深潜器多球交接耐压壳室温蠕变-疲劳特性研究  

Study on Cold Creep-Fatigue Characteristics of Pressure-resistant Shells with Multi-sphere Junction for Deep-sea Submersibles

作　　者：焦天震 刘刚 郭育豪[1] 李盈盈 胡旭 张昊 JIAO Tianzhen;LIU Gang;GUO Yuhao;LI Yingying;HU Xu;ZHANG Hao(School of Naval Architecture,Faculty of Vehicle Engineering and Mechanics,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian 116024,China;Department of Frontier and Innovation Research,Wuhan Second Ship Design and Research Institute,Wuhan 430064,China)

机构地区：[1]大连理工大学运载工程与力学学部船舶工程学院,大连116024 [2]工业装备结构分析国家重点实验室,大连116024 [3]武汉第二船舶设计研究所前沿创新与基础研究部,武汉430064

出　　处：《中国造船》2023年第3期157-168,共12页Shipbuilding of China

基　　金：国家自然科学基金面上项目(51879038);国防科技创新特区重点项目(19-H863-05-ZD-007-001-04)。

摘　　要：为了揭示钛合金深潜器多球交接耐压壳在实际作业过程中的蠕变-疲劳特性,通过定义的比例因子建立考虑蠕变损伤演化速率拉压不对称时的室温蠕变-疲劳损伤模型,通过对ABAQUS软件进行二次开发,基于蠕变-疲劳损伤模型和自动周期跳跃算法,建立了适用于深潜器多球交接耐压壳结构的蠕变-疲劳损伤数值模拟方法。数值分析结果显示,多球交接耐压壳结构的热点位置在承受拉伸载荷时,蠕变损伤对结构的蠕变-疲劳寿命影响显著,而承受压缩载荷时几乎不产生蠕变损伤;当作业水深增加时,蠕变-疲劳裂纹萌生寿命的减少速度明显高于疲劳裂纹萌生寿命的减少速度;当处于相同水深时,保载时间增加会使结构的蠕变-疲劳裂纹萌生寿命减少,但耐压壳的实际可作业时间大幅提升。研究结果可为多球交接耐压壳蠕变-疲劳强度的计算提供参考。In order to reveal the creep-fatigue characteristics of the multi-sphere pressure shell of titanium alloy deep-sea submersible in actual operation,a creep-fatigue damage model at room temperature considering the tension/compression asymmetry of the creep damage evolution rate is established by constructing a scale factor.Secondary development of ABAQUS,which is based on the creep-fatigue damage model and automatic cycle jump algorithm,is carried out to establish the numerical simulation method of creep-fatigue damage.The numerical results show that the creep damage affects the creep-fatigue life significantly when the hot point of the pressure shell subjected to tensile load.There is almost no creep damage when the hot point subjected to compressive load.When the working depth increases,reduction rate of creep-fatigue crack initiation life is significantly higher than that of the fatigue crack initiation life.When the load hold time increases,the creep-fatigue crack initiation life of the pressure shell decreases,but the actual working time is greatly improved.The research results provide a reference for calculating creep-fatigue strength of multi-sphere pressure shell.

关 键 词：蠕变-疲劳 深潜器 数值模拟 钛合金 多球交接耐压壳 拉压不对称 

分 类 号：U661.4[交通运输工程—船舶及航道工程]