Accession Number : AD0287214

Title :   BEHAVIOR OF PLASTICS UNDER IMPULSIVE STRESS

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : BARRY,W.T. ; SEMON,H.W.

Report Date : SEP 1962

Pagination or Media Count : 1

Abstract : The impulsive loading of GE Century Resins revealed that, for the glassy, more rigid materials, disk-shaped fractures were formed, approximately circular, having central initiation sites of irregular shape. For the rubbery compounds conically-shaped, rosette-type fractures were formed. In general, impact velocities for threshold fracture were greater for the rubbery materials than for the glassy materials. The impacts were produced by compressed gas-driven flying plates. Where equation of state data were known, initial impact pressures were obtained. For the rigid materials studied in most detail, both the fracture disk and initiation site diameters increased with increasing driver thickness. Particles and discontinuities purposely introduced during specimen casting did not increase the number of fractures or change the initial impact pressures for fracture. Detailed microscopic examination of initiation sites indicated the need for more knowledge about the shape of the stress pulse. (Author)

Descriptors :   *IMPACT SHOCK, *PHENOLIC PLASTICS, *PLASTICS, ABLATION, DEGRADATION, EQUATIONS OF STATE, EROSION, FRACTURE (MECHANICS), LOADING, MATERIALS, MECHANICAL PROPERTIES, MICROSCOPY, PULSE MODULATION, SHIELDING, SPALLATION, STRESSES, TEST METHODS, THERMAL STRESSES

Distribution Statement : APPROVED FOR PUBLIC RELEASE