Continuation of Experimental Study of Small Particle Impacts into Ablative Materials
Abstract
This report describes small particle impacts into ablative materials. (AD-385 683L). Utilizing the light-gas gun, impact tests with glass spheres from 3.18 mm to 100 microns in diameter were made into three ablatives; phenolic nylon, carbon phenolic, and oblique tape wound refrasil. Velocities ranged from 0.74 to 7.9 km/sec and angles of obliquities ranged from 10 to 90 degrees. It was established that modified explosive scaling does not hold true for hypervelocity impacts into ablatives, and dimensionless damage parameter such as penetration/projectile size are dependent on both velocity and projectile dimension rather than on velocity alone. Penetration measurements of virgin phenolic nylon targets impacted by 3.18-mm aluminum spheres showed good correlation with the theoretical formula of Walsh. It was also determined that for obliquity tests where the normal velocity component/target sound speed > or = 1, the mass loss and depth of penetration are proportional to the normal velocity component for angles of obliquity down to twenty degrees.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1968
- Accession Number
- AD0394828
Entities
People
- Stanley M. Halperson
Organizations
- United States Naval Research Laboratory