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Finite element analysis on the application of Mini-C(T) test specimens for fracture toughness evaluation

破壊靭性試験へのMini-CTの適用性に関する有限要素解析

高見澤 悠 ; 飛田 徹; 大津 拓与; 勝山 仁哉 ; 西山 裕孝 ; 鬼沢 邦雄 

Takamizawa, Hisashi; Tobita, Toru; Otsu, Takuyo; Katsuyama, Jinya; Nishiyama, Yutaka; Onizawa, Kunio

使用済み監視試験片から採取可能なミニチュアコンパクトテンション(CT)試験片を用いたマスターカーブ法による破壊靭性評価が提案されている。CT試験片及び、予亀裂付シャルピー試験片の寸法や形状の違いによる亀裂先端の拘束効果への影響について有限要素解析を行った。ミニチュアCT試験片における拘束効果を拘束の程度を示すパラメータであるT応力,Qパラメータを用いて評価したところ、他のCT試験片とで大きな違いは見られなかった。ミニチュアCT試験片の予亀裂導入条件についても解析を行い、既往規定より短い予亀裂長さとしても破壊靭性試験に影響しないことを明らかにした。また、ミニチュアCT試験片を用いたマスターカーブ法に基づく破壊靭性評価で得られる参照温度が他の試験片から得られる結果と相違ないことを示した。

Fracture toughness evaluation by the Master Curve method using miniature compact tension (Mini-C(T)) specimens taken from the broken halves of surveillance Charpy specimens has been proposed. We performed finite element analysis (FEA) to examine the difference in constraint effect of the crack tip for the different size C(T) and precracked Charpy v-notch specimens. The constraint effect for Mini-C(T) specimens in terms of the T-stress and Q-parameter was similar to the larger C(T) specimens. To optimize the fatigue precracking conditions for the Mini-C(T) specimen fabrication, plastic zone distribution analysis was performed. We confirmed the fatigue precrack length and the availability of the mitigated crack shape for Mini-C(T). We also obtained the fracture toughness data for different sizes specimen. It was shown that To obtained from the Mini-C(T) specimens is in reasonably good agreement with that from others. We compared the fracture toughness data with T41J based fracture toughness curves proposed in recent study. All of the data were well enveloped by the proposed lower bound curve.

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