Accession Number : ADA307351

Title :   Determination of Temperature and Material Effects on High-Velocity Impact Craters in Ablative Heat-Shield Materials.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Tippens, Paul E. ; Davidson, John R.

PDF Url : ADA307351

Report Date : SEP 1966

Pagination or Media Count : 21

Abstract : Phenolic-nylon and elastomeric target materials were struck with 1.59-mm-diameter aluminum spheres traveling at 4 km/s. The ablative materials were tested at temperatures of 144 deg, 294 deg, and 422 deg K in evacuable test fixtures. Observed crater volumes were so irregular in shape that it was not possible to determine easily the effects of temperature and material independently from measurement error. Therefore, an analysis-of-variance technique was applied to experimental impact data to determine whether differences in material or temperature significantly affect the amount of crater damage. It was found in this investigation that no significant differences among the crater diameters or the penetration depths were attributable to temperature differences. However, both crater depth and diameter were influenced by differences in target materials.

Descriptors :   *COMPOSITE MATERIALS, *ELASTOMERS, *HEAT SHIELDS, HIGH VELOCITY, NYLON, IMPACT STRENGTH, PENETRATION, TERMINAL BALLISTICS, COLLISIONS, CRATERS, HEAT RESISTANT MATERIALS, HONEYCOMB CORES, ABLATIVE MATERIALS, PHENOLIC PLASTICS, METEOROIDS.

Subject Categories : Laminates and Composite Materials
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE