Growth Ring-dependent Fracture Toughness of Sea Urchin Spines Estimated by Boundary Effect Model  

作　　者：Xiaona Liu Simin Liang Yingying Li Hongmei Ji Xiaowu Li 

机构地区：[1]Department of Materials Physics and Chemistry,School of Material Science and Engineering,Northeastern University,Shenyang 110819,China [2]Key Laboratory for Anistropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China [3]State key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China

出　　处：《Journal of Bionic Engineering》2022年第5期1472-1480,共9页仿生工程学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China[Grant No.51902043];the Fundamental Research Funds for the Central Universities[Grant No.N2102007,and N2102002]。

摘　　要：Although the fracture behavior of sea urchin spines has been extensively investigated,there is as yet a lack of quantitative estimation on the effect of growth rings on the fracture properties of sea urchin spines.In sea urchin spines,much denser pores present in growth rings rather than porous layers.The tensile strength and fracture toughness of sea urchin spine samples with different numbers of growth rings are measured by the Boundary Effect Model(BEM).The experimental results of single-edge notched three-point bending tests indicate that the BEM is an appropriate method to estimate the fracture toughness of the present porous sea urchin spines,and the number of growth rings plays an important role in the fracture properties of spines.Specifically,the tensile strength and fracture toughness of sea urchin spines can be significantly improved with the increase in the number of growth rings,and their fracture toughness can even reach a relatively high value compared with some other porous materials with an identical porosity.The present research findings are expected to provide a fundamental insight into the design of high-performance bionic materials with a highly porous structure.

关 键 词：Sea urchin spine Growth ring Boundary Effect Model Porous structure Tensile strength Fracture toughness 

分 类 号：Q81[生物学—生物工程]