Numerical simulation of springback using enhanced assumed strain elements

Bui, Q. V.; Papeleux, Luc

doi:10.1016/j.jmatprotec.2004.04.342

Cited by 32 publications

(26 citation statements)

References 8 publications

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“…Alternatively, other continuum-type user elements can be coupled with the elasto-plastic constitutive models by means of the incremental kinematics framework described in this section. 9 …”

Section: Hardening Modelsmentioning

confidence: 99%

“…In order to circumvent locking phenomena for three-dimensional low-order elements, several authors, like Bui et al [9], Areias et al [7] and Fontes Valente et al [17], have used the enhanced assumed strain (EAS) method (or incompatible mode method), based on Simo and Rifai's pioneer work [44]. The basis of such element formulations is given by the mixed variational principle in which the so-called incompatible strain and stress act as additional independent variables.…”

Section: Introductionmentioning

confidence: 99%

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Application of the continuum shell finite element SHB8PS to sheet forming simulation using an extended large strain anisotropic elastic–plastic formulation

Salahouelhadj

Abed‐Meraim²,

Chalal³

et al. 2012

Arch Appl Mech

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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.This is an author-deposited version published in: https://sam.ensam.eu Handle ID: .http://hdl.handle.net/10985/6871 To cite this version :Abdellah SALAHOUELHADJ, Farid ABED-MERAIM, Hocine CHALAL, Tudor BALAN -Application of the continuum shell finite element SHB8PS to sheet forming simulation using an extended large strain anisotropic elastic-plastic formulation -Archive of Applied Mechanics -Vol. 82, n°9, p.1269-1290 -2012 Any correspondence concerning this service should be sent to the repository Administrator : archiveouverte@ensam.euArchive of Applied Mechanics manuscript No.(will be inserted by the editor)Application of the continuum shell finite element SHB8PS to sheet forming simulation using an extended large strain anisotropic elastic-plastic formulation the date of receipt and acceptance should be inserted later Abstract This paper proposes an extension of the SHB8PS solid-shell finite element to large strain anisotropic elasto-plasticity, with application to several non-linear benchmark tests including sheet metal forming simulations. This hexahedral linear element has an arbitrary number of integration points distributed along a single line, defining the "thickness" direction; and to control the hourglass modes inherent to this reduced integration, a physical stabilization technique is used. In addition, the assumed strain method is adopted for the elimination of locking. The implementation of the element in Abaqus/Standard via the UEL user subroutine has been assessed through a variety of benchmark problems involving geometric non-linearities, anisotropic plasticity, large deformation and contact. Initially designed for the efficient simulation of elastic-plastic thin structures, the SHB8PS exhibits interesting potentialities for sheet metal forming applications -both in terms of efficiency and accuracy. The element shows good performance on the selected tests, including springback and earing predictions for Numisheet benchmark problems.Keywords solid-shell element · reduced integration · physical stabilization · assumed strain method · elastic-plastic behavior · anisotropic plasticity · sheet metal forming · springback 1 Introduction

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“…Alternatively, other continuum-type user elements can be coupled with the elasto-plastic constitutive models by means of the incremental kinematics framework described in this section. 9 …”

Section: Hardening Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of the continuum shell finite element SHB8PS to sheet forming simulation using an extended large strain anisotropic elastic–plastic formulation

Salahouelhadj

Abed‐Meraim²,

Chalal³

et al. 2012

Arch Appl Mech

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show abstract

“…Linear Elements had to be used since as described by Konter (2000) in ABAQUS second-order quadrilateral elements at the contact surface will transfer the contact-force/pressure non-uniformly, sharing 1/6 on each corner node and 2/3 for each middle node. Moreover, Bui et al (2004) found linear elements with reduced integration to be very suitable for metal forming processes including large bending and large plastic strains, and compared to their fully integrated counterparts, do not suffer from shear locking.…”

Section: General Set Up Of Modelmentioning

confidence: 99%

Predicting plastic deformation and work hardening during V-band formation

Müller

Barrans

Blunt

2011

Journal of Materials Processing Technology

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V-Band Clamps are manufactured using a cold roll forming process consisting of six passes which plastically deform an initially flat strip by bending to produce the band's V-section. In this paper a new method of validating numerically predicted plastic deformation in a cold formed metal strip is presented. Tensile testing of samples of the band's material was used to obtain a direct link between plastic strain and work hardness of this particular material. Using this correlation, the equivalent plastic strain (PEEQ) values predicted by finite element simulations were converted into hardness values.These values were compared to experimental work, in which samples of each pass of the roll forming process were taken to determine the work hardness in the cross section of the V-band using a microhardness machine. The error in strain predicted by the numerical method and hardness obtained by testing was found to be between 0.4% and 16.9%. This error was mainly due to uncertainty in material properties and the accuracy of the measurement technique. Compared to the more classical approach of measuring strain distribution with strain gauges, this method is more precise and accurate, as it is able to pick up even small changes in strain distribution.

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“…The resolution of the coupled problem is achieved in two steps: at first a mechanical step to solve the mechanical problem (see (5)) and secondly a thermal step to solve heat equation (see (9)) For the resolution of mechanical problem, the Newmark algorithm family is selected (see [5][6]). At each time step, the mechanical system (5) has to be solved for each node:…”

Section: Implicit Thermochanical Algorithmmentioning

confidence: 99%

An efficient implicit approach for the thermomechanical behavior of materials submitted to high strain rates

Jeunechamps

Ponthot

2006

J. Phys. IV France

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Abstract. In the present paper, three solutions are proposed to simulate fast phenomena with finite element method at best. At first, material constitutive laws of Johnson-Cook and Zerilli-Armstrong types are implemented. These well-known laws are efficient for the description of material behavior at high velocities, especially for material used in automotive or aeronautics industry. The second contribution of this paper is the coupling of an implicit Chung-Hulbert algorithm taking into account the inertial effects with a staggered scheme for solving the thermal problem. The last input of this paper is the use of EAS (Enhanced Assumed Strain) finite elements to better capture complex strain modes, especially bending that is not accurately evaluated with classical finite elements. These EAS finite elements are used in the scope of thermomechanical dynamic phenomena implemented in a modular C++ environment at the University of Liège in the home made software METAFOR.

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Numerical simulation of springback using enhanced assumed strain elements

Cited by 32 publications

References 8 publications

Application of the continuum shell finite element SHB8PS to sheet forming simulation using an extended large strain anisotropic elastic–plastic formulation

Application of the continuum shell finite element SHB8PS to sheet forming simulation using an extended large strain anisotropic elastic–plastic formulation

Predicting plastic deformation and work hardening during V-band formation

An efficient implicit approach for the thermomechanical behavior of materials submitted to high strain rates

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