Self-healing composite maintains near-92% sensing response after 10,000 cycles

Lab-scale composite for structural health monitoring shows durable strain-sensing capability in bridge and building applications

A self-healing polymer composite developed by Xuan Wang et al. maintains near-92% piezoresistive sensing response after 10,000 strain cycles at 50% strain. This material uses thermoplastic polyurethane with UPy (2-ureido-4[1H]-pyrimidinone) units that form reversible quadruple hydrogen bonds, combined with modified silica and functionalized multi-walled carbon nanotubes as fillers. The research, published in the International Journal of Materials and Product Technology in 2026, demonstrates this composite’s potential for structural health monitoring in bridges and buildings by reducing maintenance needs.

The reversible hydrogen bonding network enables the material to recover from deformation while retaining sensing capability. This durability addresses a key challenge in structural monitoring systems where repeated stress cycles typically degrade sensor performance. The composite’s ability to maintain function through thousands of cycles could lower long-term maintenance costs and failure risks for critical infrastructure.

This development moves toward cheaper, more reliable structural monitoring—potentially reducing maintenance costs and failure risks for bridges and buildings. However, the performance was tested at 50% strain (not full strain range), the 2026 publication date indicates future implementation, and the source provides no quantified cost savings or risk reduction metrics. Real-world deployment and cost benefits remain unverified at this stage.

Source: Phys.org