計装化シャルピー試験法による動的弾塑性破壊靱性特性値の評価

概要

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This paper presents methods to determine two fracture mechanics parameters using load-deflection curve obtained from instrumented Charpy test. Two fracture mechanics parameters are dynamic fracture toughness (J_d) and material tearing modulus (T_<mat>). 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_<mat> 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 loaddeflection curve. Next, J-⊿a curve is estimated by using a key curve method and T_<mat> is determined from its slope. In addition, T_<mat> is evaluated by combining KAISER's rebound compliance with PARIS-HUTCHINSON's T_<app> equation. The above results are compared with the ones of stop block test (which is a multiple specimens technique), and are discussed about those validity ; a rather good agreement is ascertained.
社団法人日本鉄鋼協会の論文
1985-12-01