|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Integrative Materials Design III: Performance and Sustainability
||Fatigue Crack Growth in Structural Cast Aluminum Alloys: Microstructural Mechanisms, Modeling Strategies, and Integrated Design
||Anthony Spangenberger, Diana Lados
|On-Site Speaker (Planned)
Fatigue crack growth (FCG) studies were performed on cast aluminum alloys A356 and 319. Microstructures were altered through processing, chemistry, and heat treatment in order to systematically investigate the individual and combined effects of the materials’ characteristic microstructural features on FCG. Long FCG tests were conducted on compact tension specimens at room temperature at three stress ratios (R=0.1, 0.5, 0.7), and small FCG tests were performed on corner flaw tension specimens at R=0.1. Microstructural effects on FCG were studied by fractographic and novel techniques across all propagation regimes, and fundamental scale-bridging phenomena were identified. A new methodology was developed to predict microstructurally small FCG response from long FCG data, integrating microstructural characterization. Computational models using the extended finite element method were also created to simulate microstructural FCG, and further validated with results from digital image correlation experiments. The results provide guidelines for materials’ design and optimization for FCG resistance.
||Planned: Supplemental Proceedings volume