高速進展開始直後のき裂に対するコウスティック法の適用について

概要

論文の詳細を見る
Crack tip stress fields of cracks propagating at a speed of about 550 m/s are experimentally studied at the time of 18 or 73μs after crack initiation, and the following results are obtained. (1) In the direction along the crack, no effect of higher-order terms appears at either 18 or 73μs after crack initiation, and the singular field is developed as far as 9 mm from the crack tip. Hence, measurement of crack opening displacement always gives the true value of the dynamic stress intensity factor, K. (2) In the direction of 72 degrees from the crack propagation direction, the effect of higher-order terms strongly appears at 18μs after crack initiation, but it disappears at 73μs, and the singular field is developed as far as 5 mm from the tip. It can consequently be said that the higher-order terms affect K measurement by the caustic method if the measurement is carried out within several tens of microseconds after the beginning of rapid crack propagation.
一般社団法人日本機械学会の論文
1993-09-25