Development of a Microscopic Damage Model for Low Stress Triaxiality

Achouri, Mohamed; Germain, Guénaël; Santo, Phillippe dal; Boude, Serge; Lebrun, J. L.; Saïdane, Delphine

doi:10.4028/www.scientific.net/kem.473.460

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Indeed, the modification introduces a phenomenological term that models the distortion and reorientation of voids dominated by shear stresses. This phenomenon was observed in previous experimental work performed on HSLA materials [12].…”

Section: Gtn Modelsupporting

confidence: 70%

Numerical integration of an advanced Gurson model for shear loading: Application to the blanking process

Achouri

Germain

Santo

et al. 2013

Computational Materials Science

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tA new extension of the Gurson damage model has been proposed recently to predict ductile fracture under shear dominated loads. The aim of this work is to verify the ability of this approach to simulate, in an accurate way, the damage evolution in shearing processes. An implicit stress integration algorithm is then developed to implement the new model in a finite element code. The numerical procedure is checked through simulations of shear and uniaxial tension tests on a single elements. The extended Gurson damage model is tested and applied to the punching process to compare its predictive ability with the original approach. The obtained numerical results are in good agreement with experimental results of the punching process, showing better ductile fracture predictions compared to the original Gurson model.

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Section: Gtn Modelsupporting

confidence: 70%

Numerical integration of an advanced Gurson model for shear loading: Application to the blanking process

Achouri

Germain

Santo

et al. 2013

Computational Materials Science

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“…It is often assumed that the coalescence of voids defines the beginning of macroscopic failure and that crack propagation is a series of void coalescences occurring in the structure until complete fracture [2]. Therefore, the discussion of damage in this section is closely related to failure by fracture since the strain at fracture seems to be a quantitative measure of the accumulated damage during plastic deformation.…”

Section: Mechanisms Of Ductile Damagementioning

confidence: 99%

Damage in metal forming

et al. 2020

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“…The basic formulation of the Gurson model is unable to predict location and rupture for shear dominated stress states as found in the blanking by punching process. Recent extensions to the Gurson model have been proposed by Nahshan [7] to take into account the accumulation of effective damage caused by the distortion of cavities and the inter-cavity interaction due to shear strain, as observed in a previous study [8].…”

Section: Introductionmentioning

confidence: 99%

Implementation and Validation of a Gurson Damage Model Modified for Shear Loading: Effect of Void Growth Rate and Mesh Size on the Predicted Behavior

Achouri

Germain

Santo

et al. 2012

KEM

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract. The optimization of automotive security components requires good knowledge of the material state after fabrication, particularly with respect to damage that may have been done to the material by the manufacturing process. To achieve this, numerical simulation of the fabrication process is often undertaken. However, classical continuum damage models, like the Gurson [3] model, are not appropriate for the simulation of the blanking by punching operation because the material damage is primarily the result of shear stresses. This work is focused on the use and validation of a modified Gurson type damage model capable of modeling this process, which has recently been proposed by Nahshan [7]. After a brief description of the modification, the implementation and the validation of the modified Gurson model is detailed. A comparison between the original Gurson model and the modified model is presented in order to highlight the importance of the modification for a pure shear stress state and to show that the two models are equivalent for a purely hydrostatic stress state. It is also shown that the results from the modified model are dependent on the finite element mesh size.

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Development of a Microscopic Damage Model for Low Stress Triaxiality

Cited by 5 publications

References 13 publications

Numerical integration of an advanced Gurson model for shear loading: Application to the blanking process

Numerical integration of an advanced Gurson model for shear loading: Application to the blanking process

Damage in metal forming

Implementation and Validation of a Gurson Damage Model Modified for Shear Loading: Effect of Void Growth Rate and Mesh Size on the Predicted Behavior

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