Exploratory Development on Durability of Adhesive Bonded Joints
Abstract
The objectives of the program were to evaluate stressed durability test methods, to use these methods to test adhesive bonding materials and processes, and to develop a correlation between laboratory test results and in- service performance. The test method evaluation was completed early in the program and results were published in an interim technical report, AFML-TR-75-3, Durability of Adhesive Bonded Joints, February 1975. Four stressed durability test methods were selected for the test program: (1) A thick-adherend lap-shear specimen (Mode I and Mode II loading); (2) A thick-adherend double cantilever beam (DCB) specimen (Mode I loading); (3) A thin adherend DCB specimen (wedge test, Mode I loading); and (4) A thick adherend single cantilever beam (SCB) specimen for honeycomb sandwich evaluation (Mode I and Mode II loading). Alloy, adherend surface treatment, adhesive primer, and adhesive interactions were evaluated. The materials and processes used were: (1) Alloys: 2024-T3, 2024-T3 clad (1230 alloy), 7075-T6, and 7075-T6 clad (7072 alloy); (2) Adhesives: FM 123-2 and EA 9628 250 F curing adhesives, and AF 143 and PL 729-3 350 F curing adhesives; (3) Primers: BR 123 non-corrosion-inhibiting primer, BR 127 corrosion-inhibiting primer, and EC 3917 and PL 728 corrosion-inhibiting primers for use with the two 350 F curing adhesives; (4) Adherend surface treatment processes: Optimized FPL etch, chromic acid anodize, and phosphoric acid anodize; and (5) Aluminum honeycomb core: Standard core, Dura-Core and CR III corrosion-resistant cores, and phosphoric acid anodized core.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1976
- Accession Number
- ADA039864
Entities
People
- J. A. Marceau
- J. C. Mcmillan
Organizations
- Boeing