Indian Welding Journal

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Analysis of Fatigue Design Recommendations for Aluminum Weldments with Imperfections


Affiliations
1 Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India
2 Inst. of Building Material and Construction, Sect. of Light Metal Structures and Fatigue, Technische Universitate Munchen, Germany
     

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The available fatigue data on weld imperfections regarding weld toe angle (WTA) and linear misalignment (LM) in the joints of Al-alloys reported by several workers has been mathematically and statistically analyzed to derive the sets of fatigue design curves for quantitative comparison with those recommended by the Eurocode. It is envisaged that as reference the newly derived design curves can assist in designing under dynamic loading with better understanding of the recommendations compared to the design curves of recommended standards. Further, for the defects like lack of penetration (LOP) and lack of fusion (LOF) the validity and shortcomings of the recommended limits of imperfection of Euronorm are evaluated with respect to the analysis put forward by the newly derived design curves. The critical analysis has proposed certain more preferable logical recommendations on economically acceptable limits of weld defects especially for the high cost intensive structures at high cycle range of 5 ×105 to 5 ×106, which should be verified further with more experimental data in this area prior to its practical implementation.


Keywords

Design Recommendations, Fusion Welded Joints, S-N Curves, Aluminum Alloys, Weld Toe Angle, Linear Misalignment, Lack of Penetration, Lack of Fusion, Imperfection Limits.
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  • Analysis of Fatigue Design Recommendations for Aluminum Weldments with Imperfections

Abstract Views: 320  |  PDF Views: 5

Authors

Y. U. Pardhi
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India
P. K. Ghosh
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India
D. Kosteas
Inst. of Building Material and Construction, Sect. of Light Metal Structures and Fatigue, Technische Universitate Munchen, Germany

Abstract


The available fatigue data on weld imperfections regarding weld toe angle (WTA) and linear misalignment (LM) in the joints of Al-alloys reported by several workers has been mathematically and statistically analyzed to derive the sets of fatigue design curves for quantitative comparison with those recommended by the Eurocode. It is envisaged that as reference the newly derived design curves can assist in designing under dynamic loading with better understanding of the recommendations compared to the design curves of recommended standards. Further, for the defects like lack of penetration (LOP) and lack of fusion (LOF) the validity and shortcomings of the recommended limits of imperfection of Euronorm are evaluated with respect to the analysis put forward by the newly derived design curves. The critical analysis has proposed certain more preferable logical recommendations on economically acceptable limits of weld defects especially for the high cost intensive structures at high cycle range of 5 ×105 to 5 ×106, which should be verified further with more experimental data in this area prior to its practical implementation.


Keywords


Design Recommendations, Fusion Welded Joints, S-N Curves, Aluminum Alloys, Weld Toe Angle, Linear Misalignment, Lack of Penetration, Lack of Fusion, Imperfection Limits.