Helical Fiber Pull-out in Biological Materials  

作　　者：Lixin Wang Yuhong Cui Qinghua Qin Hui Wang Jianshan Wang 

机构地区：[1]Tianjin Key Laboratory of Modern Engineering Mechanics & Department of Mechanics, Tianjin University [2]Research School of Engineering, Australian National University [3]Department of Engineering Mechanics, Henan University of Technology

出　　处：《Acta Mechanica Solida Sinica》2016年第3期245-256,共12页固体力学学报（英文版）

基　　金：Project supported by the National Basic Research Program of China(No.2012CB937500);the National Natural Science Foundation of China(Nos.11272230,11472191 and 11172207)

摘　　要：Many biological materials, such as wood and bone, possess helicoid microstructures at microscale, which can serve as reinforcing elements to transfer stress between crack surfaces and improve the fracture toughness of their composites. Failure processes, such as fiber/matrix inter- face debonding and sliding associated with pull-out of helical fibers, are responsible mainly for the high energy dissipation needed for the fracture toughness enhancement. Here we present systemic analyses of the pull-out behavior of a helical fiber from an elastic matrix via the finite element method （FEM） simulation, with implications regarding the underlying toughening mechanism of helicoid microstructures. We find that, through their uniform curvature and torsion, helical fibers can provide high pull-out force and large interface areas, resulting in high energy dissipation that accounts, to a large extent, for the high toughness of biological materials. The helicity of fiber shape in terms of the helical angle has significant effects on the force-displacement relationships as well as the corresponding energy dissipation during fiber pull-out.Many biological materials, such as wood and bone, possess helicoid microstructures at microscale, which can serve as reinforcing elements to transfer stress between crack surfaces and improve the fracture toughness of their composites. Failure processes, such as fiber/matrix inter- face debonding and sliding associated with pull-out of helical fibers, are responsible mainly for the high energy dissipation needed for the fracture toughness enhancement. Here we present systemic analyses of the pull-out behavior of a helical fiber from an elastic matrix via the finite element method （FEM） simulation, with implications regarding the underlying toughening mechanism of helicoid microstructures. We find that, through their uniform curvature and torsion, helical fibers can provide high pull-out force and large interface areas, resulting in high energy dissipation that accounts, to a large extent, for the high toughness of biological materials. The helicity of fiber shape in terms of the helical angle has significant effects on the force-displacement relationships as well as the corresponding energy dissipation during fiber pull-out.

关 键 词：biological materials helicoid microstructures fiber pull-out energy dissipation toughness 

分 类 号：O346.1[理学—固体力学]