Abstract: Through the modification of constitutive model， finite element simulation， optimization of genetic algorithm， numerical simulations and experimental， the law of cutting force was studied in turning ceramics. Based on finite element simulation， chip formation mechanism indicates the chip was continuous layered applying classical Johnson-Cook model， and it did not accord with cutting experiment. After improving the model， the chip was crack-chip in the finite element simulation， and it was applicable for cutting ceramics. Based on least squares method， the monadic regression was carried out according to simulation data of simple single factor， and the analytical equation was obtained on cutting force with changing a single parameter. Correlation coefficient test indicated that the precision of improved model was high. The multivariate model of cutting force was established by genetic optimization algorithm. The multivariate model was verified by single factor and orthogonal tests， and the results indicated the model was accurate to present the law of cutting force and reliable.

Key words: cutting force, numerical simulation, genetic algorithm, finite element simulation, turning, engineering ceramics