钛合金耐压结构蠕变数值计算方法与试验验证
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摘要
通过对比分析多种典型蠕变本构模型,考虑应力水平、本构模型、蠕变时间等三个因素的影响,确定了TC4ELI材料钛合金常温压缩蠕变本构方程及其系数,初步建立了钛合金耐压结构蠕变数值计算方法。对钛合金环肋圆柱壳模型开展蠕变数值计算,给出蠕变前后模型的应力、应变和位移的变化情况。结果表明:修正的时间强化模型可以表征钛合金耐压结构初始蠕变阶段和稳态阶段的蠕变特性,能够适用于深海钛合金耐压结构的蠕变计算;产生蠕变变形后钛合金耐压结构应力重新分配,高应力区范围有所扩大,蠕变后弹性应变和总应变均减小;相比于纵向,蠕变对环肋圆柱壳结构的径向变形影响更大。
The creep constitutive equation and parameters for TC4 ELI alloys at ambient temperature are confirmed by analyzing typical creep constitutive models comparatively, and creep numerical calculation methods for pressure structures of titanium alloy are established considering the effect of stresses, constitutive models and creep time. Creep numerical calculations of ring-stiffened cylindrical shell of titanium alloy are developed, and variations of stress, strain and deformation by reason of creep are presented. The results show that modified time hardening model could characterize the creep behavior of pressure structures made of titanium alloys in the stage of primary creep and steady-state creep, applicable to the creep calculation of pressure structures made of titanium alloys in deep sea. Redistribution of stress occurs after creep deformations develop in pressure structures made of titanium alloys, and the scope of region for high stress is enlarged, while there has been a decrease in elastic strain and total strain. Compared with the longitudinal direction, the creep has a greater influence on radial deformation of the ring-stiffened cylindrical shell.
The creep constitutive equation and parameters for TC4 ELI alloys at ambient temperature are confirmed by analyzing typical creep constitutive models comparatively, and creep numerical calculation methods for pressure structures of titanium alloy are established considering the effect of stresses, constitutive models and creep time. Creep numerical calculations of ring-stiffened cylindrical shell of titanium alloy are developed, and variations of stress, strain and deformation by reason of creep are presented. The results show that modified time hardening model could characterize the creep behavior of pressure structures made of titanium alloys in the stage of primary creep and steady-state creep, applicable to the creep calculation of pressure structures made of titanium alloys in deep sea. Redistribution of stress occurs after creep deformations develop in pressure structures made of titanium alloys, and the scope of region for high stress is enlarged, while there has been a decrease in elastic strain and total strain. Compared with the longitudinal direction, the creep has a greater influence on radial deformation of the ring-stiffened cylindrical shell.
引文
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[8]王雷,屈平,李艳青,等.钛合金材料蠕变特性的理论与试验研究[J].船舶力学,2016,22(4):464-474.Wang Lei,Qu Ping,Li Yanqing,et al.Theoretical and experimental investigations for creep properties of titanium alloy materials[J].Journal of Ship Mechanics,2016,22(4):464-474.
[9]Savage M F,Neeraj T,Mills M J.Observations of room temperature creep recovery in titanium alloys[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2002,33(3):891-898.
[10]Boyle J T,Spence J.Stress analysis for creep[M].Butterworths,UK,1983.
[2]Whittaker M T,Harrison W J,Lancaster R J.An analysis of modern creep lifing methodologies in the titanium alloy Ti6-4[J].Materials Science and Engineering A,2013,A577:114-119.
[3]Drefahl K,Wincierz P,Zwicker U,et.al.230000 h creep properties of titanium produced from electrolotic and sponge material and TiAI6V4 alloy at 20℃[C]//Proceedings of the Fifth International Conference on Titanium.Munich,Germany,1984.
[4]蔡志勤,周勇,姜立学,等.涡轮叶片蠕变全过程的修正Graham模型的参数识别[J].应用力学学报,2010,27(4):768-773.Cai Zhiqin,Zhou Yong,Jiang Lixue,et al.Parameter identification of modified Graham model for overall process of creep in turbine blades[J].Chinese Journal of Applied Mechanics,2010,27(4):768-773.
[5]Ankem S,Wilt T.A literature review of low temperature(<0.25 Tmp)creep behavior ofα,α-β,andβtitanium alloys[R].Center for Nuclear Waste Regulatory Analyses,San Antonio,Texas,2006.
[6]刘学,徐鸿,郑善合,等.修正Graham模型描述蠕变全过程的探讨[J].现代电力,2006,23(1):57-60.Liu Xue,Xu Hong,Zheng Shanhe,et al.Discussion of modified Graham model for overall process of creep[J].Modern Electric Power,2006,23(1):57-60.
[7]苗克军,王建梅,蔡敏,等.油膜轴承衬套巴氏合金蠕变有限元分析[J].太原科技大学学报,2015,36(5):380-384.Miao Kejun,Wang Jianmei,Cai Min,et al.Finite element analysis of Bibbitt alloy of oil-film bearing bushing[J].Journal of Taiyuan University of Science and Technology,2015,36(5):380-384.
[8]王雷,屈平,李艳青,等.钛合金材料蠕变特性的理论与试验研究[J].船舶力学,2016,22(4):464-474.Wang Lei,Qu Ping,Li Yanqing,et al.Theoretical and experimental investigations for creep properties of titanium alloy materials[J].Journal of Ship Mechanics,2016,22(4):464-474.
[9]Savage M F,Neeraj T,Mills M J.Observations of room temperature creep recovery in titanium alloys[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2002,33(3):891-898.
[10]Boyle J T,Spence J.Stress analysis for creep[M].Butterworths,UK,1983.