Simulating process of abrasive impacting a workpiece surface based on SPH method

Taking Johnson-Holmquist ceramic brittle material constitutive model as an analysis foundation, the process of crack formation and extension in rotary ultrasonic machining was firstly simulated by means of the smoothed particle hydrodynamics method. The simulation results showed that the tensile stress generated by abrasive impacts is the main cause for crack formation; also, the occurrence of impact crack is advantageous to reducing the depth of subsurface cracks and improving the surface quality in fundamental; the generation of impact cracks and subsurface cracks is beneficial to reduction of cutting force; and the phenomenon of local micro-impact leads to the main cutting force fluctuating in a wide range. The results of scratching tests conducted by Conway verified the feasibility of SPH method in simulation of crack propagation.