Evaluation of identification methods for YLD2004-18p

Grytten, Frode; Holmedal, Bjørn; Hopperstad, Odd Sture

doi:10.1016/j.ijplas.2007.11.005

Cited by 73 publications

(48 citation statements)

References 38 publications

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“…Nevertheless, it is still fairly accurate and computationally efficient. The use of this model for predicting the yield stress anisotropy against other models (relaxed constraint, selfconsistent and finite element models) is discussed in [4] and [48].…”

Section: Polycrystal Modellingmentioning

confidence: 99%

“…If some grain orientations are more prominent, or in other words if the polycrystal has a non-random crystallographic texture, the grains with these orientations will have a pronounced contribution to the anisotropy of the whole sample. If the texture of the polycrystal is known, a variety of methods is available to determine the plastic anisotropy, including the full-constraint Taylor model, relaxed-constraint Taylor models, the self-consistent viscoplastic model and finite element models [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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A microstructure-based yield stress and work-hardening model for textured 6xxx aluminium alloys

Khadyko

Myhr

Dumoulin

et al. 2016

Philosophical Magazine

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Section: Polycrystal Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A microstructure-based yield stress and work-hardening model for textured 6xxx aluminium alloys

Khadyko

Myhr

Dumoulin

et al. 2016

Philosophical Magazine

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“… is the Cauchy stress in grain i and n is the total number of grains. The use of the Taylor model (here the so-called full-constraint variant is used) against a FEM model of a polycrystal and various relaxed constraint models is discussed in [23] and [38]. The conclusion is that no method is universally good at describing the polycrystal response, while the Taylor model has the advantage of simplicity and computational efficiency.…”

Section: Polycrystal Modellingmentioning

confidence: 99%

“…The limits of this method are discussed in [23]. Crystal plasticity is used to find the yield surface of textured alloys in [24,25,26].…”

Section: Introductionmentioning

confidence: 99%

An experimental–numerical method to determine the work-hardening of anisotropic ductile materials at large strains

Khadyko¹,

Dumoulin²,

Hopperstad³

2014

International Journal of Mechanical Sciences

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The determination of work hardening for ductile materials at large strains is difficult to perform in the framework of usual tensile tests because of the geometrical instability and necking in the specimen at relatively low strains. In this study we propose a combination of experimental and numerical techniques to overcome this difficulty. Extruded aluminium alloys are used as a case since they exhibit marked plastic anisotropy. In the experiments, the minimum diameters of the axisymmetric tensile specimen in two normal directions are measured at high frequency by a laser gauge in the necking area together with the corresponding force, and the true stress-strain curve is found. The anisotropy of the material is determined from its crystallographic texture using the crystal plasticity theory. This data is used to represent the specimen by a 3D finite element model with phenomenological anisotropic plasticity. The experimental true stress-strain curve is then used as a target curve in an optimization procedure for calibrating the hardening parameters of the material model.As a result, the equivalent stress-strain curve of the material up to fracture is obtained.

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“…[2][3][4][5][6][7][8][9]. One of the advantages of the model is its flexibility in describing plastic deformation of orthotropic materials and the availability of a 3D and a plane stress version.…”

Section: Introductionmentioning

confidence: 99%

Parameter reduction for the Yld2004-18p yield criterion

et al. 2015

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The Yld2004-18p yield criterion uses 18 parameters to define anisotropy for a full 3D stress state. It is demonstrated in this paper that dependencies between the parameters exist and for a given set of experimental data the parameters are not uniquely defined. Analysis of the yield function shows that two specific combinations of parameters do not contribute to the value of the yield function. Therefore, the number of parameters can be reduced to 16, without any loss of flexibility. Similarly, the number of parameters for the plane stress version of this yield criterion reduces from 14 to 12.

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Evaluation of identification methods for YLD2004-18p

Cited by 73 publications

References 38 publications

A microstructure-based yield stress and work-hardening model for textured 6xxx aluminium alloys

A microstructure-based yield stress and work-hardening model for textured 6xxx aluminium alloys

An experimental–numerical method to determine the work-hardening of anisotropic ductile materials at large strains

Parameter reduction for the Yld2004-18p yield criterion

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