Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded joint
The crack growth in the structure shows the complex Ⅰ-Ⅱ mixed-mode under the combined tensile and shear fatigue loading. It is of great significance to understand its growth law for evaluating the fatigue life of structures accurately. In order to study the fatigue crack growth law of Ⅰ-Ⅱ mixed-mode...
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Journal of Aeronautical Materials
2020-04-01
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doaj-29afe1d717874a3e9bc5294ae292eabe2020-12-18T09:30:27ZzhoJournal of Aeronautical MaterialsJournal of Aeronautical Materials1005-50531005-50532020-04-01402616910.11868/j.issn.1005-5053.2018.000135a2018-0135Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded jointLIU Xiaogang0ZHU Xiaolin1GUO Haiding2Jiangsu Province Key Laboratory of Aerospace Power System, College of Power and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaJiangsu Province Key Laboratory of Aerospace Power System, College of Power and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaJiangsu Province Key Laboratory of Aerospace Power System, College of Power and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaThe crack growth in the structure shows the complex Ⅰ-Ⅱ mixed-mode under the combined tensile and shear fatigue loading. It is of great significance to understand its growth law for evaluating the fatigue life of structures accurately. In order to study the fatigue crack growth law of Ⅰ-Ⅱ mixed-mode welded joint of TC4-DT alloy, compact tension-shear (CTS) specimens were designed and machined, fatigue crack growth tests of welded joints under different loading angles were carried out, curves and fatigue crack growth paths of welded joints under Ⅰ-Ⅱ mixed-mode crack propagation were obtained. Based on the above situation, the equivalent stress intensity factor of Ⅰ-Ⅱ mixed-mode was introduced and the Paris law was employed to deduce the Ⅰ-Ⅱ mixed-mode crack growth rate equation of TC4-DT welded joint. In addition, the extended finite element method (XFEM) was adopted to simulate the fatigue crack growth progress of Ⅰ-Ⅱ mixed-mode crack, and the growth law under different loading modes were obtained and compared with test results. The research shows that the error values of the cracking angle under different loading modes are less than 10% compared simulation with experiment. What's more, the simulated growth paths are agree with the experimental results well. XFEM shows its advantages in simulating crack problems. XFEM can predict mixed-mode fatigue crack growth paths effectively.http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2018.000135tc4-dt titanium alloyⅰ-ⅱ mixed-mode fatigue crackcrack growth pathscts specimenextended finite element method |
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DOAJ |
language |
zho |
format |
Article |
sources |
DOAJ |
author |
LIU Xiaogang ZHU Xiaolin GUO Haiding |
spellingShingle |
LIU Xiaogang ZHU Xiaolin GUO Haiding Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded joint Journal of Aeronautical Materials tc4-dt titanium alloy ⅰ-ⅱ mixed-mode fatigue crack crack growth paths cts specimen extended finite element method |
author_facet |
LIU Xiaogang ZHU Xiaolin GUO Haiding |
author_sort |
LIU Xiaogang |
title |
Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded joint |
title_short |
Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded joint |
title_full |
Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded joint |
title_fullStr |
Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded joint |
title_full_unstemmed |
Experimental and simulation study on Ⅰ-Ⅱ mixed-mode fatigue crack growth of TC4-DT welded joint |
title_sort |
experimental and simulation study on ⅰ-ⅱ mixed-mode fatigue crack growth of tc4-dt welded joint |
publisher |
Journal of Aeronautical Materials |
series |
Journal of Aeronautical Materials |
issn |
1005-5053 1005-5053 |
publishDate |
2020-04-01 |
description |
The crack growth in the structure shows the complex Ⅰ-Ⅱ mixed-mode under the combined tensile and shear fatigue loading. It is of great significance to understand its growth law for evaluating the fatigue life of structures accurately. In order to study the fatigue crack growth law of Ⅰ-Ⅱ mixed-mode welded joint of TC4-DT alloy, compact tension-shear (CTS) specimens were designed and machined, fatigue crack growth tests of welded joints under different loading angles were carried out, curves and fatigue crack growth paths of welded joints under Ⅰ-Ⅱ mixed-mode crack propagation were obtained. Based on the above situation, the equivalent stress intensity factor of Ⅰ-Ⅱ mixed-mode was introduced and the Paris law was employed to deduce the Ⅰ-Ⅱ mixed-mode crack growth rate equation of TC4-DT welded joint. In addition, the extended finite element method (XFEM) was adopted to simulate the fatigue crack growth progress of Ⅰ-Ⅱ mixed-mode crack, and the growth law under different loading modes were obtained and compared with test results. The research shows that the error values of the cracking angle under different loading modes are less than 10% compared simulation with experiment. What's more, the simulated growth paths are agree with the experimental results well. XFEM shows its advantages in simulating crack problems. XFEM can predict mixed-mode fatigue crack growth paths effectively. |
topic |
tc4-dt titanium alloy ⅰ-ⅱ mixed-mode fatigue crack crack growth paths cts specimen extended finite element method |
url |
http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2018.000135 |
work_keys_str_mv |
AT liuxiaogang experimentalandsimulationstudyoniiimixedmodefatiguecrackgrowthoftc4dtweldedjoint AT zhuxiaolin experimentalandsimulationstudyoniiimixedmodefatiguecrackgrowthoftc4dtweldedjoint AT guohaiding experimentalandsimulationstudyoniiimixedmodefatiguecrackgrowthoftc4dtweldedjoint |
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1724378510061993984 |