Numerical Analysis of the Influence of Johnson-Cook-Material Parameters on the Surface Integrity of Ti-6Al-4 V

During machining metals the material of the work piece is highly deformed and heated, which influences surface integrity. To simulate the machining process the thermo-mechanical material behavior in dependence of strain, strain rate and temperature has to be well known. One of the most used material models is the Johnson-Cook-Model, where the material dependent parameters are determined by Split-Hopkinson pressure bar tests. For the titanium alloy Ti-6Al-4 V used for the simulations different investigations with the goal of determining material parameters have been published. However, the presented results vary significantly. It is expected that these varying parameters result in different predictions of surface integrity after machining. This influence is investigated by machining simulations using a self-developed continuous remeshing method.