Microstructure-Sensitive Fatigue Design of Notched Components
Final rept. 1 May 2011-31 Oct 2014
HOWARD UNIV WASHINGTON DC
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This research, funded by the Department of Defense via the Research and Education Program for Historically Black Colleges and Universities and Minority-Serving Institutions HBCUMI, was conducted at the Applied Mechanics and Materials Research Laboratory, Howard University, Washington, DC from May 1, 2011 through October 31, 2014. The overall objective of the project is to develop and implement robust simulation-based strategies for notch root analysis and fatigue life prediction that account for the interactions between the complexity of the material microstructures and the notch-root stress gradients. A new probabilistic framework was developed to analyze the fatigue potency of notched specimens in order to improve the prediction of high cycle fatigue of notched components. The probabilistic framework based on Weibull s weakest link and extreme-value statistics was also extended to multiphase materials including titanium alloy and nickel-base super alloys using simulation strategies that capture both the essence of notch root stress gradient and the complexity of realistic microstructures. A new approach which can be applied using crystal plasticity finite element or closed-form solution was also developed as a more robust approach for determining the fatigue notch factor than the existing classical methods.
- Metallurgy and Metallography
- Statistics and Probability