Abstract
Elastic-plastic FEM (finite element method) simulation is carried out in order to elucidate the chip formation mechanism from the viewpoint of the ductile fracture. The constitutive equation of ductile fracture based on Gurson's yield function is used, and the chip formation process is simulated continuously from the initial state to the steady state. The chip formation process of S 45 C steel is simulated, and the simulation results are compared with the results of a cutting experiment which is conducted by means of in-situ SEM (scanning electron microscope) observation. The results of the simulated chip formation process including those of chip morphology, shear angle, and specific cutting force are in good agreement with the results of the cutting experiment. The distribution of the void fraction is calculated, and the possibility of simulation of discontinuous chip formation due to ductile fracture is also discussed.
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