Influence of variations in geometric parameters and an alternative design for improved fatigue life of a mining dragline joint

Joshi, Suraj; Price, John W H; Dayawansa, Daya

doi:10.1016/j.engstruct.2010.01.011

Cited by 10 publications

(4 citation statements)

References 10 publications

(15 reference statements)

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“…[4][5][6][7] The tubular structures studied in this work are mining draglines used in the Australian coal mining industry to move overburden or ore. [8][9][10] These booms are found to undergo very severe and incessant fatigue loading over extended periods of time, which results in significant cracking at the welded connections called clusters. [8][9][10][11][12][13][14] The booms under investigation are made of large circular hollow section (CHS) tubes joined together through a series of complex overlaps and weave welding (Figure 1a). 15 These connections typically consist of a chord member and three-to five-lacing members welded at a co-eccentric centerpoint called a node, so as to form a complex overlapped footprint.…”

Section: Introductionmentioning

confidence: 99%

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

Joshi

Mashiri

Dayawansa

et al. 2010

Structural Health Monitoring

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‘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.

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Section: Introductionmentioning

confidence: 99%

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

Joshi

Mashiri

Dayawansa

et al. 2010

Structural Health Monitoring

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“…The four uncertainty geometric parameters investigated are thickness of sleeve, thicknesses of bracing/lacing members, weld fillet radius and eccentricity [7].…”

Section: Uncertainty Geometric Parametersmentioning

confidence: 99%

“…Welding directly the bracing/lacing members to the main chords created a very rigid solid mass at joint node. Joshi et al [7] stated that if some mobility is allowed on the node, stress concentrations will be reduced significantly.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Mining Dragline Joint: A Sensitivity Analysis With Sobol’s Variance-Based Method

et al. 2016

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A sensitivity analysis is performed to determine the key uncertain geometric parameters that influence the mechanical response of a mining dragline joint subjected to large dynamic loading. An alternative design is modeled where the welded of the lacing members are attached on the sleeve structure rather than welded to the main chord directly using ABAQUS. Based on the simulated values, the Sobol's variance-based method which consists of first-order and total-effect sensitivity indices is presented. The sensitivity of four uncertain geometric parameters on the mechanical responses are investigated; i.e. thickness of sleeve, thickness of bracing members, weld fillet and eccentricity. To conclude, it is observed that the thickness of sleeve is the most dominant uncertain geometric parameter with respect to the specified mechanical responses.

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Towards lateral performance of CBF with unwanted eccentric connection: A finite element modeling approach

Zahrai

Bolandi

2014

KSCE J Civ Eng

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Influence of variations in geometric parameters and an alternative design for improved fatigue life of a mining dragline joint

Cited by 10 publications

References 10 publications

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

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

Modelling of Mining Dragline Joint: A Sensitivity Analysis With Sobol’s Variance-Based Method

Towards lateral performance of CBF with unwanted eccentric connection: A finite element modeling approach

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