INCONEL718溶接継手構造モデル試験および解析によるLE-7ロケットエンジン主噴射器のクリープ疲労損傷評価

概要

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An LE-7 rocket engine main injector is subjected to both internal pressure stress and high thermal stress due to large temperature difference between the fuel manifold (600℃) and LOX dome (-180℃). Therefore thermal ratchetting was considered to be one of the problems. A failure-mode simulation test was conducted using the structure model of an INCONEL718 welded joint, which ended with cracking of the weldment after 70 cycles of axial mechanical load and thermal load. Measured accumulated strain was smaller than that estimated from Bree's ratchetting diagram. Elastic-plastic thermal analysis showed a fairly good agreement between estimated life and test result, and this failure mode was due to mainly creep damage. It is confirmed that the thermal ratchetting effect on this failure mode is negligible, and the analytical method of creep-fatigue life evaluation is adequate for the prediction of structure life.
社団法人日本機械学会の論文
1995-08-25