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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Computational Materials Discovery and Optimization: From 2D to Bulk Materials
Presentation Title Fatigue Crack Growth Modeling and Microstructural Mechanisms in Engine Materials under Hot Compressive Dwell Conditions
Author(s) Xiang Chen, Diana Lados, Richard Pettit, David Dudzinski
On-Site Speaker (Planned) Xiang Chen
Abstract Scope Fatigue crack growth (FCG) under Hot Compressive Dwell (HCD) conditions, a special case of creep-fatigue occurring under compressive stress, represents an important failure mode in many high temperature applications. Tensile residual stresses building up at the crack tip are considered a key factor contributing to FCG under HCD conditions. To understand and quantify this effect, a physics-based model was developed, in which residual stress contributions are added to the elastic and plastic responses of the material to predict the behavior. In contrast with the existing complex models, this approach is simple, easy to apply, and generates good predictions. Results from both isothermal and non-isothermal tests compared favorably with the model predictions. Comprehensive SEM/TEM studies were also performed to understand HCD effects at the microstructural scale of two engine alloys (cast Al-319 and IN718), and recommendations will be given to optimize the materials’ microstructures and behavior for high temperature applications.
Proceedings Inclusion? Planned: A print-only volume


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