Paper Title:
Effect of Frequency on Fatigue Cracks of Silicon Nitride Balls under Cyclic Loads
  Abstract

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, J. Koga, E. C. Santos, T. Honda, "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
$32.00
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