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Two-dimensional stress corrosion cracking model for reactor structural materials

原子炉材料のための2次元応力腐食割れモデル

五十嵐 誉廣 ; 三輪 幸夫; 加治 芳行 ; 塚田 隆 

Igarashi, Takahiro; Miwa, Yukio; Kaji, Yoshiyuki; Tsukada, Takashi

粒界型応力腐食割れ(IGSCC)の分岐き裂を再現するための2次元IGSCCモデルの開発を行った。本モデルでは、IGSCCの進展傾向に重要な影響を与えると考えられる、粒界腐食,粒界に作用するせん断応力の影響、そして粒界強度の因子を考慮してIGSCCを進展させる。本モデルを用いて、幾つかの荷重条件,せん断応力条件におけるき裂進展シミュレーションを行った。結果、き裂分岐の原因は粒界に作用するせん断応力の影響であること、そしてIGSCCに特異的に見られる、荷重方向に対し斜め方向へのき裂進展の原因は、せん断応力と粒界腐食の相乗的影響であることがわかった。

The two-dimensional intergranular stress corrosion cracking (IGSCC) growth model has been developed to simulate branching cracks of IGSCC. In the model, the IGSCC is grown using the "grain-scaled" factors such as the length and strength of grain boundary and so on. Especially, the corrosion of grain boundary and the influence of shear stress acting on the grain boundary are introduced in the model. Using the model, computer simulation of crack growth was carried out under several load conditions with changing the ratio of axial to shear stress against the grain boundary. As a result of the simulations, we found out that the cause of crack branching was the influence of shear stress against the grain boundary, and that the synergistic effect of shear stress and corrosion of grain boundary leads to the oblique crack growth.

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