Numerical analysis of the Ti6Al4V behavior based on the definition of a new phenomenological model
Article dans une revue avec comité de lecture
The finite element modeling is significantly dependent on the accurate prediction of the material behavior. In order to increase the accuracy of numerical simulations, a new phenomenological model is proposed in this study. Its mathematical formulation allows suitable predictions of the Ti6Al4V sensitivity to strain rates and temperatures, while maintaining a low identification cost of its constitutive coefficients.A subroutineVUMATis developed, and its reliability is investigated in the case of themodeling of uniaxial tensile and impact tests. In addition, the 3D numerical analysis of the machining process is investigated based on the definition of the rheological Johnson-Cook model and the proposed one. Experimental orthogonal machining tests are also established for several cutting conditions. The significant sensitivity of the chip serration, the segments geometry, and the cutting forces to the feed rate is pointed out. Comparisons of the numerical results corresponding to different constitutive models are carried out. High-correlation levels with the experimental results are reached with the definition of the proposed phenomenological model, which is not the case of the Johnson-Cook empirical law.Moreover, intuitive insights about the effect of cutting conditions on the material flow towards the workpiece edges are provided with the 3D modeling. A pronounced increase of the width of side burrs with the feed rate rise was underlined. The results presented in this study point out the inability of 2D numerical simulations to accurately predict the phenomena induced during the machining process, even in the case of an orthogonal machining
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Numerical analysis of constitutive coefficients effects on FE simulation of the 2D orthogonal cutting process: application to the Ti6Al4V Article dans une revue avec comité de lectureYAICH, Mariem; AYED, Yessine; BOUAZIZ, Zoubeir; GERMAIN, Guénaël (Springer Verlag, 2016)In this paper, a deep study of constitutive parameters definition effect is done in order to guarantee sufficient reliability of the finite element machining modeling. The case of a particular biphasic titanium alloy Ti6Al4V ...
A 2D finite element analysis of the effect of numerical parameters on the reliability of Ti6Al4V machining modeling Article dans une revue avec comité de lectureYAICH, Mariem; AYED, Yessine; BOUAZIZ, Zoubeir; GERMAIN, Guénaël (Taylor & Francis, 2020)The numerical analysis, based on the finite element modeling (FEM), presents nowadays an efficient computational tool. It allows a better understanding of several thermo-mechanical phenomena involved during the machining ...
A 3D Numerical Analysis of the Chip Segmentation Mechanism and the Side Burr Formation During the Ti6Al4V Alloy Machining Ouvrage scientifiqueYAICH, Mariem; AYED, Yessine; BOUAZIZ, Zoubeir; GERMAIN, Guénaël (Springer International Publishing, 2020)A 3D finite element modeling of the orthogonal turning process was curried out in the current study. It aims to carefully investigate the mechanisms controlling the chip segmentation and the crack propagation direction in ...
Communication avec acteTRABELSI, Sabrine; BOUAZIZ, Zoubeir; GERMAIN, Guénaël; MOREL, Anne (Springer International Publishing, 2015)Understanding of local mechanisms chip forming during machining by removal of material is difficult, to this end; a cutting finite element modelling is required. This study aims initially to model orthogonal cutting of ...
Article dans une revue avec comité de lectureTRABELSI, Sabrine; MOREL, Anne; GERMAIN, Guénaël; BOUAZIZ, Zoubeir (Springer Verlag, 2016)Titanium alloy is well known for its difficulty to machine, owing to the important “tool wear” phenomenon. Machining assistance is an interesting solution to lengthen the tool lifetime. In this study, we focused on the ...