Abstract
In this study, interfacial fracture toughness was investigated experimentally and numerically in laminated composite plates with different fiber reinforcement angles bonded with adhesive. The composite plates are four-layered and the layer sequence is [0º/θ]s. DCB test was applied to composite plates reinforced with epoxy resin matrix and unidirectional carbon fiber. The experimental sample model for the DCB test was made using the ANSYS finite element package program. In the numerical study, four layered composites were prepared in three dimensions. Under critical displacement value; mode I fracture toughness at the crack tip was calculated using VCC (virtual crack closure) technique. Numerical values consistent with experimental results have presented in graphical forms. At 60o and 75° the greatest fracture toughness was obtained. In addition, numerical results have shown that fiber orientation prevents the uniform distribution of stress on the interface crack tip and causes stress accumulation, especially at the edge of the plate.
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Abbreviations
- a :
-
Crack length
- a 0 :
-
Crack initial length
- b :
-
Plate width
- C :
-
Compliance
- E a :
-
Adhesive Young modulus
- E 1 :
-
Modulus of elasticity in the direction of reinforcement
- E 2 :
-
Modulus of elasticity in perpendicular direction to reinforcement direction
- G C :
-
Critical strain energy release rate
- G IC :
-
Fracture toughness
- G 12 :
-
Shear modulus
- n :
-
Linear slope
- P :
-
Load
- P C :
-
Critical load
- S :
-
Shear strength
- u :
-
Displacement in -x direction
- v :
-
Displacement in -y direction
- v a :
-
Poisson ratio of the adhesive
- v 12 :
-
Poisson ratio of the composite
- w :
-
Displacement in -z direction
- X :
-
Tensile strength
- δ :
-
Displacement
- δc :
-
Critical displacement
- Δa0 :
-
Crack length increment
- θ :
-
Fiber orientation angle
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Ilkay Ertugrul Bican received B.S. and M.S. degrees in the Department of Mechanical Engineering, Firat University, Elazig, Turkey in 2009 and 2016, respectively. He is currently mechanical engineer in the Provincial Directorate of Environment and City Planning, Elazig, Turkey. His research interests include fiber reinforced composites and fracture mechanics.
Mete Onur Kaman received B.S. and M.S. degrees in the Department of Mechanical Engineering, Firat University, Elazig, Turkey in 1999 and 2000, respectively. He received her Ph.D. degree in the Department of Engineering Science, Middle East Technical University, Ankara, Turkey in 2006. He is currently a Professor in the Department of Mechanical Engineering, Firat University, Elazig, Turkey. His research interests include facture mechanics, fiber reinforced composites, failure analysis.
Serkan Erdem received B.S. degree in the Department of Mechanical Engineering, Selcuk University, Konya, Turkey in 2006. He received her M.S. degree in the Department of Mechanical Engineering, Firat University, Elazig, Turkey in 2006. He is currently a postdoctoral researcher in the same department. His research interests include buckling, fiber reinforced composites, failure analysis, biomechanics.
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Bican, I.E., Kaman, M.O. & Erdem, S. Effect of fiber orientation on interfacial fracture toughness for adhesively bonded composite plates. J Mech Sci Technol 34, 757–764 (2020). https://doi.org/10.1007/s12206-020-0123-6
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DOI: https://doi.org/10.1007/s12206-020-0123-6