Uncertainty in fatigue life prediction of structures subject to Gaussian loads

Anders Bengtsson, Igor Rychlik

Research output: Contribution to journalArticlepeer-review

43 Citations (SciVal)

Abstract

In this paper we shall concentrate on Gaussian (or close to Gaussian) loads acting on a structure. The goal is to compute a measure of risk for fatigue of a component during a specific time period and the so called "safety index" will be used to combine different types of uncertainties. The presented methodology can be applied in a more general situation of environmental loads which properties may vary with time of the year. The load is assumed to be "locally" stationary such that the mean load is constant (and taken to be zero) but the variance of the load can change slowly with time. Non-stationary hierarchical processes, separable into a stationary Gaussian process and a process describing the load amplitude and period, e.g. processes with Pierson-Moskowitz or JONSWAP spectrum, are treated in detail. The variability of a load, relevant for the fatigue accumulation process, will be described by means of rainflow cycles counted in the load. Moreover, common damage intensity approximations are reviewed and evaluated in a simulation study. (C) 2008 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)224-235
JournalProbabilistic Engineering Mechanics
Volume24
Issue number2
DOIs
Publication statusPublished - 2009

Subject classification (UKÄ)

  • Probability Theory and Statistics

Keywords

  • Damage intensity approximations
  • Pierson-Moskowitz spectrum
  • Seasonal loads
  • Fatigue
  • Safety index

Fingerprint

Dive into the research topics of 'Uncertainty in fatigue life prediction of structures subject to Gaussian loads'. Together they form a unique fingerprint.

Cite this