Abstract
The mechanical characterization of textile composites is a challenging task, due to their nonuniform deformation and complicated failure phenomena. This article introduces a three-dimensional mesoscale finite element model to investigate the progressive damage behavior of a notched single-layer triaxially-braided composite subjected to axial tension. The damage initiation and propagation in fiber bundles are simulated using three-dimensional failure criteria and damage evolution law. A traction–separation law has been applied to predict the interfacial damage of fiber bundles. The proposed model is correlated and validated by the experimentally measured full field strain distributions and effective strength of the notched specimen. The progressive damage behavior of the fiber bundles is studied by examining the damage and stress contours at different loading stages. Parametric numerical studies are conducted to explore the role of modeling parameters and geometric characteristics on the internal damage behavior and global measured properties of the notched specimen. Moreover, the correlations of damage behavior, global stress–strain response, and the efficiency of the notched specimen are discussed in detail. The results of this paper deliver a throughout understanding of the damage behavior of braided composites and can help the specimen design of textile composites.
Highlights
Carbon fiber reinforced composite materials has some distinctive features in physical, mechanical, and thermal properties, such as high stiffness and strength to weight ratio, excellent resistance to fatigue, and corrosion
The results further prove the sensitivity of measured properties to specimen shape and the significance of free-edge effect in triaxially-braided composites
The results demonstrate the accessibility of using mesoscale finite element model as virtual testing for textile composites, which can significantly enhance the design efficiency of composite structures
Summary
Carbon fiber reinforced composite materials has some distinctive features in physical, mechanical, and thermal properties, such as high stiffness and strength to weight ratio, excellent resistance to fatigue, and corrosion. Materials 2019, 12, x FOR PEER REVIEW Textile composites such as braided or woven composites are known to have excellent damage. Excellent damage tolerance and impact resistance and areorincreasingly used in are aircraft structures. Tolerance and impact resistance and are increasingly used in aircraft structures [3]. Apart fromdesigned its superior impact the resistance property [4],fragments the two-dimensional triaxially-braided. Apart from its superior impact resistance property [4], the two-dimensional triaxially-braided composite shows excellent specific energy absorption property and is considered as an alternative composite for shows specific energy[5,6] The the two-dimensional triaxially-braided composite is introduced to fabricate the engine fan case two-dimensional triaxially-braided composite is introduced to fabricate the engine fan case structure, structure, which is mainly designed to contain the fan blade and its fragments during a blade failure which mainly to contain fan blade and its during a blade failure event. event. is
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