|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P1-95: Modeling Ductile Failure of High Strength Aluminum Alloy
||Balaji Selvarajou, Mark Jhon, Siu Sin Quek
|On-Site Speaker (Planned)
||Siu Sin Quek
Some classes of AA2xxx/AA7xxx aluminum alloys exhibit fracture orthotropy despite having relatively isotropic elastic and yield properties. Quantitative measures of fracture (e.g. elongation to fracture) can vary significantly with direction of loading with respect to the rolling direction. This orthotropy similarly manifests in the varying contribution of intergranular and transgranular failure with different loading directions. The origins of this orthotropy lies in microstructural features such as grain shape, size, and the grain boundary characteristics. In order to systematically assess the microstructural underpinnings of this orthotropy, we develop a crystal-plasticity finite element model coupled to fracture models within the grains and along the grain boundaries. Transgranular fracture is modeled by a Gurson-type model, while intergranular fracture is modeled using a cohesive law. We integrate our model with experiment using microstructural analyses with EBSD to construct statistically equivalent grain microstructures, enabling our model to capture realistic distributions of grain sizes and textures.