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Influence of inter‐fiber spacing and interfacial adhesion on failure of multi‐fiber model composites: Experiment and numerical analysis
Author(s) -
Li Hongzhou,
Jia Yuxi,
Luan Shifang,
Xiang Qian,
Han Charles C.,
Mamtimin Geni,
Han Yanchun,
An Lijia
Publication year - 2008
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20487
Subject(s) - materials science , composite material , birefringence , fracture (geology) , epoxy , fiber , glass fiber , tension (geology) , stress (linguistics) , shear (geology) , adhesion , stress concentration , fracture mechanics , ultimate tensile strength , optics , linguistics , philosophy , physics
The uniaxial tension experiments on glass‐fiber‐reinforced epoxy matrix composites reveal that the fragmentations of fibers display vertically aligned fracture, clustered fracture, coordinated fracture, and random fracture with the increase of inter‐fiber spacing. The finite element analysis indicates that the fragmentations of fibers displaying different phenomena are due to the stress concentration as well as the inherent randomness of fiber defects, which is the dominant factor. The experimental results show that matrices adjacent to the fiber breakpoints all exhibit birefringent‐whitening patterns for the composites with different interfacial adhesion strengths. The larger the extent of the interfacial debonding, the less the domain of the birefringent‐whitening patterns. The numerical analysis indicates that the orientation of the matrix adjacent to a fiber breakpoint is caused by the interfacial shear stress, resulting in the birefringent‐whitening patterns. The area of shear stress concentrations decides on the domain of the birefringent‐whitening patterns. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers