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Vol.44, No.5, 350 ~ 359, 2006
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| Title |
| Investigation of the Impact Load and Erosive Pit Damage on the SUS316 and 8.8Al-bronze alloys by Cavitation Bubble Collapse |
| 이민구 Min Ku Lee , 홍성모 Sung Mo Hong , 김광호 Gwang Ho Kim , 이창규 Chang Kyu Rhee |
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| Abstract |
| The impact loads of cavitation bubbles generated by ultrasonic vibratory device and their effects on the surface damage have been quantitatively evaluated for the 8.8Al-bronze, flame-quenched 8.8Al-bronze and SUS316 alloys. The cavitation impact loads were determined by calibrating the cavitation pulses through a steel ball drop test, and a linear relation between the cavitation pulse height and the impact load was established for each materials. The measured impact loads and frequency under the cavitation bubble collapse were correlated to the size and number of the pit formed on the surface by assuming that an individual pit is generated by a single collapse of bubble. The critical impact load Le required to form the pits (more than 5 μm) on the flame-quenched 8.8Al-bronze was 13.16N that is lower compared to those of the 8.8Al-bronze (13.33N) and SUS316 (13.9N) alloys. The very small amounts of cavitation bubbles were involved in the formation of pits, which were only 0.89~4.32%, 0.45~1.84% and 4.07~6.87% for the 8.8Al-bronze, flame quenched 8.8Al-bronze and SUS316 alloys, respectively. |
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| Key Words |
| Cavitation, Impact Load, Erosion, 8.8Al-bronze, SUS316, Pit |
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