構造用セラミックスの動的及び静的疲労強度とき裂進展

概要

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High temperature static (constant stress loading) and dynamic (constant stress rate loading) fatigue tests were conducted on hot-pressed silicon nitride and sintered silicon carbide in vacuum, and the results were treated by two types of crack growth expressions, power-law and exponential relations. The log-log representation based on the power-law relation for data on the silicon nitride produced the change in slope, suggesting effects of accelerated crack extension by rapid cavity spreading, and the semi-log representation based on the exponential relation resulted in an excellent fit with one straight line. On the other hand, data for the silicon carbide were shown to be better described by both relations. Hence, the superiority of exponential crack growth expression was suggested for life prediction as a consequence.
社団法人日本セラミックス協会の論文
1990-06-01