3D Analyses of crack propagation in torsion
DOI:
https://doi.org/10.3221/IGF-ESIS.33.07Keywords:
3D imagingAbstract
The initiation and propagation of fatigue cracks during cyclic torsion loading was studied in a cast
Al alloy (A357) with a relatively large (~500 ?m) grain size. 2D observations, revealed that multi site crack
initiation occur on the {111} slip planes exhibiting the highest slip activity (iso-strain Taylor analysis),
preferentially on planes nearly perpendicular to the sample axis. Within the first grain, the cracks have a
pronounced crystallographic propagation mode (mode II crack growth) and strongly interact with the grain
boundaries. In situ 3D monitoring of torsion fatigue tests using synchrotron X-ray tomography reveal that
propagation towards the interior of the samples occurs first along the sample periphery in mode II leading to
relatively shallow cracks which penetrate towards the sample center only after a large number of cycles is
reached .The values of mode I, II and III stress intensity factors have been calculated from finite element
simulation at the tip of the shallow mode II crack. Those values are used to analyse the bulk propagation of the
observed cracks.
Downloads
Downloads
Published
Issue
Section
Categories
License
Copyright
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.
Open Access Statement
Frattura ed Integrità Strutturale (Fracture and Structural Integrity, F&SI) is an open-access journal which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. This is in accordance with the DOAI definition of open access.
F&SI operates under the Creative Commons Licence Attribution 4.0 International (CC-BY 4.0). This allows to copy and redistribute the material in any medium or format, to remix, transform and build upon the material for any purpose, even commercially, but giving appropriate credit and providing a link to the license and indicating if changes were made.
How to Cite
