UNLOCKING OF THE UNEXPECTED BEHAVIORS OF POLYUREA
Abstract
UNLOCKING OF THE UNEXPECTED BEHAVIORS OF POLYUREAAbstractThe connection between small-scale phase transitions in multiphase compo"site materials, critical behavior andextreme properties in a number of composite materials and manufactured metamaterials is sugges"ted by experimental and theoretical work. That connection further suggests the following compelling working hypotheses and lines of" inquiry: i) The temperature and strain-rate behavior of Polyurea obey a temperature-strain rate equivalence principle, whereby the"" effect of an increase in strain rate is equivalent to an increase in temperature; ii) By this temperature-strain rate principle, t"he hard phase of Polyurea amorphizes at a critical glass-transition strain-rate; iii) The glass-transition induces incremental negative stiffness in the hard phases resulting in critical behavior; iv) Criticality results in extreme stiffness and rate sensitivity. The prosed work under the grant will be directed at evaluating these hypotheses and ascertaining their ability to explain the observed anomalous behaviorof Polyurea under extreme conditions of pressure and rate of deformation. The expected outcome of the research will be a fundamental understanding of the root causes of the unexpected behaviors of Polyurea.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 01, 2017
- Source ID
- N000141712769
Entities
People
- Michael Ortiz
Organizations
- California Institute of Technology
- Office of Naval Research
- United States Navy