Accession Number : ADA328790

Title :   Energy Partitioning and Microstructural Observations Related to Perforation of Titanium and Steel Targets.

Descriptive Note : Final rept. Jan-Sep 96,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Rupert, N. L. ; Grace, F. I. ; Huang, W. ; Murr, L. E. ; Niou, C-S.

PDF Url : ADA328790

Report Date : AUG 1997

Pagination or Media Count : 44

Abstract : This report presents an analysis of two target materials and the associated energetics related to the initial penetration into the target and perforation as the penetrator exits the target. Impact tests were conducted for tungsten alloy (WA) rods, striking rolled homogeneous armor (RHA), and titanium alloy plates. Rod-impact velocities were nominal 1,500 and 2,000 m/s. Target thicknesses were chosen so that the rods would overmatch the targets and lose some 200 m/s during penetration. The tests utilized flash x-rays to determine rod residual lengths and velocities and target plug features, to include thicknesses and velocities. From these observables, experimental determination of the corresponding kinetic energies (KEs) and estimates for the fracture energies were obtained. Also, in each case, target material adjacent to penetration-channel walls was examined by optical and electron microscopy and x-ray diffraction to gain further insight into deformation processes (cavity expansion) during penetration. The analytic penetration model gave results that were in good agreement with the experimental observables. In addition, it was observed that the RHA follows traditional plastic flow of cavity expansion, while WA shows deformation features that deviate significantly. The report discusses possible causes for these differences.

Descriptors :   *MICROSTRUCTURE, *TITANIUM ALLOYS, *TUNGSTEN ALLOYS, HYPERVELOCITY IMPACT, IMPACT TESTS, X RAY DIFFRACTION, CAVITIES, STEEL, ELECTRON MICROSCOPY, PENETRATION, KINETIC ENERGY, PERFORATION.

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE