ИСТИНА

Composite materials with sensing capabilities that can provide the information on their current condition constitute an important class of smart materials and are in high demand for structural evaluation and rehabilitation. This paper reviews recent results on novel sensory composites with embedded magnetic microwires showing large change in electrical impedance with respect to external magnetic field, mechanical stress, and temperature at microwave frequencies. The magnetic wires constitute electrodynamic subsystem within the composite host and the wave scattering from composite is influenced by the magnetic properties of wires. The transfer mechanism involves giant magnetoimpedance which can be larger than 100% with respect to external stimuli in Co-rich amorphous wires with negative magnetostriction. The wire diameter can be easily chosen within 10 to 20 microns without deteriorating its magnetic behavior, so the magnetic wires will not induce distortion on the reinforcing fibers. Finally, subsystems of different magnetic wires sensitive to various mechanic, thermal and magnetic stimuli can be multiplexed allowing the composite system with several responsive functions to be designed