NDLI: A fracture mechanics approach for designing adhesively bonded joints

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A fracture mechanics approach for designing adhesively bonded joints

Content Provider	NASA Technical Reports Server (NTRS)
Author	Johnson, W. S. Mall, S.
Copyright Year	1983
Description	An analytical and experimental investigation was undertaken to determine if the adhesive debond initiation stress could be predicted for arbitrary joint geometries. The analysis was based upon a threshold total strain-energy-release rate (Gth) concept. Two bonded systems were tested: T300/5208 graphite/epoxy adherends bonded with either EC-3445 or FM-300 adhesive. The Gth for each adhesive was determined from cracked-lap-shear (CLS) specimens by initiation tests. Finite-element analyses of various tapered CLS specimen geometries predicted the specimen stress at which the total strain-energy-release rate (GT) equaled Gth at the joint tip. Experiments verified the predictions. The approach described herein predicts the maximum stress at which an adhesive joint can be cycled yet not debond. Furthermore, total strain-energy-release rate appeared to be the driving parameter for cyclic debonding and debond initiation in structural adhesives. In addition, debond initiation and growth were found to occur with virtually no peel stress present.
File Size	715597
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19830028239
Archival Resource Key	ark:/13960/t2x39mm0p
Language	English
Publisher Date	1983-09-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Stress Analysis Fracture Mechanics Joints Junctions Strain Energy Release Rate Adhesive Bonding Modulus of Elasticity Adhesion Specimen Geometry Finite Element Method Strain Energy Methods Graphite-epoxy Composites Composite Structures Prediction Analysis Techniques Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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