MACHINING MODEL OF TI-6AL-4V TITANIUM ALLOY USINGFEM SIMULATION

This paperpresents a machining modelof Ti-6Al-4V titanium alloy using finite element method (FEM) simulation. The constitutive Johnson–Cook material flow stress was employed to predict material plasticity, chip morphology, cutting forces and stress distribution. Comparative analysis for both simulation and experimental data were carried out. The simulated results show that workpiece material flow around the cutting edge of the tool and deposited themselves to form a continuous curl chip formation. The stress distribution generated in the shearing plane during steady state conditions and the residual stress is formed beneath the machined surface.The cuttingforces were essentially constant across the range of cutting speeds. This agreedwith the trend from the experimental trials

Investigation of Effects of Carbon Nanofiber Nanofluid in Drilling of AISI 304 Stainless Steel

This paper presents the experimental study of the effects of carbon nanofiber (CNF) nanofluid in drilling of AISI 304 stainless steel. The drilling performance was assessed based on the surface roughness inside the holes, hole dimensional accuracy and burr formation using four different CNF nanofluid concentrations. The machining performance of CNF nanofluid also compared with the base fluid (deionized water) only. The experimental results show that the CNF nanofluid not only improve the surface finish and hole accuracy, but also reduce the burr formation at the circumference of the drilled hole