哈尔滨工程大学学报2024，Vol.45Issue(4)：642-650,9.DOI:10.11990/jheu.202111047
钛合金室温受压蠕变损伤本构模型
Creep damage constitutive model of titanium alloys under compression at room temperature
摘要
Abstract
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.关键词
钛合金/室温蠕变/蠕变损伤/本构模型/拉压不同/连续损伤力学/有限元法/耐压壳Key words
titanium alloy/room temperature creep/creep damage/constitutive model/difference in tension and compression/continuous damage mechanics/finite element method/pressure shell分类
数理科学引用本文复制引用
郭育豪,刘刚,宋育泽..钛合金室温受压蠕变损伤本构模型[J].哈尔滨工程大学学报,2024,45(4):642-650,9.基金项目
国家自然科学基金项目(51879038). （51879038）
