In this work, mechanical properties of veins and membrane of dragonfly wing were studied by means of optical/electron microscopy, tensile test and nano-indentation. It indicates that veins exhibit significantly higher strength and elastic modulus, as compared with membrane. Furthermore, finite element analysis (FEA) demonstrates that the fluctuation of Von Mises stress and displacement between varying models is undermined, due to presence of the membrane, indicating higher stability. Consequently, according to FEA of varying models involving presence of membrane, the membrane in dragonfly wing not only provides the capability to fly, but also improves obviously the strength and stability of wing structure, despite of its significantly low strength and elastic modulus. It is found that based on proper biomimetic design, bioinspired rigid-flexible coupling structure exhibits superior strength and stability, as compared with conventional rigid structure, which will provide great potential to make novel, smart, and functional structures.

本工作通过光学/电子显微镜、拉伸试验和纳米压痕研究了蜻蜓翅膀的纹理和膜的力学性能。这表明与膜相比，静脉表现出明显更高的强度和弹性模量。此外，有限元分析(FEA) 表明，由于膜的存在，不同模型之间的 Von Mises 应力和位移的波动被削弱，表明稳定性更高。因此，根据涉及薄膜存在的各种模型的有限元分析，蜻蜓翅膀中的薄膜不仅提供了飞行能力，而且尽管其强度和弹性模量明显较低，但也显着提高了机翼结构的强度和稳定性。研究发现，基于适当的仿生设计，与传统刚性结构相比，仿生刚柔耦合结构表现出优异的强度和稳定性，这将为制造新颖、智能和功能性结构提供巨大潜力。