APPLICABILITY OF CREEP CONSTITUTIVE EQUATIONS TO CREEP CURVES UNDER CONSTANT LOAD
APPLICABILITY OF CREEP CONSTITUTIVE EQUATIONS TOCREEP CURVES UNDER CONSTANT LOAD

1.IntroductionRecently,creepconstitutiveequationswhichcandescribeatotalcreepcurvecontainingatertiarycreepstagehavebeendevelopedtodesignhigh--temperaturecomponentsandtopredicttheirlives.Thetypicalmethodsarethe0projectionmethod1--4]andnmethod5--8].Inthe0projectionmethod,acreepcurveisexpressedasasumofadecayingprimarycreepandanacceleratingtertiarycreep.Creepstrain,scisdescribedasacombinationofthetwoexponentialtermsassc==01{1--exp(--02t)} 03{exp(04t)--1},(l)wheretistime,01,02,03and04areparameterc…