Energy Absorption in Functionally Graded Concrete Bioinspired by Sea Urchin Spines
Energy Absorption in Functionally Graded Concrete Bioinspired by Sea Urchin Spines作者机构：Institute for Lightweight Structures and Conceptual Design (ILEK) Stuttgart Universitat 70569 Stuttgart Germany Institute for Geoscience (IFG) Applied Mineralogy Eberhard-Karls-Universitat Tubingen 72074 Tubingen Germany
出 版 物：《Journal of Bionic Engineering》 (仿生工程学报（英文版）)
年 卷 期：2017年第14卷第2期
页 面：369-378页
核心收录：
学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学]
主 题：biomimetic engineering energy absorption sea urchin spine functionally graded concrete graceful failure behaviour
摘 要：Functionally Graded Concrete （FGC） is fabricated at the Institute for Lightweight Structures and Conceptual Design （ILEK） by using a layer-by-layer technique with two different technological procedures： casting and dry spraying. Functional gradations are developed from two reference mixtures with diametrically opposed characteristics in terms of density, porosity, compression strength and elasticity modulus. In this study the first mixture consists of Normal Density Concrete （NDC）, with density about 2160 kg·m^-3 while the second mixture helps to obtain a very lightweight concrete, with density about 830 kg·m^-3. The FGC specimens have layers with different alternating porosities and provide superior deformability capacity under bulk compression compared to NDC specimens. In addition, the FGC specimens experienced a graceful failure behaviour, absorbing high amounts of energy during extended compression paths. The porosity variation inside the layout of tested specimens is inspired by the internal structure of sea urchin spines of heterocentrotus mammillatus, a promising role model for energy absorption in biomimetic engineering.
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