Abstract:Creep relaxation occurs when the gaskets of bolted flange joints are used for a long time.Creep relaxation of the gasket can cause fluid leakage inside the joint.To prevent leakage of sealing fluid from flange joints,it is important to establish a method to predict gasket creep and stress relaxation.A three-parameter Kelvin fluid model was used to establish an analytical model for predicting the residual stress of gaskets at high temperature creep with time,and the creep relaxation experiments of the latex composite gasket at different temperatures and different stress loads were carried out.The results indicate that under the same stress load,the higher the temperature of the latex composite gasket,the more obvious the residual stress decreases,the greater the stress load,the more stress is lost,and the residual stress decreases gradually over time.The high temperature creep relaxation behavior of the gasket can lead to the decrease of the mass and thickness of the gasket.But as the gasket stress load continues to increase,the decreased trend of mass and thickness of the gasket at the stress load will be slowed down.However,with the increase of temperature,the mass and thickness of the gasket continue to decrease,and the downward trend will not slow down.The predicted value of the three-parameter Kelvin fluid model is very close to the experimental data,and the maximum error is 4104%.The model can accurately describe the mechanical behavior of the gasket and the stress load loss caused by the creep relaxation.
