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Evaluation of fatigue crack propagation in steel ESET specimens subjected to variable load spectra

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Abstract
This paper reports on an experimental study of fatigue crack growth in steel specimens. First, block loading tests (sequences of low and high stress intensity factor ranges ΔK) are discussed. Limited crack growth retardation occurs at transitions from low to high load ranges; significant retardation or crack arrest are observed in high-low transitions. Next, semi-random load spectra are created, processed using a peak-and-valley analysis and further reduced by removing the load ranges below the stress intensity factor threshold ΔKth. Rainflow counting is performed to obtain load profiles consisting of a sequence of blocks with constant ΔK. For the semi-random and the (reduced) peak-and-valley spectra no significant load interaction is observed. Pronounced crack growth retardation is observed in an ordered spectrum obtained by rainflow counting. The strong reduction in number of cycles of the (reduced) peak-and-valley spectra allows for exploration of accelerated fatigue testing. Experimental results of fatigue crack propagation are compared to results of calculations using a Python based numerical framework.
Keywords
Fatigue, Crack growth, variable amplitude, load sequence, load interaction

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MLA
De Waele, Wim, et al. “Evaluation of Fatigue Crack Propagation in Steel ESET Specimens Subjected to Variable Load Spectra.” 1st Virtual European Conference on Fracture (VECF1), edited by F Lacoviello et al., vol. 28, Elsevier, 2020, pp. 253–65, doi:10.1016/j.prostr.2020.10.031.
APA
De Waele, W., Trogh, S., De Tender, S., Micone, N., & Hectors, K. (2020). Evaluation of fatigue crack propagation in steel ESET specimens subjected to variable load spectra. In F. Lacoviello, A. Sedmak, L. Marsavina, B. Blackman, G. Ferro, V. Shlyannikov, … L. BanksSills (Eds.), 1st Virtual European Conference on Fracture (VECF1) (Vol. 28, pp. 253–265). Online: Elsevier. https://doi.org/10.1016/j.prostr.2020.10.031
Chicago author-date
De Waele, Wim, Sven Trogh, Steven De Tender, Nahuel Micone, and Kris Hectors. 2020. “Evaluation of Fatigue Crack Propagation in Steel ESET Specimens Subjected to Variable Load Spectra.” In 1st Virtual European Conference on Fracture (VECF1), edited by F Lacoviello, A Sedmak, L Marsavina, B Blackman, GA Ferro, V Shlyannikov, P Stahle, et al., 28:253–65. Elsevier. https://doi.org/10.1016/j.prostr.2020.10.031.
Chicago author-date (all authors)
De Waele, Wim, Sven Trogh, Steven De Tender, Nahuel Micone, and Kris Hectors. 2020. “Evaluation of Fatigue Crack Propagation in Steel ESET Specimens Subjected to Variable Load Spectra.” In 1st Virtual European Conference on Fracture (VECF1), ed by. F Lacoviello, A Sedmak, L Marsavina, B Blackman, GA Ferro, V Shlyannikov, P Stahle, Z Zhang, PMGP Moreira, Z Bozic, and L BanksSills, 28:253–265. Elsevier. doi:10.1016/j.prostr.2020.10.031.
Vancouver
1.
De Waele W, Trogh S, De Tender S, Micone N, Hectors K. Evaluation of fatigue crack propagation in steel ESET specimens subjected to variable load spectra. In: Lacoviello F, Sedmak A, Marsavina L, Blackman B, Ferro G, Shlyannikov V, et al., editors. 1st Virtual European Conference on Fracture (VECF1). Elsevier; 2020. p. 253–65.
IEEE
[1]
W. De Waele, S. Trogh, S. De Tender, N. Micone, and K. Hectors, “Evaluation of fatigue crack propagation in steel ESET specimens subjected to variable load spectra,” in 1st Virtual European Conference on Fracture (VECF1), Online, 2020, vol. 28, pp. 253–265.
@inproceedings{8682739,
  abstract     = {{This paper reports on an experimental study of fatigue crack growth in steel specimens. First, block loading tests (sequences of low and high stress intensity factor ranges ΔK) are discussed. Limited crack growth retardation occurs at transitions from low to high load ranges; significant retardation or crack arrest are observed in high-low transitions. Next, semi-random load spectra are created, processed using a peak-and-valley analysis and further reduced by removing the load ranges below the stress intensity factor threshold ΔKth. Rainflow counting is performed to obtain load profiles consisting of a sequence of blocks with constant ΔK. For the semi-random and the (reduced) peak-and-valley spectra no significant load interaction is observed. Pronounced crack growth retardation is observed in an ordered spectrum obtained by rainflow counting. The strong reduction in number of cycles of the (reduced) peak-and-valley spectra allows for exploration of accelerated fatigue testing. Experimental results of fatigue crack propagation are compared to results of calculations using a Python based numerical framework.}},
  author       = {{De Waele, Wim and Trogh, Sven and De Tender, Steven and Micone, Nahuel and Hectors, Kris}},
  booktitle    = {{1st Virtual European Conference on Fracture (VECF1)}},
  editor       = {{Lacoviello, F and Sedmak, A and Marsavina, L and Blackman, B and Ferro, GA and Shlyannikov, V and Stahle, P and Zhang, Z and Moreira, PMGP and Bozic, Z and BanksSills, L}},
  issn         = {{2452-3216}},
  keywords     = {{Fatigue,Crack growth,variable amplitude,load sequence,load interaction}},
  language     = {{eng}},
  location     = {{Online}},
  pages        = {{253--265}},
  publisher    = {{Elsevier}},
  title        = {{Evaluation of fatigue crack propagation in steel ESET specimens subjected to variable load spectra}},
  url          = {{http://dx.doi.org/10.1016/j.prostr.2020.10.031}},
  volume       = {{28}},
  year         = {{2020}},
}

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