Fluid-like Flow, Surface Instabilities and Folding in Metal Plasticity and Wear: Research Area 9: Materials Science
Abstract
The proposed research will examine defomiat ion processing science of structural metals through a fundamental study of flow fields at surfaces. The study will ut ilize high-speed in situ imaging of flow and deformation in the model system of a hard wedge sliding against a metal. The in situ analysis will be complemented by characterization of microstructure and mechanical properties, crystallographic texture measurements, and simulations of flow incorporating "grain" level structure and crystal plasticity. Specific topics pertaining to surface flow that will be examined are: flow types and instabilities; effects of workpiece microstructure and ducti lity on flow; effect of flow type on surface strains and defect formation; and scaling of the deformation. Analytical models will be developed to describe flow transitions and instabilities that arise during the sliding. The envisaged outcomes are flow classifica tion in tenns of deformation parameters, methods to engineer surfaces with novel microstructures and properties, and strategies for controlling non-steady flows and defects at surfaces. The proposed material systems are structural metals from each of the three common crystal classes, and age-hardening alloys. The applications domains are materials and discrete products manufacturing, and wear in structural components.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1510591
Entities
People
- Srinivasan Chandrasekar
Organizations
- Army Contracting Command
- United States Army
- University of Virginia