328 多結晶体有限要素モデルによる粒界応力腐食割れの発生・成長評価(OS10-1 応力腐食割れ,減肉配管,OS10 エネルギー機器の経年変化に関する健全性評価手法の開発とその適用(1))

概要

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In this study, initiation and growth of intergranular stress corrosion cracking was evaluated by a Monte Carlo simulation. A three-dimensional polycrystalline body was generated by Voronoi tessellation. The effect of stress concentration around pre-existing cracks was taken into account by applying the finite element method. Initiation and propagation of the cracks were modeled based on concepts of damage mechanics. The simulation could reproduce cracking behavior observed in the experiment. Increase in number of cracks was saturated and was followed by decrease as experimentally observed. This caused by preferential crack initiation at the stress-concentration zones and suppression of crack initiation in stress-shielding zones. It was concluded that the local stress brought about by pre-existing cracks plays an important role in the initiation and growth of cracks, and the simulation could imitate the cracking behavior under interaction.
一般社団法人日本機械学会の論文
2007-10-24