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Enhanced multiaxial fatigue criterion that considers stress gradient effects

Ottosen, Niels Saabye LU ; Ristinmaa, Matti LU and Kouhia, Reijo (2018) In International Journal of Fatigue 116. p.128-139
Abstract

Modification of a fatigue criterion valid for homogeneous multiaxial stress states to account for the beneficial effect of stress gradients is traditionally performed by modifying the stress terms in the fatigue criterion and thereby introducing new parameters that need to be calibrated. Here the stress terms are left unchanged and, instead, the parameters in the fatigue criterion are modified. This modification is performed, in principle, along the lines of Siebel and Stieler and it introduces Neuber's parameter as the only new parameter; however, as soon as the ultimate strength of the material is known, also Neuber's parameter is known. Therefore, the methodology introduced implies that no new calibration process is needed. Here a... (More)

Modification of a fatigue criterion valid for homogeneous multiaxial stress states to account for the beneficial effect of stress gradients is traditionally performed by modifying the stress terms in the fatigue criterion and thereby introducing new parameters that need to be calibrated. Here the stress terms are left unchanged and, instead, the parameters in the fatigue criterion are modified. This modification is performed, in principle, along the lines of Siebel and Stieler and it introduces Neuber's parameter as the only new parameter; however, as soon as the ultimate strength of the material is known, also Neuber's parameter is known. Therefore, the methodology introduced implies that no new calibration process is needed. Here a specific fatigue criterion valid for homogeneous multiaxial stress states is enhanced by this procedure and predictions of this simple approach are compared with a broad range of experimental data and good accuracy is achieved. Moreover, the approach adopted can be applied to other fatigue criteria than the one considered here.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Fatigue, Gradient effects, Multiaxial fatigue
in
International Journal of Fatigue
volume
116
pages
12 pages
publisher
Elsevier
external identifiers
  • scopus:85048733879
ISSN
0142-1123
DOI
10.1016/j.ijfatigue.2018.05.024
language
English
LU publication?
yes
id
e94d2ee8-2433-4398-ba4e-5cbc8e08b41f
date added to LUP
2018-06-27 15:20:53
date last changed
2019-03-12 04:12:13
@article{e94d2ee8-2433-4398-ba4e-5cbc8e08b41f,
  abstract     = {<p>Modification of a fatigue criterion valid for homogeneous multiaxial stress states to account for the beneficial effect of stress gradients is traditionally performed by modifying the stress terms in the fatigue criterion and thereby introducing new parameters that need to be calibrated. Here the stress terms are left unchanged and, instead, the parameters in the fatigue criterion are modified. This modification is performed, in principle, along the lines of Siebel and Stieler and it introduces Neuber's parameter as the only new parameter; however, as soon as the ultimate strength of the material is known, also Neuber's parameter is known. Therefore, the methodology introduced implies that no new calibration process is needed. Here a specific fatigue criterion valid for homogeneous multiaxial stress states is enhanced by this procedure and predictions of this simple approach are compared with a broad range of experimental data and good accuracy is achieved. Moreover, the approach adopted can be applied to other fatigue criteria than the one considered here.</p>},
  author       = {Ottosen, Niels Saabye and Ristinmaa, Matti and Kouhia, Reijo},
  issn         = {0142-1123},
  keyword      = {Fatigue,Gradient effects,Multiaxial fatigue},
  language     = {eng},
  month        = {11},
  pages        = {128--139},
  publisher    = {Elsevier},
  series       = {International Journal of Fatigue},
  title        = {Enhanced multiaxial fatigue criterion that considers stress gradient effects},
  url          = {http://dx.doi.org/10.1016/j.ijfatigue.2018.05.024},
  volume       = {116},
  year         = {2018},
}