Study on Fatigue Performance of Composite Bolted Joints with Bolt-Hole Delamination

3rd International Conference on Mechanical and Aeronautical Engineering

机械制造;航空航天工程

Liu, M.J.^1 ; Yu, S.^1 ; Zhao, Q.Y.^1

State Key Laboratory of Structural Analysis for Industrial Equipment, School of Aeronautics and Astronautics, Dalian University of Technology, Dalian

116024, China^1

关键词: Cohesive zone methods;    Composite bolted joints;    Delamination damages;    Engineering works;    Fatigue life prediction;    Fatigue performance;    Multicontinuum theory;    Numerical strategies;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/326/1/012004/pdf
DOI  :  10.1088/1757-899X/326/1/012004

学科分类：航空航天科学

来源: IOP

【 摘 要 】

Fatigue performance of composite structure with imperfections is a challenging subject at present. Based on cohesive zone method and multi-continuum theory, delamination evolution response and fatigue life prediction of a 3D composite single-lap joint with a bolt-hole have been investigated through computer codes Abaqus and Fe-safe. Results from the comparison of a perfect composite bolted joint with another defect one indicates that a relatively small delamination damage around the bolt hole brings about significant degradation of local material performance. More notably, fatigue life of stress concentration region of composite bolted joints is highly sensitive to external loads, as an increase of 67% cyclic load amplitude leads to an decrease of 99.5% local fatigue life in this study. However, the numerical strategy for solving composite fatigue problems is meaningful to engineering works.