Effect of Frequency on Fatigue Cracks of Silicon Nitride Balls under Cyclic Loads

Abstract:

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In the previous work, we found that the tensile stress occurring around the equator of the ball caused fatigue of the ball itself. Four groups of pre-cracks, whose surface lengths were 140μm, 220μm, 550μm and 700μm, were initiated on ball surfaces and the strength of these pre-cracked balls was measured. The static strengths and fatigue limits of all pre-cracked balls decreased with crack sizes. We concluded that the fatigue caused by a pre-crack located on the equator of the ball surface was important for understanding fatigue of silicon nitride balls. In the present work, carrying out fatigue tests of pre-cracked balls with 220μm cracks at three frequencies (5Hz, 20Hz and 35Hz) we found that the frequency had effect on speeds of the crack growths.

Info:

Periodical:

Advanced Materials Research (Volumes 217-218)

Edited by:

Zhou Mark

Pages:

874-879

DOI:

10.4028/www.scientific.net/AMR.217-218.874

Citation:

K. Kida et al., "Effect of Frequency on Fatigue Cracks of Silicon Nitride Balls under Cyclic Loads", Advanced Materials Research, Vols. 217-218, pp. 874-879, 2011

Online since:

March 2011

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Price:

$35.00

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