Accession Number : ADA272666


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


Descriptive Note : Final rept. 1 Jan 92-31 May 93,


Corporate Author : DAYTON UNIV OH RESEARCH INST


Personal Author(s) : Bowman, Daniel R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a272666.pdf


Report Date : Aug 1993


Pagination or Media Count : 67


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.


Descriptors :   *ANNEALING , *SURFACE FINISHING , *STRENGTH(MECHANICS) , *POLYCARBONATES , *FATIGUE(MECHANICS) , *THERMOPLASTIC RESINS , TEST AND EVALUATION , MECHANICAL PROPERTIES , FATIGUE LIFE , VARIATIONS , HOLES(OPENINGS) , TENSION , POLISHING , DRILLING , EXITS , ROUGHNESS , FASTENINGS , COMPRESSIVE STRENGTH , BONDING , SOLVENTS , FATIGUE , COLD WORKING , ADDITION , SHOT PEENING , FINISHES , RESIDUALS , SURFACES , FABRICATION , SURFACE ROUGHNESS , CHEMICALS , TENSILE STRENGTH , STRESSES


Subject Categories : Plastics
      Mfg & Industrial Eng & Control of Product Sys


Distribution Statement : APPROVED FOR PUBLIC RELEASE