Measurement and simulation of crack growth rate and direction under non-proportional loadings
DOI:
https://doi.org/10.3221/IGF-ESIS.34.14Keywords:
Multiaxial fatigueAbstract
A series of fatigue experiments on thin-walled tubes under tension and torsion, the experimental
results – crack path and crack growth life – are measured and compared. It is observed that the cracks follow a
curvature from a tensile to a shear dominated growth with increasing crack length. The results are enforced by
the high amplitudes applied to the specimens causing large cyclic plastic deformations and crack growth rates in the order of 10-3 mm/cycle. The non-linear nature of the cyclic deformation has been taken into account by
applying a cyclic plasticity model, and plasticity-induced crack closure is captured by a contact formulation.
Already for the uniaxial reference case the current limitations in modelling plasticity induced crack closure – a
prerequisite for achieving realistic simulation results – have become obvious. Measurements have shown that
friction and roughness induced closure processes come up, especially for non-planar crack surfaces, challenge to be met in the future.
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.