Study on Material Damage Mechanism and Surface Quality of C/SiC Composites by Laser-ultrasonic Hybrid Micromachining
C/SiC composites have excellent mechanical and mechanical properties such as high specific strength,low density,low thermal expansion coefficient,wear resistance,high temperature resistance,etc.,and are widely used in aerospace,national defense,electronics and other fields.However,due to its special organizational structure and material characteristics,it is easy to produce damage or defects such as fiber pulling out,micro-crack expansion,and crushing during processing,which directly leads to fast tool wear,low processing accuracy,and poor surface quality,and seriously restricts the performance of high-end equipment.The damage mechanism and surface quality of C/SiC composites in laser-ultrasonic hybrid micromachining(L-UHM)are studied.The failure mechanism of C/SiC composites under laser ultrasound is analyzed,and conventional machining(CM),laser assisted machining(LAM)and L-UHM micro-cutting models are established based on the orthogonal cutting model.The removal mechanism of fiber phase and SiC matrix phase under three typical fiber directions in CM,LAM and L-UHM is revealed,and the micro-morphology and surface roughness under different fiber directions are evaluated.The results show that the surface quality along the fiber direction in L-UHM is 10.1％higher than that in LAM,which proves the correctness of the theoretical analysis.
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