Thickness-dependent mechanical properties of nacre in Cristaria plicata shell:Critical role of interfaces  

作　　者：S.M.Liang H.M.Ji X.W.Li 

机构地区：[1]Department of Materials Physics and Chemistry,School of Materials Science and Engineering,Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang,110819,China

出　　处：《Journal of Materials Science & Technology》2020年第9期1-8,共8页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant No.51902043);the China Postdoctoral Science Foundation(Grant No.2018M641704);and the Fundamental Research Funds for the Central Universities(Grant No.N180203018);This work was also partially supported by the National Natural Science Foundation of China(Grant Nos.51571058 and 51871048).

摘　　要：The thickness dependence of mechanical properties of nacre in Cristaria plicata shell was studied under three-point bending tests.The results show that the mechanical behavior of nacre exhibits a strong thickness dependence.The bending strength firstly increases with the increase of specimen thickness and then becomes roughly constant as the thickness reaches a certain value of∼2.5mm.However,the mean value of work per unit volume increases constantly with increasing specimen thickness;meanwhile,the cracking mode changes from penetration into the platelets to deflection along the interfaces.The theoretical analyses indicate that the thickness-dependent mechanical properties of nacre are mainly caused by the variation in the number of inter-lamellar interfaces.The more the number of inter-lamellar interfaces is,the higher the strength and work of fracture of nacre under bending tests will be.However,as the number of inter-lamellar interfaces reaches a certain value(e.g.,in the present specimen with 2.5mm thickness),the strength tends to remain constant,while the work of fracture still increases.Therefore,the present research findings are expected to provide a valuable guidance for the interfacial design of nacre-like materials with high strength and toughness.

关 键 词：Cristaria plicata shell NACRE Mechanical property Thickness Interface 

分 类 号：TB302[一般工业技术—材料科学与工程]