第 1 部 (9) 耐熱鋼のクリープき裂成長挙動およびその計算シミュレーション

概要

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Prediction of initiation and growth of creep voids and cracks under multi-axial stress condition is important for the reliability assessment of high temperature structural components. We have reported that the creep crack growth rate increased as the specimen thickness increased due to the three dimensional mechanical constraint effects. We have also reported that the creep crack growth rate could be characterized by creep ductility, whereas it was accelerated due to the creep damages formed ahead of the crack tip. Based on these experimental results, the three dimensional FEM analysis code has been developed. The growth of creep crack is computed based on the critical strain criteria under multi-axial stress condition. In order to analyze the formation and growth of creep damaged zone, the vacancy diffusion equation under multi-axial stress condition is solved. The effect of creep ductility, mechanical constraint and creep damages on creep crack growth properties can be successfully simulated.
社団法人日本機械学会の論文
2003-03-27