Abstract
Three-dimensional textile fabrics are used as the reinforcing phase of the textile structural composites, and their geometry affect the physical and mechanical properties of composites. Based on the curvature and directions of the fiber tows in three-dimensional textile fabrics, four representative geometric units are proposed, namely, the orthogonal geometric unit, the curved geometric unit, the skew geometric unit, and the uniform distribution unit, respectively. Other units are the combinations or derivations of these representative geometric units. The relationship and performance characteristics of these representative geometric units are discussed in section “The relationship of RGUs.” The structural features of three-dimensional textile fabrics are illustrated on the mesoscopic scale, and the models are established to predict the geometric properties. The concepts of fabrics with stable structure, flexible structure, elastoplastic structure, and uniform structure are proposed. The fiber volume fractions and elastic characteristics of different structural fabrics are discussed. The classification of three-dimensional textile fabrics is conducive to investigate the relationship between geometry and property, forming a technical system and providing a theoretical basis for the selection of three-dimensional structural textile composites with different performance.
Highlights
Three-dimensional (3D) textile structural composites have attracted increasing attention in various branches because the textile fabrics as the reinforcing phase show the excellent mechanical properties.[1]
Textile structural composites could be divided into two-dimensional (2D) and 3D textile structural composites according to the fiber tows in the thickness direction of textile fabrics. 3D textile fabrics have been used as the reinforcing phase of the textile structural composites, and their geometry influenced the physical and mechanical properties of the composites.3 3D textile composites, overcoming the low interlaminar mechanical properties of laminar composites, have become an important branch of high-performance composites. 3D textile fabrics could be classified based on various parameters depending on the
The aim of this study is to propose a new method to classify the 3D textile fabrics
Summary
Three-dimensional (3D) textile structural composites have attracted increasing attention in various branches because the textile fabrics as the reinforcing phase show the excellent mechanical properties.[1]. The representative geometric units (RGUs) are deduced based on the curvature and direction of the fiber tows in 3D textile fabrics. In order to predict the fiber volume fraction of the curved geometric unit, the length of curved fiber tows must be calculated. The final unit is obtained by the two types of RGUs. The other units in 3D textile fabrics can be regarded as the “genomic assemblies” of basic characteristics of these RGUs. The shape of cross section is multiple, and the same type fiber tows represent consistency. The fiber volume fraction affects the properties of 3D rectangular textile composites, and the value of assembled units can be predicted based on the aforementioned formulas. In order to predict the elastic properties of the relevant composites, the flexibility matrix or stiffness matrix of fiber tows in 3D rectangular textile fabrics need to be calculated. The elastic constants of 3D textile composites can be deduced based on the different mechanical analysis models
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