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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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Aeronautical Materials
2025-02-01
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| Series: | Journal of Aeronautical Materials |
| Subjects: | |
| Online Access: | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000019 |
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| Summary: | 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. |
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| ISSN: | 1005-5053 |