LE-7ロケットエンジン主噴射器におけるINCONEL718の非破壊的クリープ疲労損傷余寿命評価

概要

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Nondestructive creep and fatigue life evaluation technology was investigated for INCONEL718 in the LE-7 rocket engine. Metallurgical microstructural change is not considered to be a criterion for life prediction because it is very small in high-stress and short-term creep and fatigue damage processes such as in the LE-7 engine. Crack length observation on the metal surface is the most effective method to estimate damage rate. Correlation of maximum crack length and life consumption rate was shown for the parent metal and welded joint based on the interrupted creep and fatigue test specimen. Furthermore, the analytical life prediction method by means of structural strength analysis and reference material data was checked using notched specimen creep and fatigue test data.
社団法人日本機械学会の論文
1995-08-25