A high temperature fatigue damage model for single crystal superalloys
| Autor: | Esteban P. Busso, Serge Kruch, Jean-Louis Chaboche, Myriam Kaminski, Pascale Kanouté |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Viscoplasticity Mechanical Engineering Metallurgy Metals and Alloys Fatigue damage 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Numerical integration Superalloy Formalism (philosophy of mathematics) 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Fatigue loading Materials Chemistry Ceramics and Composites Crystallographic slip 0210 nano-technology Single crystal |
| Zdroj: | Materials at High Temperatures. 33:412-424 |
| ISSN: | 1878-6413 0960-3409 |
| DOI: | 10.1080/09603409.2016.1193995 |
| Popis: | This work presents a new formalism for a time-dependent (or incremental) fatigue damage model developed for single-crystal nickel-based superalloys. The proposed coupled damage viscoplastic formulation accounts for the damage associated with microcracks lying on planes parallel to those of the crystallographic slip systems, and for the effect of oxidation on microcrack closure. The latter is introduced in the microcrack damage evolutionary behaviour through an additional oxidation-related damage variable. A simplified approach is relied upon to enable an efficient numerical integration of the single crystal formulation within a cycle, by treating the viscoplasticity and oxidation-related damage in an uncoupled manner, and an extrapolating approach is proposed to deal with periodic fatigue loading conditions. Fatigue tests on the commercial superalloy AM1 are performed at several load amplitudes, frequencies and crystallographic orientations to calibrate the model and to study the effect of fatigue loading... |
| Databáze: | OpenAIRE |
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