The Study Of Laying Parameters’ Influences On The Performance Of Carbon Fiber Marine Propller

The traditional metal propeller is mostly made of NAB.This kind of materialhas high weight, large vibration and big noise, which lead to many disadvantages ofthe marine propeller. As nations develop, the society requires more and more high tothe propeller’s performance, especially to the military propeller. Because of itsexcellent static and dynamic characteristics such as high specific strength andstiffness, high natural frequency and damping, carbon fiber reinforced plastic(CFRP)has become the new favorite marine propeller material. Thanks for its excellentperformance, the marine propeller made of CFRP not only can considerably reduceweight, but also have many advantages such as high strength, corrosion-resistant,shock resistance, easy maintenance, good sound damping performance and lowvibration. This paper focuses on design and evaluation of CFRP marine propeller, anddiscuss the optimal design of layer parameters.In this paper, composite materials classical mechanics theory is used to concludethat laying parameters has a significant impact on the mechanical properties, bendingand torsion coupling effect of the carbon fiber marine propellers. So that the layingparameters could be designed to optimize the carbon fiber marine propeller’sperformance. Based on beam element theory, the expression of the carbon fibermarine propeller’s bending-torsion coupling control coefficient is deduced, andanalyzing the various factors that affect the control coefficient.Based on the offset table of one metal marine propeller, the model of carbonfiber marine propeller is given. The CFD software Fluent is used to build the stressanalysis model in design situation and calculate the load of the marine propeller inpractical work. Next, the load is imported to Ansys, which is as the compressive loadof the blade. The ANSYS finite element simulation is used to get the maximumdeformation and the max Tsai-Wu Invalid index of the blade in different layingparameters, and discuss the laying parameter’s influence to strength of the marinepropeller. Next, the ANSYS finite element simulation is also used to get the first threeorder natural frequency and the corresponding vibration mode of the blade indifferent laying parameters, and discuss the laying parameter’s influence to dynamics performance of the marine propeller.The analysis shows that the different layer angle have the greatest influence onthe performance of carbon fiber marine propellers. With the increasing laying angle,carbon fiber marine propellers’ strength performance has a significant improvement.However, the natural frequency increases first and then decreases, obtains the maximumvalue in the vicinity of45°, and the performance changes great when the layer angle is±45°.So the layer angle of±45°should be increased in practical work. The change of the layerthickness has no influence on strength and dynamics performance of the marine propeller.However, the change of the layer thickness ratio will have some influence on the performance ofthe marine propeller. The marine propeller’s performance achieve best when the number ofoptimal layer angle is less than4layers. Using symmetric carbon fiber marine propeller has abetter performance than the unsymmetric one when its other parameters are the same. In addition,the carbon fiber marine propeller’s performance will be better when its surface layer angle is90°,the fiber layer of±45°is put near the middle layer and the fiber layer of the large angle is putfar from the middle layer.