Research on Magnetic Field-Based Damage Detection Technology for Ferromagnetic Microwires

Area of Science:

• Materials Science
• Structural Health Monitoring
• Non-Destructive Testing

Background:

• Composite materials are susceptible to internal damage from operational stress, affecting structural integrity.
• Ferromagnetic materials offer a sensitive method for detecting magnetic field variations.
• Embedded ferromagnetic microwires can serve as internal sensors for damage detection.

Purpose of the Study:

• To develop a method for assessing composite material health using embedded ferromagnetic microwires.
• To investigate the relationship between structural damage (cracks) and magnetic signal changes.
• To establish a basis for evaluating the serviceability and overall health of composite structures.

Main Methods:

• Development of a theoretical numerical model for magnetic field intensity at crack sites.
• Utilizing finite element analysis to study magnetic characteristic variations in ferromagnetic microwires near cracks.
• Analyzing magnetic signal patterns under varying conditions (angle, depth, width, multiple cracks, external field strength).

Main Results:

• Magnetic signal patterns correlate linearly with crack angle and depth.
• Crack width influences magnetic signals non-linearly, with stabilization at certain widths.
• Magnetic signals show distinct patterns for single vs. multiple cracks and respond linearly to external magnetic field strength.

Conclusions:

• Variations in magnetic signals from embedded ferromagnetic microwires can accurately indicate the presence and characteristics of structural damage in composite materials.
• The established magnetic signal analysis provides a foundation for non-destructive evaluation of composite material health.
• This technique aids in determining the continued serviceability of damaged composite structures.