The Numerical Simulation Of Unidirectional Fiber-reinforced Composite

More and more attention from aerospace,automotive,military,marine and sports equipment industry has being paid to fiber-reinforced composites, for which have a series of advantages. However, their properties are often complex and difficult to determine for their multiphase. The factors affecting their properties and how are still not very clear. Nevertheless, problems can be solved by experimental and analytical methods are limited. Besides the results are not satisfactory, experimental and analytical methods are also high cost and time-consuming. With the development of computer technology and the gradual improvement of numerical methods theory, more and more researchers turn to numerical simulation to study the fiber-reinforced composite materials, and some satisfactory results are also achieved.The disadvantages, such as high cost,time-consuming, are avoided with numerical simulation method to study the fiber-reinforced composites. At the same time, it escapes from the limitation that problems can be solved with analytical method are limited. Therefore, more and more attention and recognition have been paid to numerical simulation in the research of fiber-reinforced composites. The pull-out process of fiber bundle in unidirectional fiber-reinforced composites is simulated with numerical simulation method. Subsequently, composite cooling from the temperature after curing to room temperature is also investigated by numerical simulation. The effect of fiber volume fraction on thermal residual stress distribution,the effect of matrix modified with inorganic rigid nano-particles on the bonding strength between fiber and matrix and the distribution of thermal residual stress,the effect of matrix modified with different inorganic rigid nano-particles on the bonding strength between fiber and matrix and the distribution of thermal residual stress are included.The curve of load applied on the fiber versus the displacement of the fiber along the longitude direction is obtained with numerical simulation. With the simulation of the effect of fiber volume fraction on the distribution of residual thermal stresses, the distribution of the residual thermal stresses in different models are obtained. The bonding strength is enhanced with the matrix modified by inorganic rigid nano-particles. Moreover, the bonding strength is improved with the Young's modulus of the nana-particles increased. The conclusion that the debonding occurred at the end of the materials in the longitude direction of the fiber can be drawn from different models. Debonding is caused by the shear stress in the interface between fiber and matrix. These conclusions are useful for improving the strength of materials, and also expand the application of fiber-reinforced composites.