INFLUENCE OF TYPE OF LOADING ON DEFORMATION CHARACTERISTICS OF FLUOROPLASTIC-4 GASKETS

摘要

An assessment has been made of the intensity of axial deformation of test fluoroplastic-4 (polytetrafluoroethylene) specimens upon their loading (compression) and unloading (recovery) in the 20-200℃ temperature range. It has been proved that the nature of loading (compression or recovery) exerts significant influence on the intensity of deformation (instantaneous modulus) of the fluomplastic element. For assessing the influence of the type of load, conditional calculating compression and recovery moduli have been proposed and calculating expressions for their assessment have been obtained. Also, calculating expressions for determining residual deformation of the fluoroplastic-4 specimen under static and cyclic loads have been derived.