Establishment of Creep Model of Non-asbestos Sealing Composite Material by Beater-addition Process and the Creep Performance Research

摘要

Creep resistance is one of the important properties of the sealing material, which is the main factor affecting the life of the gasket. There are many factors influencing on the creep properties due to the fact that non-asbestos gasket materials are a kind of composite material of multiple components. The theoretical research, experimental study, and the establishment of mathematical model of the creep are the popular field. In this paper, based on non-asbestos gasket materials, the creep constitutive equation of non-asbestos gasket materials at constant temperature under constant load condition was established, and the creep properties was tested and fitted, through the combination of three parts: the Maxwell model in series connection with two V-K models in parallel, It is shown from the results that the creep model can be used to reflect the creep characteristics of the material. The obtained creep curve shows that the creep of the gasket mainly occurs in the initial 10 h. With the increase of stress, the initial deformation of the gasket increases, and the deformation of the gasket increase with the increase of time. At the same time, the creep variable fitting shows a relatively well log curve characteristic, so the creep data can be fitted by the log curve.