2D adaptive mesh methodology for the simulation of metal forming processes with damage

Labergère, Carl; Rassineux, Alain; Saanouni, Khémaïs

doi:10.1007/s12289-010-1001-z

Cited by 23 publications

(19 citation statements)

References 23 publications

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“…Since the present modeling is fully local, the IBVP solution with damage effect is highly dependent on the mesh size inside the active zones. Thus, for 2D problems, an adaptive resolution methodology with mesh refinement and coarsening is used with various error indicators based either on thermomechanical fields as well as on the radius curvature of the contact interfaces [27,64,66]. In this adaptive resolution methodology, the lowest mesh size is naturally attributed to the fully damaged elements.…”

Section: About the Numerical Resolution Schemesmentioning

confidence: 99%

Ductile damage prediction in sheet and bulk metal forming

Badreddine

Labergère

Saanouni

2016

Comptes Rendus. Mécanique

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This paper is dedicated to the presentation of an advanced 3D numerical methodology for virtual sheet and/or bulk metal forming simulation to predict the anisotropic ductile defects occurrence. First, the detailed formulation of thermodynamically-consistent fully coupled and fully anisotropic constitutive equations is given. The proposed constitutive equations account for the main material nonlinearities as the anisotropic plastic flow, the mixed isotropic and kinematic hardening and the anisotropic ductile damage under large inelastic strains. Second, the related numerical aspects required to solve the initial and boundary value problem (IBVP) are very briefly presented in the framework of the 3D finite element method. The global resolution schemes as well as the local integration schemes of the fully coupled constitutive equations are briefly discussed. Finally, some typical examples of sheet and bulk metal forming processes are numerically simulated using the proposed numerical methodology.

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Section: About the Numerical Resolution Schemesmentioning

confidence: 99%

Ductile damage prediction in sheet and bulk metal forming

Badreddine

Labergère

Saanouni

2016

Comptes Rendus. Mécanique

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“…The damaged state variables are applied to the local state variables according to the assumption of the equivalence of total energy developed in (see [12][13][14][15], [16], [17], [18], [19], [7], [21,22]). And for simplification, we also postulate that only the local damage is coupled with the micromorphic damage.…”

Section: State Relationsmentioning

confidence: 99%

“…The von Mises yield function and dissipation potentials used in ( [7], [12][13][14], [16], [17], [18], [19]) are used:…”

Section: Evolution Equationsmentioning

confidence: 99%

Advanced numerical simulation based on a non-local micromorphic model for metal forming processes

et al. 2016

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Abstract. An advanced numerical methodology is developed for metal forming simulation based on thermodynamically-consistent nonlocal constitutive equations accounting for various fully coupled mechanical phenomena under finite strain in the framework of micromorphic continua. The numerical implementation into ABAQUS/Explicit is made for 2D quadrangular elements thanks to the VUEL users' subroutine. Simple examples with presence of a damaged area are made in order to show the ability of the proposed methodology to describe the independence of the solution from the space discretization.

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“…Khakbaz (2012) and Wang (2008) found that the shear fracture angles range from 60° to 65° for ultrafine grained aluminum samples produced by SPD techniques. Labergère et al (2011) employed a fully adaptive 2D numerical methodology to simulate a tensile testing and the shear fracture angles of tensile samples were around 60º. predicts a constant 45°.…”

Section: Fracture Mechanism In Tensile Processmentioning

confidence: 99%

“…However, the reason for this phenomenon was still not clear. Labergère et al (2011) employed a fully adaptive 2D numerical methodology to simulate with accuracy various metal forming processes, e.g. tensile testing.…”

Section: Introductionmentioning

confidence: 99%

Tensile fracture of ultrafine grained aluminum 6061 sheets by asymmetric cryorolling for microforming

Tieu

Lü

et al. 2014

International Journal of Damage Mechanics

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Tensile fracture of ultrafine grained aluminum 6061 sheets by asymmetric cryorolling for microforming AbstractThe size effect on the mechanism of fracture in ultrafine grained sheets is an unsolved problem in microforming. This paper describes a tensile test carried out to study the fracture behavior and the shear fracture angles of both rolled and aged ultrafine grained aluminum 6061 sheets produced by asymmetric cryorolling. A scanning electron microscope was used to observe the fracture surface. The finite element method was used to simulate the tensile test using the uncoupled Cockcroft-Latham and Tresca criteria and the coupled Gurson-Tvergaard-Needleman damage criterion. It was found that the shear fracture angle decreases gradually from 90 degrees to 64 degrees with an increasing number of passes. The results of simulations using the Gurson-Tvergaard-Needleman criterion show trends similar to the experimental ones. The paper also presents a discussion on the fracture mechanism and the size effect during the tensile test. Yu, H., Tieu, K., Lu, C., Lou, Y., Liu, X., Godbole, A. and Kong, C. (2014) AbstractThe size effect on the mechanism of fracture in ultrafine grained sheets is an unsolved problem in microforming. This paper describes a tensile test carried out to study the fracture behavior and the shear fracture angles of both rolled and aged ultrafine grained Aluminum 6061 sheets produced by asymmetric cryorolling. A Scanning Electron Microscope (SEM) was used to observe the fracture surface. The finite element method was used to simulate the tensile test using the uncoupled Cockcroft-Latham and Tresca criteria and the coupled Gurson-Tvergaard-Needleman (GTN) damage criterion. It was found that the shear fracture angle decreases gradually from 90º to 64º with an increasing number of passes. The results of simulations using the GTN criterion show trends similar to the experimental ones. The paper also presents a discussion on the fracture mechanism and the size effect during the tensile test.

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2D adaptive mesh methodology for the simulation of metal forming processes with damage

Cited by 23 publications

References 23 publications

Ductile damage prediction in sheet and bulk metal forming

Ductile damage prediction in sheet and bulk metal forming

Advanced numerical simulation based on a non-local micromorphic model for metal forming processes

Tensile fracture of ultrafine grained aluminum 6061 sheets by asymmetric cryorolling for microforming

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