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Effects of variable amplitude loading on fatigue life

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Abstract
This paper is a review of published research on variable amplitude loading of steels. The use of service spectra for different industrial sectors and specifically for offshore applications is first considered. Constant amplitude fatigue failure models are not representative for these applications. The JONSWAP spectrum shows potential to be used as service spectrum for offshore structures. Further investigation of variable amplitude fatigue is needed to get insight in the various phenomena linked to the variable amplitude. Observed trends in fatigue crack growth rate in variable amplitude fatigue tests on steels, such as the effects of overloads and underloads (occurring as single events, sequential events or block loadings), are discussed. Furthermore, suggestions of the underlying physical phenomena behind the load interaction effects due to variable amplitude loading are presented. It can be concluded that the plasticity induced crack closure mechanism is the most profound explanation for the acceleration effect in overloads and the retardation effect observed in underloads.

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Chicago
Laseure, Niels, Ingmar Schepens, Nahuel Micone, and W De Waele. 2015. “Effects of Variable Amplitude Loading on Fatigue Life.” Ed. Stijn Hertelé and Jeroen Van Wittenberghe. Sustainable Construction and Design 6 (3).
APA
Laseure, N., Schepens, I., Micone, N., & De Waele, W. (2015). Effects of variable amplitude loading on fatigue life. (S. Hertelé & J. Van Wittenberghe, Eds.)SUSTAINABLE CONSTRUCTION AND DESIGN, 6(3).
Vancouver
1.
Laseure N, Schepens I, Micone N, De Waele W. Effects of variable amplitude loading on fatigue life. Hertelé S, Van Wittenberghe J, editors. SUSTAINABLE CONSTRUCTION AND DESIGN. Ghent, Belgium: Ghent University, Laboratory Soete; 2015;6(3).
MLA
Laseure, Niels, Ingmar Schepens, Nahuel Micone, et al. “Effects of Variable Amplitude Loading on Fatigue Life.” Ed. Stijn Hertelé & Jeroen Van Wittenberghe. SUSTAINABLE CONSTRUCTION AND DESIGN 6.3 (2015): n. pag. Print.
@article{7011085,
  abstract     = {This paper is a review of published research on variable amplitude loading of steels. The use of service spectra for different industrial sectors and specifically for offshore applications is first considered.
Constant amplitude fatigue failure models are not representative for these applications. The JONSWAP spectrum shows potential to be used as service spectrum for offshore structures. Further investigation of
variable amplitude fatigue is needed to get insight in the various phenomena linked to the variable
amplitude. Observed trends in fatigue crack growth rate in variable amplitude fatigue tests on steels, such as the effects of overloads and underloads (occurring as single events, sequential events or block loadings), are discussed. Furthermore, suggestions of the underlying physical phenomena behind the load interaction effects due to variable amplitude loading are presented. It can be concluded that the plasticity
induced crack closure mechanism is the most profound explanation for the acceleration effect in overloads and the retardation effect observed in underloads.},
  author       = {Laseure, Niels and Schepens, Ingmar and Micone, Nahuel and De Waele, W},
  editor       = {Hertel{\'e}, Stijn and Van Wittenberghe, Jeroen},
  issn         = {2032-7471},
  journal      = {SUSTAINABLE CONSTRUCTION AND DESIGN},
  language     = {eng},
  number       = {3},
  pages        = {10},
  publisher    = {Ghent University, Laboratory Soete},
  title        = {Effects of variable amplitude loading on fatigue life},
  url          = {http://ojs.ugent.be/SCAD/article/view/1131},
  volume       = {6},
  year         = {2015},
}