Fracture load predictions and measurements for toughened epoxy adhesive joints

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DOIResolve DOI: http://doi.org/10.1016/j.engfracmech.2009.05.011
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TypeArticle
Journal titleJournal of Engineering Fracture Mechanics
Volume76
Issue13
Pages20392055; # of pages: 17
SubjectAdhesive joints; strenght prediction; mixed mode fracture; R-Curve; toughened epoxy; prédiction de résistance; fracture multimode; plusieurs modes; coubre en R; courbe de dispersion; époxy renforcé; mécanique de rupture
AbstractA method to predict the ultimate strength of adhesive joints has been evaluated for the quasi-static loading of a variety of cracked-lap shear (CLS) and single-lap shear (SLS) joints bonded with a high-strength, toughened epoxy adhesive. The adhesive strength was experimentally characterized in terms of the steady-state critical strain energy release rate, Gcs, as a function of the loading phase angle, using double cantilever beam (DCB) joints. Comparing the calculated energy release rate using the J-integral with the Gcs at the corresponding phase angle, the ultimate failure load in the fracture joint was predicted and compared with experimental results. When the toughening of the adhesive during subcritical crack growth (i.e. its R-curve behavior) was considered in the analysis, good agreement between the predicted and experimental failure loads was achieved, both for joints made with aluminum or steel adherends. The initial condition at the end of joint overlap (fillet or precrack) did not affect the ultimate joint strength because of the significant amount of subcritical crack growth.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Industrial Materials Institute
Peer reviewedYes
NRC number51111
NPARC number14475132
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Record identifierf0202d53-3cee-4fb4-ab16-06249c85a605
Record created2010-03-01
Record modified2016-05-09
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