Correlation between Microstructure and Toughness of Crab Carapace
Crab carapace is a kind of biomaterial in nature. It behaves favorable strength, stiffness and fracture toughness, which are closely related to its fine microstructure. The observation of scanning electron microscope (SEM) on the carapace of a Cyclodorippoidea crab shows that the carapace is a kind of natural bioceramic composite consisting of calcite crystal layers and collagen protein matrix. The observation also shows that the calcite crystal layers consist further of long and thin calcite crystal sheets and that all the calcite crystal sheets are arranged in a kind of parallel distribution. The maximum pullout energy of the calcite crystal sheets, which is closely related to the fracture toughness of the carapace, is investigated based on the representative model of the parallel distribution. It shows that the long and thin shape as well as the parallel distribution of the calcite crystal sheets enhance the maximum pullout energy and ensure the high fracture toughness of the carapace.
Crab carapace calcite crystal sheet microstructure pullout energy
Bin CHEN Dagang YIN Quan YUAN Jinghong FAN
College of Resource and Environment Science, Chongqing University, Chongqing 400044, China Key Labor College of Resource and Environment Science, Chongqing University, Chongqing 400044, China Division of Mechanical Engineering, Alfred University, Alfred, N Y 14802, USA
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
395-399
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）