Pullout of the Cylindrical Helicoidal Fiber  

作　　者：Chenhan Hu Weihao Tao Hongjun Yu Qinghua Qin Jianshan Wang 

机构地区：[1]Department of Mechanics,Tianjin University,Tianjin,300054,China [2]Department of Astronautic Science and Mechanics,Harbin Institute of Technology,Harbin,150001,China [3]Department of Materials Science,Shenzhen MSU-BIT University,Shenzhen,518172,China

出　　处：《Acta Mechanica Solida Sinica》2024年第3期444-456,共13页固体力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12020101001,12021002,12372324,and 12272239);supported by the National Innovation and Entrepreneurship Training Program for College Students(No.202210056136).

摘　　要：The multi-layer cylindrical helicoidal fiber structure(MCHFS)exists widely in biological materials such as bone and wood at the microscale.MCHFSs typically function as reinforcing elements to enhance the toughness of materials.In this study,we establish a shear lag-based pullout model of the cylindrical helicoidal fiber(CHF)for investigating interlayer stress transfer and debonding behaviors,with implications regarding the underlying toughening mechanism of MCHFS.Based on the shear lag assumptions,analytical solutions for the stress and displacement fields of the MCHFS during the pullout are derived by considering the CHF as a cylindrically monoclinic material and verified through the 3D finite element simulation.It is found that the helical winding of CHF results in both axial and hoop interlayer shear stresses.Both the helical winding angle and the elastic moduli of the fiber and matrix have significant influences on interlayer stress transfer.This work reveals a new interlayer stress transfer mechanism in the MCHFS existing widely in biological materials.

关 键 词：Cylindrical helicoidal fiber structure Cylindrically monoclinic material Helical winding of fiber PULLOUT Interlayer stress transfer 

分 类 号：O34[理学—固体力学]