A nonlinear viscoelastic fracture analysis of concrete/FRP delamination in aggressive environments |
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Authors: | Soojae Park Kenneth M Liechti Samit Roy |
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Affiliation: | (1) Department of Aerospace Engineering and Engineering Mechanics, Center for the Mechanics of Solids Structures & Materials, University of Texas, Austin, TX 78712, USA;(2) IBM T. J. Watson Research Center, Yorktown Heights, NY 10598, USA;(3) Aerospace Engineering & Mechanics, University of Alabama, Tuscaloosa, AL 35487-0280, USA |
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Abstract: | In this paper, the durability of the bondline between concrete and FRP reinforcement was characterized at various temperature
and humidity levels. The linear and nonlinear viscoelastic constitutive behavior of the epoxy bondline was characterized and
used for a nonlinear viscoelastic fracture analysis of delamination. A hygrothermal nonlinear viscoelastic pseudo-stress model
was developed and calibrated in order to compute a generalized J integral. Driven wedge tests were conducted for examining the fracture behavior of the interface. A finite element analysis
was developed for determining the cohesive zone size and the generalized J integral at various temperature and humidity levels. The fracture energy obtained from these parameters greatly depended
upon crack growth rate, temperature and humidity. |
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Keywords: | Viscoelastic Hygrothermal Durability Fracture energy Cohesive zone |
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