Preface

An advanced numerical methodology is developed for metal forming simulation based on thermodynamically-consistent nonlocal constitutive equations accounting for various fully coupled mechanical phenomena under finite strain in the framework of micromorphic continua. The numerical implementation into ABAQUS/Explicit is made for 2D quadrangular elements thanks to the VUEL users’ subroutine. Simple examples with presence of a damaged area are made in order to show the ability of the proposed methodology to describe the independence of the solution from the space discretization

Preface

An advanced numerical methodology is developed for metal forming simulation based on thermodynamically-consistent nonlocal constitutive equations accounting for various fully coupled mechanical phenomena under finite strain in the framework of micromorphic continua. The numerical implementation into ABAQUS/Explicit is made for 2D quadrangular elements thanks to the VUEL users’ subroutine. Simple examples with presence of a damaged area are made in order to show the ability of the proposed methodology to describe the independence of the solution from the space discretization

MODELLING OF DYNAMIC TENSION TESTS APPLIED TO DUCTILITY PROBLEMS

Nous proposons une simulation monodimensionnelle par éléments finis de l' essai de traction dynamique. Nous mettons en évidence les conséquences d'une réduction locale de la sectioninitiale de l'éprouvette et des effets d'inertie, en particulier sur l'histoire de la déformation et de la vitesse de déformation. L'influence des paramètres rhéologiques sur l'évolution de la ductilité est également étudiée .A one dimensional simulation of the dynamic tensile test, using the finite elements method is proposed. We enlighten the consequences of a local reduction of the initial specimen section and of inertia effects, in particular on strain and strain rate history. The influence of the rheological parameter on the ductility evolution has been also studied