Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints
Constant-amplitude fatigue tests were conducted on overlap specimens of 7075/6061 aluminum alloy TIG fillet weldes. Subsequently, detailed finite element models were developed based on both the hot spot stress method and the critical distance method. The range of maximum principal stress variation w...
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| Format: | Article |
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Journal of Aeronautical Materials
2025-02-01
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| Series: | Journal of Aeronautical Materials |
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| Online Access: | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000019 |
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| author | LIAO Xiangyun WANG Ruijie LIU Guoshou ZHAO Pinglin CHANG Yaguang WANG Zhongde |
| author_facet | LIAO Xiangyun WANG Ruijie LIU Guoshou ZHAO Pinglin CHANG Yaguang WANG Zhongde |
| author_sort | LIAO Xiangyun |
| collection | DOAJ |
| description | Constant-amplitude fatigue tests were conducted on overlap specimens of 7075/6061 aluminum alloy TIG fillet weldes. Subsequently, detailed finite element models were developed based on both the hot spot stress method and the critical distance method. The range of maximum principal stress variation was from these models as a fatigue evaluation index for further analysis. By combining the results of finite element stress-strain analysis with the S-N curve recommended by the International Institute of Welding (IIW)，the fatigue lives of the weld joints under various loadings were estimated. Testing revealed that specimens primarily fractured at the weld toes on the 7075 side. The maximum stress-strain concentration points in the finite element model were located at the weld toe on the 7075 side, aligning closely with the actual fracture locations. By comparing the predicted fatigue lives with the actual test results，it was determined that the hot spot stress method can predict the fatigue life of TIG welds more accurately. After correcting for plate thickness, the prediction errors were within a factor of two in the low-cycle fatigue range. Both the point method and the line method within the critical distance method can predict hot spot stress, but the point method yields more precise results than the line method. |
| format | Article |
| id | doaj-art-ffb006ecafa449faa0488b71f55e9ab1 |
| institution | Kabale University |
| issn | 1005-5053 |
| language | zho |
| publishDate | 2025-02-01 |
| publisher | Journal of Aeronautical Materials |
| record_format | Article |
| series | Journal of Aeronautical Materials |
| spelling | doaj-art-ffb006ecafa449faa0488b71f55e9ab12025-02-12T09:22:41ZzhoJournal of Aeronautical MaterialsJournal of Aeronautical Materials1005-50532025-02-01451445210.11868/j.issn.1005-5053.2023.000019a2023-0019Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap jointsLIAO Xiangyun0WANG Ruijie1LIU Guoshou2ZHAO Pinglin3CHANG Yaguang4WANG Zhongde5Faculty of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650500，ChinaFaculty of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650500，ChinaSchool of Architectural Engineering，Kunming University of Science and Technology，Kunming 650500，ChinaFaculty of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650500，ChinaFaculty of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650500，ChinaFaculty of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650500，ChinaConstant-amplitude fatigue tests were conducted on overlap specimens of 7075/6061 aluminum alloy TIG fillet weldes. Subsequently, detailed finite element models were developed based on both the hot spot stress method and the critical distance method. The range of maximum principal stress variation was from these models as a fatigue evaluation index for further analysis. By combining the results of finite element stress-strain analysis with the S-N curve recommended by the International Institute of Welding (IIW)，the fatigue lives of the weld joints under various loadings were estimated. Testing revealed that specimens primarily fractured at the weld toes on the 7075 side. The maximum stress-strain concentration points in the finite element model were located at the weld toe on the 7075 side, aligning closely with the actual fracture locations. By comparing the predicted fatigue lives with the actual test results，it was determined that the hot spot stress method can predict the fatigue life of TIG welds more accurately. After correcting for plate thickness, the prediction errors were within a factor of two in the low-cycle fatigue range. Both the point method and the line method within the critical distance method can predict hot spot stress, but the point method yields more precise results than the line method.http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000019tig weldinghot spot stress methodcritical distance methodfatigue lifefinite element analysis |
| spellingShingle | LIAO Xiangyun WANG Ruijie LIU Guoshou ZHAO Pinglin CHANG Yaguang WANG Zhongde Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints Journal of Aeronautical Materials tig welding hot spot stress method critical distance method fatigue life finite element analysis |
| title | Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints |
| title_full | Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints |
| title_fullStr | Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints |
| title_full_unstemmed | Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints |
| title_short | Fatigue property evaluation of 7075/6061 aluminum alloy TIG welded overlap joints |
| title_sort | fatigue property evaluation of 7075 6061 aluminum alloy tig welded overlap joints |
| topic | tig welding hot spot stress method critical distance method fatigue life finite element analysis |
| url | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000019 |
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