High temperature life prediction of a welded IN718 component

D. W. J. Tanner*, A. A. Becker, T. H. Hyde

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)


Life predictions from a case study of a welded feature in a generic spoke structure, determined using three-dimensional quasi-static elastic-plastic and creep finite element analyses, are demonstrated. The complete structure consists of multiple Inconel 718 (IN718) TIG-welded features; the welds exhibit noticeably depleted mechanical properties so a multi-material analysis is necessary for accurate predictions. The effect the welds have on the life is investigated for both constant (creep) and cyclic loading (creep-fatigue) conditions at 620 degrees C. Creep damage and Smith, Watson and Topper (SWT) strain parameter lifing methods are used, based upon material properties determined using uniaxial test data. The lower fatigue properties of the welded IN718 material at high temperature had a negative effect on the fatigue life of the structure. The effect of the weld on the life under constant loading at high temperature was found to be more difficult to evaluate due to significant stress relaxation.

Original languageEnglish
Article number012027
Number of pages8
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2009
Event7th International Conference on Modern Practice in Stress and Vibration Analysis - Cambridge, United Kingdom
Duration: 8 Sep 200910 Sep 2009




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