Sliding-before-breaking governs deformation in chitinous extracellular matrices reinforced by strong, fatigue-resistant chitin.
Controlled interfacial sliding, not covalent bond scission, drives irreversible deformation in chitinous extracellular matrices, enabling fatigue resistance and adaptability.
- Why it matters: Understanding how biological materials achieve both high strength and permanent shape change can inform the design of durable synthetic materials with similar properties, addressing a key challenge in materials science.
- What they did: The study combined multiscale simulations and experimental measurements on deep-sea tubeworm tubes, revealing that chitin's covalent backbone remains intact under physiological loads, with deformation primarily due to sliding at interfaces.
- The result: This sliding-before-breaking mechanism preserves structural integrity while allowing energy dissipation, providing a blueprint for creating hierarchical materials that are both fatigue-resistant and adaptable.