Fracture and Structural Integrity e-ISSN 1971-8993 Open access
Miscellanea Vol. 11, No. 41 (2017)

Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation

Author and affiliation details
  • Michael Vormwald Corresponding author vormwald@wm.tu-darmstadt.de
  • Yigiter Hos
  • José L.F. Freire
  • Giancarlo L.G. Gonzáles
  • Jorge G. Díaz
DOI
10.3221/IGF-ESIS.41.42
Pages
Pages 314-322
Published
Published inVol. 11, No. 41 (2017)Go to the issue

Abstract

This paper focusses on discussing equivalent stress intensity factors and kink angles after a change of mode-mixity from one cycle to the next and when the mode-mixity changes continuously during the fatigue cycles. Thin-walled tubes with through-wall cracks have been loaded by proportional and non-proportional tension and torsion. In the experimental investigation, the region of fatigue crack growth was observed by applying the digital image correlation technique. Data on the variations of the displacement and strain fields during the cycles were acquired and used to determine mixed-mode variations of stress intensity factors associated with opening modes I, II and III. For each specific specimen the crack path was observed in order to relate its curvature – both kinks and continuously developing warped cracks – with the variations of the displacement field and associated stress intensity factors.

Keywords

Article history

  1. ReceivedUntil the next stage: 0 days
  2. AcceptedUntil the next stage: 0 days
  3. Published

How to cite

APA

Vormwald, M., Hos, Y., Freire, J. L., Gonzáles, G. L., & Díaz, J. G. (2017). Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation. Fracture and Structural Integrity, 11(41), Pages 314–322. https://doi.org/10.3221/IGF-ESIS.41.42

IEEE

M. Vormwald, Y. Hos, J. L. Freire, G. L. Gonzáles, and J. G. Díaz, “Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation,” Fracture and Structural Integrity, vol. 11, no. 41, pp. Pages 314–322, 2017, doi: 10.3221/IGF-ESIS.41.42.

MLA

Vormwald, Michael, et al. “Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation.” Fracture and Structural Integrity, vol. 11, no. 41, 2017, pp. Pages 314–322. https://doi.org/10.3221/IGF-ESIS.41.42.

Chicago

Vormwald, Michael, Yigiter Hos, José L.F. Freire, Giancarlo L.G. Gonzáles, and Jorge G. Díaz. 2017. “Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation.” Fracture and Structural Integrity 11 (41): Pages 314–322. https://doi.org/10.3221/IGF-ESIS.41.42.

Harvard

Vormwald, M., Hos, Y., Freire, J.L., Gonzáles, G.L. and Díaz, J.G. (2017) ‘Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation’, Fracture and Structural Integrity, 11(41), pp. Pages 314–322. doi: 10.3221/IGF-ESIS.41.42.

Vancouver

Vormwald M, Hos Y, Freire JL, Gonzáles GL, Díaz JG. Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation. Fracture and Structural Integrity. 2017;11(41):Pages 314-322. doi:10.3221/IGF-ESIS.41.42

BibTeX

@article{vormwald2017, author = {Vormwald, Michael and Hos, Yigiter and Freire, José L.F. and Gonzáles, Giancarlo L.G. and Díaz, Jorge G.}, title = {Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation}, journal = {Fracture and Structural Integrity}, year = {2017}, volume = {11}, number = {41}, pages = {Pages 314--322}, doi = {10.3221/IGF-ESIS.41.42}, url = {https://doi.org/10.3221/IGF-ESIS.41.42}, issn = {1971-8993} }

RIS

TY - JOUR AU - Vormwald, Michael AU - Hos, Yigiter AU - Freire, José L.F. AU - Gonzáles, Giancarlo L.G. AU - Díaz, Jorge G. TI - Variable mode-mixity during fatigue cycles – crack tip parameters determined from displacement fields measured by digital image correlation JO - Fracture and Structural Integrity T2 - Fracture and Structural Integrity PY - 2017 DA - 2017/06/28 VL - 11 IS - 41 SP - Pages 314 EP - 322 DO - 10.3221/IGF-ESIS.41.42 UR - https://doi.org/10.3221/IGF-ESIS.41.42 SN - 1971-8993 ER -

Licence

Copyright © 2017 Fracture and Structural Integrity.

Copyright 
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.  

Open Access Statement

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, providing a link to the license, and indicating if changes were made.