Theoretical study of a solid composite linerless carbon plastic pipeline for cryogenic fuel components

Abstract

The article presents the results of a theoretical investigation of a fully composite liner-less carbon fiber reinforced polymer pipeline intended for transportation of cryogenic fuel components. A geometric and computational model of the tubular structure was developed with consideration of its structural configuration, material orthotropy, and reinforcement scheme based on filament winding technology. The stress strain state of the pipeline was ana-lyzed using numerical simulation implemented in the Ansys software environment. The distri-butions of radial and axial displacements, as well as normal and shear stresses in the princi-pal material directions, were obtained under the action of internal pressure corresponding to operating conditions.
The article presents the results of theoretical studies of the design of a fully composite linerless carbon fiber pipeline for cryogenic fuel components. A geometric and computational model of the composite pipe structure was built, taking into account its reinforcement scheme. Based on numerical modeling of the stress-strain state in the Ansys program, the distribution of radial and axial displacements, as well as stresses in the direction of the fibers of the pow-er shell under the action of internal pressure, was determined. The results obtained indicate the orthotropic nature of the deformation of the structure and the significant influence of the fiber orientation on the level of stresses in the material. It is shown that the use of layered models allows us to adequately describe the mechanical behavior of the carbon fiber pipe un-der operational load conditions. The results of the study can be used to refine engineering methods for calculating composite pipelines and justify design parameters when designing cryogenic fuel supply systems.
The simulation results demonstrate a pronounced orthotropic deformation behavior of the composite structure caused by the directional properties of the reinforcing fibers. A sig-nificant influence of the fiber orientation and stacking sequence on the magnitude and local-ization of stresses within the pipe wall was identified. It was established that certain rein-forcement angles lead to an increase in circumferential stresses, while others contribute to a more uniform stress distribution, which is essential for improving structural integrity under combined mechanical and thermal loading.
The study confirms that layered composite models provide an adequate representation of the mechanical response of carbon fiber pipelines subjected to operational loads and can be effectively applied for predicting critical stress zones. The obtained results contribute to a deeper understanding of the deformation mechanisms of linerless composite pipelines operat-ing at low temperatures and under internal pressure. The proposed modeling approach can be used to refine engineering calculation methods and to substantiate rational design pa-rameters when developing cryogenic fuel supply systems for aerospace and energy applica-tions.