Fatigue crack growth law identification by Digital Image Correlation and electrical potential method for ductile cast iron

Hosdez, Jérôme; Witz, Jean‐François; Martel, C.; Limodin, Nathalie; Najjar, Denis; Charkaluk, Éric; Osmond, Pierre; Szmytka, Fabien

doi:10.1016/j.engfracmech.2017.05.037

Cited by 23 publications

(20 citation statements)

References 45 publications

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“…If we compare Irwin's model with the residue localization, we can observe a good match [20] highlighting the fact that plasticity certainly contributes for an important part of the residue rise. Nonetheless residues may indicate other issues especially some non-considered 3D effects such as out-of-plane aspects or a non-straight crack propagation.…”

Section: Results and Limits In Terms Of Plasticitymentioning

confidence: 75%

“…In a previous article [20], an appropriate DIC displacements projection was conducted on Williams' basis. The limitations of the method, proving the necessity of DIC-FEM coupling, will be shown after presenting its main guidelines.…”

Section: Projective Approachmentioning

confidence: 99%

“…Indeed the first order corresponds to the analytical solution of Westergaard so that it enables to identify the Stress Intensity Factor: K I for the opening mode and K II for the in-plane shear mode. The projection method proposed in a previous work [20] can be summarized as follows:…”

Section: General Principlesmentioning

confidence: 99%

“…Indirect ways can be preferred by using an appropriate model as a projection basis, the Williams' expansion series for example [46]. Confined plasticity cases can be dealt with [1,18,28] but it is less suitable for large scale yielding conditions [20,25]. An alternative methodology to describe the local elastic-plastic effects was proposed by Decreuse et al [12] which consists in decomposing DIC displacements into an elastic part and a complementary one.…”

Section: Introductionmentioning

confidence: 99%

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Plastic zone evolution during fatigue crack growth: Digital image correlation coupled with finite elements method

Hosdez

Langlois

Witz

et al. 2019

International Journal of Solids and Structures

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et al.. Plastic zone evolution during fatigue crack growth: Digital image correlation coupled with finite elements method. International Journal of Solids and Structures, Elsevier, 2019, 171, pp.Abstract Nonlinearities effects at the crack tip, due to the elastic-plastic material behavior, impact the crack growth rate and path. This paper is devoted to the study of the plastic zone evolution in the crack tip region. The methodology relies on coupling an elastic-plastic Finite Elements Method (FEM) model and experimental displacements measured by Digital Image Correlation (DIC). These latter are introduced as Dirichlet boundary conditions in the finite elements analysis. The considered FEM domain is constant, i.e. the same mesh with a centered crack is moved to each new crack tip position deduced from DIC. The new boundary conditions are updated and the residual stresses and plastic strains of the former computation are interpolated and actualized on the mesh shifted to the new crack tip position in order to incorporate them in the numerical model. The coupling method allowed applying experimental boundary conditions in order to be as close as possible to real experimental conditions and to observe the plasticity evolution from small to large scale yielding conditions. A fatigue test was conducted to validate the proposed approach. The identification residues are proved to be lower than those obtained with an experimental displacements projection onto Williams' series basis, which is a method commonly used with DIC. The coupling results present an attractive similarity with Irwin's model regardless of the crack length. Thus, the definition of the mask needed for the displacements fields projection on Williams' model can be deduced with a reliable estimate of Irwin's plastic radius.

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Section: Results and Limits In Terms Of Plasticitymentioning

confidence: 75%

Section: Projective Approachmentioning

confidence: 99%

Section: General Principlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plastic zone evolution during fatigue crack growth: Digital image correlation coupled with finite elements method

Hosdez

Langlois

Witz

et al. 2019

International Journal of Solids and Structures

Self Cite

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“…In spite of its limitations, the DCPD method remains up to now the reference for crack length estimation. A recent work offers a comparison between DCPD and DIC‐based methodologies.…”

Section: Introductionmentioning

confidence: 99%

Crack path tracking from full field measurements: A novel empirical methodology

Feld-Payet

Besnerais

Bonnand

et al. 2020

Strain

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The identification of crack growth models requires the knowledge of the crack path geometry and, in particular, of the crack tip position. The objective of the present paper is to provide a criterion for the detection of the crack tip position regardless of the loading conditions or the material behavior. The novelty of the proposed approach is its ability to provide a good estimation of the crack tip even when large plastic deformations occur. The proposed empirical criterion uses the evolution of the displacement gradient standard deviation along a potential crack path to locate the crack tip. It thus relies on full field measures that are relatively smooth while providing accurate displacement vectors even close to the lips. We successfully apply the proposed criterion in two cases of fatigue crack growth: A straight crack at high temperature and a curved crack at room temperature involving large plastic deformations.

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