On the fracture behavior of inhomogeneous materials––A case study for elastically inhomogeneous bimaterials

Kolednik, O.; Predan, Jožef; Shan, G.X.; Simha, N.K.; Fischer, Franz Dieter

doi:10.1016/j.ijsolstr.2004.06.064

Cited by 56 publications

(20 citation statements)

References 31 publications

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“…The conclusion is that for E >E r and E ⇒ ∞, J tip goes to infinity, J tip ⇒ ∞, and that for E < E r and E r ⇒ ∞, J tip goes to zero, J tip ⇒ 0. This estimation agrees with the results of a case study reported in [6], Sect. 4.…”

Section: Applicationssupporting

confidence: 92%

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Application of material forces to fracture of inhomogeneous materials: illustrative examples

et al. 2006

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The material forces concept has become an elegant tool in continuum mechanics for the calculation of the thermodynamic driving force of a defect. Based on this concept, we have recently shown that inhomogeneities essentially shield or anti-shield crack tips from applied far-field stresses. The goal of this paper is to illustrate this by considering the model example of a crack in a CT-type specimen that contains a bimaterial interface. The crack driving force is calculated as the sum of the far-field driving force and the crack-tip shielding or anti-shielding. Several cases of inhomogeneity in either thermal or elastic properties are considered. Rather simple hand calculations are provided in addition to numerical results to illustrate the advantages of using the material forces concept.

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Section: Applicationssupporting

confidence: 92%

“…As the second step, the material forces concept is now engaged to find J tip . The material inhomogeneity term is [6][7][8] …”

Section: Problem Definitionmentioning

confidence: 99%

Application of material forces to fracture of inhomogeneous materials: illustrative examples

et al. 2006

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“…These features are also reflected in the material inhomogeneity term C inh , which increases sigmoidally with J far initially, but saturates at higher values (see inset graphs in Figure 4). A case study of the dependency of the material inhomogeneity term for elastically inhomogeneous materials is presented in Kolednik et al (2005).…”

Section: Inhomogeneous Elastic Modulusmentioning

confidence: 99%

Crack Tip Shielding or Anti-shielding due to Smooth and Discontinuous Material Inhomogeneities

et al. 2005

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International Journal of Fracture (2005) 135:73-93Abstract. This paper describes a theoretical model and related computational methods for examining the influence of inhomogeneous material properties on the crack driving force in elastic and elastic-plastic materials. Following the configurational forces approach, the crack tip shielding or antishielding due to smooth (e.g. graded layer) and discontinuous (e.g. bimaterial interface) distributions in material properties are derived. Computational post-processing methods are described to evaluate these inhomogeneity effects. The utility of the theoretical model and computational methods is demonstrated by examining a bimaterial interface perpendicular to a crack in elastic and elastic-plastic compact tension specimens.

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“…Although the J integral can be estimated so that it also represents local conditions [5,7,8,10], it is generally adopted as a global measure and as such, it requires a more intricate implementation in the case of bi-materials under large scale yielding. The CTOD is also theoretically better suited for characterizing cyclic loading in the context of a fatigue crack propagation law and was here obtained as the relative displacement of two nodes placed at the two ends of the blunted tip semi-circle.…”

Section: Methodsmentioning

confidence: 99%

“…These multilayered systems provide the required compromise between stiffness and tribological performance through a stiff backing layer and a conformable and low-friction lining. An additional attribute of multi-layered structures is the shielding effect that reduces the growth rate as cracks approach stiffer layers [2][3][4][5], thus increasing service life. The opposite effect is observed as a crack approaches a more compliant layer.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack shielding and deflection in plain bearings under large-scale yielding

Burke-Veliz

Syngellakis

Reed

2010

Engineering Failure Analysis

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Multi-layered bearing systems used in the automotive industry show shielding and antishielding effects that reduce or amplify the crack driving force under large scale yielding conditions. Using finite element analysis, it is shown that shielding in such systems results in path deflection and bifurcation despite the absence of mixed-mode loading. As the crack approaches a stiff layer, the tangential strains measured around a blunted crack tip model show a maximum corresponding to the direction of crack propagation. The distribution of such strains indicates the effect of shielding and the likelihood of the tip to deflect or bifurcate. The suitability of bi-layer and tri-layer bearing architectures is assessed through crack path and respective crack driving force predictions.

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On the fracture behavior of inhomogeneous materials––A case study for elastically inhomogeneous bimaterials

Cited by 56 publications

References 31 publications

Application of material forces to fracture of inhomogeneous materials: illustrative examples

Application of material forces to fracture of inhomogeneous materials: illustrative examples

Crack Tip Shielding or Anti-shielding due to Smooth and Discontinuous Material Inhomogeneities

Fatigue crack shielding and deflection in plain bearings under large-scale yielding

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