Dynamic Mechanical Analysis of Shear-Jammed Suspensions
Abstract
Concentrated ("dense") suspensions of small solid particles dispersed in a fluid exhibit complex behavior that is of fundamental scientific interest and at the same time opens up new avenues for applications in the area of mechanically responsive materials. In particular, such suspensions can undergo an abrupt increase in their resistance to movement and can even transform from a freely flowing to a rigid, solid-like state when impacted or sheared. This fully reversible fluid-to-solid transformation exhibits highly desirable energy dissipation properties due to the preponderance of frictional particle interactions. The project will advance experimental capabilities by combining, in the same equipment, rheological characterization of dense suspensions in their unjammed, fluid state with dynamical mechanical analysis of the material as it is driven through the shear jamming transition into its solid-like state. These unique capabilities will aid in the design of stress-adaptive suspensions in which the frictional interactions between particles are made programmable via light-responsive chemistries. The project aims to uncover the fundamental physical mechanisms underlying the stress-activated fluid-to-solid transformation in dense suspension and to explore dynamically tunable energy dissipation properties for next-generation protective gear.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2021
- Source ID
- W911NF2110038
Entities
People
- Heinrich Jaeger
Organizations
- Army Contracting Command
- United States Army
- University of Chicago