Levich Institute Seminar Announcement, 11/19/2019

 

Tuesday, 11/19/2019
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Prabhu Nott

Indian Institute of Science, Bangalore, India

Coherent Force Transmission in Disordered Particle Assemblies and its Relation to Mechanics”

ABSTRACT

Dense granular materials and other particle aggregates transmit stress in a manner that belies their microstructural disorder. A subset of the particle contact network is strikingly coherent, wherein contacts are aligned nearly linearly and transmit large forces. Important material properties are associated with these force chains, but their origin has remained a puzzle. We classify subnetworks by their linear connectivity, and show the emergence of a percolation transition at a critical linearity at which the network is sparse, coherent, and contains the force chains. The subnetwork at critical linearity closely reflects the macroscopic stress and explains distinctive features of granular mechanics.

BRIEF ACADEMIC/EMPLOYMENT HISTORY:

PhD Princeton University, 1990
Post doctoral fellow at Caltech, 1991-92
Assistant Professor – Professor, Indian Institute of Science, 199

MOST RECENT RESEARCH INTERESTS:

Dilatancy in slow granular flows
Stress transmission in granular media
Rheology of dense suspensions
Shape dynamics of deformable elastic particles suspended in a fluid