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

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Abstract:

An experimental test program was conducted to evaluate different techniques of fabricatingtreating 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 fabricationtreatment 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.

Author(s):
Bowman, Daniel R.
Author Organization(s):
DAYTON UNIV OH RESEARCH INST
Descriptive Note:
Final rept. 1 Jan 92-31 May 93,
Pagination:
0067

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
WL*-TR-93-3086
Contract/Grant Number(s):
F33615-92-C-3402
Task Number(s):
03
Project Number(s):
2402
Monitor Series:
TR-93-3086, WL*
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_1.2.3_Educating; JCA_4.6_Engineering; JCA_1.2.5_Lessons Learned
Communities of Interest:
Air Platforms
Descriptor(s):
*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
Field(s)/Group(s):
Plastics, Manufacturing and Industrial Engineering and Control of Production Systems
Keyword(s):
PE62201F, WUWL24020372
Report Date:
1993 Aug 01