Caglar Oskay delivered an invited talk at the US Army ERDC – 06/11/2019
Lecture Title: Multiscale State and Failure Prediction in Structures Operating in Severe Loading and Environments
Location: US Army Engineer Research and Development Center (ERDC), Vicksburg, MS.
Over the past couple of decades, tremendous effort has been devoted to the development of multiscale computational modeling and simulation strategies for physics-based prediction of structural response. Among these strategies, concurrent multiscaling holds great potential in effectively bridging the “material” response to that of the “structure”. Yet these approaches are so computationally intensive that they remained within the academic realm, and have not made impact on realistic engineering problems. In the first part of this talk, we will discuss a reduced order multiscaling approach that addresses this important technological gap, and enables physics-based simulation of large-scale structural response. Sparse and scalable computational implementation strategies that can efficiently solve the resulting multiscale system will be discussed. We will demonstrate the capabilities of this approach on structures made of polycrystalline materials.
The second part of the talk will focus on how we can identify the most important microstructural mechanisms and topological characteristics that ultimately cause structural failure. This information is crucial in the development of reduced order models that retain the appropriate physics, but eliminate inconsequential processes from the multiscale analysis. We will present a novel parameter sensitivity analysis / uncertainty quantification framework and demonstrate the capabilities of this framework in the context of dynamic analysis of polycrystalline energetic material microstructures.