Accession Number : ADA313783

Title :   Investigation of Dynamic Material Response for Model Development.

Descriptive Note : Final rept. 15 Jan 91-14 Jan 94,

Corporate Author : BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING

Personal Author(s) : Clifton, Rodney J.

PDF Url : ADA313783

Report Date : 1994

Pagination or Media Count : 10

Abstract : Shear band development in a tungsten heavy alloy has been studied by means of pressure-shear plate impact experiments coupled with finite element calculations. By taking into account the viscoplastic response of the constituents, and by utilizing microstructures obtained by digitizing micrographs of the actual alloy, the principal features of the observed shear band features have been obtained in the calculations. This agreement between theory and experiment has provided insight into the mechanism of shear strain localization in tungsten-based composites. Shear band formation and the resulting microstructures have also been studied in AISI 4330 VAR steel. Transmission electron microscope studies have revealed that the microstructure of the tempered martensite, before and after shear band formation, consists of bcc ferrite grains. The effect of the shear localization is to create thin, highly elongated grains as well as dislocation cell structures. Details of the misorientations between neighboring grains and neighboring cells have been determined.

Descriptors :   *MODELS, *MATERIALS, *DYNAMIC RESPONSE, *TUNGSTEN ALLOYS, VISCOPLASTICITY, SHEAR PROPERTIES, MICROSTRUCTURE, FINITE ELEMENT ANALYSIS, ELECTRON MICROSCOPES, STRUCTURES, STRAIN(MECHANICS), DISLOCATIONS, TEMPERING, MARTENSITE, SHEAR STRENGTH.

Subject Categories : Properties of Metals and Alloys
      Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE