Polar Moments and Ballistic Properties of Tri-Foil Penetrators.

Abstract

Early design tools for tri-foils involved the use of ersatz structures for analysis purposes. This paper presents a method that employs the actual shape to calculate the polar moments of inertia relative to a rod of equal cross sectional area. the method also degrades at its extrema into two logical shapes for this calculation, namely the circle and the equilateral triangle. A ballistic test was performed on a tri-foil having an effective aspect ratio of 14. Performance comparisons with a rod of aspect ratio 16 shows the ballistic performance of the tri-foil to be of the same order but marginally poorer. Systems considerations using tri-foils could make the tri-foil more attractive than the rod. Keywords: Penetrators; Finned rods; Tubular projectiles; Multiple targets; Moments of inertia.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1985
Accession Number
ADA159870

Entities

People

  • D. N. Hansen

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Army
  • Aspect Ratio
  • Commerce
  • Computer Programs
  • Computers
  • Diameters
  • Equations
  • Geometry
  • Inertia
  • Materials
  • Moment Of Inertia
  • Projectiles
  • Regression Analysis
  • Residuals
  • Shape
  • Simultaneous Equations
  • Targets

Readers

  • Data Mining and Knowledge Discovery.
  • Geodesy
  • ballistics.