圧電素子を利用した疲労き裂伝播挙動の計測について

概要

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The evaluated methods for propagation behavior of fatigue crack had been proposed with consideration opening and closure of crack tip. To consider acceleration and deceleration of crack propagation rate, it is necessary to use effective loading range to the maximum load from closure load or RPG load of crack tip. In this paper, for health monitoring of welded steel structures, we investigate the automatic measurement method of closure load or RPG load using general digital type dynamic strain meter and piezoelectric ceramics. As results of this study, the following conclusions are obtained; (1) The piezoelectric ceramics is very effective and high sensitive for monitoring of propagation behavior on fatigue crack. (2) We propose the method of evaluation to obtain crack closure load and RPG load using piezoelectric ceramics when the load can not be measured.
社団法人日本船舶海洋工学会の論文
2000-09-04