A simple ductile failure model with application to AA5182 aluminium sheet forming

Aretz, Holger; Keller, Stefan; Engler, Olaf; Brinkman, Henk-Jan

doi:10.1007/s12289-013-1127-x

Cited by 9 publications

(3 citation statements)

References 60 publications

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“…Aretz et al [8] proposed a predictive model based on a combination of the Marciniak-Kuczyński [9] and Hill's necking criteria [10], assembled together in a forming limit curve affected by a factor to account for large elements. An extension and experimental validation of the model was presented in [11], where the authors also pointed to the need of extending the models to account for bending loading. A different approach can be found in Andrade et al [12], where the authors proposed also a regularisation of the fracture criterion based on the element size and the stress state.…”

Section: Introductionmentioning

confidence: 99%

A through-thickness damage regularisation scheme for shell elements subjected to severe bending and membrane deformations

Costas

Morin

Hopperstad

et al. 2019

Journal of the Mechanics and Physics of Solids

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This research work proposes and validates a damage regularisation model for shell elements used in large-scale simulations. The model evaluates the ratio of bending to membrane loading in the elements based on the through-thickness gradient of the through-thickness plastic strain. The Cockcroft-Latham failure criterion is adopted, whose parameters are modified according to the length-to-thickness ratio of the shell elements in order to reduce the mesh dependency. This regularisation scheme is validated against experimental component tests on a double-chamber profile in an AA6005-T6 recrystallised aluminium alloy under quasi-static and impact loading conditions. The results show that the model is able to accurately predict fracture initiation under all tested conditions.

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Section: Introductionmentioning

confidence: 99%

A through-thickness damage regularisation scheme for shell elements subjected to severe bending and membrane deformations

Costas

Morin

Hopperstad

et al. 2019

Journal of the Mechanics and Physics of Solids

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“…In the present work the incremental rate-independent elastic-plastic constitutive model (co-rotational framework, additive strain decomposition, small elastic strains/finite plastic strains, isotropic linear elasticity, isotropic plastic hardening) briefly described in [4] is used to describe the mechanical response of the sheet material. Throughout the present work the following labelling of the material axes is used: the 1-axis denotes the rolling direction, the 2-axis the sheet transverse direction and the 3axis the sheet thickness direction.…”

Section: Constitutive Modelmentioning

confidence: 99%

Influence of Contact Friction on the Experimental Determination of the Balanced Biaxial Strain-Ratio Using the Disc Compression Test

Aretz

Barlat²

2014

KEM

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In the present work the disc compression test used to determine the balanced biaxial strain-ratio $r_b$ is analyzed in terms of the influence of contact friction using non-linear finite element analysis (FEA). The FEA results reveal an unexpectedly strong sensitivity of the $r_b$-value on contact friction, which is discussed in detail. The most important outcome of the present work is that the FEA can reproduce the $r_b$-value imposed by the utilized yield function very well, but only when the prescribed Coulomb friction coefficient has a very small value; for increasing friction coefficients a gradual deviation from the imposed $r_b$-value can be observed. This finding implies that in experiments contact friction must be eliminated to a larger extent than commonly expected, otherwise the determined $r_b$-value using disc compression testing will considerably deviate from the actual one, particularly when $r_b$ is far from one.

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“…Ebnoether and Mohr (2013) studied the fracture of low carbon steel sheets using the original Mohr-Coulomb criterion and the MMC. Aretz et al (2013) predicted fracture during the forming of an AA 5182 aluminium alloy.…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics of a dual-phase steel sheet

Björklund

Nilsson

2014

Journal of Materials Processing Technology

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Failure in ductile sheet metal structures is usually caused by one, or a combination of, ductile tensile fractures, ductile shear fractures or localised instability. In this paper the failure characteristics of the high strength steel Docol 600DP are explored. The study includes both experimental and numerical sections. In the experimental sections, the fracture surface of the sheet subjected to Nakajima tests is studied under the microscope with the aim of finding which failure mechanism causes the fracture. In the numerical sections, finite element (FE) simulations have been conducted using solid elements. From these simulations, local stresses and strains have been extracted and analysed with the aim of identifying the fracture dependency of the stress triaxiality and Lode parameter.

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A simple ductile failure model with application to AA5182 aluminium sheet forming

Cited by 9 publications

References 60 publications

A through-thickness damage regularisation scheme for shell elements subjected to severe bending and membrane deformations

A through-thickness damage regularisation scheme for shell elements subjected to severe bending and membrane deformations

Influence of Contact Friction on the Experimental Determination of the Balanced Biaxial Strain-Ratio Using the Disc Compression Test

Failure characteristics of a dual-phase steel sheet

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