真海鞘被嚢应激变刚度性能的研究
首发时间:2017-01-12
摘要:近年来,工程中对可变刚度特种材料的需求极为迫切,国际上对各类可变刚度材料进行了广泛的研究。真海鞘被嚢在受到外力刺激后刚度增加,这一能力使得真海鞘能够适应海底恶劣的生存环境。研究这一现象对仿生变刚度材料在工程领域中的应用有着重要的意义。本文通过对活体真海鞘在外力刺激前后被嚢承载力的测试,发现刺激后真海鞘被嚢的承载能力在可以提升约2倍。随后利用电镜技术观察到真海鞘被嚢多层的纤维素网络结构,并对纤维素网络的吸水能力进行了实验。最后对干燥和吸水状态下的真海鞘被嚢进行了应力应变性能测试,发现在应变超过2%之后,吸水状态下的真海鞘被嚢的刚度明显快速增加。经过初步分析,被嚢中包裹的液体因为被嚢的拉伸而受到挤压,使得自身的体积模量增加,最后导致真海鞘被嚢刚度增加。本文的研究丰富了可变刚度仿生材料的研究思路,同时也为可变刚度材料制备领域的创新与发展做出了探索。
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Mechanism research on Halocynthia roretzi dermis' stiffness-changes ability
Abstract:In recent years, the variable stiffness special material was extremely needed, and a lot of attention was paid to the research of variable stiffness material in the world. Halocynthia roretzi dermis(HRD) just embrace an ability to change its stiffness in response to mechanical stimulation, which can help the Halocynthia roretzi adapt to the harsh environment on sea floors. To deeply study this ability will greatly contribute to the development of variable stiffness material in engineering applications. In this paper, we tested the bearing capacity of live Halocynthia roretzi before and after mechanical stimulation, and as a result, the bearing capacity was promoted to be about 2 times after stimulation. Then, we found multi-layer cellulose network microstructure in the HRD with scanning electron microscope and tested the water storage capacity of the network. Finally, we experiment with freeze-dried HRD and water-filled HRD, and obtained the stress and strain results: when the strain exceed 2%, the stiffness of the water-filled HRD increased obviously. In our preliminary analysis, the stretching of HRD caused the bulk modulus of liquid in HRD significantly rapidly increased on the squeezing of the cellulose network, and result in the stiffness increase of HRD. The new mechanism enrich the research idea, and make an exploration for the innovation and development in the field of variable stiffness bionic materials material manufacturing.
Keywords: Halocynthia roretzi dermis variable stiffness bulk modulus
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No.4716828117783214****
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