Fatigue crack initiation life estimation in a steel welded joint by the use of a two‐scale damage model

Lautrou, Nicolas; Thévenet, David; Cognard, Jean‐Yves

doi:10.1111/j.1460-2695.2009.01344.x

Cited by 32 publications

(13 citation statements)

References 11 publications

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“…Many fatigue failures of welded girder bridges have been observed in USA, Canada and other countries since 1960s 6 . To avoid these potential hazards, close attention was paid to fatigue life estimations and predictions for notched member 7–9 . Worden 10 provided a review of examples from nonlinear dynamical systems theory and nonlinear system identification techniques that were used for the feature‐extraction portion of the damage detection process.…”

Section: Introductionmentioning

confidence: 99%

Multi‐scale experimental study on fatigue damage behaviour and its effect on structural nonlinear response

Huaming

et al. 2012

Fatigue Fract Eng Mat Struct

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Experimental analyses on the structural response caused by local fatigue damage accumulation in welded details are accomplished to perform failure process and nonlinear effect analysis at different structural levels. The experiment is carried out by using welded compact tension (CT) specimens and a scaled truss specimen, and all of them have a notch at the weld toe to facilitate damage initiation. Cyclic loads are applied to those specimens to generate accumulative fatigue damage, respectively. The process of fatigue accumulation including initiation and propagation of fatigue cracks in the welded detail and resultant structural responses of CT specimens and the truss are measured with integration of multiple testing techniques. Multi‐scale experimental results show that microscopic‐/mesoscopic‐concentrated strain and extension of plastic zone in the vicinity of notch tip are both affected significantly by the fatigue damage accumulation and present appreciable nonlinear behaviour; however, the macroscopic response such as the frequency and stiffness parameters of the welded truss specimen are less sensitive to the low‐level fatigue damage. It is concluded that the fatigue failure of the welded truss is a multi‐scale progressive process due to fatigue damage trans‐scale evolving, in which the local meso‐damage firstly affects local strain of plastic zone in the vicinity of the notch tip, and then fatigue damage evolving from meso‐ to macro‐scale affects nonlinear responses of the damaged components; lastly, the fatigue failure could be expected as the results of the propagation of macroscopic fatigue cracks.

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Section: Introductionmentioning

confidence: 99%

Multi‐scale experimental study on fatigue damage behaviour and its effect on structural nonlinear response

Huaming

et al. 2012

Fatigue Fract Eng Mat Struct

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“…[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. Lee et al 25 predicted the fatigue lives of T-joint welds in the case of multiaxial high cycle fatigue (HCF) by virtue of a nonlinear multiaxial HCF damage model.…”

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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“…Therefore, bi-directional synchronization analysis between the global models and local re¯ned models has become a focus in the civil engineerinḡ eld. [9][10][11][12] Two primary methods currently exist to acquire the exact dynamic e®ects of complex structures, both of which are highly dependent on an updated¯nite element (FE) technique. [13][14][15] The¯rst method creates sophisticated models through further mesh re¯nements.…”

Section: Introductionmentioning

confidence: 99%

Accurate Dynamic Responses Analysis of Orthotropic Steel Decks Using a Novel Multiscale Time-Varying Boundary Approximation Method

Tian

Zhang

Xia

et al. 2017

Int. J. Str. Stab. Dyn.

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An accurate evaluation of the dynamic responses on critical components of orthotropic bridge decks is of significance for identifying structural damage and predicting the fatigue life of long-span cable-stayed bridges. However, the traditional finite element (FE) methods are computationally cost-prohibitive for this application. In response, a new multiscale time-varying analysis method based on the dynamic balance equations and FE strategies is proposed and derived theoretically in this paper. Unlike most existing methods, the dynamic responses of this refined model is easily solved through repeated iterations, using the dynamic responses of a large-scale model as the boundary conditions. To validate the effectiveness of the method, a simply supported steel plate beam was used in a field test that demonstrated good correlation between the analytical dynamic responses and the experimental ones. To further validate this method, a case study involving a whole segment model of the Pingtan Bridge orthotropic bridge deck was established and the complex junction area between the plate and longitudinal ribs was modeled using two refinement processes. For comparison, a sufficiently refined model was also developed using ANSYS software based on the traditional FE methods. This study attempted to provide a new high-efficiency analysis framework for accurate analysis of local vibration problems. Under relatively small and easily manageable calculation conditions at each cross-scale processing level, the proposed method meets not only the requirements of global design for actual engineering applications, but also supports further in depth analysis.

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Fatigue crack initiation life estimation in a steel welded joint by the use of a two‐scale damage model

Cited by 32 publications

References 11 publications

Multi‐scale experimental study on fatigue damage behaviour and its effect on structural nonlinear response

Multi‐scale experimental study on fatigue damage behaviour and its effect on structural nonlinear response

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

Accurate Dynamic Responses Analysis of Orthotropic Steel Decks Using a Novel Multiscale Time-Varying Boundary Approximation Method

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