Three-dimensional crack growth modelling of a Ni-based superalloy at elevated temperature and sustained loading
| Autor: | Kjell Simonsson, Erik Storgärds, Sören Sjöström |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
02 engineering and technology Crack growth modelling Crack growth resistance curve Sustained load Crack closure 0203 mechanical engineering Crack tunnelling Materialteknik General Materials Science Growth rate Composite material Applied Mechanics Teknisk mekanik business.industry Applied Mathematics Mechanical Engineering Structural engineering Materials Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics High temperature Superalloy 020303 mechanical engineering & transports Ni-based superalloy 0210 nano-technology business human activities |
| Popis: | High temperature materials subjected to elevated temperature have been shown to be sensitive to dwell times, giving an increased crack growth rate. The interaction between these dwell times and rapid cyclic loads have been shown to constitute a complex problem. Many models have been developed for 1D conditions, but the application to general 3D conditions has seldom been seen, although this is the most common case in most structures. In this paper a model for taking care of the interaction between these load modes in general 3D crack growth has been developed. The model uses 1D results for extension to general 3D, thus providing for local crack front evolution with a minimum of numerical simulations. The model has been implemented for usage with finite element calculations and several different tests are simulated and compared with experimental results for the nickel based superalloy Inconel 718 at 550◦C. The simulation results show crack shapes in agreement with experimental fracture surfaces and time to failure. Funding agencies: Swedish Energy Agency; Siemens Industrial Turbomachinery AB; GKN Aerospace Engine Systems; Royal Institute of Technology through the Swedish research programme TURBO POWERVid tiden för disputation förelåg publikationen som manuskript |
| Databáze: | OpenAIRE |
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