Creep damage constitutive model of titanium alloys under compression at room temperature
In creep damage mechanisms,differences in compression and tension are often ignored when evaluating the safety and reliability of submersible pressure shells.This oversight may lead to large errors.The creep proper-ties of titanium alloy materials are analyzed,and the creep resistance caused by dislocation accumulation at room temperature is considered.In addition,dislocation accumulation is time dependent.A creep constitutive model of titanium alloy applicable to a room temperature environment is proposed on the basis of the differential self-adjoint method.Thereby,the material parameters of titanium alloy under compression conditions are obtained,and the model is defined using USDFLD and CREEP subroutine.The results show that for the compression structure,using the constitutive model obtained through the tensile creep experiment leads to a conservative outcome.The relative error of the equivalent creep strain is 168.20%for a plate with V-notch.The proposed model is applicable to the creep damage analysis of ring-ribbed pressure shell structures.
titanium alloyroom temperature creepcreep damageconstitutive modeldifference in tension and compressioncontinuous damage mechanicsfinite element methodpressure shell
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NSTL
万方数据
维普
