Aramkan and Roye, used spacer fabrics to reinforce concrete and investigated the compression behavior of reinforced concrete. , studied the mechanical properties of thermoplastic composite reinforced with flat knitted 3D multi-layer spacer fabric. , studied the bending properties of composites reinforced with 3D woven spacer fabric, experimentally. Spacer fabrics are a type of three-dimensional fabric that has been increasingly used as reinforcement for lightweight sandwich composites in recent years.Īnalyzing the mechanical properties of composites reinforced with 3D fabrics has been the subject of many researchers, ,, ,, ,. 3D fabrics often have a very complex structure that is used to improve the mechanical properties of composites in thickness. Therefore, it is necessary to create a mathematical model for the complex structure of textiles. In fabric-reinforced composites, the geometry of the reinforcement is simplified using the homogenization method due to the complexity of the textile structures. The first and most crucial step in the numerical analysis of structures is to create an accurate model to reduce the prediction error. The maximum Mises and shear stresses are occurred at the midpoint of pile yarns and connection points between piles and layers, respectively. In addition, the results of the numerical and experimental compression test showed that the pile yarns have the main role in the compressional behavior of sandwich structures reinforced with spacer fabrics. The maximum error of 4.04% and 4.2% were recorded in the prediction of geometry and compression modulus of sandwich composites, respectively. The compressional behavior of sandwich composites reinforced with weft-knitted spacer fabrics was simulated using a generated model in the ABAQUS software. In order to simulate the matrix of the sandwich composite, a novel approach was proposed to apply the matrix to the structure of the generated model. A mathematical model was developed for the geometry of 1 × 1-Rib-Gaiting weft-knitted spacer fabric using derived equations. For this purpose, the equations of path yarn were derived. This paper aims to generate a mathematical model for the geometry of weft-knitted spacer fabrics in order to use in the numerical analysis of the mechanical properties of sandwich composites.
The first and most important step in the numerical analysis of the mechanical properties of complex structures is to create an accurate geometrical model.
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