Extraction of fatigue damaging events from road spectrum loadings using the wavelet-based fatigue data editing algorithm

Research output: Contribution to journalArticle

Abstract

This paper describes a technique to identify the important features in fatigue road spectrum loading, for which these features cause the majority of the total damage. Fatigue damaging events, called bump segments, are extracted from the spectrum loading using a waveletbased algorithm, called Wavelet Bump Extraction (WBE). This algorithm is also used to produce a shortened mission signal that retains most of the fatigue damage whilst preserving the cycle sequences. The bump identification process has been evaluated by analysing two road spectrum loadings having a variable amplitude pattern. These data sets were obtained from the strain measurement on the lower suspension of different vehicles travelling over different road surfaces. In this study the total fatigue life caused by the combination of all bump events was close to the original data sets. For this case, the fatigue life of the original spectrum loading and the WBE extracted loadings are predicted using three strain-life fatigue damage models, i.e. the Coffin-Manson relationship, the Morrow and the Smith-WatsonTopper (SWT) mean stress correction effects. In addition, the correlation analysis showed that the coefficient of variation (R2) between the fatigue lives of the original and the total of bump segments was found to be 99.9% or 0.999. These findings suggested that WBE is a suitable approach for mission synthesis applications by producing a shortened mission signal for accelerated fatigue test.

Original languageEnglish
Pages (from-to)181-197
Number of pages17
JournalSDHM Structural Durability and Health Monitoring
Volume4
Issue number4
Publication statusPublished - 2008

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Fatigue of materials
Fatigue damage
Strain measurement

Keywords

  • Extraction
  • Fatigue damaging events
  • Fatigue life
  • Spectrum loading
  • WBE

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

Cite this

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abstract = "This paper describes a technique to identify the important features in fatigue road spectrum loading, for which these features cause the majority of the total damage. Fatigue damaging events, called bump segments, are extracted from the spectrum loading using a waveletbased algorithm, called Wavelet Bump Extraction (WBE). This algorithm is also used to produce a shortened mission signal that retains most of the fatigue damage whilst preserving the cycle sequences. The bump identification process has been evaluated by analysing two road spectrum loadings having a variable amplitude pattern. These data sets were obtained from the strain measurement on the lower suspension of different vehicles travelling over different road surfaces. In this study the total fatigue life caused by the combination of all bump events was close to the original data sets. For this case, the fatigue life of the original spectrum loading and the WBE extracted loadings are predicted using three strain-life fatigue damage models, i.e. the Coffin-Manson relationship, the Morrow and the Smith-WatsonTopper (SWT) mean stress correction effects. In addition, the correlation analysis showed that the coefficient of variation (R2) between the fatigue lives of the original and the total of bump segments was found to be 99.9{\%} or 0.999. These findings suggested that WBE is a suitable approach for mission synthesis applications by producing a shortened mission signal for accelerated fatigue test.",
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