ANALYSIS OF SHEAR ANGLE AND PLASTIC DEFORMATION IN TURNING OF Ti-6Al-4V TITANIUM ALLOY AT ELEVATED TEMPERATURES
DOI:
https://doi.org/10.34185/1991-7848.itmm.2026.01.009Keywords:
Ti-6Al-4V, titanium alloy, shear angle, numerical simulation, DEFORM-2D, Johnson–Cook model, orthogonal cutting, plastic deformation, workpiece temperature, cutting speedAbstract
This study investigates the shear angle and plastic deformation during the turning of Ti-6Al-4V titanium alloy under conditions of workpiece preheating from 20 to 700 °C. Using DEFORM-2D simulation with the Johnson–Cook constitutive model, it was established that increasing the temperature promotes thermal softening of the material and reduces shear resistance.
The simulation results demonstrate a gradual increase in the average shear angle from 34° to 36.2° with increasing cutting speed and temperature, particularly in the 700 °C range. It was found that at the steady-state stage, the shear angle stabilizes because the temperature in the cutting zone reaches 800–900 °C due to intense deformation and friction. Preheating to 500 °C provides a more stable transition to the quasi-steady-state regime compared to machining at room temperature. Analysis of the total (effective) plastic strain showed its relative stability, confirming the dominant influence of process kinematics and tool geometry on this parameter.
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