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Uncertainty in fatigue life prediction of structures subject to Gaussian loads

Författare och institution:
Anders Bengtsson (-); Igor Rychlik (Institutionen för matematiska vetenskaper, matematisk statistik, Chalmers/GU)
Publicerad i:
Probabilistic Engineering Mechanics, 24 ( 2 ) s. 224-235
ISSN:
0266-8920
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2009
Språk:
engelska
Fulltextlänk:
Sammanfattning (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. © 2008 Elsevier Ltd. All rights reserved.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Matematik ->
Beräkningsmatematik ->
Tillämpad matematik
NATURVETENSKAP ->
Matematik ->
Sannolikhetsteori och statistik ->
Matematisk statistik
Nyckelord:
Damage intensity approximations; Fatigue; Pierson-Moskowitz spectrum; Safety index; Seasonal loads
Postens nummer:
106667
Posten skapad:
2010-01-12 14:56
Posten ändrad:
2016-07-25 09:21

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