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- 저자 : Shiliang Wei (검색결과 3 건)
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Simulation Study on Removal Mechanism of Si3N4 Ceramic in Rotary Ultrasonic Grinding
Shiliang Wei,Tao Zhang,Hengju Wei,Wei Wang,Haiyang Wang,Youdi Liu 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.6
Hot-pressed Si3N4 ceramic is a kind of high-performance ceramic material, which is widely used in national defense, aerospace, and other professional fields. Aiming at the problem of poor surface quality of Si3N4 ceramic material, the paper carried out a simulation study on the removal mechanism of Si3N4 ceramic by rotary ultrasonic grinding. The study provides a theoretical basis for improving the surface quality and processing efficiency of hot-pressed Si3N4 ceramics. Combined with dynamic simulation software to complete single abrasive and double abrasive rotary ultrasonic grinding simulation. Material removal and surface crack propagation in single and double abrasive grains rotary ultrasonic grinding of Si3N4 ceramic were analyzed by crack propagation theory. The grinding force of Si3N4 ceramics with different ultrasonic amplitude and grinding depth and the local stress change at the time of crack generation with different ultrasonic amplitude were compared and analyzed. Complete single abrasive and double abrasive rotary ultrasonic scratch test. The grinding force and surface crack generation obtained by rotary ultrasonic scratch test and rotary ultrasonic grinding simulation were analyzed. The maximum error of the simulation results of single-grain and double-grain rotary ultrasonic grinding is 12.8% and 14.7% respectively. The surface crack of the scratch test workpiece is consistent with the simulation results.
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The Effect of Polypropylene Fiber and Glass Fiber on the Frost Resistance of Desert Sand Concrete
Lina Hou,Shiliang Jian,Wei Huang 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.1
To study the influence of polypropylene (PP) fibers and glass fibers on the frost resistance of desert sand concrete (DSC), the fast-freezing tests were carried out to investigate the freeze-thaw damage law using the apparent damage, mass loss, and relative dynamic elastic modulus as indicators; Based on the mercury intrusion method (MIP) and scanning electron microscopy (SEM), the microstructure evolution was analyzed to reveal the mechanism of fiber frost resistance enhancement. Fit the freeze-thaw damage process of fiber reinforced DSC (FRDSC) and predict the frost resistance life. The results show that fibers can greatly improve the freezing resistance of DSC. The hybrid fiber had the highest enhancing effect, followed by PP fiber and glass fiber. The dynamic elastic modulus of the DSC with 0.15% PP fiber and 0.05% glass fiber is as high as 95%. The pore distribution ratio of FRDSC changes faster, but it is still better than that of reference DSC after freeze-thaw. PP fiber and glass fiber can play a full role in the micro and macro stages of crack development of DSC respectively. The freeze-thaw damage model has high fitting accuracy and the DSC mixed with fibers can significantly improve the service life of buildings in northern China.
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