Mechanics of collagen-hydroxyapatite model nanocomposites

被引：49

作者：

Libonati, Flavia ^{[1
,2
]}

Nair, Arun K. ^{[2
]}

Vergani, Laura ^{[1
]}

Buehler, Markus J. ^{[2
]}

机构：

[1] Politecn Milan, I-20156 Milan, Italy

[2] MIT, Cambridge, MA 02139 USA

来源：

MECHANICS RESEARCH COMMUNICATIONS | 2014年 / 58卷

关键词：

Bone; Materiomics nanocomposites; Nanomechanics; Atomistic; Collagen; Hydroxyapatite; MOLECULAR-DYNAMICS; BONE; FIBRILS; NANOSCALE; TOUGHNESS; CONTINUUM; FRACTURE; SIMULATION; APATITES; DISEASE;

D O I：

10.1016/j.mechrescom.2013.08.008

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Bone is a hierarchical biological composite made of a mineral component (hydroxyapatite crystals) and an organic part (collagen molecules). Small-scale deformation phenomena that occur in bone are thought to have a significant influence on the large scale behavior of this material. However, the nanoscale behavior of collagen-hydroxyapatite composites is still relatively poorly understood. Here we present a molecular dynamics study of a bone model nanocomposite that consist of a simple sandwich structure of collagen and hydroxyapatite, exposed to shear-dominated loading. We assess how the geometry of the composite enhances the strength, stiffness and capacity to dissipate mechanical energy. We find that H-bonds between collagen and hydroxyapatite play an important role in increasing the resistance against catastrophic failure by increasing the fracture energy through a stick-slip mechanism. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：17 / 23

页数：7

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