窒化けい素の室温保証試験後の打ち切り強度と高温強度特性

概要

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To estimate the truncation strength of silicon nitride after proof testing, the crack growth behavior was studied using a semi-circular surface crack induced by a Knoop indenter. Assuming that the relation between the arack growth velocity, V, and the stress intensity factor, K, is merely composed of two regions (Region I and Region II) , the transition stress intensity factor value from Region I to Region II, K was predicted from the crack propagation parameter, A, n, and the fracture toughness, K_<IC>. Using the relation between V and K obtained, the truncation strength of silicon nitride proof-tested at room temperature was entimated. Further more, the fast fracture strength and the static fatigue life were measured at elevated temperature, and the effectiveness of proof testing was investigated.
一般社団法人日本機械学会の論文
1993-01-25