Abstract
Flexible rubber joint is an important connecting pipe fitting in ship and chemical industry. However, the problems existing in its application, especially the stress distribution for each component of rubber joint structure, were lack of theoretical analysis. Therefore the finite element model of rubber joint was established according to its structure in this study. With the help of software, the stress characteristics of rubber joint under the axial tension and periodic dynamic load were analysed with the standard maximum internal pressure load and flanges bolt pretension together. The calculation results showed that the order of maximum stress in rubber joint components from big to small was: reinforcement ring, cord layer and rubber skeleton. In order to reduce the stress value at the weak area in the rubber components, the angles of the cord were studied and found that when the cord angle were 60°/-60°for 1,3,5/2,4,6 layer respectively, the maximum stress value for the reinforcement ring and cord fabrics were reduced obviously. After the life computation by the software, it was confirmed that the cord angle arrangement 60°/-60°for cord layers could significantly improve the service life of the rubber joint.
Highlights
Flexible rubber joints, referred to as rubber joints, known as rubber expansion joints, damping throats, etc., are commonly used to absorb displacement and reduce vibration in ship pipeline systems
In order to find the failure cause of rubber joint, the finite element method was used to analyse the stress distribution inside the rubber joint components under the action of internal pressure and the load of x axial tensile displacement or the periodic x axial tensile displacement, and the fatigue life of the rubber joint was calculated by software so as to find the way to improve its service life
The polyester cord material was adopted for the cord layer, and the first to sixth ply cord layers were arranged in the radial direction
Summary
Flexible rubber joints, referred to as rubber joints, known as rubber expansion joints, damping throats, etc., are commonly used to absorb displacement and reduce vibration in ship pipeline systems. The main problems of rubber joints were end leakage and rubber framework degumming and tearing. In order to find the failure cause of rubber joint, the finite element method was used to analyse the stress distribution inside the rubber joint components under the action of internal pressure and the load of x axial tensile displacement or the periodic x axial tensile displacement, and the fatigue life of the rubber joint was calculated by software so as to find the way to improve its service life. The rubber frame’s material was EPDM rubber. The standard flanges were selected for connecting pipelines and fastening rubber joint
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