Abstract
In order to clarify the fracture behaviors of nanocomposite ceramics under ultrasonic vibration–aided grinding, the stress under ultrasonic was analyzed by non-local elastic theory. A similarity model of bending fracture experiment was built to allow online observation of fracture process, according to the actual conditions of fracture damage under ultrasonic vibration–aided grinding and the similarity law. The experiments validated the theoretical analysis: as the ultrasonic frequency increases, fatigue life is distinctively shorter, and the fatigue crack extends faster and is more stable; the deflection angle decreases as the ultrasonic frequency increases, and it is biggest (47.53°) under 19.9 kHz; the phase transition occurs in the fracture process and the amount of phase transformation increases with the increase in ultrasonic frequency and zirconia content, and it can reach the maximum value when the zirconia content is about 25% and then declines; the greater the ultrasonic frequency, the more obvious the transgranular fracture, the more microcracks on the crystal layers, and the more smooth the fracture surface.
Highlights
Nanocomposite ceramics possess ascendant mechanical properties and physical characteristics, including high strength at elevated temperatures, low thermal expansion, good wear resistance, chemical inertness, and more.[1]
This study aims to get a better understanding of the effects of excited ultrasound on the fracture behaviors and reveal the precise and efficient features of ultrasonic vibration–aided grinding of nanocomposite ceramics
A similarity model of the bending fracture experiment was developed for clarifying the fracture behaviors of the nanocomposite ceramics under ultrasonic vibration–aided grinding
Summary
Nanocomposite ceramics possess ascendant mechanical properties and physical characteristics, including high strength at elevated temperatures, low thermal expansion, good wear resistance, chemical inertness, and more.[1] They have become a research focus in application fields such as the military industry, aerospace, precise instruments, and the machine-tool industry. In order to create a cost-effective machining process, many efficiency and ultra-precision machining methods were studied by many researchers for ceramics, including pre-stressed machining, electrolytic in-process dressing (ELID) grinding, magnetic abrasive polishing, and ultrasonic vibration–aided grinding.[3,4,5,6,7] Currently, ultrasonic vibration–aided grinding is considered a high maturity method among these methods, and the effects of School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China
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