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Effects of the Loading Rate and Humidity in the Fracture Toughness Testing of Alumina
조성재,윤경진,이홍림,Jai-Chun Kim,Min-Cheol Chu,Yoon-Cheol Lee,George Quinn 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.1
To test the fracture toughness of alumina, a surface-crack-in-flexure (SCF) method, a single-edge-precracked-beam (SEPB) method and a single-edge-V-notched-beam (SEVNB) method were used at crosshead rates ranging from 0.005 mm/min to 2mm/min and relative humidity ranging from 15% to 80%. The results show that the fracture toughness tested by the SCF method increases with either an increasing loading rate or decreasing relative humidity; in contrast, the toughness by the SEPB method and the SEVNB method does not depend on the loading rate or the relative humidity. Theoretical analysis of the way slow crack growth affects the apparent fracture toughness indicates that the three testing methods have different effects with respect to the loading rate and the relative humidity; moreover, these differences are attributable to differences in the size of the cracks or notches.
Effects of the Loading Rate and Humidity in the Fracture Toughness Testing of Alumina
Cho, Seong-Jai,Kim, Jai-Chun,Yoon, Kyung-Jin,Chu, Min-Cheol,Lee, Yoon-Cheol,Quinn George,Lee, Hong-Lim The Korean Ceramic Society 2006 한국세라믹학회지 Vol.43 No.1
To test the fracture toughness of alumina; a Surface-Crack-in-Flexure (SCF) method, a Single-Edge-Precracked-Beam (SEPB) method and a Single-Edge-V-Notched-Beam (SEVNB) method were used at crosshead rates ranging from 0.005 mm/min to 2 mm/ min and relative humidity ranging from $15\%\;to\;80\%$. The results show that the fracture toughness tested by the SCF method increases with either an increasing loading rate or decreasing relative humidity; in contrast, the toughness by the SEPB method and the SEVNB method does not depend on the loading rate or the relative humidity. Theoretical analysis of the way slow crack growth affects the apparent fracture toughness indicates that the three testing methods have different effects with respect to the loading rate and the relative humidity; moreover, these differences are attributable to differences in the size of the cracks or notches.