دانلود رایگان مقاله انگلیسی خواص کشسان کامپوزیت های تقویت شده توسط فیبر شبکه ای تصادفی همسانگرد عرضی - الزویر 2019

ABSTRACT

This research stems from the idea of introducing a fibre-network structure into composites aiming to enhance the stiffness and strength of the composites. A novel new type of composites reinforced by a tranversely isotropic fibre-network in which the fibres are devided into continuous segments and randomly distributed has been proposed and found to have improved elastic properties compared to other conventional fibre or particle composites mainly due to the introduction of cross-linkers among the fibres. Combining with the effects of Poisson’s ratio of the constituent materials, the fibre network composite can exhibit extraordinary stiffness. A simplified analytical model has also been proposed for comparison with the numerical results, showing close prediction of the stiffness of the fibre-network composites. Moreover, as a plate structure, the thickness of the fibre network composite is adjustable and can be tailored according to the dimensions and mechanical properties as demanded in industry.

Conclusions

A novel transversely isotropic composites reinforced by a self-connected fibre network has been successfully constructed and simulated to obtain the elastic properties. The simulation results are compared to the analytical results and other relevant experimental and FEA results. It is found that both the in-plane and out-of-plane stiffnesses of the new type of composites are superior to those of other types of transversely isotropic fibre-reinforced composites in which the fibres are not self-connected. It is also found that the combination of the Poisson ratios of the constituent materials could significantly affect the overall elastic modulus and Poisson’s ratio of the composites. The analytical exploration of the simplified model has also shown a good agreement with the numerical results under moderate fibre volume fractions. Another advantage of this new type of composites lies in that the self-connected fibre-network, as a whole single ply, can dramatically minimize the delamination among fibres and thus prevent crack initiation and propagation. As a plate structure, the thickness of the fibre network composite is adjustable and can be tailored according to the dimensions and mechanical behaviours demanded in industry. The new structure can also simplify the manufacturing process while maintaining improved mechanical behaviours especially in the through-thickness direction.