Structural and Mechanical Characterization ofAtrina Pectinata and Freshwater Mussel Shells

作     者：Jianlu Lv Yonggang Jiang Deyuan Zhang 

作者机构：School of Mechanical Engineering and Automation Beihang University Xueyuan Road No. 37 Haidian District Beij'ing 1 00191 China International Research Institute for Multidisciplinary Science Beihang University Xueyuan Road No. 37 Haidian District Belling 100191 China 

出 版 物：《Journal of Bionic Engineering》 (仿生工程学报（英文版）)

年 卷 期：2015年第12卷第2期

页      面：276-284页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 0832[工学-食品科学与工程（可授工学、农学学位）] 090601[农学-基础兽医学] 08[工学] 09[农学] 0906[农学-兽医学] 0836[工学-生物工程] 083204[工学-水产品加工及贮藏工程] 0702[理学-物理学] 

基　　金：This work is partly supported by the National Natural Science Foundation of China （No.51205012）  Beijing Nova Program （No.Z141104001814035）  and National Higher-education Institution General Research and Development Project. The authors would like to thank Dr. Zhaodong Li from Central Iron ＆ Steel Re- search Institue of China for assistance on nanoindenta- tion testing. 

主　　题：shell prismatic fracture toughness organic matrix crack 

摘      要：The microstructures ofAtrina pectinata and freshwater mussel shells are investigated by optical microscopy and scanning electron microscopy. The mechanical properties of these shells are characterized by nanoindentation and three-point bending tests. Results show that both shells possess a prismatic microstructure mainly composed of columnar crystals and an organic matrix. The fracture toughness of the prismatic structure of Atrina pectinata and freshwater mussel are approximately 1.15 MPa.m1/2 and 0.87 MPa.m1/2, respectively, while the fracture toughness of natural calcite is approximately 0.2 MPa.m1/2. Calculated results from indentations agree with those obtained from the three-point bending tests. The columnar crystal material shows excellent fracture toughness due to grain refinement. In addition, the organic matrix of the prismatic layer can arrest cracks, and thereby improves the fracture toughness.