Material Model Application Considering Strain Softening for Cutting Simulation of 11-6Al-4V Alloy and Its Experimental Validation

Titanium alloys are widely applied to the aerospace and bio component industries due to their good properties such as high specific strength, low density, chemical stability, etc. However, they are representative difficult-to-machine materials which cause the deterioration the cut quality and tool lifetime due to the local temperature increase, generation of serrated chips and large amplitude modulation in cutting force during their cutting. Accordingly, the cutting simulation of titanium alloys is necessary to improve machining characteristics. This study analyzed limits of Johnson-Cook material model which is widely applied to the finite elements method for the cutting simulation of titanium alloys, and carried out simulation where the supplemented Johnson-Cook material model is applied. Validation is also carried out by analyzing cutting force and chip shape which were obtained from experiments for the purpose of validation on such simulation results.