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Identification and prediction of mixed-mode fatigue crack path in high strength low Alloy steel

Jie Zhang (UGent) , Cedric Kiekens, Stijn Hertelé (UGent) and Wim De Waele (UGent)
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Abstract
The trajectory of fatigue crack growth is influenced by many parameters and can be irregular due to changes in stress distribution or in material properties as the crack progresses. Images of the surface of a standardized test specimen can be used to visualize the crack trajectory in a non-destructive way. Accurately identifying the location of the crack tip, however, is challenging and requires devoted image postprocessing. In this respect, digital image correlation allows to obtain full field displacement and strain fields by analysing changes of digital images of the same sample at different stages of loading. This information can be used for the purpose of crack tip tracking. This paper presents a combined experimental-numerical study of detection and prediction of fatigue crack propagation path by means of digital image correlation (DIC) and the extended finite element method (X-FEM). Experimental validation and analyses are carried out on a modified C(T) specimen in which a curved crack trajectory is triggered by introducing mixed-mode (tension + shear) loading. The developed tools are used for validating an automated framework for crack propagation prediction.
Keywords
fatigue crack propagation, digital image correlation, X-FEM, crack tip

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Chicago
Zhang, Jie, Cedric Kiekens, Stijn Hertelé, and Wim De Waele. 2018. “Identification and Prediction of Mixed-mode Fatigue Crack Path in High Strength Low Alloy Steel.” In Proceedings of The 18th International Conference on Experimental Mechanics , ed. Danny Van Hemelrijck, Dimitrios Aggelis, Nele De Belie, Fabienne Delaunois, Thomas Geernaerts, Patrick Guillaume, Anne Habraken, et al. Vol. 2. mdpi.
APA
Zhang, Jie, Kiekens, C., Hertelé, S., & De Waele, W. (2018). Identification and prediction of mixed-mode fatigue crack path in high strength low Alloy steel. In D. Van Hemelrijck, D. Aggelis, N. De Belie, F. Delaunois, T. Geernaerts, P. Guillaume, A. Habraken, et al. (Eds.), Proceedings of The 18th International Conference on Experimental Mechanics (Vol. 2). Presented at the The 18th International Conference on Experimental Mechanics (ICEM 2018), mdpi.
Vancouver
1.
Zhang J, Kiekens C, Hertelé S, De Waele W. Identification and prediction of mixed-mode fatigue crack path in high strength low Alloy steel. In: Van Hemelrijck D, Aggelis D, De Belie N, Delaunois F, Geernaerts T, Guillaume P, et al., editors. Proceedings of The 18th International Conference on Experimental Mechanics . mdpi; 2018.
MLA
Zhang, Jie, Cedric Kiekens, Stijn Hertelé, et al. “Identification and Prediction of Mixed-mode Fatigue Crack Path in High Strength Low Alloy Steel.” Proceedings of The 18th International Conference on Experimental Mechanics . Ed. Danny Van Hemelrijck et al. Vol. 2. mdpi, 2018. Print.
@inproceedings{8579022,
  abstract     = {The trajectory of fatigue crack growth is influenced by many parameters and can be irregular due to changes in stress distribution or in material properties as the crack progresses. Images of the surface of a standardized test specimen can be used to visualize the crack trajectory in a non-destructive way. Accurately identifying the location of the crack tip, however, is challenging and requires devoted image postprocessing. In this respect, digital image correlation allows to obtain full field displacement and strain fields by analysing changes of digital images of the same sample at different stages of loading. This information can be used for the purpose of crack tip tracking. This paper presents a combined experimental-numerical study of detection and prediction of fatigue crack propagation path by means of digital image correlation (DIC) and the extended finite element method (X-FEM). Experimental validation and analyses are carried out on a modified C(T) specimen in which a curved crack trajectory is triggered by introducing mixed-mode (tension + shear) loading. The developed tools are used for validating an automated framework for crack propagation prediction.},
  author       = {Zhang, Jie and Kiekens, Cedric and Hertel{\'e}, Stijn and De Waele, Wim},
  booktitle    = {Proceedings of The 18th International Conference on Experimental Mechanics },
  editor       = { Van Hemelrijck, Danny and Aggelis, Dimitrios and De Belie, Nele and Delaunois, Fabienne  and Geernaerts, Thomas and Guillaume,  Patrick  and Habraken, Anne  and Hendrick, Patrick  and Reynders, Edwin  and Simar, Aude and Vanlanduit, Steve},
  issn         = {2504-3900},
  language     = {eng},
  location     = {Brussels, Belgium},
  pages        = {6},
  publisher    = {mdpi},
  title        = {Identification and prediction of mixed-mode fatigue crack path in high strength low Alloy steel},
  url          = {http://dx.doi.org/10.3390/ICEM18-05420},
  volume       = {2},
  year         = {2018},
}

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