A simple fracture mechanics estimation of the fatigue endurance of welded joints

Chapetti, Mirco Daniel; Steimbreger, Ceferino

doi:10.1016/j.ijfatigue.2019.03.021

Cited by 17 publications

(7 citation statements)

References 32 publications

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“…Thus, the life for welded joints and components is dominated by fatigue crack growth. Further, it illustrates the reliability and popularity of fatigue strength and fatigue life assessments for different failure modes in welded joints (Zhang et al, 2018;Ahola et al, 2019a;Chapetti and Steimbreger, 2019;Liu et al, 2020). The contribution of either fatigue crack initiation or propagation onto the fatigue life is strongly influenced by the material properties and loading conditions.…”

Section: Introductionmentioning

confidence: 90%

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Song

Liu

et al. 2021

Front. Mater.

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Welding of steel is a technique frequently used in practical engineering applications; however, their mechanical performance is strongly dependent on the physical metallurgical status of the weldments. In the present study, fully reversed, strain-controlled low-cycle fatigue (LCF) tests were conducted on 10CrNi3MoV steel and its undermatched weldments with strain amplitudes varying from Δε = ±0.5 to ±1.2%. Both base metal and weldments exhibited softening behavior at the beginning of the cyclic stage. Numerical investigations of cyclic stress–strain evolutions of the materials have been studied by the cyclic plastic model considering nonlinear hardening. The continuous damage mechanics (CDM) theory based on the experimental hysteresis stress–strain energy concept was employed to illustrate LCF failure, including damage initiation and deterioration. The damage mechanics approach calibrates the material parameters from the measured fatigue life for initiation and growth stages. Afterward, the combination of material cyclic plastic parameters and damage parameters was implemented to predict the LCF life. Good agreement can be observed between the experimental results and the FE results based on the CDM approach. Finally, the damage evolution of the materials under different strain amplitudes by this approach was assessed.

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Section: Introductionmentioning

confidence: 90%

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Song

Liu

et al. 2021

Front. Mater.

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“…However, these analyses of failure mode only aim at specific weld joints size. Details of the fracture mechanics approach and the applications in terms of fatigue failure issues for different types of welded joints and components were exhibited in previous studies, [22][23][24][25][26][27][28][29][30] including the model extension for specific welded joints, residual stress effect, failure mode effect, geometry differences, and loading modes. Some literature works have been devoted to understanding residual stress on fatigue crack growth (FCG) and the fatigue strength of welded joints.…”

Section: Introductionmentioning

confidence: 99%

Fatigue fracture assessment of 10CrNi3MoV welded load‐carrying cruciform joints considering mismatch effect

Song

Liu

et al. 2021

Fatigue Fract Eng Mat Struct

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Fatigue experiments and numerical simulations based on the linear elastic fracture mechanics (LEFM) theory were conducted on the evenmatched (EM) and undermatched (UM) 10CrNi3MoV load-carrying cruciform welded joints (LCWJs). The study firstly experimentally investigated the fatigue crack growth rate (FCGR) of base metal, EM, and UM weldments. The corresponding Paris parameters as essential input data are provided to assess the fatigue crack propagation behavior for weld toe and weld root failure caused by notch stress concentration variations. On the one hand, the stress intensity factors (SIFs) at weld toe and weld root were calculated considering the effects of LCWJ specimen geometries, initial crack types, and sizes. The comparisons between simulated results and standards analytical solutions were executed, which exhibit good accordance. It proved that the fatigue fracture simulation procedure based on LEFM is appropriate for the fatigue assessment of LCWJs. Eventually, it conducted the parametric analysis by predicted S-N curves, which included in the weld length, initial crack shape, initial crack size, penetration length, and materials fracture parameter, to explore some safety assessment reference lines for both failure modes of LCWJ.

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“…A largely used approach is the effective notch stress defined by Radaj et al, [2][3][4] where a fictitious notch tip radius is introduced at the weld toe and weld root; the fatigue strength is related to the local notch peak stress. [6][7][8][9][10] The first approach is able to compute the number of cycles up to final failure of an existing crack or defect; the second mainly focuses on crack initiation modelling. 5 Other widely used approaches are based on fracture mechanics or on elastoplastic strain analysis of actual weld geometries; several contributions are present in the literature, even recent papers are available.…”

Section: Introductionmentioning

confidence: 99%

“…5 Other widely used approaches are based on fracture mechanics or on elastoplastic strain analysis of actual weld geometries; several contributions are present in the literature, even recent papers are available. [6][7][8][9][10] The first approach is able to compute the number of cycles up to final failure of an existing crack or defect; the second mainly focuses on crack initiation modelling. In both cases, complex investigations are necessary taking into account the actual local properties of the welded material modified by the welding process and sometimes requiring detailed knowledge of residual stress distribution.…”

Section: Introductionmentioning

confidence: 99%

Overview of the geometrical influence on the fatigue strength of steel butt welds by a nonlocal approach

Livieri

Tovo

2019

Fatigue Fract Eng Mat Struct

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The paper deals with the high-cycle fatigue behaviour of steel butt-welded joints in the as-welded condition, under constant amplitude loading. It tackles the problem of strength assessment by changing the geometrical shape and features of the weldment. This investigation considers the recommendations available in design standards, particularly referring to the Eurocodes, and it reanalyses experimental data where a clear profile of the actual weld shape is available. For the available weld profiles, numerical investigations are shown by applying the Implicit Gradient approach for the evaluation of the nonlocal effective stress in the fatigue strength assessment. The results are very promising since the nonlocal approach significantly agrees with design standard recommendations in conventional cases, but it is also able to provide specific indications on the influence of the geometrical features, as well as the tip radius and opening angles, specifying their influence when no explicitly detailed indications are available in the design standards.

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A simple fracture mechanics estimation of the fatigue endurance of welded joints

Cited by 17 publications

References 32 publications

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Fatigue fracture assessment of 10CrNi3MoV welded load‐carrying cruciform joints considering mismatch effect

Overview of the geometrical influence on the fatigue strength of steel butt welds by a nonlocal approach

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