Primary Adhesively Bonded Structure Technology (PABST). General Material Property Data

This program investigated state-of-the-art adhesives, adhesive primers, surface treatments, and coatings to determine, through durability testing, a system that could be used to adhesively bond a primary aircraft structure. Test methods were also evaluated. Previous work indicated cyclic- stressed t...

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Bibliographic Details
Main Authors: Shannon, R W, Stifel, P, Beger, R, Hughes, E J, Rutherford, J L
Format: Report
Language:English
Subjects:
ADHESIVE BONDING
ADHESIVES
Adhesives, Seals and Binders
Aircraft
AIRFRAMES
ANODIC COATINGS
CYCLIC TESTS
ENVIRONMENTAL TESTS
Mfg & Industrial Eng & Control of Product Sys
PABST(PRIMARY ADHESIVE BONDED STRUCTURE TECHNOLOGY)
PROCESSING
PROTECTIVE COATINGS
STATE OF THE ART
SURFACES
TEST METHODS
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Summary:This program investigated state-of-the-art adhesives, adhesive primers, surface treatments, and coatings to determine, through durability testing, a system that could be used to adhesively bond a primary aircraft structure. Test methods were also evaluated. Previous work indicated cyclic- stressed testing in hostile environments and, specifically, high moisture environments reduced the life and durability of a given adhesive system over the same system load to the same level at constant stress. Conclusions include: (a) Stressed durability testing is required to determine if a given surface treatment is durable; (b) Normal industry accepted processing tolerances on surface treatments are too wide to produce consistently durable bonded joints; (c) Handling of surface treated details must be designed to prevent mechanical damage and contamination; (d) Phosphoric acid anodize process was the surface treatment most tolerant to processing variations and inspectable; (e) Adhesive primers from different suppliers demonstrated a large variation in environment resistance and corrosion protection capabilities; (f) The type of carrier used in adhesive films has a large effect on the moisture resistance of the adhesives; and (g) Cyclic stressed testing in a hostile environment is necessary to determine the optimum adhesive durability.