Effect of damage-related microstructural parameters on plate tearing at steady state

Tekoğlu, Cihan; Nielsen, Kim Lau

doi:10.1016/j.euromechsol.2019.103818

Cited by 11 publications

(10 citation statements)

References 26 publications

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“…The authors of the present paper have recently investigated how the number and relative size of randomly distributed circular second phase particles (i.e., void nucleation sites) influence the crack surface morphology (see Tekoglu and Nielsen, 2019) and energy dissipation (see Andersen et al, 2020) in ductile tearing of thin metal plates.…”

Section: Problem Formulation and Finite Element Modelmentioning

confidence: 99%

“…The formulation of ductile plate tearing and the finite element (FE) model developed to address this problem are briefly explained below. For further details, the reader is referred to Tekoglu and Nielsen (2019); Andersen et al (2020).…”

Section: Problem Formulation and Finite Element Modelmentioning

confidence: 99%

“…1(a) and (b), diffuse thinning of the plate section starts significantly ahead of the crack tip and sets the extension of the fracture process zone. From this point onward, the interaction and evolution of the different stages leading to crack advance depend on the overall hardening capacity for the plate section set by the material configuration, which also determines the crack surface morphology (see Tekoglu and Nielsen, 2019). Imagine following a cross section of the plate from initiation of the plate thinning, i.e., when it enters the fracture process zone, until final separation.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Moreover, the cross sections of the fracture process zone are well approximated in the 2D plane strain (neglecting gradients in the crack growth direction) as the material above and below the thinning region elastically unloads and imposes a constraint on the deformation in the crack growth direction (see Andersen et al, 2019). A 2D modeling approach to large-scale plate tearing was used in Nielsen and Hutchinson (2012) to study isotropic metals, and later extended to heterogeneous materials in Tekoglu and Nielsen (2019). The present work further extends the investigation of large-scale plate tearing by adopting the 2D plane strain setup; it considers the shape and orientation of the void nucleation sites in addition to their number and size (see Fig.…”

Section: Problem Formulationmentioning

confidence: 99%

“…The main reason for the decrease in the energy is a shift from a cup-cup-like tearing mode, relying on severe plate thinning, to a slant failure that utilizes macroscopic shear localization and limited plate thinning. Investigations indicate that, when randomly distributed in a plate, a small number of nucleation sites promote cup-cup (also referred to as flat) failure, whereas a large number of nucleation sites, or even, a small number of large sites, yield a slant failure (see Tekoglu and Nielsen, 2019). The shift ties to the overall hardening capacity of the plate material; Pardoen et al (2004) discuss this in detail in relation to the cup-cup tearing mode for a broad palette of materials with moderate to high overall hardening capacity (see also Pineau et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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On the dependence of crack surface morphology and energy dissipation on microstructure in ductile plate tearing

et al. 2021

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The two distinct tearing mechanisms observed in ductile metal plates are the void-byvoid advance of the crack tip, and the simultaneous interaction of multiple voids on the plane ahead of the crack tip. Void-by-void crack advance, which leads to a cupcup crack surface morphology, is the dominant mechanism if the plate contains a low number of small void nucleation sites (i.e., second phase particles). Conversely, a large number and/or size of nucleation sites trigger the simultaneous interaction of multiple voids resulting in a slanted crack. The present work aims to provide further insight into the parameters controlling the mechanisms and energy dissipation of plate tearing by focusing on the shape and, thereby, the orientation of the nucleation sites. The study uses a two-dimensional plane strain finite element domain to model the cross section of a plate, subject to mode I tearing, with discretely modeled, randomly distributed, finite-sized elliptic void nucleation sites. The developed finite element setup can capture the dependence of the crack surface morphology on the microstructure of the plate. The simulation results confirm that cup-cup crack propagation develops by intense plastic straining throughout the thinning region of the plate. Conversely, slanted and cup-cone cracks propagate in thin localized shear deformation bands. The energy dissipation is, therefore, greater for cup-cup cracks. The study demonstrates that the damage-related microstructure has a significant role in determining the overall hardening capacity of a plate, which in turn dictates the tearing mode and energy.

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Section: Problem Formulation and Finite Element Modelmentioning

confidence: 99%

Section: Problem Formulation and Finite Element Modelmentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the dependence of crack surface morphology and energy dissipation on microstructure in ductile plate tearing

et al. 2021

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Cohesive traction–separation relations for tearing of ductile plates with randomly distributed void nucleation sites

2020

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The effect of constituent particles on the tear resistance of three 6000-series aluminium alloys

2022

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This paper investigates the tear resistance of three cast and homogenized 6000-series alloys, namely AA6061, AA6063 and AA6110, all in temper T6, by means of Kahn tear tests. Of each alloy one commercial version and one tailor-made version were studied. The tailor-made alloys were designed to have approximately three times higher content of constituent particles by increasing the amount of Fe and Si in the chemical composition. The aim was to study in what way a higher constituent-particle content affects the tear resistance and properties of the alloys. The research showed that the unit initiation and propagation energies measured from the Kahn tear tests are markedly reduced when the constituent-particle content is increased, and that the tear resistance is reduced by a higher fraction than the failure strain of the smooth tensile tests. No major differences in the fracture mode and the fracture mechanisms between the alloys with normal and with high constituent-particle content were revealed by the use of computed tomography scanning or scanning electron microscopy imaging. It was concluded for the alloys studied that the increased content of constituent particles had a significant effect on the tear resistance, while the fracture mode and mechanisms remained the same.

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Effect of damage-related microstructural parameters on plate tearing at steady state

Cited by 11 publications

References 26 publications

On the dependence of crack surface morphology and energy dissipation on microstructure in ductile plate tearing

On the dependence of crack surface morphology and energy dissipation on microstructure in ductile plate tearing

Cohesive traction–separation relations for tearing of ductile plates with randomly distributed void nucleation sites

The effect of constituent particles on the tear resistance of three 6000-series aluminium alloys

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