Pullout of the Cylindrical Helicoidal Fiber

Chenhan Hu ¹Weihao Tao ¹Hongjun Yu ²Qinghua Qin ³Jianshan Wang¹

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作者信息

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 Mechanics,Tianjin University,Tianjin 300054,China;Department of Materials Science,Shenzhen MSU-BIT University,Shenzhen 518172,China
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Abstract

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.

Key words

Cylindrical helicoidal fiber structure/Cylindrically monoclinic material/Helical winding of fiber/Pullout/Interlayer stress transfer

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基金项目

National Natural Science Foundation of China(12020101001)

National Natural Science Foundation of China(12021002)

National Natural Science Foundation of China(12372324)

National Natural Science Foundation of China(12272239)

National Innovation and Entrepreneurship Training Program for College Students(202210056136)

出版年

2024

固体力学学报(英文版)

中国力学学会

固体力学学报(英文版)

影响因子：0.214

ISSN：0894-9166

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