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Identification of plastic constitutive parameters at large deformations from three dimensional displacement fields

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Abstract

The aim of this paper is to provide a general procedure to extract the constitutive parameters of a plasticity model starting from displacement measurements and using the Virtual Fields Method. This is a classical inverse problem which has been already investigated in the literature, however several new features are developed here. First of all the procedure applies to a general three-dimensional displacement field which leads to large plastic deformations, no assumptions are made such as plane stress or plane strain although only pressure-independent plasticity is considered. Moreover the equilibrium equation is written in terms of the deviatoric stress tensor that can be directly computed from the strain field without iterations. Thanks to this, the identification routine is much faster compared to other inverse methods such as finite element updating. The proposed method can be a valid tool to study complex phenomena which involve severe plastic deformation and where the state of stress is completely triaxial, e.g. strain localization or necking occurrence. The procedure has been validated using a three dimensional displacement field obtained from a simulated experiment. The main potentialities as well as a first sensitivity study on the influence of measurement errors are illustrated.

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Abbreviations

a :

Acceleration

b :

Specific body force

[B k ]:

Matrix to evaluate the gradient at the integration point of element k

\({\fancyscript{B}_0,\fancyscript{B}_t}\) :

Body in the reference and current placement

da 0, da :

Element of area in the reference and current placement

dm 0, dm :

Element of mass in the reference and current placement

dv 0, dv :

Element of volume in the reference and current placement

E :

Young’s modulus

E = ln V :

Spatial logarithmic strain tensor

\({{\mathbf{E}^p}^{\bullet}}\) :

Plastic strain rate

\({\Delta \mathbf{E}_k^p}\) :

Plastic strain increment at element k

F :

Total traction force in the test

F :

Deformation gradient

\({\delta\mathbf{F}^{\bullet}}\) :

Virtual velocity gradient

f :

Resultant of the external forces

δ D :

Virtual rate of deformation tensor

I :

Unit tensor

\({\widehat{\mathbf{N}}_{P\,\,k}^{\,\,\,\,\,\,(t)}=\{ \widehat{n}_{ij}^P \}}\) :

Normalised tensor of the plastic flow

\({\widehat{\mathbf{N}}_{S\,\,k}^{\,\,\,\,\,(t)}=\{ \widehat{n}_{ij}^S \}}\) :

Normalised tensor of the deviatoric stress

n 0, n :

Normal vector in the reference and current placement

p :

Equivalent cumulated plastic strain

R :

Rotation tensor

R :

Lankford parameter

t :

Surface load

S = {s ij }:

Deviatoric part of the Cauchy stress tensor

T = {σ ij }:

Cauchy stress tensor

T 1PK :

1st Piola-Kirchhoff stress tensor

U, V :

Right and left stretch tensors

u :

Displacement vector

\({[\mathbf{u}_k^N ]}\) :

Matrix of the nodal displacement at element k

δ v :

Virtual velocity vector

\({[ \delta \mathbf{v}_k^N ]}\) :

Matrix of the nodal virtual velocity at element k

x 0, x :

Position vector in the reference and current placement

ν :

Poisson’s ratio

ξ = {X i }:

Constitutive parameters vector

σ T :

Equivalent stress

σ Y :

Yield stress

Φ p :

Yield function

χ :

Motion function

k :

Index referring to the element

N cp :

Number of constitutive parameters

N E :

Number of elements

N t :

Number of time steps

t :

Index referring the time step

·:

Inner or scalar product

| |:

Modulus of a tensor or absolute value of a scalar

Grad, grad :

Material and spatial gradient operator

scalars:

Italic letters like A, B, a, b, α, β …

vectors:

Small letters in bold like a, b, α, β …

tensors:

Large Latin letters in bold like A, B, …

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Authors and Affiliations

  1. LMPF, Arts et Métiers ParisTech, Rue St Dominique, B.P. 508, 51006, Châlons-en-Champagne, France

    Marco Rossi & Fabrice Pierron

Authors
  1. Marco Rossi
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  2. Fabrice Pierron
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Correspondence to Marco Rossi.

Additional information

The notation used in the paper follows the indications given in Elasticity and Plasticity of Large Deformations (Bertram, 2008) [1].

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Rossi, M., Pierron, F. Identification of plastic constitutive parameters at large deformations from three dimensional displacement fields. Comput Mech 49, 53–71 (2012). https://doi.org/10.1007/s00466-011-0627-0

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