Accession Number:

ADA030770

Title:

Stress Analysis of Plastic Rotating Bands

Descriptive Note:

Final rept. 1 Apr-30 Sep 1975

Corporate Author:

CALIFORNIA RESEARCH AND TECHNOLOGY INC CHATSWORTH

Personal Author(s):

Report Date:

1976-02-01

Pagination or Media Count:

95.0

Abstract:

Dynamic stress analyses of plastic rotating bands, used on projectiles to impart spin, have been obtained by means of a two-dimensional finite-difference computer code. The first phase of the interaction within the barrel, involving the axisymmetric convergence of the plastic band into the forcing cone, has been investigated in this study. Numerical solutions for three rotating band problems were obtained. The results of these solutions showed that 1 shearing forces acting along the bandbarrel interface due to friction can have a major effect on rotating band performance, and 2 that with a current band design, the sharply-beveled rear section of the band becomes grossly distorted and develops a large annular lip protruding from the rear of the band i.e., feathering. The third case considered a design modification made to alleviate the extrusion problem. These initial analyses show that finite-difference code solutions of the dynamics of rotating bands are practical and can provide a useful tool to investigate a number of key factors bearing on plastic band performance, such as material properties, stress-strain conditions experienced, and band geometries.

Subject Categories:

  • Plastics
  • Ammunition and Explosives
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE