EXPERIMENTALLY-DETERMINED PLASTIC WAVE VELOCITIES IN POLYCARBONATE (LEXAN)

A previously-reported 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 further 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 per sec have been recorded, as well as wave velocities to 7500 ft/sec.

• Corporate Authors:

  North Carolina State University, Raleigh

  Raleigh, NC  United States  27695
• Authors:
  • Liddell, W L
  • Steele, R S
  • Bingham, W L
  • DOUGLAS, R A
• Publication Date: 1970-12

Media Info

• Features: References;
• Pagination: 36 p.

Subject/Index Terms

• TRT Terms: Diffraction; Plasticity; Structural analysis; Wave motion
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00025599
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: 70-10
• Contract Numbers: N00014-68-A-0187
• Files: TRIS
• Created Date: Feb 11 1973 12:00AM