Ultrasonic assisted grinding force model considering anisotropy of SiCf/SiC composites

Abstract

The modeling of ultrasonic assisted grinding (UAG) force for ceramic matrix composites (CMCs) is extremely complex due to the heterogeneous and anisotropic characteristics, further limiting the in-depth comprehension of the UAG mechanism of CMCs. In this paper, the grinding force prediction model of SiCf/SiC composites in UAG was proposed, which has taken into account the anisotropic and heterogeneous characteristics of SiCf/SiC composites and the interaction state of grain and material. According to the results, the multi-scale elastic mechanical model and equivalent fracture toughness proposed in this study can be well applied in the ultrasonic assisted grinding force modeling of ceramic matrix composites. And the normal and tangential grinding forces are predicted with an average error of 9.29%, 6.16%, respectively. In addition, the grinding force exhibits a significant correlation with fiber orientation. It is attributed to the fact that the fiber orientation influences the crack propagation path; meanwhile, the complex and diverse crack propagation paths make the degree of fluctuation of grinding force and the energy required for material removal varied along different fiber orientations, which consequently affects the grinding force magnitude along different fiber orientations.