Accession Number : ADA305372

Title :   Solid Spherical Glass Particle Impingement Studies of Plastic Materials.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Rao, P. V. ; Young, Stanley G. ; Buckley, Donald H.

PDF Url : ADA305372

Report Date : APR 1983

Pagination or Media Count : 21

Abstract : Erosion experiments on polymethyl methacrylate (PMMA), polycarbonate, and polytetrafluoroethylene (PTFE) were conducted with spherical glass beads impacting at normal incidence. Optical and scanning electron microscopic studies and surface profile measurements were made on specimens at predetermined test intervals. During the initial stage of damage to PMMA and polycarbonate, material expands or builds up above the original surface. However, this buildup disappears as testing progresses. Little or no buildup was observed on PTFE. PTFE is observed to be the most resistant material to erosion and PMMA the least. At low impact pressures, material removal mechanisms are believed to be similar to those for metallic materials. However, at higher pressures, surface melting is indicated at the center of impact. Deformation and fatigue appear to play major roles in the material removal process with possible melting or softening.

Descriptors :   *THERMOPLASTIC RESINS, *EROSION RESISTANCE, DAMAGE, DEFORMATION, POLYMETHYL METHACRYLATE, LOW PRESSURE, SURFACES, EROSION, PROFILES, WEAR, POLYCARBONATES, TETRAFLUOROETHYLENE RESINS, BEADS, IMPINGEMENT.

Subject Categories : Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE