Effective modulus of biological staggered nanocomposites with interface stress effect. (1st June 2019)

• Record Type: Journal Article
• Authors: Dong, Leiting; Chao, Cezhou; Yan, Peng
• Is Part Of: Composites. Number 166(2019)
• Page Start: 701
• Page End: 709
• Publication Date: 2019-06-01
• Subjects: Biological nanocomposites -- Staggered nanostructure -- Tension-shear chain model -- Interface stress effect -- Effective modulus; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2019.03.001
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Biological composites with staggered matrix–platelet nanostructures, such as bone, teeth and nacre, possess superior mechanical properties. The interface property between mineral platelets and protein matrix at nanoscale is one of the key factors influencing effective properties of such nanocomposites. In this study, based on the Gurtin-Murdoch model, two tension-shear chain models (TSCMs) considering the interface stress effect are established to analyse the influence of interface stress effect on the effective Young's modulus of the staggered nanocomposites. One is the TSCM without tension region between two adjacent hard platelets, while another is with tension region. Two explicit formulae of effective Young's modulus of the nanocomposites are derived based on the two TSCMs. Meanwhile, an interface factor reflecting the combined influence of the platelet thickness and interface-platelet modulus ratio is also abstracted. The validity and accuracy of the two TSCMs are verified by comparing with the finite element simulations. Both the explicit formulae and the finite element simulations show that the interface stress effect has significant influence on the effective modulus, when the absolute value of the interface factor is large. For a given interface modulus, the interface effect on the effective modulus becomes more significant with decreasing the internal structure size of the nanocomposites to nanoscale.