腐食容器と人工欠陥容器の欠陥評価

概要

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Fracture tests by hydraulic pressure were performed on corroded and/or artificially flawed closed cylindrical-vessels as well as similar new vessels. Critical pressure for plastic collapse of all the vessels was predicted reasonably by equation that assumed a thin thickness with strain hardening material. When the fracture occurred independent of existing flaws of the vessels, fracture pressure was predicted by the above equation and the values were the same with those for sound vessels. When the fracture originated at flaws of the vessels, fracture pressure was predicted conservatively by an equation that assumed local plastic collapse for an axial surface crack on a cylinder. The results revealed the condition for leak before burst (LBB). Fatigue life of corroded and/or flawed vessels was predicted based on the above results for fatigue crack growth and final plastic collapse evaluated by fracture mechanics. The prediction suggested that corrosion thinning up to one eighth of thickness of vessels was safe, while one up to half thickness could be allowed with careful attention.
社団法人日本機械学会の論文
2001-10-25