Structural health monitoring of a dragline cluster using the hot spot stress method

Suraj Joshi, Fidelis R. Mashiri, Daya P. Dayawansa, Xiao-Ling Zhao, John W. H. Price

    Research output: Contribution to journalArticle

    Abstract

    Hot spot stress' is an approach often used to consider fatigue loadings in heavily welded tubular joints. This article reports the determination of hot spot stresses in mining dragline booms, which are often ≥100 m in length, using strain gage measurements and finite element analysis (FEA) modeling as part of a structural health monitoring concept. Strain gages were installed on a typical A11 cluster for estimating hot spot stresses, as recommended in the existing fatigue design guidelines by the International Institute of Welding (IIW) and the International Committee for the Development and Study of Tubular Construction (CIDECT). The results from the experimental measurements and the FEA were found to be comparable to a large measure. It was concluded that while hot spot stresses were high enough at the weld toes to cause cracking, they could not explain the cracking that occurs at the welds in the main chords on their own. Issues in comparing theoretical and experimental measurements are discussed.
    Original languageEnglish
    Number of pages15
    JournalStructural Health Monitoring
    DOIs
    Publication statusPublished - 2011

    Open Access - Access Right Statement

    © 2010 The Authors

    Keywords

    • cracking
    • draglines
    • fatigue
    • finite element method
    • hot spot stresses
    • strain gages
    • strains and stresses
    • welded clusters

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