Damage and Fracture of Ductile Sheet Metals: Experiments and Numerical Simulations with New Biaxial Specimens

Gerke, Steffen; Schmidt, Marco; Dirian, Moritz; Brünig, Michael

doi:10.1007/978-3-319-70563-7_5

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…Many experiments with different biaxially loaded specimens and corresponding numerical simulations have been performed by the group of the corresponding author during the last years [10,15,16,18,23,24]. Some experimental and numerical results are reconsidered in the present paper and are used to propose a new fracture criterion.…”

Section: Experimental and Numerical Resultsmentioning

confidence: 99%

A fracture criterion for ductile metals based on critical damage parameters

Brünig

Schmidt

Gerke

2020

Continuum Mech. Thermodyn.

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The paper deals with the effect of different stress-state-dependent damage mechanisms on the onset of fracture in ductile metals. A continuum damage model is discussed using a strain tensor as an appropriate damage variable. It takes into account the influence of stress state on the damage condition and on the evolution equations of damage strains. A fracture condition based on critical damage parameters is developed analyzing results of a series of new experiments with different biaxially loaded specimens. After the tests, fracture modes are visualized by scanning electron microscopy. Numerical simulations of the biaxial experiments elucidate the stress states in critical regions of the specimens which are used to explain formation of different damage and fracture modes on the micro-level. Analysis of numerically predicted damage strains for different loading cases leads to a generalized fracture criterion.

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Section: Experimental and Numerical Resultsmentioning

confidence: 99%

A fracture criterion for ductile metals based on critical damage parameters

Brünig

Schmidt

Gerke

2020

Continuum Mech. Thermodyn.

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“…expressed in terms of the stress invariants I 1 = trτ and J 2 = 1 2 τ dev : τ dev of the Kirchhoff stress tensor and the damage threshold σ d , see [21][22][23] for further details. In Eq.…”

Section: Constitutive Equations and Materialsmentioning

confidence: 99%

“…Unfortunately, these standard geometries tend to localize with ongoing deformation and unexpected failure of the specimen occurs. In this context, a new experimental program with biaxially loaded specimens has been proposed [9,21], where stress states have been analyzed by corresponding numerical simulations to predict damage and fracture modes. In addition, [20] proposed several new geometries and first experimental results with the X0-specimen have been presented [13,22,23].…”

Section: Introductionmentioning

confidence: 99%

Shape optimization of the X0-specimen: theory, numerical simulation and experimental verification

et al. 2020

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The paper deals with the gradient based shape optimization of the biaxial X0-specimen, which has been introduced and examined in various papers, under producibility restrictions and the related experimental verification. The original, engineering based design of the X0-specimen has been applied successfully to different loading conditions persisting the question if relevant stress states could be reached by optimizing the geometry. Specimens with the initial as well as with the two load case dependent optimized geometries have been fabricated of the aluminum alloy sheets (AlSi1MgMn; EN AW 6082-T6) and tested. The strain fields in critical regions of the specimens have been recorded by digital image correlation technique. In addition, scanning electron microscope analysis of the fracture surfaces clearly indicate the stress state dependent damage processes. Consequently, the presented gradient based optimization technique facilitated significant improvements to study the damage and fracture processes in a more purposeful way.

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New biaxially loaded specimens for the material parameter identification of ductile damage

Gerke

Schmidt

Brünig

2018

Proc Appl Math and Mech

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The paper deals with new biaxial experiments to study the damage and fracture behavior of ductile sheet metal. For this purpose the H-specimen has been specially designed and is subjected to different proportional loadings within this context.The stress state dependent damage and fracture behavior can be described by a phenomenological continuum damage and fracture model which is briefly presented. In continuation results of new biaxial experiments are given which facilitate the study of different damage mechanisms in a well controlled way. The proposed H-specimen is applied for shear-tension as well as for shear-compression load cases and can be used to evaluate the corresponding continuum damage model. Furthermore a perspective to future work is given.

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Damage and Fracture of Ductile Sheet Metals: Experiments and Numerical Simulations with New Biaxial Specimens

Cited by 4 publications

References 29 publications

A fracture criterion for ductile metals based on critical damage parameters

A fracture criterion for ductile metals based on critical damage parameters

Shape optimization of the X0-specimen: theory, numerical simulation and experimental verification

New biaxially loaded specimens for the material parameter identification of ductile damage

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