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Non-classical adhesive-bonded joints in practical aerospace constructionSolutions are derived for adhesive-bonded joints of non-classical geometries. Particular attention is given to bonded doublers and to selective reinforcement by unidirectional composites. Non-dimensionalized charts are presented for the efficiency limit imposed on the skin as the result of the eccentricity in the load path through the doubler. It is desirable to employ a relativly large doubler to minimize the effective eccentricity in the load path. The transfer stresses associated with selective reinforcement of metal structures by advanced composites are analyzed. Reinforcement of bolt holes in composites by bonded metal doublers is covered quantitatively. Also included is the adhesive joint analysis for shear flow in a multi-cell torque box, in which the bond on one angle becomes more critical sooner than those on the others, thereby restricting the strength to less than the total of each maximum strength when acting alone. Adhesive plasticity and adherend stiffness and thermal imbalances are included. A simple analysis/design technique of solution in terms of upper and lower bounds on an all-plastic adhesive analysis is introduced.
Document ID
19740004442
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hart-Smith, L. J. (Douglas Aircraft Co., Inc. Long Beach, CA, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1973
Subject Category
Structural Mechanics
Report/Patent Number
NASA-CR-112238
Accession Number
74N12555
Funding Number(s)
CONTRACT_GRANT: NAS1-11234
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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