free long cracks under the remote mode III loading grow in a more complicated way than those under the remote mode II. For bcc metals, a coplanar in-plane spreading of tongues driven by the local mode II loading components at crack-front asperities prevails while twisting of crack-front segments to mode I, often leading to factory-roof morphology, is typical for other materials. In bcc metals, therefore, the formulation of a quantitative relationship connecting effective thresholds in modes II and III demands to calculate the local mode II components of stress intensity factors at typical asperities of a crack front loaded in the remote mode III. Therefore, a numerical model of a serrated crack front was created and the results were compared with experimentally determined ratio of mode II and III effective thresholds for the ARMCO iron. Although the calculated crack-front roughness needs an experimental verification, the preliminary results indicate that the model can provide a quantitative explanation of the experimentally observed ratio of mode II and mode III effective thresholds in bcc metals.
Description
Citation
Frattura ed Integrita Strutturale. 2017, vol. 11, issue 41, p. 245-251.
https://www.fracturae.com/index.php/fis/article/view/IGF-ESIS.41.33
https://www.fracturae.com/index.php/fis/article/view/IGF-ESIS.41.33
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en