Failure estimation of TIG butt-welded Inco718 sheets at 620 °C under creep and plasticity conditions |
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| Affiliation: | 1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China;2. Department of Engineering Mechanics, AML, Tsinghua University, Beijing 100084, China;3. Institute of Mechanics, Chinese Academy of Sciences, China;4. University of South Carolina, 300 Main Street, Room A123, Columbia, SC 29208, USA;1. European Commission, DG-JRC, Institute for Energy and Transport, P.O. Box 2, NL-1755 ZG Petten, The Netherlands;2. Jo?ef Stefan Institute, Reactor Engineering Division, Jamova cesta 39, SI-1000 Ljubljana, Slovenia;1. Laboratoire de Chimie Physique, Université 08 Mai 45, BP401, Guelma 24000, Algeria;2. Laboratoire de Chimie Organique Appliquée, Groupe de Chimie Bioorganique, Université Badji-Mokhtar, Annaba, BP 12, Algeria;1. Dr. Panjwani Canter for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan;2. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Umm Al-Qura University, Makkah, KSA, Saudi Arabia |
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| Abstract: | This paper describes the creep behaviour of plain, notched and welded specimens machined from Inco718 sheet material. The Inco718 welded sheets experience out of plane distortion due to the welding process and these sheets also have weld beads with sharp fillet radii. Both the out of plane distortion and the fillet radii result in high stress concentrations and local plastic deformations which can significantly affect the failure life of the sheets, at high temperature, under creep conditions. Experimental creep testing using plain, notched and welded specimens was carried out at 620 °C. From the test data, the plasticity behaviour and the creep and damage constitutive equations were obtained for the material. On this basis, failure predictions of the welded sheets, based on continuum damage mechanics modelling, were conducted, using the finite element method. The results obtained are compared with the corresponding experimental data and the applicability of the method for predicting failure lives is discussed. |
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