Free vibration analysis of a spinning porous nanocomposite blade reinforced with graphene nanoplatelets

This paper investigated the modeling and free vibration characteristics of a spinning graphene nanoplatelet (GPL) reinforced porous nanocomposite blade. The blade is made of porous foam metal matrix reinforced with graphene nanoplatelets (GPLs). Several different GPL distributions and porosity distributions in the blade are taken into account. The effective material properties of the blade, determined via the open-cell scheme, the Halpin-Tsai model, and the rule of mixture, are assumed to be varying continuously along the its thickness direction. According to the Kirchhoff's plate theory, the governing equations of the spinning blade are derived by adopting the Hamilton principle. On the other hand, the non-uniform spinning blade is modeled by the finite element method which is compared with the theoretical method. The theoretical results match very well with the finite element ones obtained from ANSYS. Particular focus is given to the effects of the spinning speed, porosity coefficient, distribution pattern of GPLs and porosities, GPL weight fraction, length-to-thickness ratio and length-to-width ratio of GPLs, blade length, and spinning radius on the free vibration performance of the blade rotor.

Automated summary

This study investigated the modeling and free vibration characteristics of a spinning graphene nanoplatelet reinforced porous nanocomposite blade, considering various distributions of GPL and porosity. The effective material properties were determined using different models and assumed to vary continuously along the thickness direction. The theoretical and finite element methods were compared, showing good agreement, with a focus on the effects of various parameters on the blade rotor's free vibration performance.