Development of an Understanding of the Fatigue Phenomena of Bonded and Bolted Joints in Advanced Filamentary Composite Materials.
Interim rept. Mar 70-Feb 71,
LOCKHEED-GEORGIA CO MARIETTA ADVANCED STRUCTURES DIV
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Initial program efforts were directed primarily to planning, joint design, joint analysis and basic evaluation of the boron material. The planning efforts resulted in the establishment of the type of specimens, specimen identification, test parameters, and number of specimens required for accomplishing the objectives of this period a closed form joint analysis has been developed for the elastic condition. This solution has also been expanded to include nonlinear adhesive properties for ultimate joint strength analysis. The majority of the Phase I bonded joints have been fabricated and tested. All the baseline data have been generated and constant life diagrams developed for the basic bonded specimen configuration. Correlation between constant amplitude-frequency fatigue testing and spectrum loading has been initiated. Failure mode studies have been conducted for specimens subjected to various types of loading and definite failure modes have been established for specific loading conditions. Author, modified-PL
- Metallurgy and Metallography
- Couplers, Fasteners and Joints