静的および衝撃三点曲げ試験によるアルミナの破壊じん性評価

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The static and impact three point bending tests were carried out to evaluate the fracture toughness of alumina. A precrack was introduced into the specimen by BI method. In order to elimiflate the influence of residual stress caused by the roughrless of the crack surface, a notch was made on the crack with diamond cutter, leaving the crack tip. The static fracture toughness was evaluated by SEPB method. Because of rising R-Cur Vebehavior of alumiIla, the fracture tough Inesscalculated from the maximum load would be greater than the in berent on In this experiment, the fracture toughness was calculated from the load attbeon Set Of crack extension, which was detected by the output of a strain gage glued near the crack tip. This value was almost the same as the fracture toughness obtained by IF method. In addition, the relationn between load and strain near the crack tip observed in the static three point bending test was explained by using as imple mode1. In the impact three point bending test, the impact forces were loaded on the specimen by drop pirlg a cylindrical bar from various heights. It was found that the fracture totlgbness had a tendency to increase with an increase of impact velocity. Furtbermore, the time variation of dynamics tres sintensity factor measured irl this test was compared with the calculated value by a simple evaluating method which was proposed in the previous paper. As aresult, botb values showed good agreement until the crack began to extend.
社団法人日本材料学会の論文
1991-04-15

静的および衝撃三点曲げ試験によるアルミナの破壊じん性評価

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