Accession Number:

ADA621961

Title:

Elastomeric Polymer-by-Design for Blast-Induced Shock-Wave Management

Descriptive Note:

Final rept. 30 Sep 2009-30 Nov 2014

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s):

• Nemat-Nasser, Siavouehe

Report Date:

2015-06-01

Pagination or Media Count:

25.0

Abstract:

Polyurea is a mierophase-separated block copolymer that has been shown to effectively mitigate blast-induced failure of steel and other structural materials. Polyurea exhibits unique properties, including pressure-dependent compressive stiffness, low tensile stiffness, high dissipation, and residual stiffness at high deformation levels, as a result of its morphology. These and other mechanical and physical attributes of block copolymers can be greatly enhanced and specifically tailored to manage stress waves over multi-frequency ranges. The technical objectives of the ONR-BRC are I to develop rules and tools for the creation of elastomer-based composites that can mitigate shocks and stress pulses over broad ranges of frequency and amplitude and 2 to optimize their compositions and characteristics at molecularnano-, micro-, meso- and macro-scales. An integrated approach was used to address the fabrication, modeling, and characterization needs involving integration of- Numerical and analytical design- Chemical synthesis, Elastomer-based composites, and Characterization and validation.

Descriptors:

• *BLOCK COPOLYMERS
• *SHOCK WAVES
• BLAST
• COMPOSITE MATERIALS
• DISSIPATION
• ELASTOMERS
• FABRICATION
• FAILURE(MECHANICS)
• FINITE ELEMENT ANALYSIS
• MEASUREMENT
• MECHANICAL PROPERTIES
• MOLECULAR DYNAMICS
• MORPHOLOGY
• PHYSICAL PROPERTIES
• PRESSURE
• SHEAR STRESSES
• STRUCTURAL STEEL
• SYNTHESIS(CHEMISTRY)
• TRAUMATIC BRAIN INJURIES
• ULTRASONIC INSPECTION
• VALIDATION

Subject Categories:

• Polymer Chemistry
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE