Mechanical Properties of a Novel Ultraductile Composite Bar with Spirally Wound FRP Strands
Publication: Journal of Composites for Construction
Volume 28, Issue 6
Abstract
Enhancing the strength and ductility of metallic materials simultaneously is crucial for numerous industrial applications, yet it remains a formidable challenge due to the typical trade-off between these two properties. This study introduces an innovative approach to surmount this challenge by employing a composite bar design that leverages necking inhibition mechanisms for simultaneous improvements in both strength and ductility. The composite bars, comprising aluminum cores reinforced with spirally wound fiber-reinforced polymer (FRP) strands, were fabricated in various configurations to investigate different necking behaviors. Through uniaxial testing, the composite bars exhibited notable increases in both strength and ductility, attributed to the strategic design of the FRP winding angle and FRP content. This design effectively modulates the necking behavior, thereby enhancing the composite bars’ mechanical properties. Analysis of the strain distribution further elucidated the role of the spiral FRP strands in necking prevention. The composite bar design method outlined in this study offers a viable strategy for enhancing the mechanical performance of metallic materials, significantly reducing the risk of abrupt failure under high loads and deformations.
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Data Availability Statement
All data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work described in this paper was financially supported by the National Natural Science Foundation of China (Grant No. 52078299) and the Shenzhen Science and Technology Program (Grant No. KQTD20200820113004005).
Notation
The following symbols are used in this paper:
- Ab
- instantaneous sectional area of the metallic bar (mm2);
- Afrp
- total cross-sectional area of the FRP strands (mm2);
- d
- diameter of the metallic bar (mm);
- Ea
- Young’s modulus of adhesive (MPa);
- Efrp
- Young’s modulus of FRP (MPa);
- Efrp1
- first elastic module of PET FRP (MPa);
- Efrp2
- second elastic module of PET FRP (MPa);
- Esteel
- Elastic modulus of A6061 (MPa);
- ea
- elongation of adhesive;
- F
- cumulative load resistance (kN);
- fca
- compression strength of adhesive (MPa);
- ffrp
- tensile strength of PET FRP (MPa);
- fta
- tensile strength of adhesive (MPa);
- fu
- peak strength of metallic bar (MPa);
- fy
- yield strength of metallic bar (MPa);
- Ma
- flexure strength of adhesive (MPa);
- Pu
- peak load (kN);
- rb
- initial radius of the metallic bar (mm);
- rp
- distance between the center of the FRP strands and the center of the bare bar (mm);
- tfrp
- nominal thickness of PET FRP sheets (mm);
- ɛb
- local axial strain at necking region;
- ɛf
- tensile strain of PET FRP strands;
- ɛfrp
- rupture strain of PET FRP from coupon tests;
- ɛn
- ultimate fracture strain of metallic bar;
- ɛs
- ultimate engineering strain;
- ɛtran
- transition strain of PET FRP;
- θs
- spiral angle of PET FRP strands (°);
- θs0
- initial spiral angle of PET FRP strands (°); and
- σb
- true stress at the necking position (MPa).
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Published In
Journal of Composites for Construction
Volume 28 • Issue 6 • December 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 1, 2023
Accepted: Jun 10, 2024
Published online: Aug 28, 2024
Published in print: Dec 1, 2024
Discussion open until: Jan 28, 2025
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