An Experimental Evaluation of the Effect of Hole Fabrication/Treatment Techniques on Residual Strength and Fatigue Life of Polycarbonate Specimens with Holes

Abstract

An experimental test program was conducted to evaluate different techniques of fabricating/treating holes in extruded polycarbonate. This program included surface finish evaluation and tension-tension fatigue and tensile residual strength testing of polycarbonate specimens with open holes. Eight different hole fabrication/treatment techniques were developed, including drilling (several variations), step drilling, entry and exit radiusing, solvent polishing, shot peening, and cold working. The differences in tensile residual strength for the specimens with holes was minimal; however, fatigue life varied by as much as a factor of ten between the best technique, cold working, and the worst, chemical polishing. In addition, limited testing indicated that annealing extruded polycarbonate decreases fatigue life by eliminating favorable residual surface compressive stresses.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1993
Accession Number
ADA272666

Entities

People

  • Daniel R. Bowman

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Cold Working
  • Fabrication
  • Failure Mode And Effect Analysis
  • Fatigue Life
  • Finishes
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Shot Peening
  • Stress Concentration
  • Stress Strain Relations
  • Stresses
  • Surface Roughness
  • Tensile Testing
  • Test And Evaluation

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy
  • Surface Coatings Technology.