安定き裂成長を伴う場合のムライトの破壊じん性評価

概要

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Sometimes in ceramics remarkable slow crack growth appears even at room temperature and in air. The evaluation of fractture toughness in Such a case is one of the most important problems for the development and practical use of ceramics. This paper deals with the case of mullite. Two kinds of mullite were tested by using the precracked and chevron-notched specimens at room temperature and in air. Especially in the chevron-notched specimens, remarkable slow crack growth was detected. The compliance method obtained from the notch mouth opeIling displacement gave the slow crac kgrowth quantatively and the acoustic emission measurement indicated that qualitatively. The fracture toughess obtained from the three point bending tests was evaluated from the viewpoint of the material resistance againsts low crack growth.
社団法人日本材料学会の論文
1991-04-15