Numerical and experimental investigations of Ti-6Al-4V chip generation and thermo-mechanical couplings in orthogonal cutting
TypeArticles dans des revues avec comité de lecture
The chip formation mechanism of the Ti-6Al-4V remains a challenging problem in the machining process as well as its modeling and simulation. Starting from experimental observation on the titanium alloys Ti-6Al-4V machining shows that the ductile fracture in the chip formation is dominated by the shear phenomenon under high strain rate and temperature, the present work develops a new coupled behavior and damage model for better representation and understanding of the chip formation process. The behavior and damage of Ti-6Al-4V have been studied via hat-shaped specimen under temperature up to 900 °C and strain rate up to 1000 s−1. An inverse identification method based on Finite Element (FE) is established in order to determine the constitutive law’s parameters. The prediction of the segmented chip was analyzed through 3D finite element orthogonal cutting model which was validated by an in-situ and post-mortem orthogonal cutting machining observations. Finally, a particular attention is focused on the chip formation genesis which is described by three steps: Growth, Germination and Extraction.
Showing items related by title, author, creator and subject.
ZERAMDINI, Bessam; ROBERT, Camille; GERMAIN, Guénaël; POTTIER, Thomas (Springer, 2016)In this paper, a fully adaptive 3D numerical methodology based on a tetrahedral element was proposed in order to rove the finite element simulation of any metal forming process. This automatic methodology was implemented ...
POTTIER, Thomas; GERMAIN, Guénaël; CALAMAZ, Madalina; MOREL, Anne; COUPARD, Dominique (Springer, 2014)The present paper details a simple and effective experimental procedure dedicated to strain measurement during orthogonal cutting operations. It relies on the use of high frame-rate camera and optical microscopy. A numerical ...
Numerical simulation of metal forming processes with 3D adaptive Remeshing strategy based on a posteriori error estimation ZERAMDINI, Bessam; ROBERT, Camille; GERMAIN, Guénaël; POTTIER, Thomas (Springer Science and Business Media LLC, 2018)In this work, a fully automated adaptive remeshing strategy, based on a tetrahedral element for 3D metal forming processes, was proposed in order to solve problems associated with the severe mesh distortion that occurs ...
GIRAUD, Eliane; ROSSI, Frédéric; GERMAIN, Guénaël; OUTEIRO, José (Elsevier, 2013)The success of a FE model for metal cutting process is strongly dependent on the accurate characterization of the workpiece material, under similar conditions as those found in metal cutting. In this paper, dynamic shear ...
Development of a numerical model for the understanding of the chip formation in high-pressure water-jet assisted machining AYED, Yessine; ROBERT, Camille; GERMAIN, Guénaël; AMMAR, Amine (Elsevier, 2016)The aim of this study is to develop a new numerical cutting model that includes fluid structure interaction and to take into account heat transfer between the water-jet, the workpiece and the chip. This has been achieved ...