Prediction Of Mechanical Properties For Laminated Nanocomposites Based On Homogenization

Composite laminated plate, because of its high specific strength, light weight, strongcorrosion resistance, and a series of advantages, has been vigorously developed andapplied in the wind blade. But as the development of large-scale and light quality windpower generation technology, it has put forward higher requirements on the strength andstiffness of wind turbine blade composites. If carbon nanotubes and nanofilms withexcellent performance be used to enhance wind turbine blade composites, it is expected toobtain expected result. In this paper, using homogenization theory and finite elementmethod, the equivalent mechanical properties for wind turbine blade composite laminatedplates enhanced by carbon nanotubes and nanofilms are predicted.The prediction model of mechanical properties for the wind turbine blade laminatedcomposites is established. Combined homogenization theory with finite element method,the influence law of the fibre material parameters (volume fraction, the elastic modulus,Poisson’s ratio etc.) on the equivalent properties of wind turbine blade laminatedcomposites is predicted. And the formula of the equivalent elastic modulus for laminatedcomposites is derived by with the coordinate transformation. The program is written andthe equivalent elastic moduli for laminated composites are computed. According to theprinciple of mathematical optimization, the design of the orientations for laminatedcomposites is optimized.The multi-scale model of the equivalent mechanical properties for the wind turbineblade laminated composites is established. The structure of the wind turbine bladelaminated composites reinforced by carbon nanotubes is described with macroscopic andmesoscopic and nanoscopic scale, respectively. Through three scale homogenizations, theequivalent elastic properties of the macroscopic wind turbine blade laminated compositesreinforced by carbon nanotubes are predicted. Without considering the interface betweencarbon nanotube and matrix, and the bonding between fiber and matrix, the influence lawof the carbon nanotube material parameters (volume fraction, the elastic modulus,Poisson’s ratio, length-diameter ratio etc.) on the equivalent properties of wind turbineblade laminated composites is predicted. With considering the interface between carbonnanotube and matrix, and the bonding between fiber and matrix, the influence law of theinterface parameters (volume fraction, the elastic modulus, Poisson’s ratio, the ratio oflength to thickness etc.) on the equivalent properties of wind turbine blade laminated composites is predicted.The multi-scale model of the equivalent mechanical properties for the wind turbineblade laminated composites is established. The influence rules of the material parametersof nanofilms (volume fraction, the elastic modulus, Poisson’s ratio etc.) and the propertyparameters of matrix (the elastic modulus, Poisson’s ratio etc.) on the equivalent propertiesof wind turbine blade laminated composites reinforced by nanofilms are predicted.This paper provides certain guidance for the preparation of large wind turbine blades.