Observation of Crack Growth Behavior of Various Cracks in 4.762mm Diameter Silicon Nitride Balls under Cyclic Compressive Load

Abstract:

In order to investigate the effect of pre-crack lengths on strength of silicon nitride balls under cyclic pressure loads, growth behavior of 600~700μm pre-cracks were compared to those of 200μm~300μm and 400~500μm pre-cracks. Furthermore, the change in initial threshold limit of the maximum stress intensity factor was discussed. It was found that the increasing ratio of stress intensity factor during N=0 and N=1000 distinguished the failure and non-failure, and pre-crack length had strong effect on the threshold limits of the increasing ratio.

• Periodical: Materials Science Forum (Volume 971)
• Pages: 101-105
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.971.101
• Online since: September 2019
• Authors: Takumi Toriki, Tomoya Matsui, Katsuyuki Kida*
• Keywords: Ball, Fatigue Strength, Silicon Nitride, Stress Intensity Factor, Surface Crack

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