Effect of Short-Fiber Orientation on the Tensile Strength of Epoxy Adhesives

Short-glass-fiber-reinforced adhesives are state-of-the-art materials used in the bond lines of wind turbine blades. Various alignments of the short fibers are emerging, which depend on the adhesive flow during the application and joining processes. This induces a spectrum of direction-dependent mec...

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Veröffentlicht in:AIAA journal 2024-08, Vol.62 (8), p.2934-2942
Hauptverfasser: Holst, Tobias, Englisch, Nils, Antoniou, Alexandros, Manousides, Nikolas, Balzani, Claudio
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container_end_page 2942
container_issue 8
container_start_page 2934
container_title AIAA journal
container_volume 62
creator Holst, Tobias
Englisch, Nils
Antoniou, Alexandros
Manousides, Nikolas
Balzani, Claudio
description Short-glass-fiber-reinforced adhesives are state-of-the-art materials used in the bond lines of wind turbine blades. Various alignments of the short fibers are emerging, which depend on the adhesive flow during the application and joining processes. This induces a spectrum of direction-dependent mechanical properties. The tensile strength, for instance, can vary by about 20% depending on the load direction. Therefore, the adhesive performance, which is normally determined under controlled laboratory conditions and implemented in bond line design routines, can deviate from the in situ application. This work investigates the effect of the short-fiber alignment on the tensile strength distribution of an industry-standard adhesive used in wind turbine rotor blades. The smeared short-fiber orientation of the tensile specimens tested is estimated locally near the damaged surface using a material model that is fed with thermomechanical measurements and calibrated via micro-computed-tomography analysis. A linear correlation between tensile strength and short-fiber alignment has been identified. This augments the identification of the material’s upper and lower strength limits for bond line design purposes.
doi_str_mv 10.2514/1.J063879
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Various alignments of the short fibers are emerging, which depend on the adhesive flow during the application and joining processes. This induces a spectrum of direction-dependent mechanical properties. The tensile strength, for instance, can vary by about 20% depending on the load direction. Therefore, the adhesive performance, which is normally determined under controlled laboratory conditions and implemented in bond line design routines, can deviate from the in situ application. This work investigates the effect of the short-fiber alignment on the tensile strength distribution of an industry-standard adhesive used in wind turbine rotor blades. The smeared short-fiber orientation of the tensile specimens tested is estimated locally near the damaged surface using a material model that is fed with thermomechanical measurements and calibrated via micro-computed-tomography analysis. A linear correlation between tensile strength and short-fiber alignment has been identified. 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subjects Adhesive bonding
Alignment
Computed tomography
Epoxy adhesives
Fiber orientation
Fiber reinforced polymers
Glass fiber reinforced plastics
Glass-epoxy composites
Mechanical properties
Orientation effects
Rotor blades
Rotor blades (turbomachinery)
Short fibers
Tensile strength
Thermomechanical analysis
Turbine blades
Wind damage
Wind effects
Wind turbines
title Effect of Short-Fiber Orientation on the Tensile Strength of Epoxy Adhesives
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