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Self-sensing composites performance largely relies on the sensing fillersproperty and interface. Our previous work demonstrates that the microwires canenable self-sensing composites but with limited damage detection capabilities.Here, we propose an optimization strategy capitalizing on dual interfacesformed between glass-coat and metallic core (inner interface) and epoxy matrix(outer interface), which can be decoupled to serve different purposes whenexperiencing stress; outer interfacial modification is successfully appliedwith inner interface condition preserved to maintain the crucial circulardomain structure for better sensitivity. We found out that the damage detectioncapability is prescribed by periodical structural integrity parameterized bycracks number and location in the case of damaged wires; it can also beoptimized by stress transfer efficiency with silane treated interface in thecase of damaged matrix. The proposed self-sensing composites enabled by aproperly conditioned dual-interfaces are promising for real-time monitoring inrestricted and safety-critical environments.

A self-sensing microwire/epoxy composite optimized by dual interfaces and periodical structural integrity