کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1585418 | 1514919 | 2006 | 7 صفحه PDF | دانلود رایگان |
In this study, the collapsing loads of cavitation bubbles generated by an ultrasonic vibratory device have been quantitatively evaluated for the as-casted and flame-quenched Cu–8.8Al–4.5Ni–4.5Fe (Al–bronze) alloys and their effects on the surface pitting after a short cavitation exposure have been numerically studied. The cavitation bubble collapsing loads were determined by measuring the cavitation pulse signal (Vout) and converting it into the impact load (F) by a ball drop test. A linear relation (F = A′Vout) between Vout and F was established with a different slope of A′ for both materials. According to the impact load measurements, the flame-quenched Al–bronze underwent lower impact intensities compared to the as-cast one. For the flame-quenched Al–bronze the critical impact load (Lc) required to form a pit more than 5 μm (minimum observable size) was 12.9–13.5 N which is slightly lower compared to that of the as-casted Al–bronze (13–13.8 N). The cavitation bubbles with the impact load value above Lc were very small, suggesting that the cavitation erosion leading a significant material loss is due to the surface fatigue by cumulative small impact loads.
Journal: Materials Science and Engineering: A - Volume 425, Issues 1–2, 15 June 2006, Pages 15–21