Modeling the High-Rate Responses of Wetted Granular Materials Across Scales and the Third-Party Replicable Validation Exercises Utilizing 3D Printers
Abstract
This YIP proposal is designed to make predictions of high-strain rate responses more reliable,robust and accurate by (1) deriving, formulating and verifying a dynamic multiscale discrete-continuum model that does not require macroscopic phenomenological laws to drive simulations,and (2) utilizing 3D printing techniques to make validation exercise fully replicable by thirdparties. At the grain-scale level, the focus will be on the development of a single grain interactswith liquid bridge with the variational eigen-fracture model applied on a polyhedral meshvalidated with published data. At the RVE-scale, the air-water multiple flow in the deformingsolid skeleton will be captured via a network mode. This multi-phase flow model is coupled witha DEM-FEM model that uses DEM to search, update and detect grain contacts uponfragmentation and uses poly-FEM to simulate fractures. The proposed work will leverage therecent development of a new higher-order homogenization theory by the PI to upscale both theCauchy and higher order coupled stress for field-scale SPH simulations. One innovative aspectof the proposed research is the development of the open-source codes and validation exercisesthat utilizes 3D printing techniques to manufacture replicable specimen. This newfoundtransparency will provide the key to encourage other researchers to investigate, replicate anddiscover and make comparisons without injecting bias. As an example, split-Hopkinson bar testsconducted with digital image correlation on the natural and manufactured particle assemblieswill significantly reduce the experimental uncertainties and provide valuable insights andquantifiable data to assess the accuracy and robustness of the multiscale model.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 02, 2017
- Source ID
- FA95501710169
Entities
People
- WaiChing Sun
Organizations
- Air Force Office of Scientific Research
- Trustees of Columbia University in the City of New York
- United States Air Force