Abstract
Stresses close to the weld toes in a dragline cluster were measured for a dragline under service conditions. Hot spot stresses were determined at the weld toes in the cluster using the linear extrapolation method as recommended by existing fatigue design guidelines. A rainflow counting analysis was carried out on the resultant hot spot stress-time histories for strain gauges located in the main chord and the lacing members. Existing fatigue design curves are used to estimate the fatigue life in the main chord and the lacing members using cumulative damage analysis. A comparison of fatigue life estimates from the cumulative damage analysis and average lives observed in the field is used as a basis for rec:ommending a modified method for cumulative damage analysis of the chord members. This investigation focuses on a cluster that is close to the boom foot and in which compressive stresses are significant in service. The findings in this investigation are compared to previous research .
| Original language | English |
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| Title of host publication | Proceedings of the 5th International Conference on Thin-Walled Structures, held in Brisbane, Qld., 18-20 June, 2008 |
| Publisher | Queensland University of Technology |
| Number of pages | 8 |
| ISBN (Print) | 9781741072396 |
| Publication status | Published - 2008 |
| Event | International Conference on Thin-Walled Structures - Duration: 1 Jan 2008 → … |
Conference
| Conference | International Conference on Thin-Walled Structures |
|---|---|
| Period | 1/01/08 → … |
Keywords
- fatigue
- draglines
- strains and stresses