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Sales tax will be calculated at check-out. Free Global Shipping. Description Reinforcements are an integral part of all composites and the quality and performance of the composite can be optimised by modelling the type and structure of the reinforcement before moulding. Composite reinforcements for optimum performance reviews the materials, properties and modelling techniques used in composite production and highlights their uses in optimising performance. Part one covers materials for reinforcements in composites, including chapters on fibres, carbon nanotubes and ceramics as reinforcement materials.
In part two, different types of structures for reinforcements are discussed, with chapters covering woven and braided reinforcements, three-dimensional fibre structures and two methods of modelling the geometry of textile reinforcements: WiseTex and TexGen. There is a difference of the width and thickness of the ellipse in outer and central layers as shown in Fig.
The major axis of a fiber bundle in outer layer is larger than that of central layer. On the other hand, the minor axis in outer layer tends to be smaller than that of central layer. Figure 4 shows the observational results of width and thickness of a bundle. We consider that this deference can not be ignored to estimate the mechanical behaviors of woven FRP. Figure 5 shows a cross section of the fiber bundle by SEM.
From the image data of a cross section of fiber bundles in Fig. In case of a woven FRP, volume fraction is distributed in a fiber bundle. The center part in it has the highest volume fraction and edge parts have lower value. The tendency is same as the results of previous paper. The procedure is as follows. Firstly, the structural model of internal geometry of the fabrics is generated by WiseTex software.
Finally, we can get the laminated FE models by FE analysis of compressive deformation as shown in Fig. One is a model A which means the real- scale structure for test specimen in Fig. As the comparison, a model B , which the topology of fiber bundles at every layer is same with outer layer of model A , was created.
Furthermore, a model C was also prepared, which layer is same with central layer in model A. The mechanical properties at each divided part of a bundle in Fig. A fiber bundle is treated as uni-directional fiber reinforced composites, and the mechanical properties can be calculated by the rule of mixture based on the obtained volume fractions. Figure 8 shows the FE mesh for laminated woven composites with boundary condition.
Figures 9 and 10 show the numerical results of damage development for each model, and the stress-strain diagram is shown in Fig. However, the location of damage and the propagation is quite different due to the effect of nesting.
Numerical results of initial damage are also shown in Fig. To make clear the damage in the strand, the only strand parts are also indicated.
And, no cracks occur at the edge part in Fig. Furthermore, there are no damages in central layer in model A. This tendency is almost same with the numerical results of model B in Fig. In case of model A and B , the damages develop in central parts of weft bundles in central layer.
Furthermore, in case of model C , the initial damage appears and develops in each layer.
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