• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (13): 290-297.doi: 10.3901/JME.2022.13.290

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Study on Interfacial Bonding Strength of C/SiC after Rotary Ultrasonic Milling

LI Saichao, ZHENG Kan, XUE Feng, SHU Jing   

  1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094
  • Received:2021-07-11 Revised:2022-04-08 Online:2022-07-05 Published:2022-09-13

Abstract: To solve the problem that fatigue strength of C/SiC composite is greatly reduced after machining,an anti-fatigue machining method based on rotary ultrasonic machining is proposed. Based on shear lag theory, a theoretical model between ultrasonic amplitude and interfacial bonding strength of C/SiC is established. Weakening mechanism of ultrasonic vibration on interfacial bonding strength is clarified. Fatigue reinforcement effect of rotary ultrasonic machining is verified by static tensile test, residual stress measurement, and fatigue experiment and fracture morphology observation. The experimental results showed that C/SiC tensile strength and surface residual compressive stress are increased significantly by high-frequency percussion. Debonding stress and interfacial bonding strength of fiber matrix are reduced effectively. Fiber toughening effect is remarkable. Compared with conventional machining, tensile strength and fatigue strength are increased by 17.5% and 9.4% respectively.

Key words: rotary ultrasonic milling, interfacial bonding strength, C/SiC composites, fatigue strength, residual compressive stress

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