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A Comparison of Buffer Strip and Non-Buffer Strip Joint Designs
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Buffer strip and non-buffer strip bolted wing skin type joints made from NARMCO 5208T300 graphite-epoxy material were designed, and the excess bearing capacity and weight of these joints were calculated for a wide range of laminate compositions, bolt hole sizes, and number of bolt holes. Design load conditions representative of an advanced fighter type aircraft were chosen. Joint designs were arbitrarily restrained by assumed manufacturing conditions, assumed interface conditions, and imposed laminate composition restrictions. Charts were prepared from which relative joint efficiencies could be determined but no attempt was made to analyze the effect of the arbitrary design restrictions. The advantages and penalties for buffer strip design were discussed and recommendations for future studies were made.
APPROVED FOR PUBLIC RELEASE