Residual Fatigue Life Estimation of Damaged Welded Structures

Abstract:

This paper presents a finite element modeling procedure to determine of crack growth behaviour of butt welded joints under the subject of load for mode I. This paper presents a computation procedure to determine the ratio of fatigue crack growth in butt welded plates for mode I fracture mechanics loading conditions. The presence of residual stresses in welded structures can significantly affect the material’s resistance to fatigue under cyclic loading. The presence of tensile residual stresses adversely affects the fatigue crack growth rate increased it. Change of microstructure and hardening material as a result of the welding process also has a negative impact on the growth of the crack. Accurate prediction and reliable assessment of the residual stress are important for the structural integrity and residual life assessment of welded parts design. Although there are several techniques for the determination of residual stresses, the finite element method (FEM) is one of the most convenient and useful. This paper presents a finite element modeling procedure to determine of crack growth behaviour of butt welded joints under tensile load for mode I. Keywords: Welding, Residual stress, Residual life, Crack growth, FEM, Butt welded joint

• Periodical: Key Engineering Materials (Volume 990)
• Pages: 27-35
• DOI: https://doi.org/10.4028/p-z4sDEK
• Online since: October 2024
• Authors: Ivana Vasovic Maksimović*, Mirko Maksimović, Mirjana Djuric, Marko Ristic, Jelena Vidakovic
• Keywords: Butt Welded Joint, Crack Growth, FEM, Residual Life, Residual Stress, Welding

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