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Probabilistic Fatigue Assessment of a Notched Detail Taking Into Account Mean Stress Effects

[+] Author Affiliations
Abílio M. P. De Jesus, Norberto J. Gonçalves

University of Trás-os-Montes and Alto Douro, Vila Real, Portugal

M. Luisa Ruiz Ripoll

Delft University of Technology, Delft, The Netherlands

Hélder F. S. G. Pereira

UCVE, IDMEC – Pólo FEUP, Porto, Portugal

Paper No. PVP2010-25056, pp. 51-60; 10 pages
doi:10.1115/PVP2010-25056
From:
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-49255 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME

abstract

Probabilistic fatigue models are required to account conveniently for the several sources of uncertainty arising in the prediction procedures, such as the scatter in material behavior. In this paper, a recently proposed stress-based probabilistic model is assessed using fatigue data available for the P355NL1 steel (a pressure vessel steel). The referred probabilistic model is a log-Gumbel regression model, able to predict the probabilistic Wöhler field (P-S-N field), taking into account the mean stress (or stress R-ratio) effects. The parameters of the probabilistic model are identified using stress-life data derived for the P355NL1 steel, from smooth specimens, for three distinct stress R-ratios, namely R = −1, R = −0.5 and R = 0. The model requires a minimum of two test series with distinct stress R-ratios. Since data from three test series is available, extrapolations are performed to test the adequacy of the model to make extrapolations for stress R-ratios other than those used in the model parameters assessment. Finally, the probabilistic model is used to model the fatigue behavior of a notched plate made of P355NL1 steel. In particular, the P-S-N field of the plate is modeled and compared with available experimental data. Cyclic elastoplastic analysis of the plate is performed since plasticity at the notch root is developed.

Copyright © 2010 by ASME
Topics: Fatigue , Stress

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