期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-14128-8
关键词
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资金
- Office of Naval Research [N000141812494]
- National Science Foundation [Mechanics of Materials and Structures Program] [1562656]
- American Society of Mechanical Engineers [Haythornthwaite Research Initiation Grant]
- NASA Rhode Island Space Grant Consortium
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1562656] Funding Source: National Science Foundation
- U.S. Department of Defense (DOD) [N000141812494] Funding Source: U.S. Department of Defense (DOD)
The layered architecture of stiff biological materials often endows them with surprisingly high fracture toughness in spite of their brittle ceramic constituents. Understanding the link between organic-inorganic layered architectures and toughness could help to identify new ways to improve the toughness of biomimetic engineering composites. We study the cylindrically layered architecture found in the spicules of the marine sponge Euplectella aspergillum. We cut micrometer-size notches in the spicules and measure their initiation toughness and average crack growth resistance using flexural tests. We find that while the spicule's architecture provides toughness enhancements, these enhancements are relatively small compared to prototypically tough biological materials, like nacre. We investigate these modest toughness enhancements using computational fracture mechanics simulations.
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