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http://hdl.handle.net/10397/106520
Title: | Spiral interface : a reinforcing mechanism for laminated composite materials learned from nature | Authors: | Gao, Y Guo, Z Song, Z Yao, H |
Issue Date: | Dec-2017 | Source: | Journal of the mechanics and physics of solids, Dec .2017, v. 109, p. 252-263 | Abstract: | Helical structures are ubiquitous in nature at length scales of a wide range. In this paper, we studied a helical architecture called microscopic screw dislocation (μ-SD), which is prevalently present in biological laminated composites such as shells of mollusks P. placenta and nacre of abalone. Mechanical characterization indicated that μ-SDs can greatly enhance resistance to scratching. To shed light on the underlying reinforcing mechanisms, we systematically investigated the mechanical behaviors of μ-SD using theoretical modeling in combination with finite element simulation. Our analysis on an individual μ-SD showed that the failure of a μ-SD under tension involves the delamination of the prolonged spiral interface, giving rise to much higher toughness compared to those of the planar counterpart. The corporation of multiple μ-SDs was further investigated by analyzing the effect of μ-SD density on the mechanical reinforcement. It was found that higher areal density of μ-SD would lead to more improvement in toughness. However, the operation of such reinforcing mechanism of μ-SD requires proclivity of cracking along the spiral interface, which is not spontaneous but conditional. Fracture mechanics-based modeling indicated that the proclivity of crack propagation along the spiral interface can be ensured if the fracture toughness of the interface is less than 60% of that of the lamina material. These findings not only uncover the reinforcing mechanisms of μ-SDs in biological materials but imply a great promise of applying μ-SDs in reinforcing synthetic laminated composites. | Keywords: | Bio-inspired materials Biomineralized materials Delamination Microscopic screw dislocation |
Publisher: | Elsevier Ltd | Journal: | Journal of the mechanics and physics of solids | ISSN: | 0022-5096 | EISSN: | 1873-4782 | DOI: | 10.1016/j.jmps.2017.09.002 | Rights: | © 2017 Elsevier Ltd. All rights reserved. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Gao, Y., Guo, Z., Song, Z., & Yao, H. (2017). Spiral interface: A reinforcing mechanism for laminated composite materials learned from nature. Journal of the Mechanics and Physics of Solids, 109, 252-263 is available at https://doi.org/10.1016/j.jmps.2017.09.002. |
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Yao_Spiral_Interface_Reinforcing.pdf | Pre-Published version | 1.66 MB | Adobe PDF | View/Open |
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