On the mechanism of residual stresses relaxation in welded joints under cyclic loading

Wang, Qiang; Liu, Xuesong; Yan, Zhongjie; Dong, Zuomin; Yan, Dejun

doi:10.1016/j.ijfatigue.2017.08.016

Cited by 30 publications

(16 citation statements)

References 37 publications

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“…The presence of compressive residual stress in GNG layer implies that it is in a state of compressive residual strain [21][22][23]. When the sample is deformed in tension during fatigue tests, the residual compressive stress in GNG layer will counteract part of stress increment, thus resulting in a decreased σ max of GNG/CG Cu, relative to the counterparts without any residual stresses.…”

Section: Resultsmentioning

confidence: 99%

Residual stress induced tension-compression asymmetry of gradient nanograined copper

Long

Pan

Tao

et al. 2018

Materials Research Letters

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The residual stress significantly influences the cyclic stress response of the hierarchical nanostructured materials. An obvious tension-compression asymmetry with minimum stress in compression larger than maximum stress in tension was observed in gradient nanograined (GNG) Cu under straincontrolled high-cycle fatigue tests, which gradually diminished with increasing cycles or after being annealed at a low temperature. The observed asymmetric response is primarily induced by the presence of the residual compressive stress in the GNG surface layer. The longer fatigue life can be achieved in GNG Cu with a higher residual stress, compared to that of annealed GNG Cu. IMPACT STATEMENT Obvious tension-compression asymmetry was observed in cyclically deformed gradient nanograined Cu under strain control, caused by the residual compressive stress in the GNG surface layer.

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Section: Resultsmentioning

confidence: 99%

Residual stress induced tension-compression asymmetry of gradient nanograined copper

Long

Pan

Tao

et al. 2018

Materials Research Letters

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“…An analytical model validated using measurements, has been proposed to estimate the relaxation (Xie et al, 2017). Redistribution is cyclic loading & response magnitude and -ratio dependent (Wang et al, 2017a). Adopting non-linear continuum damage mechanics, the high-cycle fatigue consequences has been investigated for a welded T-joint.…”

Section: Mean-and Residual Stressmentioning

confidence: 99%

Report of Committee III.2: Fatigue and fracture

2015

Ships and Offshore Structures XIX

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“…However, tensile residual stresses play a detrimental role on the fatigue performance of structures because of the superimposition of the tensile and cyclic stresses . Moreover, the residual stresses were reported to diminish considerably after the first or initial few loading cycles . Wang et al who indicated that the plastic strain in the same direction as the cyclic loading, played a decisive role on residual stress relaxation.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the residual stresses were reported to diminish considerably after the first or initial few loading cycles . Wang et al who indicated that the plastic strain in the same direction as the cyclic loading, played a decisive role on residual stress relaxation. Other studies also confirmed that the accumulation of plastic strain resulted in the relaxation of welding residual stress during cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life prediction for butt‐welded joints considering weld‐induced residual stresses and initial damage, relaxation of residual stress, and elasto‐plastic fatigue damage

Wang

Meng

2019

Fatigue Fract Eng Mat Struct

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Fatigue damage of butt‐welded joints is investigated by a damage mechanics method. First, the weld‐induced residual stresses are determined by using a sequentially coupled thermo‐mechanical finite element analysis. The plastic damage of material is then calculated with the use of Lemaitre's plastic damage model. Second, during the subsequent fatigue damage analysis, the residual stresses are superimposed on the fatigue loading, and the weld‐induced plastic damage is considered as the initial damage via an elasto‐plastic fatigue damage model. Finally, the fatigue damage evolution, the relaxation of residual stress, and the fatigue lives of the joints are evaluated using a numerical implementation. The predicted results agree well with the experimental data.

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On the mechanism of residual stresses relaxation in welded joints under cyclic loading

Cited by 30 publications

References 37 publications

Residual stress induced tension-compression asymmetry of gradient nanograined copper

Residual stress induced tension-compression asymmetry of gradient nanograined copper

Report of Committee III.2: Fatigue and fracture

Fatigue life prediction for butt‐welded joints considering weld‐induced residual stresses and initial damage, relaxation of residual stress, and elasto‐plastic fatigue damage

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