Finite Element Analysis Of Flexible Rubber Joint On Structural Parts

Flexible rubber joints(referred to as rubber joints)as an important connector in the pipeline system,due to its complex loading conditions,it is necessary for extending the service life to carry out numerical analysis on the stress status of the rubber joints to find the location of lower stress.This article takes the research of pipelines for ships as the background and mainly completes the following research contents:First,by setting different cell densities,the accuracy of the results of the finite element analysis was verified;the material parameters,unit types,interactions,and boundary loads of each component were determined,and the three-dimensional solid modeling of the flexible rubber joint was completed.Second,according to the load characteristics of the rubber joints,the allowable displacement values of the rubber joints,axial tension,pressure,radial movement and stress analysis under the displacement angle are performed.Among them,the radial movement and the stress of each component under the deflection angle Large,there are stress concentration and abrupt changes in the rubber skeleton and cord layer at the transition;then the dynamic response of the rubber skeleton and bolt load under the excitation force of the rubber joint is selected by implicit dynamic analysis.The rubber joint is in the axial direction and the diameter when the vibration occurs,the stress fluctuation amplitude increases with the increase of the stress value;the modal analysis of the rubber joint is selected by using the Lanczos method,in which the radial formation generally repeats twice,and the axial formation is not repeated due to the constraint condition.Bolt load and internal pressure can significantly increase the natural frequency of rubber joints.Finally,the order of stress for each component:reinforcement rings,cord layers,and rubber skeletons.By comparing the stress results of the two adjustment cord angles,it was determined that when the cord angle is adjusted to-/+ 60° as a whole,the stress of the cord layer and the reinforcing ring can be reduced.The FE-Safe fatigue life calculation results show that the rubber joints do not suffer fatigue failure under excitation force and axial tension and pressure,and the rubber joints undergo fatigue failure at the radial displacement and deflection angles,and the life is lowest at the deflection angle,and the curtain Adjusting the line angle to-/+60° can significantly increase the fatigue life.