Multi-parametric Analysis on Buckling of Nano-Reinforced Prepreg Wound Riser Considering Void Shape and Distribution

Buckling resistance of composite riser always demonstrates diverse sensitivity to the fiber, matrix, and defects. The purpose of this paper is to analyze the parametric effect on the buckling load of prepreg wound riser under combined loads considering the process-induced voids. The analytical model of composite riser with void defect is established firstly based on the Flügge model and Galerkin method. The accuracy of the proposed model is verified with previous experimental research in mechanical behavior of composite cylinder. Then, there are five relevant input parameters that are selected such as volume content of carbon nanotubes and void, void shape and distribution, metal liner. Further, based on the proposed model, the multi-parametric analysis on buckling behavior of composite riser is investigated considering process-induced voids. The results imply that the void volume content has a stronger impact on the buckling resistance than carbon nanotubes. Besides, the increment of buckling load of composite riser presents different trends as the void shape evolves from flat ellipse to vertical ellipse. By correlating the prepreg winding process parameters, this study can provide guidance for process designers in exploiting optimal winding parameters for high buckling resistance to weight ratios.