Numerical analysis of low cycle fatigue for welded joints considering welding residual stress and plastic damage under combined bending and local compressive loads

Wang, Xiaojia; Meng, Qingguo; Hu, Wenjing

doi:10.1111/ffe.13216

Cited by 12 publications

(12 citation statements)

References 39 publications

(79 reference statements)

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“…With the development of finite element technology, finite element software has shown great potential. ABAQUS is commonly applied with the advantage of obtaining the residual stress field and adding the residual stress field in subsequent calculations [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Liu

Kouadri-Henni

Malard

2022

KEM

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Laser-welded structures are often subjected to dynamic service loads ranging from cyclic fluctuations to completely random ones. The laser-welded lap joints suffer from defects resulting in notch effects, surface cracks, residual strains and stresses. The fatigue strength of the laser-welded lap joints is reduced significantly because of the presence of these defects, and the size of the welded joints is small. Therefore, the mechanical strength of laser-welded structures must be defined in terms of the fatigue strength and residual stress of the obtained joints or assemblies. To analyze the above-discussed effects, this paper proposed two approaches: numerical and experimental methods. The originality of the work is to weld the rolled sheet in three directions (0°, 45°, 90°). The residual stresses before and after low cyclic tensile tests of assemblies obtained from overlapped thin DP600 steel sheets were calculated by ABAQUS. The obtained results were compared to the experimental data by neutron diffraction. The presented results in terms of residual stresses curves, spatial distributions of residual stresses obtained at the end of laser welding and low-cycle fatigue. It showed the relaxation effect of residual stresses and the direction effect of welding. These results have been explained by several factors.

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Section: Introductionmentioning

confidence: 99%

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Liu

Kouadri-Henni

Malard

2022

KEM

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“…Welding residual stress (RS) affects fatigue behavior and service life of welded components 1–3 . Quantitatively characterizing RS during fatigue is very significant for reliability assessment but is extremely difficult due to its inevitable variation 4–6 …”

Section: Introductionmentioning

confidence: 99%

Real‐time measurement of welding residual stress relaxation based on strain‐controlled fatigue test

Zhang

Luan

2022

Fatigue Fract Eng Mat Struct

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Fatigue-induced variation of residual stress (RS) in welded joints is inevitable and has significant influence on fatigue behavior. The widely used technologies (e.g., X-ray diffraction) can only test surface RS of specimen at unloading or certain holding load condition. In this study, an approach of measuring equivalent RS in real time during fatigue cycling is proposed based on straincontrolled fatigue with strain ratio of À1. Under applied waveform starting with tensile strain, tensile RS in a welded joint continuously relaxes with fatigue cycles, but compressive RS first increases then relaxes. Both tensile and compressive RSs rapidly change in the first few cycles and then gradually relax to a steady state in which accumulated plastic strain is linearly correlated to amount of RS relaxation during fatigue cycling.

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“…When steel structures are subjected to cyclic loads such as earthquakes, wind, or running vehicle/ machine-induced actions, the welded joints are vulnerable to fatigue failure. 1,2 In several cases, the structural components are merely under a simple cyclic load and the welded joints mainly suffer from uniaxial fatigue damage. However, time-varying loads from multiple directions may cause the connected joints to be at risk of multiaxial fatigue failure.…”

Section: Introductionmentioning

confidence: 99%

“…Welding is a widely used connection method for steel structures. When steel structures are subjected to cyclic loads such as earthquakes, wind, or running vehicle/machine‐induced actions, the welded joints are vulnerable to fatigue failure 1,2 . In several cases, the structural components are merely under a simple cyclic load and the welded joints mainly suffer from uniaxial fatigue damage.…”

Section: Introductionmentioning

confidence: 99%

Path‐dependent multiaxial fatigue prediction of welded joints using structural strain method

Han

Wang

2021

Fatigue Fract Eng Mat Struct

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The maximum shear strain's rotational conditions are investigated under multiaxial loading. The additional hardening is closely related to the relative value, rotational range, and gradual or severe rotation way of the maximum shear strain change. A novel path‐dependent loading factor is introduced to account for the nonproportional additional hardening effect. Subsequently, a computational formula of the structural strain method is established for the multiaxial loading state. The structural stress/strain terms and the proposed path‐dependent factor are introduced into the existing energy‐based fatigue parameter based on the critical plane model. The proposed fatigue prediction method provides prediction results showing that more than 68% and 87% of the data are within the scatter bands of 3 and 5, respectively, for the selected tube–flange/tube welded joints under multiaxial loading paths.

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Numerical analysis of low cycle fatigue for welded joints considering welding residual stress and plastic damage under combined bending and local compressive loads

Cited by 12 publications

References 39 publications

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Real‐time measurement of welding residual stress relaxation based on strain‐controlled fatigue test

Path‐dependent multiaxial fatigue prediction of welded joints using structural strain method

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