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Uncertainty in fatigue life prediction of structures subject to Gaussian loads

Bengtsson, Anders LU and Rychlik, Igor LU (2009) In Probabilistic Engineering Mechanics 24(2). p.224-235
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Damage intensity approximations, Pierson-Moskowitz spectrum, Seasonal loads, Fatigue, Safety index
in
Probabilistic Engineering Mechanics
volume
24
issue
2
pages
224 - 235
publisher
Elsevier
external identifiers
  • wos:000263652400012
  • scopus:58549085183
ISSN
0266-8920
DOI
10.1016/j.probengmech.2008.06.004
language
English
LU publication?
yes
id
56a9d53c-6153-493c-a09d-fac28b10ac16 (old id 1372072)
date added to LUP
2009-05-08 17:22:33
date last changed
2017-12-03 03:17:39
@article{56a9d53c-6153-493c-a09d-fac28b10ac16,
  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.},
  author       = {Bengtsson, Anders and Rychlik, Igor},
  issn         = {0266-8920},
  keyword      = {Damage intensity approximations,Pierson-Moskowitz spectrum,Seasonal loads,Fatigue,Safety index},
  language     = {eng},
  number       = {2},
  pages        = {224--235},
  publisher    = {Elsevier},
  series       = {Probabilistic Engineering Mechanics},
  title        = {Uncertainty in fatigue life prediction of structures subject to Gaussian loads},
  url          = {http://dx.doi.org/10.1016/j.probengmech.2008.06.004},
  volume       = {24},
  year         = {2009},
}