Structural Integrity Investigation of Delaminated F-4 Canopies in Support of the Analytical Rework Program

Cyclic pressure tests, under various environmental conditions, were run on the F- 4 forward and aft canopies to determine the safe life that could be expected after these canopies had suffered delamination damage of the acrylic sheet. Canopies having edge delaminations were initially tested for 1775...

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Bibliographic Details
Main Author: Swartz,R P
Format: Report
Language:English
Subjects:
ACRYLIC RESINS
AIRCRAFT CANOPIES
Attack and Fighter Aircraft
DEGRADATION
DELAMINATING
ENVIRONMENTAL TESTS
F-4 AIRCRAFT
FRACTURE(MECHANICS)
JET FIGHTERS
LAMINATED PLASTICS
LIFE EXPECTANCY(SERVICE LIFE)
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Summary:Cyclic pressure tests, under various environmental conditions, were run on the F- 4 forward and aft canopies to determine the safe life that could be expected after these canopies had suffered delamination damage of the acrylic sheet. Canopies having edge delaminations were initially tested for 17757 pressure cycles, the equivalent of 7102 hours of flight. This testing resulted in no increase of the original damage. Additional damage was then introduced by cutting 1/16 inch deep grooves into the canopy's surfaces. Further testing at high temperatures produced surface damage. However, no catastrophic failure resulted. (Author, modified-PL)