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Mechanically Driven Bacteria-Based Crack Detection
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DOI：10.1039/D5MA01053E.png)
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Abstract
En 中文
Early detection of fatigue cracking is crucial to extend the life-cycle of materials and structures. To reduce the risk of fatigue; parts are often over-engineered or retired early; leading to material waste. Current methods for crack detection; including strain sensors or ultrasonic testing; can be costly; require regular maintenance; and do not respond to cracks directly via a repair mechanism. People are leveraging biology to create materials that can sense and respond. Engineered living materials have been primarily limited to porous matrices and hydrogels; which facilitate viability of organisms. We present an engineered living coating that can be applied to conventional structural materials to detect cracks. The coating integrates bacterial spores into a tailored synthetic matrix. This biohybrid coating approach unlocks potential; beyond crack detection; for crack mitigation through leveraging the biological component. This study: 1) describes the design of a spore-polymer coating for in situ crack detection for structural materials and 2) demonstrates detection for different loading mechanisms; geometries; and materials. This work demonstrates how living materials can be used to enhance conventional materials and creates a valuable approach for crack detection. Our coating will reduce waste; increase product lifespan; and improve safety by preventing failure due to cracks.
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