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Limited by the fabrication process, the samples of 3D auxetic composites used for experimental tests by Jiang and Zhou were very restricted. proved that the auxetic effect was not diminished in their 3D composite. By using ABS tubes to replace the warp yarns and eliminating the stitch yarns, Jiang et al. In addition, its low-velocity impact properties were recently investigated as well. Meanwhile, a simplified equation and a 2D FE model were also developed to theoretically predict its negative PR behavior. By embedding this auxetic structure into zero PR polyurethane (PU) foam, the 3D auxetic composite was fabricated and its compression auxetic behavior was studied by Zhou et al. Both of curved and straight weft yarns were considered as the initial configuration. Using a 3D unit cell, the auxetic behavior of the structure was experimentally verified, theoretically analyzed, and numerically studied. proposed a novel 3D auxetic textile structure for composite reinforcement based on the modification of a 3D conventional orthogonal woven structure. ĭifferent from the discrete inclusions of auxetic reinforcements, Ge et al. This work successfully sketched auxetic structures and microsystems. They proposed a design approach that was applied to elements composed by microstructured material with prescribed properties. theoretically investigated the synthesis of auxetic structures by a topology optimization approach for micropolar materials. found that the mechanical properties and deformation behavior of auxetic composites can be tailored by controlling the geometry features and the density of inclusions, and these findings were confirmed by Wang et al. Yet, plenty of reinforcements have been proposed or developed to fabricate auxetic composites, such as specific two-dimensional (2D) triangle inclusions, three-dimensional (3D) tetrahedron hollow shell, cellular honeycomb structure, double arrowhead, and chiral network. But, the inclusion shape is not restricted to sphere.
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They found that the indentation resistance of the composite could be improved by enhancing the modulus of elastic matrix.
HOW TO FIND SOLID 92 IN ANSYS 15 WINDOWS
With regard to the second approach, Wei and Edwards, firstly, theoretically predicted existence of auxeticity windows for composite by randomly dispersed auxetic spheres into a non-auxetic matrix and verified by experiment. found that the low velocity impact resistance of auxetic carbon fiber laminates is better than that of laminates with near zero and positive PR. Milton theoretically proposed an auxetic composite that was generated by layering component materials in different directions on widely separated length scales and found that negative PR of composites could reach −1.
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With regard to the first approach, the composites fabricated with non-auxetic materials by using specially designed configurations are laminates. The first one is using specially designed configurations with non-auxetic constituent materials (reinforcement and matrix) and the other is to include auxetic elements in a composite or use auxetic constituents, for example, auxetic matrix, auxetic reinforcement, or both. , two approaches could be adopted for the fabrication of auxetic composites. In addition to the properties of composite, auxetic composites also take the advantages of auxetic materials, such as enhanced indentation resistance, improved durability of fatigue, and improved energy absorption capability. The study has provided us a guidance to design and fabricate auxetic composites with the required mechanical behavior by appropriately selecting structural parameters and constituent materials.Īuxetic composites are a special type of materials with negative Poisson’s ratio (PR), which expand when stretched and vice versa. The analysis results showed that the auxetic and non-auxetic composites have different compression behaviors and the auxetic composite has better the energy absorption capacity than the non-auxetic composite under the same compression stress. For the comparison, 3D non-auxetic composite that was made with the same constituent materials and structural parameters, but with different yarn arrangement in the textile structure was also analyzed at the same time. Then, the validated model was used to evaluate effects of structural parameters and constituent material properties. The two-dimensional (2D) FE model was first developed and validated by experiment.
HOW TO FIND SOLID 92 IN ANSYS 15 SOFTWARE
This paper reports a finite element (FE) analysis of three-dimensional (3D) auxetic textile composite by using commercial software ANSYS 15 under compression.