Physically Based Kinematic Hardening Modelling of Single Crystal

Archives of Civil and Mechanical Engineering

et al. 2015

Self Cite

International audienceNowadays, numerical simulation by finite element analysis is an essential tool that allows performing virtually sheet metal forming processes, and therefore to reproduce various phenomena such as springback (SB) and necking that are generated by plastic deformation. However, the quality of the model used to represent the mechanical behaviour is a determining factor for the realism of numerical simulations. To perform well, the model must reproduce all the properties of the material such as the anisotropy and the strain hardening induced by plastic deformation. The main purpose of this work is to show, by means of numerical simulations, the influence of constitutive modelling on the prediction of the degree of SB in the case of a stretch bending test. Tests have been carried out on titanium sheets which have a wide range of applications for high tech industries because of specific mechanical and physical properties. At the same time, we have investigated the dependence of some process parameters such as the clamping force on SB. In order to prove the accuracy and reliability of the proposed finite element model, experimental data were used to compare with the numerical results

Section: Introductionmentioning

confidence: 99%

Constitutive modelling effect on the numerical prediction of springback due to a stretch-bending test applied on titanium T40 alloy

Maati

Archives of Civil and Mechanical Engineering

et al. 2015

Self Cite

“…This paper follows a series of works [1][2][3][4][5] which highlights the influence of these heterogeneities on plastic behaviour, on kinematic hardening, on anisotropy and roughness of material.…”

Section: Introductionmentioning

confidence: 99%

Young’s Modulus Determination: Influence of Microplasticity and Pseudo-Elasticity on Metal Forming

Bizet

et al. 2015

KEM

This paper shows that non-linearity of mechanical behaviour of metal in the elastic regime has an influence on the forming process. Discrete Dislocation Dynamics simulations show that pure elastic behaviour is altered when reversible dislocation displacements occur even in the very beginning of the elastic stage. The influence of such a non-linearity has an impact on the results of numerical simulations of industrial forming of very thin metal sheets of copper.

“…This specific physical property must be taken into account in order to obtain more efficient models. This paper follows a series of works [1][2][3] which highlights the influence of these heterogeneities on the plastic behaviour, the kinematic hardening, the anisotropy and the elastic behaviour. Heterogeneities that have been introduced in the modelling have increase significantly the performances of the model allowing restitution of phenomenon occurring at low cyclic strains as well as at large strain.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Impact of Constitutive Modelling on the Evolution of Necking in the Case of a Tensile Test on C68 Grade Steel

Sene

et al. 2014

KEM

This article deals with numerical simulation of necking. It draws the attention onto the importance of the description of strain-hardening and the effects on the evolution of necking. In order to compare necking evolution in relation with different plasticity models, a tracking procedure which consists in determining the evolution over time of discharged volumes of the sample is adopted. Models that take into account physical phenomena at the microscopic level and especially the heterogeneities of materials from a mechanical point of view seem well suited to fit experimental evidence connected to necking.