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

Katsuyuki Kida; Junnosuke Koga; Edson Costa Santos; Takashi Honda

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

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 217-218Effect of Frequency on Fatigue Cracks of Silicon...

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.