Numerical simulations of fatigue crack initiation and propagation based on re-tensile plastic zone generating load criterion for in-plane gusset welded joints

Nagata, Yukinobu; Gotoh, Koji; Toyosada, Masahiro

doi:10.1007/s00773-009-0044-7

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…The results revealed that the aspect ratio evolution of a surface crack under biaxial loading is the same as that under uniaxial loading. Subsequently, fatigue crack propagation analysis was carried out using a method for converting the biaxial stress to equivalent uniaxial stress, and the previously proposed EDS method [9][10][11][12][13]. This approach was validated for all cases through a comparison between the estimated and measured fatigue crack propagation histories.…”

Section: Discussionmentioning

confidence: 99%

“…• Verify the effect of weld residual stress on the aspect ratio evolution of a surface crack at a welded joint. • Verify the proposed method [9][10][11][12][13] for the case wherein each stress wave component with a direction perpendicular and horizontal to the crack surface is a superimposed stress wave containing multiple frequency components. • Investigate the stress biaxiality effect on the fatigue crack growth inclined with respect to the loading axis.…”

Section: Discussionmentioning

confidence: 99%

“…The numerical simulation of the surface crack propagation history was performed using the proposed method to convert the equivalent uniaxial loading [9], while the equivalent distributed stress (EDS) method [10] was used to convert the surface crack problem to a through-thickness crack problem. Examples demonstrating the validity of this method under uniaxial cyclic loading have been reported in the literature [11][12][13].…”

Section: Introductionmentioning

confidence: 88%

“…Hence, it is concluded that the proposed numerical simulation method [9][10][11][12][13] can provide a fair, or at least safe, side estimation result. There are various factors that could cause the difference between estimation and experimental result, including the followings.…”

Section: Fatigue Crack Propagation Analysismentioning

confidence: 99%

“…Fig 11. Applied biaxial stress and equivalent uniaxial stress waveform of out-of-plane gusset-welded joint specimens…”

mentioning

confidence: 99%

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Fatigue surface crack growth behavior in flat plate and out-of-plane gusset-welded joints under biaxial cyclic loads with different phases

et al. 2020

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Although many in-service welded built-up structures, which contain many welded joints as fatigue crack initiation sites, are subjected to many types of loading, their structural integrities are evaluated according to design codes based on theoretical and experimental investigations under uniaxial loading conditions. Additionally, most of these codes implement the S-N curves approach. This study highlights the biaxial cyclic loading with different phases. The fracture mechanics approach toward fatigue life evaluation can obtain the fatigue crack growth history. This paper confirms the applicability of the previously proposed numerical simulation method for obtaining the fatigue crack propagation histories of a cracked plate subjected to biaxial loads with a phase difference for each loading component. A fracture mechanic approach was used to establish the proposed method. The fatigue surface crack growth behavior of a flat plate and an out-of-plane gusset-welded joint under biaxial cyclic loadings with different phases was investigated by extending the applicability of the proposed method to a through-thickness crack. Comparisons between the measured crack evolution and the numerical simulation results were carried out to validate our fatigue crack growth simulation for flat plane and welded joints.

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