原子炉圧力容器用鋼 A508cl.3 鋼の静的および動的弾塑性破壊靱性試験における試験片寸法の影響

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The fracture toughness must be evaluated under the dynamic loading condition, when the materials are used for structures which are desired to a higher safety and must be taken into account of the effect of dynamic loading. Moreover, in order to obtain the valid J_<IC> value, a criterion about both specimen thickness B and ligament width b_0 must be satisfied, which is called as "valid condition" and is described in the following equation. B, b_0≥α(J_<in>/σ_<fs>), (α=25) However, this equation is presented in the case of static loading and there is no assurance to be able to apply in the case of dynamic loading. Therefore, under static and dynamic loading conditions, the effects of both B and b_0 on J_<in> value and the flow stress σ_<fs> are investigated and the valid conditions are discussed. The results are presented that the factor α of the above equation is reduced as α=20 about b_0 and is increased as α=28 about B under dynamic loading condition.
社団法人日本鉄鋼協会の論文
1994-08-01