Toward Understanding the Dynamic Response of Materials under Extreme Loading Conditions: (i) Temperature Measurement; (ii) Phase Transformation; (iii) Failure
Abstract
Toward Understanding the Dynamic Response of Materials under Extreme Loading Conditions: (i) Temperature Measurement; (ii) Phase Transformation; (iii) FailureABSTRACTThis proposal addresses three critically important needs for improved understanding of the dynamic response of materials under extreme loading conditions: (i) What is the local temperature during deformation? (ii) Do phase transformations occur? (iii) Under what conditions does failure occur? These questions are addressed via combined experimental and computational investigations, designed to support computer simulation efforts in these areas.The temperature question is addressed by the development of a thin film thermocouple (TFTC) that is designed to have up to GHz frequency response by using thin elements and a high frequency wave guide to probe the temperature at the thermocouple junction. The question of phase transformations is addressed by implementing a plane wave geometry in which the sampleis recovered after passage of a single pulse through it to induce the phase transformation. Conditions for dynamic failure are addressed for polyurea and for its decohesion from various substrates: stainless steel, fiber glass composites, soda-lime glass, and PMMA. To enable straightforward interpretation of these dynamic failure experiments, the experimental geometry corresponds to that of the idealized model of a semi-infinite crack loaded by a plane tensile pulseat normal incidence. The research proposed herein is important for both civilian and military applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 26, 2018
- Source ID
- N000141812513
Entities
People
- Rodney Clifton
Organizations
- Brown University
- Office of Naval Research
- United States Navy