TC4ELI钛合金疲劳裂纹路径偏折与寿命提升机制

doi:10.3901/JME.2023.16.072

机械工程学报 ›› 2023, Vol. 59 ›› Issue (16): 72-81.doi: 10.3901/JME.2023.16.072

• 特邀专栏:机械结构强度设计与完整性评估 • 上一篇下一篇

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TC4ELI钛合金疲劳裂纹路径偏折与寿命提升机制

于培师^1,2,3, 赵宇翔^1,2,3, 吴连生^1,2,3, 卞家坤^1,2,3, 赵军华^1,2,3, 郭万林⁴

1. 江南大学江苏省食品先进制造装备技术重点实验室无锡 214122;
2. 江苏省微纳增减材制造工程研究中心无锡 214122;
3. 江南大学机械工程学院无锡 214122;
4. 南京航空航天大学机械结构力学及控制国家重点实验室南京 210016

收稿日期:2022-12-06 修回日期:2023-03-16 出版日期:2023-08-20 发布日期:2023-11-15
通讯作者: 赵军华(通信作者),男,1979年出生,博士,教授,博士研究生导师。主要研究方向为宏微纳结构力学性能的跨尺度理论、试验及数值模拟。E-mail:junhua.zhao@163.com
作者简介:于培师,男,1982年出生,博士,副教授。主要研究方向为疲劳与断裂力学、直书写3D打印传感器技术。E-mail:ypsnuaa@163.com;郭万林,男,1960年出生,博士,教授,中国科学院院士。主要研究方向为三维断裂力学、纳尺度物理力学。E-mail:wlguo@nuaa.edu.cn

Fatigue Crack Propagation of TC4ELI Titanium Alloy： Path Deflection and Life Enhancement Mechanism

YU Peishi^1,2,3, ZHAO Yuxiang^1,2,3, WU Liansheng^1,2,3, BIAN Jiakun^1,2,3, ZHAO Junhua^1,2,3, GUO Wanlin⁴

1. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, Wuxi 214122;
2. Jiangsu Engineering Research Center of Micro/Nano Additive/Subtractive Materials Manufacturing, Wuxi 214122;
3. School of Mechanical Engineering, Jiangnan University, Wuxi 214122;
4. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016

Received:2022-12-06 Revised:2023-03-16 Online:2023-08-20 Published:2023-11-15

摘要/Abstract

摘要： 作为深海载人装备结构的优选材料，TC4ELI (Extra-low-interstitial低间隙元素)钛合金的抗疲劳裂纹扩展性能至关重要。对TC4ELI的疲劳裂纹扩展行为进行系统测试与原位观测，同时选取传统TC4钛合金进行对比试验。结果显示，与TC4相比，TC4ELI具有更高的疲劳裂纹扩展寿命；同时，原位观察发现，TC4ELI的疲劳裂纹扩展存在明显偏折现象，导致裂纹路径比TC4更为曲折。进一步，综合利用微观表征手段对TC4ELI疲劳断口、材料组份、裂纹路径区域微结构进行系统的分析。在此基础上，利用有限元模拟计算裂纹扩展驱动力随偏折角度的变化规律，并分析裂纹偏折对TC4ELI疲劳扩展寿命的影响机理。研究对TC4ELI深海装备结构的损伤容限设计提供了参考。

关键词: TC4ELI钛合金, 深海装备, 疲劳裂纹, 路径偏折, 寿命提升

Abstract: As the optimal material for deep-sea manned equipment structure, TC4ELI(Extra-low-interstitial) titanium alloy's anti fatigue crack growth performance is crucial. In this work, the fatigue crack growth behavior of TC4ELI is systematically tested and observed in situ, and the traditional TC4 titanium alloy is selected for comparative experiments. The results show that TC4ELI has a higher fatigue crack growth life than TC4; At the same time, in situ observation found that the fatigue crack growth of TC4ELI is obviously deflected, resulting in a more tortuous crack path than TC4. Furthermore, TC4ELI fatigue fracture surface, material composition and microstructure of crack path region were systematically analyzed by means of microscopic characterization. On this basis, the variation of crack growth driving force with deflection angle is calculated by finite element simulation, and the influence mechanism of crack deflection on TC4ELI fatigue growth life is analyzed. This study provides a reference for the damage tolerance design of TC4ELI deep-sea equipment structure.

Key words: TC4ELI titanium alloy, deep-sea equipment, fatigue crack, path deflection, life enhancement

中图分类号:

TH114

于培师, 赵宇翔, 吴连生, 卞家坤, 赵军华, 郭万林. TC4ELI钛合金疲劳裂纹路径偏折与寿命提升机制[J]. 机械工程学报, 2023, 59(16): 72-81.

YU Peishi, ZHAO Yuxiang, WU Liansheng, BIAN Jiakun, ZHAO Junhua, GUO Wanlin. Fatigue Crack Propagation of TC4ELI Titanium Alloy： Path Deflection and Life Enhancement Mechanism[J]. Journal of Mechanical Engineering, 2023, 59(16): 72-81.

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TC4ELI钛合金疲劳裂纹路径偏折与寿命提升机制

Fatigue Crack Propagation of TC4ELI Titanium Alloy： Path Deflection and Life Enhancement Mechanism

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