Accession Number : AD0717327

Title :   Experimentally-Determined Plastic Wave Velocities in Polycarbonate (Lexan) (Striker Velocity 1071 ft/sec to 1810 ft/sec).

Descriptive Note : Technical rept.,

Corporate Author : NORTH CAROLINA STATE UNIV RALEIGH

Personal Author(s) : Liddell,W. L. ; Steele,R. S. ; Bingham,W. L. ; Douglas,R. A.

Report Date : DEC 1970

Pagination or Media Count : 43

Abstract : Experimental system for determining the large axial strains, surface rotations, strain rates, and plastic wave velocities during axial impacts at striker velocities up to 2000 ft/sec has been developed, and is used to investigate the behavior of polycarbonate (Lexan) under high-speed impact. The system employs in-surface diffraction grating strain transducers illuminated with a pulsed ruby laser, with the strain-surface rotation-time-dependent diffraction pattern recorded by high-speed streak cameras. Strain-time and plastic wave velocity-strain data are presented for axial impacts of polycarbonate rods at striker velocities ranging from 1071 ft/sec to 1810 ft/sec. Strains in excess of 20 percent with strain-rates in excess of 16,000 1/sec have been recorded, as well as wave velocities to 7500 ft/sec. (Author, modified-PL)

Descriptors :   (*IMPACT TESTS, TEST METHODS), (*PLASTICS, STRAIN(MECHANICS)), (*DIFFRACTION GRATINGS, *STRAIN GAGES), RODS, LASERS, PLASTIC PROPERTIES, TEST EQUIPMENT

Subject Categories : Test Facilities, Equipment and Methods
      Optics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE