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Design of Welded Thick-walled Tubular Dragline Joints Using 2D Effective Notch Stress Method
N. L. Pang,X. L. Zhao,F. R. Mashiri,P. Dayawansa,J. W. H. Price 한국강구조학회 2006 International Journal of Steel Structures Vol.6 No.4
The tubular booms of draglines used in the coal mining industry are subjected to fatigue loading. Fatigue cracks may occurat either weld toe or weld root of the dragline joints. This paper acts as the first attempt to use the effective notch stress (ENS)method to design such joints. Only simplified 2D finite element analysis (FEA) was carried out at this stage. Two diferentcompared with those for other 2D welded details. The fatigue design classes were determined based on the NSF.
Fatigue Behavior of Welded Thin-Walled T-joints between Circular and Square Hollow Secitons
Le-Wei Tong,X.L. Zhao,F.R.Mashiri,P.Grundy,Hong-Zhi Zheng 한국강구조학회 2006 International Journal of Steel Structures Vol.6 No.3
The fatigue behaviour of thin-walled CHS-to-SHS T-joints (t < 4 m) under in-plane bending are studied in this paper. Thefailure modes observed in the fatigue tests are described. Surface crack growth was recorded at progressive stages of fatiguelife, from initiation, through-thickness life and end of test failure. The characteristics of fatigue crack initiation and propagationare described. The stress concentration factors (SCFs) along the weld toes at both the circular brace and the square chord are-dimensional joint parameters on SCFs are discussed. The resultant SCFs are compared to both the SCFs from CHS and RHSparametric formulae in IIW guidelines. Both the fatigue tests and FE analyses showed that the hot spot locations of the CHS-to-SHS T-joints were located at the weld toe of the square hollow section chord.