Accession Number : ADA328383

Title :   The Micromechanics of High Strain-Rate Deformation and Failure of Dual-Phase Composites.

Descriptive Note : Final rept.

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD

Personal Author(s) : Bao, G.

PDF Url : ADA328383

Report Date : 27 JUN 1997

Pagination or Media Count : 7

Abstract : Under the support of ARO (Grant number: DAAH04-94-G-0086, Solid Mechanics Program, Program Director, Dr. K. Iyer), a three-year basic research program is carried out on the micromechanics of high strain-rate deformation and failure in dual-phase composites. Three composite material systems are studied: (1) tungsten heavy alloys and tungsten-based composites; (2) ceramic particle reinforced metal matrix composites; and (3) penetrator/armor material combinations. Emphasis is placed on the relationship between the microstructure and material behavior of the dual-phase solids, aiming to provide guidelines for the design of advanced armor/antiarmor systems. The outcomes of this three-year program include: (1) A better understanding of the fundamental relationship between the high strain rate behaviors and material microstructures of metal alloys and composite materials in advanced penetrator/armor systems. (2) Formulae and design charts that quantify the effects of relative volume fractions, strain and strain rate hardening, thermal softening, and the amount of damage on the overall behavior of the dual-phase solids. (3) Micromechanical models and computational schemes that can be used to predict the dynamic behavior of the penetrator and armor materials; these models and schemes may provide a basis to link the material microstructures to ballistic performance.

Descriptors :   *COMPOSITE MATERIALS, *DEFORMATION, *STRAIN RATE, *MICROMECHANICS, *DUAL MODE, *TUNGSTEN ALLOYS, THERMAL PROPERTIES, ARMOR, MICROSTRUCTURE, COMPUTATIONS, ANTIARMOR AMMUNITION, DYNAMIC RESPONSE, FAILURE, STRAIN HARDENING, METAL MATRIX COMPOSITES, SOLIDS, ALLOYS, PHASE, CERAMIC MATERIALS, PARTICLES, PENETRATION, BALLISTICS, REINFORCING MATERIALS, METAL COMPOUNDS, HEAVY ELEMENT COMPOUNDS.

Subject Categories : Laminates and Composite Materials
      Armor
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE