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Updated: Aug 3, 2025

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
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Bonding Mechanical Properties between SMA Fiber and ECC Matrix under Direct Pullout Loads.

Zhao Yang1,2, Xiaojun Gong1, Qing Wu1

  • 1School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China.

Materials (Basel, Switzerland)
|April 13, 2023
PubMed
Summary

Knotted shape memory alloy fibers (SMAF) in engineered cementitious composites (ECC) significantly enhance bond strength and superelasticity, achieving over 900 MPa pullout stress. This design maximizes SMAF performance in self-healing and self-centering materials.

Keywords:
bonding performanceengineered cementitious compositesshape memory alloy fibersuperelasticity

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Mechanical Engineering

Background:

  • Engineered Cementitious Composites (ECC) offer enhanced ductility and crack control.
  • Shape Memory Alloy Fibers (SMAF) provide superelasticity and self-centering capabilities.
  • Effective fiber-matrix bonding is critical for SMAF-ECC composite performance.

Purpose of the Study:

  • To investigate the bond behavior of SMAF within ECC.
  • To determine the influence of fiber geometry and bond length on SMAF pullout characteristics.
  • To optimize SMAF design for maximum superelasticity utilization in ECC.

Main Methods:

  • Experimental pullout tests were conducted on SMAF-ECC specimens.
  • Variables included SMA fiber diameter, end shape (straight, hook, knotted), and bond length.
  • Analysis focused on pullout stress-strain curves, maximum pullout stress, and fiber utilization rate.

Main Results:

  • Knotted-end SMAF exhibited maximum pullout stress exceeding 900 MPa, with over 80% fiber utilization.
  • Martensitic transformation was observed in knotted-end SMAF.
  • Increased bond length enhanced anchorage force for knotted-end SMAF.
  • Larger fiber diameter increased pullout stress but decreased fiber utilization.

Conclusions:

  • Knotted SMAF end design effectively leverages superelasticity in ECC.
  • Bond length and fiber diameter are key parameters influencing SMAF-ECC bond performance.
  • This research provides a foundation for optimizing SMAF-ECC composites.