LE-7ロケットエンジン主噴射器におけるINCONEL718溶接継手の熱衝撃疲労試験

概要

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A thermal shock fatigue test was conducted as a part of low cycle fatigue life evaluation of the INCONEL718 welded joint in the LE-7 rocket engine main injector. It was revealed that specimen thermal shock fatigue test data were in agreement with standard low cycle fatigue test data. Thus thermal shock fatigue life, which is determined predominantly by thermal bending stress, can be analyzed and evaluated appropriately by the same method which is used for low cycle fatigue life evaluation under the control of membrane stress. Application of high-temperature solution heat treatment after welding improved low cycle fatigue life of the welded joint as well as ductility and toughness. Another thermal shock fatigue test of a structural model, which was exposed to thermal stress as large as the actual main injector, showed longer fatigue life than required.
社団法人日本機械学会の論文
1995-08-25