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In this paper,we attempts to investigate cutting mechanisms in high-speed cutting of Al6061/SiCp/15p composites using a semi-phenomenologically based damage model in the equiva-lent homogeneous material (EHM) framework.By combining macroscale EHM modeling and underlying microscale physical mechanisms,a feasible semi-phenomenological plastic model is pro-posed for prediction of cutting forces and chip morphology during high-speed turning Al6061/SiCp/15p composites.This model incorporates the modified Weibull weakest-link effect to represent the strain-based damage evolution in large deformations.This proposed semi-phenomenological constitutive model is implemented by compiling material subroutines into cutting finite element(FE) codes.The effects of the critical shear stresses on chip formation that depend on the tool-chip frictional coefficient are accounted for in the cutting FE model.The chip formation mechanism affecting material removal behaviors during high-speed turning is further investigated.The capabil-ities of the proposed constitutive model are evaluated by comparing cutting forces and chip mor-phologies between experiments and simulations at different cutting speeds associated with strain rates.The EHM-based and microstructure-based models are further compared in both computa-tional efficiency and accuracy.The simulation results show that the developed semi-phenomenological constitutive formalism and cutting model are promising and efficient tools for further investigation of dynamic mechanical and cutting behaviors of particle-reinforced composites with different volume fraction and particle size.