Ultraductile Bar with Bioinspired Helical Strands
Publication: Journal of Structural Engineering
Volume 148, Issue 10
Abstract
Through natural selection, living systems have evolved elegant hierarchical structures with excellent mechanical properties and efficient biological functions. The helical tendrils of climbing plants are known for their intriguing geometry and superior deformability. Many engineering materials are vulnerable to plastic strain localization, and the efficiency of material usage can be significantly improved by suppressing strain localization. Inspired by plant tendrils, a novel structural design of ultraductile engineering materials is proposed in this work. A cylindrical metallic bar is considered as an example. In the proposed design, a number of strands are wound spirally about and bonded to the bar. The effectiveness of the design in improving the deformation capacity of the metallic bar is demonstrated by numerical simulations and experimental tests. In the postnecking process, the maximum principal strain in the composite bar is distributed more evenly than that in the bare bar. This work provides a way for improving the deformability and ductility of a diversity of engineering materials, which can prevent these materials from failing under excessive deformation.
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Data Availability Statement
All data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work is supported by the Victoria–Jiangsu Program for Technology and Innovation R&D, funded by the Department of Economic Development, Jobs, Transport and Resources, the state of Victoria, Australia, and the Australian Research Council (DP200100631 and DE200100887). Funding from Shenzhen Science and Technology Program (Grant No. KQTD20200820113004005) is also acknowledged.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Oct 28, 2021
Accepted: Apr 15, 2022
Published online: Jul 18, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 18, 2022
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