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dc.contributor.authorYang, Chihdar Charles
dc.contributor.authorTomblin, John S.
dc.contributor.authorSalah, Lamia
dc.identifier.citationChihdar Yang, John S Tomblin, and Lamia Salah Stress model and strain energy release rate of a prescribed crack in scarf joint/repair of composite panels Journal of Composite Materials December 2015 49: 3635-3663en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractAn analytical model for stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was developed. The crack closure method was used to calculate the strain energy release rate at the crack tip after a prescribed crack was inserted at high adhesive stress locations. In the stress model, the first-order laminated plate theory was applied to the composite panels, including the following: (1) scarfed parent substrate and corresponding repair panel for a bonded scarf repair or (2) both adherend panels for a scarf joint, assuming a linear elastic adhesive. The bondline was presumed to be thin, so the adhesive stresses were presumed to be uniform through the thickness. The coupled second-order differential equations obtained via kinematics and force equilibrium were solved semi-numerically using the symbolic computational tool Maple. Finite element analyses using the commercial software ABAQUS were conducted for comparison purposes, and results correlated well with the developed analytical model. Experimental strain data of the bonded scarf repairs was also used to verify the developed model. It can be seen that the highest adhesive stresses occur at locations where high-stiffness plies are discontinued. The obtained strain energy release rate can be used for failure analysis if appropriate critical energy release rates in conjunction with proper mode mixture rule are used.en_US
dc.description.sponsorshipThis study was funded by the state of Kansas as part of the Kansas Aviation Research and Technology (KART) Growth Initiative.en_US
dc.publisherSAGE Publicationsen_US
dc.relation.ispartofseriesJournal of Composite Materials;v.49:no.29
dc.subjectStrain energy release rateen_US
dc.subjectBonded jointen_US
dc.subjectBonded repairen_US
dc.subjectComposite repairen_US
dc.subjectScarf jointen_US
dc.subjectCrack closure methoden_US
dc.subjectScarf repairen_US
dc.titleStress model and strain energy release rate of a prescribed crack in scarf joint/repair of composite panelsen_US
dc.rights.holderCopyright © 2015 by SAGE Publicationsen_US

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