深潜器钛合金室温蠕变-疲劳损伤模型及数值研究  

Study on room temperature creep-fatigue damage model and numerical method of titanium alloys of deep submersibles

作　　者：焦天震 郭育豪 刘刚[1,2] 李盈盈 黄一[1,2] JIAO Tianzhen;GUO Yuhao;LIU Gang;LI Yingying;HUANG Yi(School of Naval Architecture,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Structural Analysis 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国家重点实验室,辽宁大连116024

出　　处：《哈尔滨工程大学学报》2024年第10期1857-1864,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51879038).

摘　　要：针对钛合金深潜器耐压壳在实际作业过程中疲劳与蠕变损伤相互促进的现象,本文提出了适用于室温环境下钛合金材料的蠕变-疲劳损伤模型和数值模拟方法。基于连续损伤力学理论建立了蠕变-疲劳损伤模型,并通过单轴蠕变-疲劳试验标定了参数;将该模型用子程序进行定义,通过有限元软件二次开发模拟了紧凑拉伸试件蠕变-疲劳损伤演化过程,并将数值模拟结果与试验结果对比。试验结果表明:超过90%的数据点预测结果的相对误差包络在±50%范围内,紧凑拉伸试件蠕变-疲劳寿命的模型预测结果与试验值误差为2.9%。本文所提出的模型和数值模拟方法可以很好地描述钛合金结构的室温蠕变-疲劳失效过程。To propose a creep-fatigue damage model and numerical simulation method applicable to titanium alloy material under room temperature environment for the phenomenon that fatigue and creep damage promote each other during the actual operation of titanium alloy deep submersible pressure-resistant shell.Firstly,a creep-fatigue damage model was established based on the theory of continuous damage mechanics,and the parameters were calibrated by uniaxial creep-fatigue test;The model is then defined as a subroutine,and the creep-fatigue damage evolution process of CT specimen is simulated through ABAQUS secondary development,and the numerical simulation results are compared with the test results.More than 90%of the relative errors between the damage values predicted by the model and the experimental results in this paper are enveloped within±50%,and the error between the model prediction and the experimental values for the creep-fatigue life of CT specimens was 2.9%.The proposed method and numerical simulation method can effectively describe the room temperature creep-fatigue failure process of titanium alloy structures.

关 键 词：蠕变-疲劳 钛合金 深潜器 连续损伤力学 有限元法 子程序 裂纹萌生 裂纹扩展 

分 类 号：U661.4[交通运输工程—船舶及航道工程]