Experimental and numerical study on the flexural mechanical properties of bioinspired composites with suture structures
Experimental and numerical study on the flexural mechanical properties of bioinspired composites with suture structures
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DOI：
10.1080/15376494.2022.2162644
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发表时间：
2023-01
影响因子：
2.8
通讯作者：
Fuchao Gao;Q. Zeng;Jing Wang;J. Ge;Jianbang Shen;Shuo Liu;Jun Liang
中科院分区：
文献类型：
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作者：
Fuchao Gao;Q. Zeng;Jing Wang;J. Ge;Jianbang Shen;Shuo Liu;Jun Liang
摘要本文以啄木鸟喙部的缝合线为灵感，提出了一种由刚性材料（模仿角蛋白）和柔性材料（模仿胶原蛋白）组成的复合结构。结合实验和数值模拟，研究了该结构的弯曲力学性能、变形和破坏模式，并与传统的层合结构进行了比较。首先，进行三点弯曲试验以表征机械性能，例如柔性、刚度、强度和能量耗散。实验结果证实，缝合线的结构影响弯曲性能显着。然后，建立了一个有限元（FE）模型来表示内部的应变和应力场的组合梁。应变分布表明缝线结构中存在剪切机制以耗散能量，而应力分布表明软层充当减震器以释放通过结构传递的应力。最后，对复合材料结构的破坏模式和增韧机理进行了探讨。负责生物结构的机械性能的机制可以推广到设计具有定制机械性能的架构。
Abstract Composite structures inspired by the suture line in the beak of woodpeckers, which is composed of stiff material (mimicking keratin) and compliant material (mimicking collagen), are proposed in this article. The flexural mechanical properties as well as the deformation and failure modes are investigated combining experiments and simulations, which are also compared with conventional laminated structures. First, three-point bending test is performed to characterize mechanical properties such as flexibility, stiffness, strength, and energy dissipation. Experimental results confirm that the suture structure affects the flexural properties significantly. Then, a finite element (FE) model is established to present the strain and stress fields inside the composite beams. The strain distribution demonstrates a shear mechanism in suture structures to dissipate energy, while the stress distribution reveals that the soft layers act as shock absorbers to release stress transmitted through the structure. At last, the failure mode and toughening mechanism of the composite structures is discussed. The mechanism responsible for the mechanical performance of biological structures can be generalized to design architectures with customized mechanical performances.