This paper presents methods to determine two fracture mechanics parameters using load-deflection curves obtained from an instrumented Charpy test. Two fracture mechanics parameters are dynamic fracture toughness (J//d) and material tearing modulus (T//m//a//t). J//d is fracture resistance at crack initiation and it is necessary to detect the crack initiation point on the load-deflection curve for measurement of this value. On the other hand, T//m//a//t is a parameter to characterize a stable crack growth and it is necessary for this to estimate an amount of crack extension. In this study, it is attempted, for the measurement of J//d, to detect the crack initiation point by calculating the compliance change rate from a loaded-deflection curve. Next, the J- TRIAN OP a curve is estimated by using a key curve method and T//m//a//t is determined from its slope. In addition, T//m//a//t is evaluated by combining Kaiser's rebound compliance with Paris-Hutchinson's T//a//p//p equation. The above results are compared with those of the stop block test (which is a multiple specimens technique). Rather good agreement is ascertained.
|ジャーナル||Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan|
|出版ステータス||Published - 1985 1 1|
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