Fatigue assessment of large-size welded joints based on the effective notch stress approach

Park, Wooryong; Miki, Chitoshi

doi:10.1016/j.ijfatigue.2007.11.012

Cited by 40 publications

(15 citation statements)

References 10 publications

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“…The single S–N curve for the ENSC, on the other hand, provides a robust, uniform basis for the fatigue design and assessment of various types of welded joints. Recent experimental investigations on small‐scale and large‐scale specimens have verified the accuracy of the effective notch stress S–N curve for various welded steel joints. Other research activities have also extended ENSC for fatigue assessment of joints with pronounced weld termination region, at which the critical notch stress normally locates.…”

Section: Introductionmentioning

confidence: 87%

“…The single S-N curve for the ENSC, on the other hand, provides a robust, uniform basis for the fatigue design and assessment of various types of welded joints. Recent experimental investigations on small-scale and large-scale specimens [6][7][8][9][10] have verified the accuracy of the effective notch stress S-N curve for various welded steel joints.…”

mentioning

confidence: 87%

“…For the tube-to-plate joints, in addition to the member thicknesses, C also depends on the diameter of the tube member. This study proposes Eqs (7) and (8) to estimate the C value for cruciform and tube-to-plate joints, respectively. (5) The estimated notch stresses based on the extrapolation method are generally in close agreement with those calculated using the 1 mm notch radius.…”

Section: S U M M a R Y A N D C O N C L U S I O N Smentioning

confidence: 99%

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An extrapolation method to determine the effective notch stress in welded joints

Pradana

Qian

Swaddiwudhipong

2015

Fatigue Fract Eng Mat Struct

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This paper presents the development of an extrapolation method to estimate the notch stress in welded steel joints, in line with the effective notch stress concept described in the International Institute of Welding guideline. The proposed approach provides a convenient method to determine the local notch stress at the weld toes without the need to model a finite notch radius as required in engineering guidelines, which creates significant modeling challenges in the numerical procedure, especially for 3‐D joints with a complex topology. An experimental study validates the feasibility of this extrapolation method through strain measurements on cruciform joints. The numerical study then investigates two types of welded connections: (1) cruciform joints with full‐penetration welds and (2) tube‐to‐plate joints. The proposed extrapolation method provides accurate effective notch stress estimations on both joint types, compared with the effective notch stress calculated following the mesh requirement in the existing guidelines.

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Section: Introductionmentioning

confidence: 87%

mentioning

confidence: 87%

Section: S U M M a R Y A N D C O N C L U S I O N Smentioning

confidence: 99%

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An extrapolation method to determine the effective notch stress in welded joints

Pradana

Qian

Swaddiwudhipong

2015

Fatigue Fract Eng Mat Struct

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“…The research results indicated that the fatigue strength of copehole details was extremely low because of the local stress around the cope holes. Park et al [3] explored the applicability of the effective notch stress approach to fatigue assessment of cruciform joints, considering fatigue crack initiation points, stress distributions and fatigue strengths. Aygül et al [4] evaluated the application of the structural hot spot stress approach and the effective notch stress approach to a welded joint with cutout holes in orthotropic bridge decks.…”

Section: Introductionmentioning

confidence: 99%

Stress concentration coefficients of optimized cope-hole welded detail

et al. 2017

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The fatigue performance of optimized welded detail has been investigated by fatigue experiments of three welded specimens under different loadings. In addition, local finite element models of this welded detail were established using finite element software ANSYS. The influences of different factors such as plate thickness, plate gap and initial geometric imperfections on the stress concentration coefficient (SCC) were discussed. The experimental results indicate that the fatigue life of three specimens for this welded detail is 736,000, 1,044,200 and 1,920,300 times, respectively. The web thickness, the filler plate thickness and the initial geometric imperfection have relatively less effect on the SCCs of this welded detail. However, cope-hole radius is influential on the SCCs of the web and the weld. The SCC of weld is significantly affected by the weld size and plate gap, but the SCCs of other parts of the welded detail are hardly affected by the plate gap.

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“…Fatigue tests of full‐scale orthotropic steel decks were conducted by Sim and Uang, and the effective notch stress approach was adopted to estimate the fatigue behaviour of trough rib‐to‐deck welded joints. Besides, the applicability of the effective notch stress approach to large size specimens for cruciform joints, diaphragm joints and out‐of‐plane gusset joints was investigated by Park and Miki …”

Section: Introductionmentioning

confidence: 99%

Fatigue crack initiation prediction of cope hole details in orthotropic steel deck using the theory of critical distances

Zhou

Wen

Wang

et al. 2016

Fatigue Fract Eng Mat Struct

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Orthotropic steel decks are vulnerable to fatigue cracking in welded connections and complex geometrical details. A total of three fatigue tests were conducted on segments of orthotropic steel deck to evaluate the fatigue performance of trough‐to‐crossbeam connections with various cut‐out configurations. In the tests, the specimens were subjected to cyclic three‐point bending load and the fatigue cracks were more likely to initiate from the cope holes in the crossbeam web rather than the trough‐to‐crossbeam fillet welds. Three‐dimensional finite element models (FEM) of the specimens were built and validated by the measured deflections and stresses. Using the validated FEM, the characteristic stresses based on the theory of critical distances (TCD) were calculated for the stress concentrations along the cope holes. The fatigue crack initiation life, predicted by the TCD‐based stress combined with the plain material S–N curve, agreed reasonably with the fatigue test results. The TCD method could further form a basis of fatigue crack propagation analysis using the fracture mechanics approaches.

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Fatigue assessment of large-size welded joints based on the effective notch stress approach

Cited by 40 publications

References 10 publications

An extrapolation method to determine the effective notch stress in welded joints

An extrapolation method to determine the effective notch stress in welded joints

Stress concentration coefficients of optimized cope-hole welded detail

Fatigue crack initiation prediction of cope hole details in orthotropic steel deck using the theory of critical distances

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