721 セラミックボールの接触荷重に対する破壊力学的検討(GS.A 先端材料の破壊と強度)

概要

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The quantitative estimation is required since the fatal defect called a ring crack will occur when a ceramic ball is used for ceramic bearing. We considered the application of stress intensity factor and effective volume by performing FEM analysis and the contact examination of balls. As the results, it did not depend on ball size for the scatter of ring crack initiation load, and it was clarified that a ring crack progressed aslant to the ball surface. The stress intensity factor was discussed based on these results. It was clearly showed that the crack length involved in the formation of a ring crack was approximately 1.5μm, without dependence of ball size. This analytical result is well agreement with an experimental result. Therefore, it was proved theoretically that it is not necessary to consider the influence of effective volume in ring crack initiation of a ball.
一般社団法人日本機械学会の論文
2007-10-24