Fatigue damage evolution and lifetime prediction of welded joints with the consideration of residual stresses and porosity

Shen, Fei; Zhao, Bo; Li, Lin; Chua, Chee Kai; Zhou, Kun

doi:10.1016/j.ijfatigue.2017.06.014

Cited by 80 publications

(40 citation statements)

References 40 publications

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“…The in uence of residual stress on fatigue performance depends on the applied stress ratio [24,25]. The initial residual stress tends to relax during the cycle loading process, and the extent of relaxation depends on plastic strain caused by the increasing applied load, and if the applied tensile mean stress is high enough, the effect of the residual tensile stresses generally vanish [24][25][26][27][28][29]. In the elastic zone of low applied mean stress, the combination of residual tensile stress and applied load increases the mean stress and makes the welded joint seem to work under higher loads, thereby reducing the high-cycle fatigue resistance, whereas the residual stress does not contribute to the plastic collapse at crack tips [24][25][26], which coincides with the fatigue fractograph of the high-cycle failure 0.8-1.5-N joint without plastic region.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Fatigue resistance and failure behavior of penetration and non-penetration laser welded lap joints

Guo

Liu²,

et al. 2020

Preprint

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The fatigue resistance and failure behaviour of penetration 1.5 + 0.8-P and non-penetration 0.8 + 1.5-N laser welded lap joints prepared with 0.8 mm and 1.5 mm cold-rolled 301L plates were investigated. The weld beads showed a solidification microstructure of primary ferrite with good thermal cracking resistance, and their hardness was lower than that of the plates. The 1.5 + 0.8-P joint exhibited a better resistance to high-cycle fatigue failure, while the 0.8 + 1.5-N joint showed a higher resistance to low-cycle fracture. The failure modes of 0.8 + 1.5-N and 1.5 + 0.8-P joints were 1.5 mm and 0.8 mm lower lap plate fracture, respectively, and the primary cracks were initiated at welding fusion lines on the lap surface. There were long plastic ribs on the penetration plate fracture, but not on the non-penetration plate fracture. The fatigue resistance stress of the penetration and non-penetration plates in the crack initiation areas calculated based on the mean fatigue limits is 408 MPa and 326 MPa, respectively. The main reason for the difference in fatigue performance between the two laser welded joints was that the asymmetrical heating in the non-penetration plate thickness resulted in higher residual stress near the welding fusion line.

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Section: Analysis and Discussionmentioning

confidence: 99%

Fatigue resistance and failure behavior of penetration and non-penetration laser welded lap joints

Guo

Liu²,

et al. 2020

Preprint

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“…Several fatigue damage models are proposed to predict fatigue life and better describe the fatigue damage evolution of materials under fatigue loads. These models have been effectively employed in such fatigue fields as impact, fretting, additive manufacturing, and welding . Recently, some researchers have devoted their efforts to assessing the fatigue behaviour of welded joints by CDM‐based approaches.…”

Section: Introductionmentioning

confidence: 99%

“…These models have been effectively employed in such fatigue fields as impact, 18 fretting, 19 additive manufacturing, and welding. [20][21][22][23] Recently, some researchers have devoted their efforts to assessing the fatigue behaviour of welded joints by CDM-based approaches. Lautrou et al 24 predicted the fatigue crack initiation lives of S355NL steel welded joints with a twoscale damage model considering the welding residual stresses and obtained a satisfactory result.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Meng

2020

Fatigue Fract Eng Mat Struct

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The numerical analysis of low cycle fatigue of HTS‐A steel welded joints under combined bending and local compressive loads are implemented using the damage mechanics approach. First, a finite element numerical simulation of the welding process is employed to extract the welding residual stresses, which are then imported as initial stresses in the subsequent fatigue analysis. Second, a multiaxial fatigue damage model including damage coupled elasto‐plastic constitutive equations and plastic damage evolution formulation is applied to evaluate the mechanical degradation of the material under biaxial fatigue loads. Further, the fatigue lives of the HTS‐A steel welded joints are computed and compared with the experimental results from literature. A series of predicted load‐life curves clearly illustrates the variation of fatigue lives along with the combined loadings. Finally, the effects of local compression on accumulated plastic strain and fatigue damage are studied in detail. It is revealed that the local compression induces a damage competition between two critical zones.

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“…Consequently, there is an imminent urge to develop a method to comprehensively consider the weld‐induced residual stresses, initial damage, as well as the interactive relationship between the fatigue damage and residual stresses, when evaluating the fatigue property of welded structures. The continuum damage mechanics (CDMs) could be a suitable candidate because of its advantageous ability for describing the mechanical performance of a deteriorated material and for calculating the progressive damage by developing damage‐coupled constitutive model and thermodynamics‐based damage evolution laws . Do et al developed a nonlinear damage cumulative model, based on the CDM approach.…”

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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Fatigue damage evolution and lifetime prediction of welded joints with the consideration of residual stresses and porosity

Cited by 80 publications

References 40 publications

Fatigue resistance and failure behavior of penetration and non-penetration laser welded lap joints

Fatigue resistance and failure behavior of penetration and non-penetration laser welded lap joints

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

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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