The effect of residual stresses on fatigue of butt joints
- Univ. of Adelaide, South Australia (Australia). Dept. of Mechanical Engineering
In this paper, a theoretical analysis of the effect of residual stresses on the fatigue behavior of welded butt joints was developed by using linear elastic fracture mechanics (LEFM), superposition principle and finite element approaches. Various configurations of residual stresses in welded butt joints were considered and corresponding residual stress intensity factors were calculated by using Bueckner`s and Kanazawa`s weight functions for an edge and a central through-thickness crack in finite plate, respectively. Newman-Raju`s empirical equation was also used for surface cracks. Fatigue life of butt joint welds subjected to various stress-induced treatments was calculated by using Paris`s law with the effective range of stress intensity factor for zero-to-tensile loading (R = 0) and compared with the available experimental data. It was also found that the effect of a low level of compressive residual stress (less than 62 MPa) in terms of the fatigue strength improvement is of the same order as the effect of a postweld thermal stress relieving process. The contribution of hardness of the treated material to the improvement of fatigue life is obvious at a high level of compressive residual stresses.
- OSTI ID:
- 218537
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 2 Vol. 75; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
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