Optimizing amplitude to improve machined surface quality in longitudinal ultrasonic vibration-assisted side milling 2.5D C/SiC composites

Fiber debonding pit badly affects the machined surface quality of carbon fiber reinforced silicon carbide matrix (C/SiC) composites. The longitudinal ultrasonic vibration-assisted side milling (UVAM) is applied to C/SiC machining in this paper. The fiber debonding pit damage is aimed to be suppressed by optimizing the UVAM amplitude. The fiber debonding depth prediction (FDDP) model is proposed based on the deformation and fracture behavior of carbon fiber during UVAM C/SiC composites, and the optimum UVAM amplitude in machining C/SiC composites can be obtained. The experimental results of UVAM C/SiC composites prove that the amplitude value obtained by the proposed FDDP model can significantly reduce the defects induced by fiber debonding pit.