Compressive-Compressive Fatigue Characteristics of GFRP 45 Pipes at the Cryogenic Temperature (Life Prediction with Energy Dissipation based on the Viscoelastic-plastic Model)

摘要

Characteristics of fatigue behavior in GFRP pipes under cycliccompressive loading was inves- tigated at both room and cryogenictemperature. Experimental work was carried out to clarify an effectof the temperature rise of the specimen on the dynamic mechanicalproperties for both environmental conditions. It was found thatsurface temperature of the specimen rose in the room temperaturetests and that the variation of the temperature was dependent on thefrequency of the fatigue test. Although, there was not a large changeis temperature at 77 K. Variation in the stiffness and the energydissipation caused by the static friction were investigatedexperimentally. And a viscoelastic-plastic model based on theDamorheology was also used to describe the hysteresis loops andseparate the energy dissipation into the each of static frictionalelement and viscous element. The variation of the static frictionalelement with cyclic loading was a good agreement with theexperimental data.