Effects of Bird Orientation at Impact on Load Profile and Damage Level

Abstract

This report describes an experimental study which was conducted to investigate the effects of bird orientation at impact and to identify the worst- case impact. 450 g substitute birds were launched with three different orientations onto 0.635 cm thick polycarbonate panels at four different locations. The minimum perforation velocity was used as the main criterion to measure damage; however, perforation wasn't achieved at the center of the panel and at the lower, or up-stream, corner. Therefore, another measure of damage was adopted for these locations; length of cracks, depth of pocket, etc. The end-on, or axial, orientation was found to be the most damaging orientation. Substitute birds were also launched with the two transverse orientations onto a rigid target plate at three obliquity angles, 90 degrees, 45 degrees, and 25 degrees. Impact pressures were measured, and analyzed. Pressure profiles showed shock pressure only. No steady-state pressures were observed. Shock pressures were compared to theoretical Hugoniot curves and good agreements were obtained.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1980
Accession Number
ADA090676

Entities

People

  • Antonios Challita
  • Blaine S. West

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Compressors
  • Dynamic Response
  • Failure Mode And Effect Analysis
  • Impact Loads
  • Laser Beams
  • Materials
  • Measurement
  • Plastic Explosives
  • Pressure Measurement
  • Steady Flow
  • Steady State
  • Storage Tanks
  • Test Facilities
  • Trajectories
  • Transducers
  • Vehicle Equipment

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Explosive Engineering.
  • Structural Health Monitoring of Composite Structures.