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

作　　者：郭育豪 刘刚[1,2] 宋育泽[1] GUO Yuhao;LIU Gang;SONG Yuze(School of Naval Architecture,Faculty of Vehicle Engineering and Mechanics,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024 [2]大连理工大学工业装备结构分析优化与CAE软件全国重点实验室,辽宁大连116024

出　　处：《哈尔滨工程大学学报》2024年第4期642-650,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51879038).

摘　　要：为了解决工程上在评估深潜器耐压壳体安全可靠性时不考虑拉压蠕变破坏机理产生的差异,会导致较大计算误差问题,本文提出了适用于室温蠕变的蠕变损伤本构模型。通过分析钛合金材料蠕变特性,考虑了室温环境下位错堆积造成的蠕变阻力,并且位错堆积的现象与时间有关。基于微分自洽法提出了适用于室温环境下的钛合金蠕变本构模型,得到受压情况下TC4ELI的相关材料参数,并将该模型用USDFLD和CREEP子程序进行定义。研究表明:对于受压结构而言,使用通过拉伸蠕变实验得到的本构模型的计算结果会过于保守,对于含V型缺口平板受压时等效蠕变应变的相对误差为168.20%。本文所提出的模型适用于环肋耐压壳结构的蠕变损伤分析。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 

分 类 号：O346.5[理学—固体力学]