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Fragmentation of Beaded Fibres in a Composite
Carol Winnifred Rodricks1, Israel Greenfeld1, Bodo Fiedler2
1Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 7610001, Israel.
Materials (Basel, Switzerland)
|February 15, 2022
Summary
Introducing polymer beads to fibre-matrix interfaces significantly boosts interfacial shear strength by 17.5%. This structural modification enhances composite performance and stabilizes fibre fragmentation, offering a novel approach beyond traditional chemical sizing.
Area of Science:
- Materials Science
- Composite Materials Engineering
Background:
- The fibre-matrix interface is critical for composite mechanical properties.
- Chemical sizing methods for interface enhancement have limitations.
Purpose of the Study:
- To investigate the use of polymer beads for structural interface modification in fibre-reinforced composites.
- To evaluate the impact of polymer beads on interfacial shear strength and fibre fragmentation.
Main Methods:
- Introduction of polymer beads along glass fibre-epoxy interfaces.
- Single fibre fragmentation test (SFFT) to measure interfacial shear strength.
- Analysis of fibre fragmentation patterns and fragment density.
Main Results:
- A 17.5% increase in interfacial shear strength was observed for beaded fibres compared to control fibres.
- Polymer beads stabilized the fibre fragmentation process, reducing scatter in fragment density.
- A critical number of beads (e.g., 4) may correlate with interfacial shear strength.
Conclusions:
- Structural modification of the fibre-matrix interface using polymer beads offers significant advantages over chemical sizing.
- Beaded fibres show potential for improved composite strength, toughness, and consistent fragmentation behaviour.
- The concept of a critical bead number warrants further investigation for characterizing interfacial properties.
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