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Efficient Toughening of Short-Fiber Composites Using Weak Magnetic Fields
Omri Goldberg1, Israel Greenfeld1, Hanoch Daniel Wagner1
1Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel.
Materials (Basel, Switzerland)
|May 30, 2020
Summary
Weak magnetic fields enhance composite toughness by concentrating short glass fibers near stress regions. This localized reinforcement improves fracture resistance without adding new materials.
Area of Science:
- Materials Science
- Composite Materials
- Mechanical Engineering
Background:
- Short fibers enhance composite toughness via energy dissipation during fracture.
- Improving toughness requires directing fibers to highly stressed regions.
- Current methods lack efficient control over fiber localization.
Purpose of the Study:
- To investigate the use of weak magnetic fields for enhancing composite fracture toughness.
- To control fiber orientation and concentration in an epoxy matrix reinforced with short magnetized glass fibers.
- To achieve localized reinforcement near crack tips.
Main Methods:
- Utilizing weak magnetic fields to direct and concentrate magnetized glass fibers within an epoxy matrix.
- Controlling fiber orientation with magnetic field vector components.
- Controlling fiber concentration with magnetic field intensity gradients.
- Employing two pairs of permanent magnets for optimized reinforcement.
Main Results:
- Optimized fracture toughness significantly exceeded reference values obtained without magnetic fields.
- Achieved enhanced toughness by combining fiber concentration at the crack tip with alignment along the load direction.
- Magnetic field-induced localization outperformed unidirectional alignment without translation using a solenoid.
Conclusions:
- Localized reinforcement using magnetic translation of fillers is an effective method for improving composite fracture toughness.
- This technique allows for controllable enhancement of fracture resistance without additional materials.
- The magnetic gradient approach offers a novel way to tailor composite performance.
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