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Comparison of the Effects of Debonds and Voids in Adhesive JointsAn analytical model is developed to compare the effects of voids an debonds on the interfacial shear stresses between the adherends and the adhesive in simple lap joints. Since the adhesive material above the debond may undergo some extension (either due to applied load or thermal expansion or both), a modified shear lag model, where the adhesive can take an extensional as well as shear deformation, is used in the analysis. The adherends take on only axial loads and act as membranes. Two coupled nondimensional differential equations are derived, and in general, five parameters govern the stress distribution in the overlap region. As expected, the major differences between the debond and the void occur for the stresses near the edge of the defect itself. Whether the defect is a debond or a void, is hardly discernible by the stresses at the overlap region. If the defect occurs precisely at or very close to either end of the overlap, however, differences of the order of 20 percent in the peak stresses can be obtained.
Document ID
19990018175
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rossettos, J. N.
(Northeastern Univ. Boston, MA United States)
Lin, P.
(Northeastern Univ. Boston, MA United States)
Nayeb-Hashemi, Hamid
(Northeastern Univ. Boston, MA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Nondestructive Evaluation of Adhesively Bonded Joints
Subject Category
Quality Assurance And Reliability
Funding Number(s)
CONTRACT_GRANT: NAG3-1129
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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